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[35.185.214.157]) by smtp.gmail.com with ESMTPSA id f7sm20453955pfc.111.2021.07.19.12.03.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Jul 2021 12:03:10 -0700 (PDT) Date: Mon, 19 Jul 2021 19:03:06 +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 25/40] KVM: SVM: Reclaim the guest pages when SEV-SNP VM terminates Message-ID: References: <20210707183616.5620-1-brijesh.singh@amd.com> <20210707183616.5620-26-brijesh.singh@amd.com> <2711d9f9-21a0-7baa-d0ff-2c0f69ca6949@amd.com> <912c929c-06ba-a391-36bb-050384907d81@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <912c929c-06ba-a391-36bb-050384907d81@amd.com> Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=cKMSuskX; spf=pass (imf24.hostedemail.com: domain of seanjc@google.com designates 209.85.216.52 as permitted sender) smtp.mailfrom=seanjc@google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspamd-Server: rspam02 X-Stat-Signature: fg8pqxgiuf97n3zt5qbqdy5id4xpbcpy X-Rspamd-Queue-Id: 69C3DB0000A0 X-HE-Tag: 1626721392-520044 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 Mon, Jul 19, 2021, Brijesh Singh wrote: > > On 7/19/21 12:18 PM, Sean Christopherson wrote: > > > > > > Okay, I will add helper to make things easier. One case where we will > > > need to directly call the rmpupdate() is during the LAUNCH_UPDATE > > > command. In that case the page is private and its immutable bit is also > > > set. This is because the firmware makes change to the page, and we are > > > required to set the immutable bit before the call. > > > > Or do "int rmp_make_firmware(u64 pfn, bool immutable)"? > > That's not what we need. > > We need 'rmp_make_private() + immutable' all in one RMPUPDATE. Here is the > snippet from SNP_LAUNCH_UPDATE. Ah, not firmwrare, gotcha. But we can still use a helper, e.g. an inner double-underscore helper, __rmp_make_private().