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authorJan Kiszka <jan.kiszka@web.de>2009-04-26 18:03:40 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2009-05-01 09:44:11 -0500
commit6f0437e8de95aebbd9e66af4d074c0d5119d86b7 (patch)
treed761a5e3bf4b2c4075415c3f880e65baf33856d8 /kvm.h
parent8563d5b31d1b1b43f3304ba59535b6b878c15a2d (diff)
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kvm: Avoid COW if KVM MMU is asynchronous
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>
Diffstat (limited to 'kvm.h')
-rw-r--r--kvm.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/kvm.h b/kvm.h
index 803a874..0ea2426 100644
--- a/kvm.h
+++ b/kvm.h
@@ -48,6 +48,8 @@ int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size);
int kvm_has_sync_mmu(void);
+void kvm_setup_guest_memory(void *start, size_t size);
+
int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size);
int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size);