The patch below does not apply to the 5.4-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@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 82277eeed65eed6c6ee5b8f97bd978763eab148f Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Message-Id: <20210422022128.3464144-7-seanjc@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
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);
/*
