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@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From ca58f3aa53d165afe4ab74c755bc2f6d168617ac Mon Sep 17 00:00:00 2001 From: Sean Christopherson seanjc@google.com Date: Tue, 7 Jun 2022 21:35:51 +0000 Subject: [PATCH] KVM: nVMX: Account for KVM reserved CR4 bits in consistency checks
Check that the guest (L2) and host (L1) CR4 values that would be loaded by nested VM-Enter and VM-Exit respectively are valid with respect to KVM's (L0 host) allowed CR4 bits. Failure to check KVM reserved bits would allow L1 to load an illegal CR4 (or trigger hardware VM-Fail or failed VM-Entry) by massaging guest CPUID to allow features that are not supported by KVM. Amusingly, KVM itself is an accomplice in its doom, as KVM adjusts L1's MSR_IA32_VMX_CR4_FIXED1 to allow L1 to enable bits for L2 based on L1's CPUID model.
Note, although nested_{guest,host}_cr4_valid() are _currently_ used if and only if the vCPU is post-VMXON (nested.vmxon == true), that may not be true in the future, e.g. emulating VMXON has a bug where it doesn't check the allowed/required CR0/CR4 bits.
Cc: stable@vger.kernel.org Fixes: 3899152ccbf4 ("KVM: nVMX: fix checks on CR{0,4} during virtual VMX operation") Signed-off-by: Sean Christopherson seanjc@google.com Message-Id: 20220607213604.3346000-3-seanjc@google.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com
diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h index c92cea0b8ccc..129ae4e01f7c 100644 --- a/arch/x86/kvm/vmx/nested.h +++ b/arch/x86/kvm/vmx/nested.h @@ -281,7 +281,8 @@ static inline bool nested_cr4_valid(struct kvm_vcpu *vcpu, unsigned long val) u64 fixed0 = to_vmx(vcpu)->nested.msrs.cr4_fixed0; u64 fixed1 = to_vmx(vcpu)->nested.msrs.cr4_fixed1;
- return fixed_bits_valid(val, fixed0, fixed1); + return fixed_bits_valid(val, fixed0, fixed1) && + __kvm_is_valid_cr4(vcpu, val); }
/* No difference in the restrictions on guest and host CR4 in VMX operation. */