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/*
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* Copyright (C) 2010 Citrix Ltd.
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include <sys/mman.h> |
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#include "hw/pci/pci.h" |
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#include "hw/i386/pc.h" |
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#include "hw/xen/xen_common.h" |
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#include "hw/xen/xen_backend.h" |
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#include "qmp-commands.h" |
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#include "sysemu/char.h" |
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#include "qemu/range.h" |
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#include "sysemu/xen-mapcache.h" |
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#include "trace.h" |
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#include "exec/address-spaces.h" |
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#include <xen/hvm/ioreq.h> |
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#include <xen/hvm/params.h> |
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#include <xen/hvm/e820.h> |
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//#define DEBUG_XEN
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#ifdef DEBUG_XEN
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#define DPRINTF(fmt, ...) \
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do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0) |
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#endif
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static MemoryRegion ram_memory, ram_640k, ram_lo, ram_hi;
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static MemoryRegion *framebuffer;
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static bool xen_in_migration; |
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/* Compatibility with older version */
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#if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a |
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static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i) |
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{ |
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return shared_page->vcpu_iodata[i].vp_eport;
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} |
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static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu) |
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{ |
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return &shared_page->vcpu_iodata[vcpu].vp_ioreq;
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} |
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# define FMT_ioreq_size PRIx64
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#else
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static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i) |
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{ |
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return shared_page->vcpu_ioreq[i].vp_eport;
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} |
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static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu) |
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{ |
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return &shared_page->vcpu_ioreq[vcpu];
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} |
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# define FMT_ioreq_size "u" |
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#endif
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#ifndef HVM_PARAM_BUFIOREQ_EVTCHN
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#define HVM_PARAM_BUFIOREQ_EVTCHN 26 |
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#endif
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#define BUFFER_IO_MAX_DELAY 100 |
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typedef struct XenPhysmap { |
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hwaddr start_addr; |
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ram_addr_t size; |
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char *name;
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hwaddr phys_offset; |
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QLIST_ENTRY(XenPhysmap) list; |
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} XenPhysmap; |
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typedef struct XenIOState { |
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shared_iopage_t *shared_page; |
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buffered_iopage_t *buffered_io_page; |
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QEMUTimer *buffered_io_timer; |
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/* the evtchn port for polling the notification, */
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evtchn_port_t *ioreq_local_port; |
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/* evtchn local port for buffered io */
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evtchn_port_t bufioreq_local_port; |
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/* the evtchn fd for polling */
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XenEvtchn xce_handle; |
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/* which vcpu we are serving */
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int send_vcpu;
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struct xs_handle *xenstore;
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MemoryListener memory_listener; |
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QLIST_HEAD(, XenPhysmap) physmap; |
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hwaddr free_phys_offset; |
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const XenPhysmap *log_for_dirtybit;
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Notifier exit; |
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Notifier suspend; |
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} XenIOState; |
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|
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/* Xen specific function for piix pci */
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int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num) |
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{ |
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return irq_num + ((pci_dev->devfn >> 3) << 2); |
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} |
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void xen_piix3_set_irq(void *opaque, int irq_num, int level) |
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{ |
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xc_hvm_set_pci_intx_level(xen_xc, xen_domid, 0, 0, irq_num >> 2, |
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irq_num & 3, level);
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} |
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void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len) |
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{ |
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int i;
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/* Scan for updates to PCI link routes (0x60-0x63). */
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for (i = 0; i < len; i++) { |
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uint8_t v = (val >> (8 * i)) & 0xff; |
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if (v & 0x80) { |
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v = 0;
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} |
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v &= 0xf;
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if (((address + i) >= 0x60) && ((address + i) <= 0x63)) { |
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xc_hvm_set_pci_link_route(xen_xc, xen_domid, address + i - 0x60, v);
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} |
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} |
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} |
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void xen_hvm_inject_msi(uint64_t addr, uint32_t data)
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{ |
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xen_xc_hvm_inject_msi(xen_xc, xen_domid, addr, data); |
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} |
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static void xen_suspend_notifier(Notifier *notifier, void *data) |
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{ |
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xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 3);
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} |
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/* Xen Interrupt Controller */
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static void xen_set_irq(void *opaque, int irq, int level) |
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{ |
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xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level); |
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} |
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qemu_irq *xen_interrupt_controller_init(void)
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{ |
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return qemu_allocate_irqs(xen_set_irq, NULL, 16); |
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} |
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/* Memory Ops */
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static void xen_ram_init(ram_addr_t ram_size) |
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{ |
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MemoryRegion *sysmem = get_system_memory(); |
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ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
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ram_addr_t block_len; |
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block_len = ram_size; |
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if (ram_size >= QEMU_BELOW_4G_RAM_END) {
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/* Xen does not allocate the memory continuously, and keep a hole at
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* QEMU_BELOW_4G_RAM_END of QEMU_BELOW_4G_MMIO_LENGTH
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*/
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block_len += QEMU_BELOW_4G_MMIO_LENGTH; |
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} |
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memory_region_init_ram(&ram_memory, "xen.ram", block_len);
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vmstate_register_ram_global(&ram_memory); |
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if (ram_size >= QEMU_BELOW_4G_RAM_END) {
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above_4g_mem_size = ram_size - QEMU_BELOW_4G_RAM_END; |
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below_4g_mem_size = QEMU_BELOW_4G_RAM_END; |
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} else {
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below_4g_mem_size = ram_size; |
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} |
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memory_region_init_alias(&ram_640k, "xen.ram.640k",
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&ram_memory, 0, 0xa0000); |
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memory_region_add_subregion(sysmem, 0, &ram_640k);
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/* Skip of the VGA IO memory space, it will be registered later by the VGA
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* emulated device.
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*
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* The area between 0xc0000 and 0x100000 will be used by SeaBIOS to load
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* the Options ROM, so it is registered here as RAM.
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*/
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memory_region_init_alias(&ram_lo, "xen.ram.lo",
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&ram_memory, 0xc0000, below_4g_mem_size - 0xc0000); |
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memory_region_add_subregion(sysmem, 0xc0000, &ram_lo);
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if (above_4g_mem_size > 0) { |
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memory_region_init_alias(&ram_hi, "xen.ram.hi",
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&ram_memory, 0x100000000ULL,
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above_4g_mem_size); |
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memory_region_add_subregion(sysmem, 0x100000000ULL, &ram_hi);
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} |
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} |
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void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
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{ |
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unsigned long nr_pfn; |
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xen_pfn_t *pfn_list; |
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int i;
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if (runstate_check(RUN_STATE_INMIGRATE)) {
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/* RAM already populated in Xen */
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fprintf(stderr, "%s: do not alloc "RAM_ADDR_FMT
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" bytes of ram at "RAM_ADDR_FMT" when runstate is INMIGRATE\n", |
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__func__, size, ram_addr); |
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return;
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} |
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if (mr == &ram_memory) {
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return;
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} |
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trace_xen_ram_alloc(ram_addr, size); |
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nr_pfn = size >> TARGET_PAGE_BITS; |
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pfn_list = g_malloc(sizeof (*pfn_list) * nr_pfn);
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for (i = 0; i < nr_pfn; i++) { |
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pfn_list[i] = (ram_addr >> TARGET_PAGE_BITS) + i; |
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} |
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if (xc_domain_populate_physmap_exact(xen_xc, xen_domid, nr_pfn, 0, 0, pfn_list)) { |
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hw_error("xen: failed to populate ram at " RAM_ADDR_FMT, ram_addr);
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} |
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g_free(pfn_list); |
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} |
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static XenPhysmap *get_physmapping(XenIOState *state,
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hwaddr start_addr, ram_addr_t size) |
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{ |
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XenPhysmap *physmap = NULL;
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start_addr &= TARGET_PAGE_MASK; |
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QLIST_FOREACH(physmap, &state->physmap, list) { |
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if (range_covers_byte(physmap->start_addr, physmap->size, start_addr)) {
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return physmap;
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} |
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} |
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return NULL; |
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} |
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static hwaddr xen_phys_offset_to_gaddr(hwaddr start_addr,
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ram_addr_t size, void *opaque)
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{ |
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hwaddr addr = start_addr & TARGET_PAGE_MASK; |
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XenIOState *xen_io_state = opaque; |
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XenPhysmap *physmap = NULL;
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QLIST_FOREACH(physmap, &xen_io_state->physmap, list) { |
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if (range_covers_byte(physmap->phys_offset, physmap->size, addr)) {
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return physmap->start_addr;
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} |
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} |
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return start_addr;
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} |
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#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340 |
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static int xen_add_to_physmap(XenIOState *state, |
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hwaddr start_addr, |
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ram_addr_t size, |
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MemoryRegion *mr, |
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hwaddr offset_within_region) |
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{ |
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unsigned long i = 0; |
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int rc = 0; |
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XenPhysmap *physmap = NULL;
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hwaddr pfn, start_gpfn; |
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hwaddr phys_offset = memory_region_get_ram_addr(mr); |
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char path[80], value[17]; |
278 |
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if (get_physmapping(state, start_addr, size)) {
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return 0; |
281 |
} |
282 |
if (size <= 0) { |
283 |
return -1; |
284 |
} |
285 |
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/* Xen can only handle a single dirty log region for now and we want
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* the linear framebuffer to be that region.
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* Avoid tracking any regions that is not videoram and avoid tracking
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* the legacy vga region. */
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if (mr == framebuffer && start_addr > 0xbffff) { |
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goto go_physmap;
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} |
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return -1; |
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go_physmap:
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DPRINTF("mapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx"\n", |
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start_addr, start_addr + size); |
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pfn = phys_offset >> TARGET_PAGE_BITS; |
300 |
start_gpfn = start_addr >> TARGET_PAGE_BITS; |
301 |
for (i = 0; i < size >> TARGET_PAGE_BITS; i++) { |
302 |
unsigned long idx = pfn + i; |
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xen_pfn_t gpfn = start_gpfn + i; |
304 |
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rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn); |
306 |
if (rc) {
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307 |
DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %" |
308 |
PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
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return -rc;
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} |
311 |
} |
312 |
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physmap = g_malloc(sizeof (XenPhysmap));
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314 |
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physmap->start_addr = start_addr; |
316 |
physmap->size = size; |
317 |
physmap->name = (char *)mr->name;
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physmap->phys_offset = phys_offset; |
319 |
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320 |
QLIST_INSERT_HEAD(&state->physmap, physmap, list); |
321 |
|
322 |
xc_domain_pin_memory_cacheattr(xen_xc, xen_domid, |
323 |
start_addr >> TARGET_PAGE_BITS, |
324 |
(start_addr + size) >> TARGET_PAGE_BITS, |
325 |
XEN_DOMCTL_MEM_CACHEATTR_WB); |
326 |
|
327 |
snprintf(path, sizeof(path),
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328 |
"/local/domain/0/device-model/%d/physmap/%"PRIx64"/start_addr", |
329 |
xen_domid, (uint64_t)phys_offset); |
330 |
snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)start_addr); |
331 |
if (!xs_write(state->xenstore, 0, path, value, strlen(value))) { |
332 |
return -1; |
333 |
} |
334 |
snprintf(path, sizeof(path),
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335 |
"/local/domain/0/device-model/%d/physmap/%"PRIx64"/size", |
336 |
xen_domid, (uint64_t)phys_offset); |
337 |
snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)size); |
338 |
if (!xs_write(state->xenstore, 0, path, value, strlen(value))) { |
339 |
return -1; |
340 |
} |
341 |
if (mr->name) {
|
342 |
snprintf(path, sizeof(path),
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343 |
"/local/domain/0/device-model/%d/physmap/%"PRIx64"/name", |
344 |
xen_domid, (uint64_t)phys_offset); |
345 |
if (!xs_write(state->xenstore, 0, path, mr->name, strlen(mr->name))) { |
346 |
return -1; |
347 |
} |
348 |
} |
349 |
|
350 |
return 0; |
351 |
} |
352 |
|
353 |
static int xen_remove_from_physmap(XenIOState *state, |
354 |
hwaddr start_addr, |
355 |
ram_addr_t size) |
356 |
{ |
357 |
unsigned long i = 0; |
358 |
int rc = 0; |
359 |
XenPhysmap *physmap = NULL;
|
360 |
hwaddr phys_offset = 0;
|
361 |
|
362 |
physmap = get_physmapping(state, start_addr, size); |
363 |
if (physmap == NULL) { |
364 |
return -1; |
365 |
} |
366 |
|
367 |
phys_offset = physmap->phys_offset; |
368 |
size = physmap->size; |
369 |
|
370 |
DPRINTF("unmapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx", from ", |
371 |
"%"HWADDR_PRIx"\n", phys_offset, phys_offset + size, start_addr); |
372 |
|
373 |
size >>= TARGET_PAGE_BITS; |
374 |
start_addr >>= TARGET_PAGE_BITS; |
375 |
phys_offset >>= TARGET_PAGE_BITS; |
376 |
for (i = 0; i < size; i++) { |
377 |
unsigned long idx = start_addr + i; |
378 |
xen_pfn_t gpfn = phys_offset + i; |
379 |
|
380 |
rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn); |
381 |
if (rc) {
|
382 |
fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %" |
383 |
PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
|
384 |
return -rc;
|
385 |
} |
386 |
} |
387 |
|
388 |
QLIST_REMOVE(physmap, list); |
389 |
if (state->log_for_dirtybit == physmap) {
|
390 |
state->log_for_dirtybit = NULL;
|
391 |
} |
392 |
g_free(physmap); |
393 |
|
394 |
return 0; |
395 |
} |
396 |
|
397 |
#else
|
398 |
static int xen_add_to_physmap(XenIOState *state, |
399 |
hwaddr start_addr, |
400 |
ram_addr_t size, |
401 |
MemoryRegion *mr, |
402 |
hwaddr offset_within_region) |
403 |
{ |
404 |
return -ENOSYS;
|
405 |
} |
406 |
|
407 |
static int xen_remove_from_physmap(XenIOState *state, |
408 |
hwaddr start_addr, |
409 |
ram_addr_t size) |
410 |
{ |
411 |
return -ENOSYS;
|
412 |
} |
413 |
#endif
|
414 |
|
415 |
static void xen_set_memory(struct MemoryListener *listener, |
416 |
MemoryRegionSection *section, |
417 |
bool add)
|
418 |
{ |
419 |
XenIOState *state = container_of(listener, XenIOState, memory_listener); |
420 |
hwaddr start_addr = section->offset_within_address_space; |
421 |
ram_addr_t size = int128_get64(section->size); |
422 |
bool log_dirty = memory_region_is_logging(section->mr);
|
423 |
hvmmem_type_t mem_type; |
424 |
|
425 |
if (!memory_region_is_ram(section->mr)) {
|
426 |
return;
|
427 |
} |
428 |
|
429 |
if (!(section->mr != &ram_memory
|
430 |
&& ( (log_dirty && add) || (!log_dirty && !add)))) { |
431 |
return;
|
432 |
} |
433 |
|
434 |
trace_xen_client_set_memory(start_addr, size, log_dirty); |
435 |
|
436 |
start_addr &= TARGET_PAGE_MASK; |
437 |
size = TARGET_PAGE_ALIGN(size); |
438 |
|
439 |
if (add) {
|
440 |
if (!memory_region_is_rom(section->mr)) {
|
441 |
xen_add_to_physmap(state, start_addr, size, |
442 |
section->mr, section->offset_within_region); |
443 |
} else {
|
444 |
mem_type = HVMMEM_ram_ro; |
445 |
if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type,
|
446 |
start_addr >> TARGET_PAGE_BITS, |
447 |
size >> TARGET_PAGE_BITS)) { |
448 |
DPRINTF("xc_hvm_set_mem_type error, addr: "TARGET_FMT_plx"\n", |
449 |
start_addr); |
450 |
} |
451 |
} |
452 |
} else {
|
453 |
if (xen_remove_from_physmap(state, start_addr, size) < 0) { |
454 |
DPRINTF("physmapping does not exist at "TARGET_FMT_plx"\n", start_addr); |
455 |
} |
456 |
} |
457 |
} |
458 |
|
459 |
static void xen_region_add(MemoryListener *listener, |
460 |
MemoryRegionSection *section) |
461 |
{ |
462 |
xen_set_memory(listener, section, true);
|
463 |
} |
464 |
|
465 |
static void xen_region_del(MemoryListener *listener, |
466 |
MemoryRegionSection *section) |
467 |
{ |
468 |
xen_set_memory(listener, section, false);
|
469 |
} |
470 |
|
471 |
static void xen_sync_dirty_bitmap(XenIOState *state, |
472 |
hwaddr start_addr, |
473 |
ram_addr_t size) |
474 |
{ |
475 |
hwaddr npages = size >> TARGET_PAGE_BITS; |
476 |
const int width = sizeof(unsigned long) * 8; |
477 |
unsigned long bitmap[(npages + width - 1) / width]; |
478 |
int rc, i, j;
|
479 |
const XenPhysmap *physmap = NULL; |
480 |
|
481 |
physmap = get_physmapping(state, start_addr, size); |
482 |
if (physmap == NULL) { |
483 |
/* not handled */
|
484 |
return;
|
485 |
} |
486 |
|
487 |
if (state->log_for_dirtybit == NULL) { |
488 |
state->log_for_dirtybit = physmap; |
489 |
} else if (state->log_for_dirtybit != physmap) { |
490 |
/* Only one range for dirty bitmap can be tracked. */
|
491 |
return;
|
492 |
} |
493 |
|
494 |
rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid, |
495 |
start_addr >> TARGET_PAGE_BITS, npages, |
496 |
bitmap); |
497 |
if (rc < 0) { |
498 |
if (rc != -ENODATA) {
|
499 |
memory_region_set_dirty(framebuffer, 0, size);
|
500 |
DPRINTF("xen: track_dirty_vram failed (0x" TARGET_FMT_plx
|
501 |
", 0x" TARGET_FMT_plx "): %s\n", |
502 |
start_addr, start_addr + size, strerror(-rc)); |
503 |
} |
504 |
return;
|
505 |
} |
506 |
|
507 |
for (i = 0; i < ARRAY_SIZE(bitmap); i++) { |
508 |
unsigned long map = bitmap[i]; |
509 |
while (map != 0) { |
510 |
j = ffsl(map) - 1;
|
511 |
map &= ~(1ul << j);
|
512 |
memory_region_set_dirty(framebuffer, |
513 |
(i * width + j) * TARGET_PAGE_SIZE, |
514 |
TARGET_PAGE_SIZE); |
515 |
}; |
516 |
} |
517 |
} |
518 |
|
519 |
static void xen_log_start(MemoryListener *listener, |
520 |
MemoryRegionSection *section) |
521 |
{ |
522 |
XenIOState *state = container_of(listener, XenIOState, memory_listener); |
523 |
|
524 |
xen_sync_dirty_bitmap(state, section->offset_within_address_space, |
525 |
int128_get64(section->size)); |
526 |
} |
527 |
|
528 |
static void xen_log_stop(MemoryListener *listener, MemoryRegionSection *section) |
529 |
{ |
530 |
XenIOState *state = container_of(listener, XenIOState, memory_listener); |
531 |
|
532 |
state->log_for_dirtybit = NULL;
|
533 |
/* Disable dirty bit tracking */
|
534 |
xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL); |
535 |
} |
536 |
|
537 |
static void xen_log_sync(MemoryListener *listener, MemoryRegionSection *section) |
538 |
{ |
539 |
XenIOState *state = container_of(listener, XenIOState, memory_listener); |
540 |
|
541 |
xen_sync_dirty_bitmap(state, section->offset_within_address_space, |
542 |
int128_get64(section->size)); |
543 |
} |
544 |
|
545 |
static void xen_log_global_start(MemoryListener *listener) |
546 |
{ |
547 |
if (xen_enabled()) {
|
548 |
xen_in_migration = true;
|
549 |
} |
550 |
} |
551 |
|
552 |
static void xen_log_global_stop(MemoryListener *listener) |
553 |
{ |
554 |
xen_in_migration = false;
|
555 |
} |
556 |
|
557 |
static MemoryListener xen_memory_listener = {
|
558 |
.region_add = xen_region_add, |
559 |
.region_del = xen_region_del, |
560 |
.log_start = xen_log_start, |
561 |
.log_stop = xen_log_stop, |
562 |
.log_sync = xen_log_sync, |
563 |
.log_global_start = xen_log_global_start, |
564 |
.log_global_stop = xen_log_global_stop, |
565 |
.priority = 10,
|
566 |
}; |
567 |
|
568 |
void qmp_xen_set_global_dirty_log(bool enable, Error **errp) |
569 |
{ |
570 |
if (enable) {
|
571 |
memory_global_dirty_log_start(); |
572 |
} else {
|
573 |
memory_global_dirty_log_stop(); |
574 |
} |
575 |
} |
576 |
|
577 |
/* get the ioreq packets from share mem */
|
578 |
static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu) |
579 |
{ |
580 |
ioreq_t *req = xen_vcpu_ioreq(state->shared_page, vcpu); |
581 |
|
582 |
if (req->state != STATE_IOREQ_READY) {
|
583 |
DPRINTF("I/O request not ready: "
|
584 |
"%x, ptr: %x, port: %"PRIx64", " |
585 |
"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n", |
586 |
req->state, req->data_is_ptr, req->addr, |
587 |
req->data, req->count, req->size); |
588 |
return NULL; |
589 |
} |
590 |
|
591 |
xen_rmb(); /* see IOREQ_READY /then/ read contents of ioreq */
|
592 |
|
593 |
req->state = STATE_IOREQ_INPROCESS; |
594 |
return req;
|
595 |
} |
596 |
|
597 |
/* use poll to get the port notification */
|
598 |
/* ioreq_vec--out,the */
|
599 |
/* retval--the number of ioreq packet */
|
600 |
static ioreq_t *cpu_get_ioreq(XenIOState *state)
|
601 |
{ |
602 |
int i;
|
603 |
evtchn_port_t port; |
604 |
|
605 |
port = xc_evtchn_pending(state->xce_handle); |
606 |
if (port == state->bufioreq_local_port) {
|
607 |
qemu_mod_timer(state->buffered_io_timer, |
608 |
BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock)); |
609 |
return NULL; |
610 |
} |
611 |
|
612 |
if (port != -1) { |
613 |
for (i = 0; i < smp_cpus; i++) { |
614 |
if (state->ioreq_local_port[i] == port) {
|
615 |
break;
|
616 |
} |
617 |
} |
618 |
|
619 |
if (i == smp_cpus) {
|
620 |
hw_error("Fatal error while trying to get io event!\n");
|
621 |
} |
622 |
|
623 |
/* unmask the wanted port again */
|
624 |
xc_evtchn_unmask(state->xce_handle, port); |
625 |
|
626 |
/* get the io packet from shared memory */
|
627 |
state->send_vcpu = i; |
628 |
return cpu_get_ioreq_from_shared_memory(state, i);
|
629 |
} |
630 |
|
631 |
/* read error or read nothing */
|
632 |
return NULL; |
633 |
} |
634 |
|
635 |
static uint32_t do_inp(pio_addr_t addr, unsigned long size) |
636 |
{ |
637 |
switch (size) {
|
638 |
case 1: |
639 |
return cpu_inb(addr);
|
640 |
case 2: |
641 |
return cpu_inw(addr);
|
642 |
case 4: |
643 |
return cpu_inl(addr);
|
644 |
default:
|
645 |
hw_error("inp: bad size: %04"FMT_pioaddr" %lx", addr, size); |
646 |
} |
647 |
} |
648 |
|
649 |
static void do_outp(pio_addr_t addr, |
650 |
unsigned long size, uint32_t val) |
651 |
{ |
652 |
switch (size) {
|
653 |
case 1: |
654 |
return cpu_outb(addr, val);
|
655 |
case 2: |
656 |
return cpu_outw(addr, val);
|
657 |
case 4: |
658 |
return cpu_outl(addr, val);
|
659 |
default:
|
660 |
hw_error("outp: bad size: %04"FMT_pioaddr" %lx", addr, size); |
661 |
} |
662 |
} |
663 |
|
664 |
/*
|
665 |
* Helper functions which read/write an object from/to physical guest
|
666 |
* memory, as part of the implementation of an ioreq.
|
667 |
*
|
668 |
* Equivalent to
|
669 |
* cpu_physical_memory_rw(addr + (req->df ? -1 : +1) * req->size * i,
|
670 |
* val, req->size, 0/1)
|
671 |
* except without the integer overflow problems.
|
672 |
*/
|
673 |
static void rw_phys_req_item(hwaddr addr, |
674 |
ioreq_t *req, uint32_t i, void *val, int rw) |
675 |
{ |
676 |
/* Do everything unsigned so overflow just results in a truncated result
|
677 |
* and accesses to undesired parts of guest memory, which is up
|
678 |
* to the guest */
|
679 |
hwaddr offset = (hwaddr)req->size * i; |
680 |
if (req->df) {
|
681 |
addr -= offset; |
682 |
} else {
|
683 |
addr += offset; |
684 |
} |
685 |
cpu_physical_memory_rw(addr, val, req->size, rw); |
686 |
} |
687 |
|
688 |
static inline void read_phys_req_item(hwaddr addr, |
689 |
ioreq_t *req, uint32_t i, void *val)
|
690 |
{ |
691 |
rw_phys_req_item(addr, req, i, val, 0);
|
692 |
} |
693 |
static inline void write_phys_req_item(hwaddr addr, |
694 |
ioreq_t *req, uint32_t i, void *val)
|
695 |
{ |
696 |
rw_phys_req_item(addr, req, i, val, 1);
|
697 |
} |
698 |
|
699 |
|
700 |
static void cpu_ioreq_pio(ioreq_t *req) |
701 |
{ |
702 |
uint32_t i; |
703 |
|
704 |
if (req->dir == IOREQ_READ) {
|
705 |
if (!req->data_is_ptr) {
|
706 |
req->data = do_inp(req->addr, req->size); |
707 |
} else {
|
708 |
uint32_t tmp; |
709 |
|
710 |
for (i = 0; i < req->count; i++) { |
711 |
tmp = do_inp(req->addr, req->size); |
712 |
write_phys_req_item(req->data, req, i, &tmp); |
713 |
} |
714 |
} |
715 |
} else if (req->dir == IOREQ_WRITE) { |
716 |
if (!req->data_is_ptr) {
|
717 |
do_outp(req->addr, req->size, req->data); |
718 |
} else {
|
719 |
for (i = 0; i < req->count; i++) { |
720 |
uint32_t tmp = 0;
|
721 |
|
722 |
read_phys_req_item(req->data, req, i, &tmp); |
723 |
do_outp(req->addr, req->size, tmp); |
724 |
} |
725 |
} |
726 |
} |
727 |
} |
728 |
|
729 |
static void cpu_ioreq_move(ioreq_t *req) |
730 |
{ |
731 |
uint32_t i; |
732 |
|
733 |
if (!req->data_is_ptr) {
|
734 |
if (req->dir == IOREQ_READ) {
|
735 |
for (i = 0; i < req->count; i++) { |
736 |
read_phys_req_item(req->addr, req, i, &req->data); |
737 |
} |
738 |
} else if (req->dir == IOREQ_WRITE) { |
739 |
for (i = 0; i < req->count; i++) { |
740 |
write_phys_req_item(req->addr, req, i, &req->data); |
741 |
} |
742 |
} |
743 |
} else {
|
744 |
uint64_t tmp; |
745 |
|
746 |
if (req->dir == IOREQ_READ) {
|
747 |
for (i = 0; i < req->count; i++) { |
748 |
read_phys_req_item(req->addr, req, i, &tmp); |
749 |
write_phys_req_item(req->data, req, i, &tmp); |
750 |
} |
751 |
} else if (req->dir == IOREQ_WRITE) { |
752 |
for (i = 0; i < req->count; i++) { |
753 |
read_phys_req_item(req->data, req, i, &tmp); |
754 |
write_phys_req_item(req->addr, req, i, &tmp); |
755 |
} |
756 |
} |
757 |
} |
758 |
} |
759 |
|
760 |
static void handle_ioreq(ioreq_t *req) |
761 |
{ |
762 |
if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
|
763 |
(req->size < sizeof (target_ulong))) {
|
764 |
req->data &= ((target_ulong) 1 << (8 * req->size)) - 1; |
765 |
} |
766 |
|
767 |
switch (req->type) {
|
768 |
case IOREQ_TYPE_PIO:
|
769 |
cpu_ioreq_pio(req); |
770 |
break;
|
771 |
case IOREQ_TYPE_COPY:
|
772 |
cpu_ioreq_move(req); |
773 |
break;
|
774 |
case IOREQ_TYPE_TIMEOFFSET:
|
775 |
break;
|
776 |
case IOREQ_TYPE_INVALIDATE:
|
777 |
xen_invalidate_map_cache(); |
778 |
break;
|
779 |
default:
|
780 |
hw_error("Invalid ioreq type 0x%x\n", req->type);
|
781 |
} |
782 |
} |
783 |
|
784 |
static int handle_buffered_iopage(XenIOState *state) |
785 |
{ |
786 |
buf_ioreq_t *buf_req = NULL;
|
787 |
ioreq_t req; |
788 |
int qw;
|
789 |
|
790 |
if (!state->buffered_io_page) {
|
791 |
return 0; |
792 |
} |
793 |
|
794 |
memset(&req, 0x00, sizeof(req)); |
795 |
|
796 |
while (state->buffered_io_page->read_pointer != state->buffered_io_page->write_pointer) {
|
797 |
buf_req = &state->buffered_io_page->buf_ioreq[ |
798 |
state->buffered_io_page->read_pointer % IOREQ_BUFFER_SLOT_NUM]; |
799 |
req.size = 1UL << buf_req->size;
|
800 |
req.count = 1;
|
801 |
req.addr = buf_req->addr; |
802 |
req.data = buf_req->data; |
803 |
req.state = STATE_IOREQ_READY; |
804 |
req.dir = buf_req->dir; |
805 |
req.df = 1;
|
806 |
req.type = buf_req->type; |
807 |
req.data_is_ptr = 0;
|
808 |
qw = (req.size == 8);
|
809 |
if (qw) {
|
810 |
buf_req = &state->buffered_io_page->buf_ioreq[ |
811 |
(state->buffered_io_page->read_pointer + 1) % IOREQ_BUFFER_SLOT_NUM];
|
812 |
req.data |= ((uint64_t)buf_req->data) << 32;
|
813 |
} |
814 |
|
815 |
handle_ioreq(&req); |
816 |
|
817 |
xen_mb(); |
818 |
state->buffered_io_page->read_pointer += qw ? 2 : 1; |
819 |
} |
820 |
|
821 |
return req.count;
|
822 |
} |
823 |
|
824 |
static void handle_buffered_io(void *opaque) |
825 |
{ |
826 |
XenIOState *state = opaque; |
827 |
|
828 |
if (handle_buffered_iopage(state)) {
|
829 |
qemu_mod_timer(state->buffered_io_timer, |
830 |
BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock)); |
831 |
} else {
|
832 |
qemu_del_timer(state->buffered_io_timer); |
833 |
xc_evtchn_unmask(state->xce_handle, state->bufioreq_local_port); |
834 |
} |
835 |
} |
836 |
|
837 |
static void cpu_handle_ioreq(void *opaque) |
838 |
{ |
839 |
XenIOState *state = opaque; |
840 |
ioreq_t *req = cpu_get_ioreq(state); |
841 |
|
842 |
handle_buffered_iopage(state); |
843 |
if (req) {
|
844 |
handle_ioreq(req); |
845 |
|
846 |
if (req->state != STATE_IOREQ_INPROCESS) {
|
847 |
fprintf(stderr, "Badness in I/O request ... not in service?!: "
|
848 |
"%x, ptr: %x, port: %"PRIx64", " |
849 |
"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n", |
850 |
req->state, req->data_is_ptr, req->addr, |
851 |
req->data, req->count, req->size); |
852 |
destroy_hvm_domain(false);
|
853 |
return;
|
854 |
} |
855 |
|
856 |
xen_wmb(); /* Update ioreq contents /then/ update state. */
|
857 |
|
858 |
/*
|
859 |
* We do this before we send the response so that the tools
|
860 |
* have the opportunity to pick up on the reset before the
|
861 |
* guest resumes and does a hlt with interrupts disabled which
|
862 |
* causes Xen to powerdown the domain.
|
863 |
*/
|
864 |
if (runstate_is_running()) {
|
865 |
if (qemu_shutdown_requested_get()) {
|
866 |
destroy_hvm_domain(false);
|
867 |
} |
868 |
if (qemu_reset_requested_get()) {
|
869 |
qemu_system_reset(VMRESET_REPORT); |
870 |
destroy_hvm_domain(true);
|
871 |
} |
872 |
} |
873 |
|
874 |
req->state = STATE_IORESP_READY; |
875 |
xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]); |
876 |
} |
877 |
} |
878 |
|
879 |
static int store_dev_info(int domid, CharDriverState *cs, const char *string) |
880 |
{ |
881 |
struct xs_handle *xs = NULL; |
882 |
char *path = NULL; |
883 |
char *newpath = NULL; |
884 |
char *pts = NULL; |
885 |
int ret = -1; |
886 |
|
887 |
/* Only continue if we're talking to a pty. */
|
888 |
if (strncmp(cs->filename, "pty:", 4)) { |
889 |
return 0; |
890 |
} |
891 |
pts = cs->filename + 4;
|
892 |
|
893 |
/* We now have everything we need to set the xenstore entry. */
|
894 |
xs = xs_open(0);
|
895 |
if (xs == NULL) { |
896 |
fprintf(stderr, "Could not contact XenStore\n");
|
897 |
goto out;
|
898 |
} |
899 |
|
900 |
path = xs_get_domain_path(xs, domid); |
901 |
if (path == NULL) { |
902 |
fprintf(stderr, "xs_get_domain_path() error\n");
|
903 |
goto out;
|
904 |
} |
905 |
newpath = realloc(path, (strlen(path) + strlen(string) + |
906 |
strlen("/tty") + 1)); |
907 |
if (newpath == NULL) { |
908 |
fprintf(stderr, "realloc error\n");
|
909 |
goto out;
|
910 |
} |
911 |
path = newpath; |
912 |
|
913 |
strcat(path, string); |
914 |
strcat(path, "/tty");
|
915 |
if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
|
916 |
fprintf(stderr, "xs_write for '%s' fail", string);
|
917 |
goto out;
|
918 |
} |
919 |
ret = 0;
|
920 |
|
921 |
out:
|
922 |
free(path); |
923 |
xs_close(xs); |
924 |
|
925 |
return ret;
|
926 |
} |
927 |
|
928 |
void xenstore_store_pv_console_info(int i, CharDriverState *chr) |
929 |
{ |
930 |
if (i == 0) { |
931 |
store_dev_info(xen_domid, chr, "/console");
|
932 |
} else {
|
933 |
char buf[32]; |
934 |
snprintf(buf, sizeof(buf), "/device/console/%d", i); |
935 |
store_dev_info(xen_domid, chr, buf); |
936 |
} |
937 |
} |
938 |
|
939 |
static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) |
940 |
{ |
941 |
char path[50]; |
942 |
|
943 |
if (xs == NULL) { |
944 |
fprintf(stderr, "xenstore connection not initialized\n");
|
945 |
exit(1);
|
946 |
} |
947 |
|
948 |
snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid); |
949 |
if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
|
950 |
fprintf(stderr, "error recording dm state\n");
|
951 |
exit(1);
|
952 |
} |
953 |
} |
954 |
|
955 |
static void xen_main_loop_prepare(XenIOState *state) |
956 |
{ |
957 |
int evtchn_fd = -1; |
958 |
|
959 |
if (state->xce_handle != XC_HANDLER_INITIAL_VALUE) {
|
960 |
evtchn_fd = xc_evtchn_fd(state->xce_handle); |
961 |
} |
962 |
|
963 |
state->buffered_io_timer = qemu_new_timer_ms(rt_clock, handle_buffered_io, |
964 |
state); |
965 |
|
966 |
if (evtchn_fd != -1) { |
967 |
qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
|
968 |
} |
969 |
} |
970 |
|
971 |
|
972 |
/* Initialise Xen */
|
973 |
|
974 |
static void xen_change_state_handler(void *opaque, int running, |
975 |
RunState state) |
976 |
{ |
977 |
if (running) {
|
978 |
/* record state running */
|
979 |
xenstore_record_dm_state(xenstore, "running");
|
980 |
} |
981 |
} |
982 |
|
983 |
static void xen_hvm_change_state_handler(void *opaque, int running, |
984 |
RunState rstate) |
985 |
{ |
986 |
XenIOState *xstate = opaque; |
987 |
if (running) {
|
988 |
xen_main_loop_prepare(xstate); |
989 |
} |
990 |
} |
991 |
|
992 |
static void xen_exit_notifier(Notifier *n, void *data) |
993 |
{ |
994 |
XenIOState *state = container_of(n, XenIOState, exit); |
995 |
|
996 |
xc_evtchn_close(state->xce_handle); |
997 |
xs_daemon_close(state->xenstore); |
998 |
} |
999 |
|
1000 |
int xen_init(void) |
1001 |
{ |
1002 |
xen_xc = xen_xc_interface_open(0, 0, 0); |
1003 |
if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
|
1004 |
xen_be_printf(NULL, 0, "can't open xen interface\n"); |
1005 |
return -1; |
1006 |
} |
1007 |
qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
|
1008 |
|
1009 |
return 0; |
1010 |
} |
1011 |
|
1012 |
static void xen_read_physmap(XenIOState *state) |
1013 |
{ |
1014 |
XenPhysmap *physmap = NULL;
|
1015 |
unsigned int len, num, i; |
1016 |
char path[80], *value = NULL; |
1017 |
char **entries = NULL; |
1018 |
|
1019 |
snprintf(path, sizeof(path),
|
1020 |
"/local/domain/0/device-model/%d/physmap", xen_domid);
|
1021 |
entries = xs_directory(state->xenstore, 0, path, &num);
|
1022 |
if (entries == NULL) |
1023 |
return;
|
1024 |
|
1025 |
for (i = 0; i < num; i++) { |
1026 |
physmap = g_malloc(sizeof (XenPhysmap));
|
1027 |
physmap->phys_offset = strtoull(entries[i], NULL, 16); |
1028 |
snprintf(path, sizeof(path),
|
1029 |
"/local/domain/0/device-model/%d/physmap/%s/start_addr",
|
1030 |
xen_domid, entries[i]); |
1031 |
value = xs_read(state->xenstore, 0, path, &len);
|
1032 |
if (value == NULL) { |
1033 |
g_free(physmap); |
1034 |
continue;
|
1035 |
} |
1036 |
physmap->start_addr = strtoull(value, NULL, 16); |
1037 |
free(value); |
1038 |
|
1039 |
snprintf(path, sizeof(path),
|
1040 |
"/local/domain/0/device-model/%d/physmap/%s/size",
|
1041 |
xen_domid, entries[i]); |
1042 |
value = xs_read(state->xenstore, 0, path, &len);
|
1043 |
if (value == NULL) { |
1044 |
g_free(physmap); |
1045 |
continue;
|
1046 |
} |
1047 |
physmap->size = strtoull(value, NULL, 16); |
1048 |
free(value); |
1049 |
|
1050 |
snprintf(path, sizeof(path),
|
1051 |
"/local/domain/0/device-model/%d/physmap/%s/name",
|
1052 |
xen_domid, entries[i]); |
1053 |
physmap->name = xs_read(state->xenstore, 0, path, &len);
|
1054 |
|
1055 |
QLIST_INSERT_HEAD(&state->physmap, physmap, list); |
1056 |
} |
1057 |
free(entries); |
1058 |
} |
1059 |
|
1060 |
int xen_hvm_init(void) |
1061 |
{ |
1062 |
int i, rc;
|
1063 |
unsigned long ioreq_pfn; |
1064 |
unsigned long bufioreq_evtchn; |
1065 |
XenIOState *state; |
1066 |
|
1067 |
state = g_malloc0(sizeof (XenIOState));
|
1068 |
|
1069 |
state->xce_handle = xen_xc_evtchn_open(NULL, 0); |
1070 |
if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
|
1071 |
perror("xen: event channel open");
|
1072 |
g_free(state); |
1073 |
return -errno;
|
1074 |
} |
1075 |
|
1076 |
state->xenstore = xs_daemon_open(); |
1077 |
if (state->xenstore == NULL) { |
1078 |
perror("xen: xenstore open");
|
1079 |
g_free(state); |
1080 |
return -errno;
|
1081 |
} |
1082 |
|
1083 |
state->exit.notify = xen_exit_notifier; |
1084 |
qemu_add_exit_notifier(&state->exit); |
1085 |
|
1086 |
state->suspend.notify = xen_suspend_notifier; |
1087 |
qemu_register_suspend_notifier(&state->suspend); |
1088 |
|
1089 |
xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn); |
1090 |
DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
|
1091 |
state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE, |
1092 |
PROT_READ|PROT_WRITE, ioreq_pfn); |
1093 |
if (state->shared_page == NULL) { |
1094 |
hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
|
1095 |
errno, xen_xc); |
1096 |
} |
1097 |
|
1098 |
xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn); |
1099 |
DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
|
1100 |
state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE, |
1101 |
PROT_READ|PROT_WRITE, ioreq_pfn); |
1102 |
if (state->buffered_io_page == NULL) { |
1103 |
hw_error("map buffered IO page returned error %d", errno);
|
1104 |
} |
1105 |
|
1106 |
state->ioreq_local_port = g_malloc0(smp_cpus * sizeof (evtchn_port_t));
|
1107 |
|
1108 |
/* FIXME: how about if we overflow the page here? */
|
1109 |
for (i = 0; i < smp_cpus; i++) { |
1110 |
rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid, |
1111 |
xen_vcpu_eport(state->shared_page, i)); |
1112 |
if (rc == -1) { |
1113 |
fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
|
1114 |
return -1; |
1115 |
} |
1116 |
state->ioreq_local_port[i] = rc; |
1117 |
} |
1118 |
|
1119 |
rc = xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_EVTCHN, |
1120 |
&bufioreq_evtchn); |
1121 |
if (rc < 0) { |
1122 |
fprintf(stderr, "failed to get HVM_PARAM_BUFIOREQ_EVTCHN\n");
|
1123 |
return -1; |
1124 |
} |
1125 |
rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid, |
1126 |
(uint32_t)bufioreq_evtchn); |
1127 |
if (rc == -1) { |
1128 |
fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
|
1129 |
return -1; |
1130 |
} |
1131 |
state->bufioreq_local_port = rc; |
1132 |
|
1133 |
/* Init RAM management */
|
1134 |
xen_map_cache_init(xen_phys_offset_to_gaddr, state); |
1135 |
xen_ram_init(ram_size); |
1136 |
|
1137 |
qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state); |
1138 |
|
1139 |
state->memory_listener = xen_memory_listener; |
1140 |
QLIST_INIT(&state->physmap); |
1141 |
memory_listener_register(&state->memory_listener, &address_space_memory); |
1142 |
state->log_for_dirtybit = NULL;
|
1143 |
|
1144 |
/* Initialize backend core & drivers */
|
1145 |
if (xen_be_init() != 0) { |
1146 |
fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
|
1147 |
exit(1);
|
1148 |
} |
1149 |
xen_be_register("console", &xen_console_ops);
|
1150 |
xen_be_register("vkbd", &xen_kbdmouse_ops);
|
1151 |
xen_be_register("qdisk", &xen_blkdev_ops);
|
1152 |
xen_read_physmap(state); |
1153 |
|
1154 |
return 0; |
1155 |
} |
1156 |
|
1157 |
void destroy_hvm_domain(bool reboot) |
1158 |
{ |
1159 |
XenXC xc_handle; |
1160 |
int sts;
|
1161 |
|
1162 |
xc_handle = xen_xc_interface_open(0, 0, 0); |
1163 |
if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
|
1164 |
fprintf(stderr, "Cannot acquire xenctrl handle\n");
|
1165 |
} else {
|
1166 |
sts = xc_domain_shutdown(xc_handle, xen_domid, |
1167 |
reboot ? SHUTDOWN_reboot : SHUTDOWN_poweroff); |
1168 |
if (sts != 0) { |
1169 |
fprintf(stderr, "xc_domain_shutdown failed to issue %s, "
|
1170 |
"sts %d, %s\n", reboot ? "reboot" : "poweroff", |
1171 |
sts, strerror(errno)); |
1172 |
} else {
|
1173 |
fprintf(stderr, "Issued domain %d %s\n", xen_domid,
|
1174 |
reboot ? "reboot" : "poweroff"); |
1175 |
} |
1176 |
xc_interface_close(xc_handle); |
1177 |
} |
1178 |
} |
1179 |
|
1180 |
void xen_register_framebuffer(MemoryRegion *mr)
|
1181 |
{ |
1182 |
framebuffer = mr; |
1183 |
} |
1184 |
|
1185 |
void xen_shutdown_fatal_error(const char *fmt, ...) |
1186 |
{ |
1187 |
va_list ap; |
1188 |
|
1189 |
va_start(ap, fmt); |
1190 |
vfprintf(stderr, fmt, ap); |
1191 |
va_end(ap); |
1192 |
fprintf(stderr, "Will destroy the domain.\n");
|
1193 |
/* destroy the domain */
|
1194 |
qemu_system_shutdown_request(); |
1195 |
} |
1196 |
|
1197 |
void xen_modified_memory(ram_addr_t start, ram_addr_t length)
|
1198 |
{ |
1199 |
if (unlikely(xen_in_migration)) {
|
1200 |
int rc;
|
1201 |
ram_addr_t start_pfn, nb_pages; |
1202 |
|
1203 |
if (length == 0) { |
1204 |
length = TARGET_PAGE_SIZE; |
1205 |
} |
1206 |
start_pfn = start >> TARGET_PAGE_BITS; |
1207 |
nb_pages = ((start + length + TARGET_PAGE_SIZE - 1) >> TARGET_PAGE_BITS)
|
1208 |
- start_pfn; |
1209 |
rc = xc_hvm_modified_memory(xen_xc, xen_domid, start_pfn, nb_pages); |
1210 |
if (rc) {
|
1211 |
fprintf(stderr, |
1212 |
"%s failed for "RAM_ADDR_FMT" ("RAM_ADDR_FMT"): %i, %s\n", |
1213 |
__func__, start, nb_pages, rc, strerror(-rc)); |
1214 |
} |
1215 |
} |
1216 |
} |