Received-SPF: pass (google.com: domain of linux-crypto+bounces-1987-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
Date: Mon, 12 Feb 2024 10:42:27 -0600
From: Michael Roth <michael.roth@amd.com>
To: Paolo Bonzini <pbonzini@redhat.com>
CC: Sean Christopherson <seanjc@google.com>, <kvm@vger.kernel.org>,
	<linux-coco@lists.linux.dev>, <linux-mm@kvack.org>,
	<linux-crypto@vger.kernel.org>, <x86@kernel.org>,
	<linux-kernel@vger.kernel.org>, <tglx@linutronix.de>, <mingo@redhat.com>,
	<jroedel@suse.de>, <thomas.lendacky@amd.com>, <hpa@zytor.com>,
	<ardb@kernel.org>, <vkuznets@redhat.com>, <jmattson@google.com>,
	<luto@kernel.org>, <dave.hansen@linux.intel.com>, <slp@redhat.com>,
	<pgonda@google.com>, <peterz@infradead.org>,
	<srinivas.pandruvada@linux.intel.com>, <rientjes@google.com>,
	<dovmurik@linux.ibm.com>, <tobin@ibm.com>, <bp@alien8.de>, <vbabka@suse.cz>,
	<kirill@shutemov.name>, <ak@linux.intel.com>, <tony.luck@intel.com>,
	<sathyanarayanan.kuppuswamy@linux.intel.com>, <alpergun@google.com>,
	<jarkko@kernel.org>, <ashish.kalra@amd.com>, <nikunj.dadhania@amd.com>,
	<pankaj.gupta@amd.com>, <liam.merwick@oracle.com>, <zhi.a.wang@intel.com>,
	Isaku Yamahata <isaku.yamahata@intel.com>
Subject: Re: [PATCH v11 06/35] KVM: x86/mmu: Pass around full 64-bit error
 code for KVM page faults
Message-ID: <20240212164227.e3647svomtqfld6l@amd.com>
References: <20231230172351.574091-1-michael.roth@amd.com>
 <20231230172351.574091-7-michael.roth@amd.com>
 <ZcKb6VGbNZHlQkzg@google.com>
 <CABgObfbMuU5axeCYykXitrKGgV5Zw-BB843--Gp4t_rLe2=gPw@mail.gmail.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CABgObfbMuU5axeCYykXitrKGgV5Zw-BB843--Gp4t_rLe2=gPw@mail.gmail.com>
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Feb 2024 16:48:15.7989
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 539bbb21-d96c-49a9-37a4-08dc2bea68c5
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource:
	SJ1PEPF00001CEA.namprd03.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6578

On Mon, Feb 12, 2024 at 11:00:27AM +0100, Paolo Bonzini wrote:
> On Tue, Feb 6, 2024 at 9:52 PM Sean Christopherson <seanjc@google.com> wrote:
> >
> > On Sat, Dec 30, 2023, Michael Roth wrote:
> > > In some cases the full 64-bit error code for the KVM page fault will be
> > > needed to determine things like whether or not a fault was for a private
> > > or shared guest page, so update related code to accept the full 64-bit
> > > value so it can be plumbed all the way through to where it is needed.
> > >
> > > The accessors of fault->error_code are changed as follows:
> > >
> > > - FNAME(page_fault): change to explicitly use lower_32_bits() since that
> > >                      is no longer done in kvm_mmu_page_fault()
> > > - kvm_mmu_page_fault(): explicit mask with PFERR_RSVD_MASK,
> > >                         PFERR_NESTED_GUEST_PAGE
> > > - mmutrace: changed u32 -> u64
> > >
> > > Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
> > > Link: https://lore.kernel.org/kvm/20230612042559.375660-1-michael.roth@amd.com/T/#mbd0b20c9a2cf50319d5d2a27b63f73c772112076
> > > [mdr: drop references/changes to code not in current gmem tree, update
> > >       commit message]
> > > Signed-off-by: Michael Roth <michael.roth@amd.com>
> >
> > I assume Isaku is the original author?  If so, that's missing from this patch.
> 
> The root of this patch seem to be in a reply to "KVM: x86: Add
> 'fault_is_private' x86 op"
> (https://patchew.org/linux/20230220183847.59159-1-michael.roth@amd.com/20230220183847.59159-2-michael.roth@amd.com/),
> so yes.

Yes this is Isaku's patch, I think the authorship got mangled during a rebase.
I'll make sure to get that fixed up.

-Mike

> 
> Paolo
>