From: Hollis Blanchard Date: Fri, 7 Nov 2008 19:32:12 +0000 (-0600) Subject: KVM: ensure that memslot userspace addresses are page-aligned X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=78749809222be5083e21bfe697b44ab797e5c0a8;p=linux-beck.git 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 Signed-off-by: Avi Kivity --- 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)