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| author | Sean Christopherson <seanjc@google.com> | 2021-04-22 05:21:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-14 10:44:15 +0300 |
| commit | cc6623055f2d9c45c2a977985f3408f426e83c76 (patch) | |
| tree | a8cfe2e79d8cc25c9858e3349a8f33b2ae2b789d | |
| parent | 3582644257477000e788155c27c4023bd3d8745a (diff) | |
| download | linux-cc6623055f2d9c45c2a977985f3408f426e83c76.tar.xz | |
KVM: nVMX: Truncate bits 63:32 of VMCS field on nested check in !64-bit
commit ee050a577523dfd5fac95e6cc182ebe0293ead59 upstream.
Drop bits 63:32 of the VMCS field encoding when checking for a nested
VM-Exit on VMREAD/VMWRITE in !64-bit mode. VMREAD and VMWRITE always
use 32-bit operands outside of 64-bit mode.
The actual emulation of VMREAD/VMWRITE does the right thing, this bug is
purely limited to incorrectly causing a nested VM-Exit if a GPR happens
to have bits 63:32 set outside of 64-bit mode.
Fixes: a7cde481b6e8 ("KVM: nVMX: Do not forward VMREAD/VMWRITE VMExits to L1 if required so by vmcs12 vmread/vmwrite bitmaps")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210422022128.3464144-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kvm/vmx/nested.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index e32e8bcf9455..3f63bd7421ac 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -5308,7 +5308,7 @@ static bool nested_vmx_exit_handled_vmcs_access(struct kvm_vcpu *vcpu, /* Decode instruction info and find the field to access */ vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); - field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); + field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); /* Out-of-range fields always cause a VM exit from L2 to L1 */ if (field >> 15) |