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| author | Haozhong Zhang <haozhong.zhang@intel.com> | 2015-11-25 09:21:39 (GMT) |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-11-25 14:52:55 (GMT) |
| commit | b2467e744f89fcb2e723143c2b78bcbaf391828a (patch) | |
| tree | 6bf43a5affc9ecc1a8d027dbb2fad3e72eb2ea36 /arch/x86/kvm | |
| parent | 8bd142c01648cdb33e9bcafa0448ba2c20ed814c (diff) | |
| download | linux-b2467e744f89fcb2e723143c2b78bcbaf391828a.tar.xz | |
KVM: nVMX: remove incorrect vpid check in nested invvpid emulation
This patch removes the vpid check when emulating nested invvpid
instruction of type all-contexts invalidation. The existing code is
incorrect because:
(1) According to Intel SDM Vol 3, Section "INVVPID - Invalidate
Translations Based on VPID", invvpid instruction does not check
vpid in the invvpid descriptor when its type is all-contexts
invalidation.
(2) According to the same document, invvpid of type all-contexts
invalidation does not require there is an active VMCS, so/and
get_vmcs12() in the existing code may result in a NULL-pointer
dereference. In practice, it can crash both KVM itself and L1
hypervisors that use invvpid (e.g. Xen).
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 87acc52..af823a3 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7394,11 +7394,6 @@ static int handle_invvpid(struct kvm_vcpu *vcpu) switch (type) { case VMX_VPID_EXTENT_ALL_CONTEXT: - if (get_vmcs12(vcpu)->virtual_processor_id == 0) { - nested_vmx_failValid(vcpu, - VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID); - return 1; - } __vmx_flush_tlb(vcpu, to_vmx(vcpu)->nested.vpid02); nested_vmx_succeed(vcpu); break; |