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Allocate physical memory in low virtual address space 

KVM on S390x requires the virtual address space of the guest's RAM to be
within the first 256GB.

The general direction I'd like to see KVM on S390 move is that this requirement
is losened, but for now that's what we're stuck with.

So let's just hack up qemu_ram_alloc until KVM behaves nicely :-).

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Alexander Graf 2009-12-05 12:44:25 +01:00 committed by Aurelien Jarno
parent 0e60a699d2
commit 6b02494d64
1 changed files with 6 additions and 0 deletions
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6
exec.c
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@ -2411,7 +2411,13 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
size = TARGET_PAGE_ALIGN(size);
new_block = qemu_malloc(sizeof(*new_block));
#if defined(TARGET_S390X) && defined(CONFIG_KVM)
/* XXX S390 KVM requires the topmost vma of the RAM to be < 256GB */
new_block->host = mmap((void*)0x1000000, size, PROT_EXEC|PROT_READ|PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
#else
new_block->host = qemu_vmalloc(size);
#endif
#ifdef MADV_MERGEABLE
madvise(new_block->host, size, MADV_MERGEABLE);
#endif