Messages in this thread Patch in this message | | | Date | Fri, 12 Feb 2021 17:05:15 -0800 | Subject | [PATCH 6/9] KVM: nVMX: Truncate base/index GPR value on address calc in !64-bit | From | Sean Christopherson <> |
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Drop bits 63:32 of the base and/or index GPRs when calculating the effective address of a VMX instruction memory operand. Outside of 64-bit mode, memory encodings are strictly limited to E*X and below.
Fixes: 064aea774768 ("KVM: nVMX: Decoding memory operands of VMX instructions") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kvm/vmx/nested.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index d6c892ea551c..a02d8744ca66 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4601,9 +4601,9 @@ int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification, else if (addr_size == 0) off = (gva_t)sign_extend64(off, 15); if (base_is_valid) - off += kvm_register_read(vcpu, base_reg); + off += kvm_register_readl(vcpu, base_reg); if (index_is_valid) - off += kvm_register_read(vcpu, index_reg) << scaling; + off += kvm_register_readl(vcpu, index_reg) << scaling; vmx_get_segment(vcpu, &s, seg_reg); /* -- 2.30.0.478.g8a0d178c01-goog
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