linux-kernel - Re: [PATCH v6 1/5] x86/kvm: Add AMD SEV specific Hypercall3

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Message-ID: <2213EC9B-E3EC-4F23-BC1A-B11DF6288EE3@amd.com>
Date:   Tue, 28 Sep 2021 19:26:32 +0000
From:   "Kalra, Ashish" <Ashish.Kalra@....com>
To:     Steve Rutherford <srutherford@...gle.com>
CC:     Borislav Petkov <bp@...en8.de>,
        Sean Christopherson <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Singh, Brijesh" <brijesh.singh@....com>,
        "dovmurik@...ux.ibm.com" <dovmurik@...ux.ibm.com>,
        "tobin@...ux.ibm.com" <tobin@...ux.ibm.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "dgilbert@...hat.com" <dgilbert@...hat.com>
Subject: Re: [PATCH v6 1/5] x86/kvm: Add AMD SEV specific Hypercall3



> On Sep 28, 2021, at 2:05 PM, Steve Rutherford <srutherford@...gle.com> wrote:
> 
> On Wed, Sep 22, 2021 at 6:54 AM Borislav Petkov <bp@...en8.de> wrote:
>> 
>>> On Wed, Sep 22, 2021 at 12:10:08PM +0000, Ashish Kalra wrote:
>>> Then isn't it cleaner to simply do it via the paravirt_ops interface,
>>> i.e, pv_ops.mmu.notify_page_enc_status_changed() where the callback
>>> is only set when SEV and live migration feature are supported and
>>> invoked through early_set_memory_decrypted()/encrypted().
>>> 
>>> Another memory encryption platform can set it's callback accordingly.
>> 
>> Yeah, that sounds even cleaner to me.
> If I'm not mistaken, this is what the patch set does now?

Yes that’s what I mentioned to Boris.

Thanks,
Ashish