Revision ff83678a

b/exec.c
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#endif
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        } else {
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#if defined(TARGET_S390X) && defined(CONFIG_KVM)
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            /* XXX S390 KVM requires the topmost vma of the RAM to be < 256GB */
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            new_block->host = mmap((void*)0x1000000, size,
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            /* S390 KVM requires the topmost vma of the RAM to be smaller than
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               an system defined value, which is at least 256GB. Larger systems
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               have larger values. We put the guest between the end of data
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               segment (system break) and this value. We use 32GB as a base to
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               have enough room for the system break to grow. */
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            new_block->host = mmap((void*)0x800000000, size,
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                                   PROT_EXEC|PROT_READ|PROT_WRITE,
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                                   MAP_SHARED | MAP_ANONYMOUS, -1, 0);
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                                   MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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#else
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            if (xen_mapcache_enabled()) {
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                xen_ram_alloc(new_block->offset, size);

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