The patch below does not apply to the 4.19-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 567926cca99ba1750be8aae9c4178796bf9bb90b Mon Sep 17 00:00:00 2001
From: Sean Christopherson sean.j.christopherson@intel.com Date: Tue, 1 Oct 2019 09:21:23 -0700 Subject: [PATCH] KVM: nVMX: Fix consistency check on injected exception error code
Current versions of Intel's SDM incorrectly state that "bits 31:15 of the VM-Entry exception error-code field" must be zero. In reality, bits 31:16 must be zero, i.e. error codes are 16-bit values.
The bogus error code check manifests as an unexpected VM-Entry failure due to an invalid code field (error number 7) in L1, e.g. when injecting a #GP with error_code=0x9f00.
Nadav previously reported the bug[*], both to KVM and Intel, and fixed the associated kvm-unit-test.
[*] https://patchwork.kernel.org/patch/11124749/
Reported-by: Nadav Amit namit@vmware.com Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson sean.j.christopherson@intel.com Reviewed-by: Jim Mattson jmattson@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 41abc62c9a8a..e76eb4f07f6c 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -2610,7 +2610,7 @@ static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu,
/* VM-entry exception error code */ if (CC(has_error_code && - vmcs12->vm_entry_exception_error_code & GENMASK(31, 15))) + vmcs12->vm_entry_exception_error_code & GENMASK(31, 16))) return -EINVAL;
/* VM-entry interruption-info field: reserved bits */