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Message-ID: <7a038a4c2ae4387fb366f6c2e9b1ce512f5345bc.camel@infradead.org>
Subject: Re: [PATCH v8 07/15] KVM: pfncache: include page offset in uhva and
 use it consistently
From:   David Woodhouse <dwmw2@infradead.org>
To:     Xu Yilun <yilun.xu@linux.intel.com>
Cc:     Paul Durrant <paul@xen.org>,
        Sean Christopherson <seanjc@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Date:   Wed, 22 Nov 2023 15:42:07 +0000
In-Reply-To: <ZV4PyvTBOohiRyLS@yilunxu-OptiPlex-7050>
References: <20231121180223.12484-1-paul@xen.org>
         <20231121180223.12484-8-paul@xen.org>
         <ZV3Bwghwz63LmgMu@yilunxu-OptiPlex-7050>
         <b6b864e500cbb38f76739fcfb4dcc6e9c6705d0b.camel@infradead.org>
         <ZV4PyvTBOohiRyLS@yilunxu-OptiPlex-7050>
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On Wed, 2023-11-22 at 22:27 +0800, Xu Yilun wrote:
> On Wed, Nov 22, 2023 at 09:12:18AM +0000, David Woodhouse wrote:
> > On Wed, 2023-11-22 at 16:54 +0800, Xu Yilun wrote:
> > >=20
> > > > @@ -259,13 +258,25 @@ static int __kvm_gpc_refresh(struct gfn_to_pf=
n_cache *gpc, gpa_t gpa,
> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0ret =3D -EFAULT;
> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0goto out;
> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0}
> > > > +
> > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0hva_change =3D true;
> > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0} else {
> > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0/*
> > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 * No need to do any re-mapping if the only thing t=
hat has
> > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 * changed is the page offset. Just page align it t=
o allow the
> > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 * new offset to be added in.
> > >=20
> > > I don't understand how the uhva('s offset) could be changed when both=
 gpa and
> > > slot are not changed. Maybe I have no knowledge of xen, but in later
> > > patch you said your uhva would never change...
> >=20
> > It doesn't change on a normal refresh with kvm_gpc_refresh(), which is
> > just for revalidation after memslot changes or MMU invalidation.
> >=20
> > But it can change if the gpc is being reinitialized with a new address
> > (perhaps because the guest has made another hypercall to set the
> > address, etc.)
> >=20
> > That new address could happen to be in the *same* page as the previous
>=20
> In this case, the lower bits of new gpa should be different to gpc->gpa,
> so will hit "if (gpc->gpa !=3D gpa ...)" branch.

I think that 'if (gpc->gpa !=3D gpa); branch is also gratuitously
refreshing when it doesn't need to; it only needs to refresh if the
*aligned* gpas don't match.

But it was like that already, so I won't heckle Paul any further :)

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