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KVM: Prevent internal slots from being COWed

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If a process with a memory slot is COWed, the page will change its address
(despite having an elevated reference count).  This breaks internal memory
slots which have their physical addresses loaded into vmcs registers (see
the APIC access memory slot).

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-06-21 10:57:45 +03:00
parent e36d96f7cf
commit 7ac77099ce
1 changed files with 6 additions and 1 deletions
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7
arch/x86/kvm/x86.c
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@ -5491,6 +5491,11 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
int user_alloc) int user_alloc)
{ {
int npages = memslot->npages; int npages = memslot->npages;
int map_flags = MAP_PRIVATE | MAP_ANONYMOUS;
/* Prevent internal slot pages from being moved by fork()/COW. */
if (memslot->id >= KVM_MEMORY_SLOTS)
map_flags = MAP_SHARED | MAP_ANONYMOUS;
/*To keep backward compatibility with older userspace, /*To keep backward compatibility with older userspace,
*x86 needs to hanlde !user_alloc case. *x86 needs to hanlde !user_alloc case.
@ -5503,7 +5508,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
userspace_addr = do_mmap(NULL, 0, userspace_addr = do_mmap(NULL, 0,
npages * PAGE_SIZE, npages * PAGE_SIZE,
PROT_READ | PROT_WRITE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, map_flags,
0); 0);
up_write(&current->mm->mmap_sem); up_write(&current->mm->mmap_sem);