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    Subject[PATCH 5.10 099/530] KVM: nVMX: Truncate base/index GPR value on address calc in !64-bit
    Date
    From: Sean Christopherson <seanjc@google.com>

    commit 82277eeed65eed6c6ee5b8f97bd978763eab148f upstream.

    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>
    Message-Id: <20210422022128.3464144-7-seanjc@google.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/x86/kvm/vmx/nested.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/arch/x86/kvm/vmx/nested.c
    +++ b/arch/x86/kvm/vmx/nested.c
    @@ -4613,9 +4613,9 @@ int get_vmx_mem_address(struct kvm_vcpu
    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);

    /*

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