This is a note to let you know that I've just added the patch titled
KVM: MMU: handle invalid root_hpa at __direct_map
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-mmu-handle-invalid-root_hpa-at-__direct_map.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 989c6b34f6a9480e397b170cc62237e89bf4fdb9 Mon Sep 17 00:00:00 2001
From: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Date: Thu, 19 Dec 2013 15:28:51 -0200
Subject: KVM: MMU: handle invalid root_hpa at __direct_map
From: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
commit 989c6b34f6a9480e397b170cc62237e89bf4fdb9 upstream.
It is possible for __direct_map to be called on invalid root_hpa
(-1), two examples:
1) try_async_pf -> can_do_async_pf
-> vmx_interrupt_allowed -> nested_vmx_vmexit
2) vmx_handle_exit -> vmx_interrupt_allowed -> nested_vmx_vmexit
Then to load_vmcs12_host_state and kvm_mmu_reset_context.
Check for this possibility, let fault exception be regenerated.
BZ: https://bugzilla.redhat.com/show_bug.cgi?id=924916
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2451,6 +2451,9 @@ static int __direct_map(struct kvm_vcpu
int emulate = 0;
gfn_t pseudo_gfn;
+ if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
+ return 0;
+
for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) {
if (iterator.level == level) {
unsigned pte_access = ACC_ALL;
Patches currently in stable-queue which might be from mtosatti@xxxxxxxxxx are
queue-3.4/kvm-vmx-fix-use-after-free-of-vmx-loaded_vmcs.patch
queue-3.4/kvm-mmu-handle-invalid-root_hpa-at-__direct_map.patch
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