Re: [RFC 08/16] KVM: SVM: include CR3 in initial VMSA state for SEV-ES guests

From: Paolo Bonzini <pbonzini@redhat.com>
To: Michael Roth <michael.roth@amd.com>, linux-kselftest@vger.kernel.org
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	x86@kernel.org, Nathan Tempelman <natet@google.com>,
	Marc Orr <marcorr@google.com>,
	Steve Rutherford <srutherford@google.com>,
	Sean Christopherson <seanjc@google.com>,
	Mingwei Zhang <mizhang@google.com>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Varad Gautam <varad.gautam@suse.com>,
	Shuah Khan <shuah@kernel.org>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	David Woodhouse <dwmw@amazon.co.uk>,
	Ricardo Koller <ricarkol@google.com>,
	Jim Mattson <jmattson@google.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Joerg Roedel <joro@8bytes.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H . Peter Anvin" <hpa@zytor.com>
Subject: Re: [RFC 08/16] KVM: SVM: include CR3 in initial VMSA state for SEV-ES guests
Date: Thu, 21 Oct 2021 18:43:34 +0200	[thread overview]
Message-ID: <1661def3-45d1-9aab-aeb4-5b934179d3ab@redhat.com> (raw)
In-Reply-To: <20211006203747.13479-1-michael.roth@amd.com>

On 06/10/21 22:37, Michael Roth wrote:
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index c1a2dd0024b2..d724fa185bef 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -10400,8 +10400,7 @@ static int __set_sregs_common(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs,
>   
>   	vcpu->arch.cr2 = sregs->cr2;
>   	*mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
> -	vcpu->arch.cr3 = sregs->cr3;
> -	kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
> +	static_call(kvm_x86_set_cr3)(vcpu, sregs->cr3);
>   
>   	kvm_set_cr8(vcpu, sregs->cr8);
>   
> 

Can you instead make the hook "post_set_sregs", and keep these two lines 
in __set_sregs_common?

Thanks,

Paolo