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From: Maxim Levitsky <mlevitsk@redhat.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>,
	kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	Cathy Avery <cavery@redhat.com>,
	Emanuele Giuseppe Esposito <eesposit@redhat.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Michael Roth <mdroth@linux.vnet.ibm.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/6] KVM: nSVM: Check the value written to MSR_VM_HSAVE_PA
Date: Wed, 07 Jul 2021 13:28:10 +0300	[thread overview]
Message-ID: <595c45e8fb753556b2c01b25ac7052369c8357ac.camel@redhat.com> (raw)
In-Reply-To: <20210628104425.391276-2-vkuznets@redhat.com>

On Mon, 2021-06-28 at 12:44 +0200, Vitaly Kuznetsov wrote:
> APM states that #GP is raised upon write to MSR_VM_HSAVE_PA when
> the supplied address is not page-aligned or is outside of "maximum
> supported physical address for this implementation".
> page_address_valid() check seems suitable. Also, forcefully page-align
> the address when it's written from VMM.

Minor nitpick: I would have checked the host provided value as well,
just in case since there is no reason why it won't pass the same check, 
and fail if the value is not aligned. 

Other than that:
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
	Maxim Levitsky

> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
>  arch/x86/kvm/svm/svm.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index 8834822c00cd..b6f85fd19f96 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -2941,7 +2941,10 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
>  			svm_disable_lbrv(vcpu);
>  		break;
>  	case MSR_VM_HSAVE_PA:
> -		svm->nested.hsave_msr = data;
> +		if (!msr->host_initiated && !page_address_valid(vcpu, data))
> +			return 1;
> +
> +		svm->nested.hsave_msr = data & PAGE_MASK;
>  		break;
>  	case MSR_VM_CR:
>  		return svm_set_vm_cr(vcpu, data);



  reply	other threads:[~2021-07-07 10:28 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-28 10:44 [PATCH 0/6] KVM: nSVM: Fix issues when SMM is entered from L2 Vitaly Kuznetsov
2021-06-28 10:44 ` [PATCH 1/6] KVM: nSVM: Check the value written to MSR_VM_HSAVE_PA Vitaly Kuznetsov
2021-07-07 10:28   ` Maxim Levitsky [this message]
2021-07-08 17:27     ` Paolo Bonzini
2021-07-09  6:08       ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 2/6] KVM: nSVM: Check that VM_HSAVE_PA MSR was set before VMRUN Vitaly Kuznetsov
2021-07-07 10:28   ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 3/6] KVM: nSVM: Introduce svm_copy_nonvmloadsave_state() Vitaly Kuznetsov
2021-07-05 12:08   ` Paolo Bonzini
2021-07-07 10:29     ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 4/6] KVM: nSVM: Fix L1 state corruption upon return from SMM Vitaly Kuznetsov
2021-07-07 10:32   ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 5/6] KVM: nSVM: Restore nested control upon leaving SMM Vitaly Kuznetsov
2021-07-07 10:35   ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 6/6] KVM: selftests: smm_test: Test SMM enter from L2 Vitaly Kuznetsov
2021-07-07 10:35   ` Maxim Levitsky
2021-07-08 17:40 ` [PATCH 0/6] KVM: nSVM: Fix issues when SMM is entered " Paolo Bonzini

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