linux-kernel - Re: [PATCH v2 2/4] mm: x86: Invoke hypercall when page encryption status is changed

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Message-ID: <YJ4n2Ypmq/7U1znM@zn.tnic>
Date:   Fri, 14 May 2021 09:33:45 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ashish Kalra <ashish.kalra@....com>
Cc:     seanjc@...gle.com, pbonzini@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, joro@...tes.org,
        thomas.lendacky@....com, x86@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, srutherford@...gle.com,
        venu.busireddy@...cle.com, brijesh.singh@....com
Subject: Re: [PATCH v2 2/4] mm: x86: Invoke hypercall when page encryption
 status is changed

On Thu, May 13, 2021 at 04:34:41AM +0000, Ashish Kalra wrote:
> What's the use of notification of a partial page list, even a single
> incorrect guest page encryption status can crash the guest/migrated
> guest.

Ok, so explain to me how this looks from the user standpoint: she starts
migrating the guest, it fails to lookup an address, there's nothing
saying where it failed but the guest crashed.

Do you think this is user-friendly?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette