linux-kernel - Re: [PATCH v8 5/8] KVM: Register/unregister the guest private memory regions

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Date:   Wed, 19 Oct 2022 16:02:22 +0100
From:   Fuad Tabba <tabba@...gle.com>
To:     Chao Peng <chao.p.peng@...ux.intel.com>
Cc:     Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, qemu-devel@...gnu.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, Mike Rapoport <rppt@...nel.org>,
        Steven Price <steven.price@....com>,
        "Maciej S . Szmigiero" <mail@...iej.szmigiero.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        luto@...nel.org, jun.nakajima@...el.com, dave.hansen@...el.com,
        ak@...ux.intel.com, david@...hat.com, aarcange@...hat.com,
        ddutile@...hat.com, dhildenb@...hat.com,
        Quentin Perret <qperret@...gle.com>,
        Michael Roth <michael.roth@....com>, mhocko@...e.com,
        Muchun Song <songmuchun@...edance.com>, wei.w.wang@...el.com
Subject: Re: [PATCH v8 5/8] KVM: Register/unregister the guest private memory regions

> > > This sounds good. Thank you.
> >
> > I like the idea of a separate Kconfig, e.g. CONFIG_KVM_GENERIC_PRIVATE_MEM or
> > something.  I highly doubt there will be any non-x86 users for multiple years,
> > if ever, but it would allow testing the private memory stuff on ARM (and any other
> > non-x86 arch) without needing full pKVM support and with only minor KVM
> > modifications, e.g. the x86 support[*] to test UPM without TDX is shaping up to be
> > trivial.
>
> CONFIG_KVM_GENERIC_PRIVATE_MEM looks good to me.

That sounds good to me, and just keeping the xarray isn't really an
issue for pKVM. We could end up using it instead of some of the other
structures we use for tracking.

Cheers,
/fuad

> Thanks,
> Chao
> >
> > [*] https://lore.kernel.org/all/Y0mu1FKugNQG5T8K@google.com