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[35.185.214.157]) by smtp.gmail.com with ESMTPSA id b15sm11895147pgm.15.2021.07.16.13.26.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Jul 2021 13:26:02 -0700 (PDT) Date: Fri, 16 Jul 2021 20:25:58 +0000 From: Sean Christopherson To: Brijesh Singh Cc: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com Subject: Re: [PATCH Part2 RFC v4 31/40] KVM: X86: update page-fault trace to log the 64-bit error code Message-ID: References: <20210707183616.5620-1-brijesh.singh@amd.com> <20210707183616.5620-32-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210707183616.5620-32-brijesh.singh@amd.com> Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=jIlbt7oo; spf=pass (imf19.hostedemail.com: domain of seanjc@google.com designates 209.85.216.48 as permitted sender) smtp.mailfrom=seanjc@google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: E4ACAB00046D X-Stat-Signature: imdoae8jww4o57997h7xz35kac14y5it X-HE-Tag: 1626467163-679185 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Jul 07, 2021, Brijesh Singh wrote: > The page-fault error code is a 64-bit value, but the trace prints only It's worth clarifying that #NPT has a 64-bit error code, and so KVM also passes around a 64-bit PFEC. E.g. the above statement is wrong for legacy #PF. > the lower 32-bits. Some of the SEV-SNP RMP fault error codes are > available in the upper 32-bits. Can you send this separately with Cc: stable@? And I guess tweak the changelog to replace "SEV-SNP RMP" with a reference to e.g. PFERR_GUEST_FINAL_MASK. KVM already has error codes that can set the upper bits.