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kvm: Avoid COW if KVM MMU is asynchronous

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Avi Kivity wrote:
> Suggest wrapping in a function and hiding it deep inside kvm-all.c.
>

Done in v2:

---------->

If the KVM MMU is asynchronous (kernel does not support MMU_NOTIFIER),
we have to avoid COW for the guest memory. Otherwise we risk serious
breakage when guest pages change there physical locations due to COW
after fork. Seen when forking smbd during runtime via -smb.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2009-04-26 18:03:40 +02:00 • committed by Anthony Liguori
parent 8563d5b31d
commit 6f0437e8de
3 changed files with 23 additions and 0 deletions
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3
exec.c
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@ -2484,6 +2484,9 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
last_ram_offset += size;
if (kvm_enabled())
kvm_setup_guest_memory(new_block->host, size);
return new_block->offset;
}