The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 82277eeed65eed6c6ee5b8f97bd978763eab148f Mon Sep 17 00:00:00 2001
From: Sean Christopherson seanjc@google.com Date: Wed, 21 Apr 2021 19:21:25 -0700 Subject: [PATCH] KVM: nVMX: Truncate base/index GPR value on address calc in !64-bit
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
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index f93ff2302b4c..ac838fb2aa4e 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4619,9 +4619,9 @@ 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);
/*