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| author | Hollis Blanchard <hollisb@us.ibm.com> | 2008-11-07 13:32:12 -0600 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2008-12-31 16:52:24 +0200 |
| commit | 78749809222be5083e21bfe697b44ab797e5c0a8 (patch) | |
| tree | b74c56a966afb58f81372213fe6fc47cb13a749a /virt | |
| parent | 0fdf8e59faa5c60e9d77c8e14abe3a0f8bfcf586 (diff) | |
| download | linux-78749809222be5083e21bfe697b44ab797e5c0a8.tar.gz linux-78749809222be5083e21bfe697b44ab797e5c0a8.tar.bz2 linux-78749809222be5083e21bfe697b44ab797e5c0a8.zip | |
KVM: ensure that memslot userspace addresses are page-aligned
Bad page translation and silent guest failure ensue if the userspace address is
not page-aligned. I hit this problem using large (host) pages with qemu,
because qemu currently has a hardcoded 4096-byte alignment for guest memory
allocations.
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index a65baa9039d5..0a0a9595ba3b 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -715,6 +715,8 @@ int __kvm_set_memory_region(struct kvm *kvm, goto out; if (mem->guest_phys_addr & (PAGE_SIZE - 1)) goto out; + if (mem->userspace_addr & (PAGE_SIZE - 1)) + goto out; if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) goto out; if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) |