linux-kernel - Re: [PATCH 4/8] KVM: SVM: move guest vmsave/vmload to assembly

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Message-ID: <19c32786-6f5b-d438-269b-d29c104817ac@redhat.com>
Date:   Mon, 7 Nov 2022 16:37:53 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Andrew Cooper <Andrew.Cooper3@...rix.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Cc:     "nathan@...nel.org" <nathan@...nel.org>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 4/8] KVM: SVM: move guest vmsave/vmload to assembly

On 11/7/22 16:32, Andrew Cooper wrote:
>> -		vmload(svm->vmcb01.pa);
>>   		__svm_vcpu_run(vmcb_pa, svm);
>> -		vmsave(svm->vmcb01.pa);
>> -
>>   		vmload(__sme_page_pa(sd->save_area));
>
> %gs is still the guests until this vmload has completed.  It needs to
> move down into asm too.

Sure, that's patch 6 in the series.  See also cover letter: "this means 
moving guest vmload/vmsave and host vmload to assembly".

Paolo