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bh=DHCUEHp3mAbHZmlWLmQQYc0YJzSL3HZXdvwddGnkOCc=; b=CtjLkkuTFifA9KCBvYK0lI0yolzPssxiQLP2S5DQZBVYLyKAuOmc6OGzlD/Sg8box/ EsuPNbrEP6ruGnZ0RuI/mUwHd/Z2IFPo2HHOr34ec3KUNhWiCvwPgUg5PHgStWF9tqHK 20Pb5eLVGf54CD4bbmPxflWBpALMFEwWd+XA0nC/TJuCK3DgKLfGUDNKGOIe44iW3JYL YZCioNVg/fvtA/WRRViPkJPspp47swqGMyPBCOAioYCMleXrAOmA87wZCPvtXu64gp/O +EE1+JRT7HiJ0wT395Gdm8IymsR5xrnTHswILAZrVjwlyZyx80hRyxHSc9TMKMshJ/A0 OCHw== X-Gm-Message-State: AFqh2kolqCiKyj5xEX1bnMjBcZeSVis4UnutsIILw/dzzSSpyrwMaIRe RnjC/KlEsZHy3UC8gVvnB8M= X-Received: by 2002:a62:7b11:0:b0:586:e399:9cd4 with SMTP id w17-20020a627b11000000b00586e3999cd4mr40488569pfc.25.1674355574415; Sat, 21 Jan 2023 18:46:14 -0800 (PST) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:36:d4:8b9d:a9e7:109b]) by smtp.gmail.com with ESMTPSA id b75-20020a621b4e000000b0058ba53aaa75sm18523094pfb.99.2023.01.21.18.46.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Jan 2023 18:46:14 -0800 (PST) From: Tianyu Lan To: luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, seanjc@google.com, pbonzini@redhat.com, jgross@suse.com, tiala@microsoft.com, kirill@shutemov.name, jiangshan.ljs@antgroup.com, peterz@infradead.org, ashish.kalra@amd.com, srutherford@google.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, pawan.kumar.gupta@linux.intel.com, adrian.hunter@intel.com, daniel.sneddon@linux.intel.com, alexander.shishkin@linux.intel.com, sandipan.das@amd.com, ray.huang@amd.com, brijesh.singh@amd.com, michael.roth@amd.com, thomas.lendacky@amd.com, venu.busireddy@oracle.com, sterritt@google.com, tony.luck@intel.com, samitolvanen@google.com, fenghua.yu@intel.com Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org Subject: [RFC PATCH V3 02/16] x86/hyperv: Decrypt hv vp assist page in sev-snp enlightened guest Date: Sat, 21 Jan 2023 21:45:52 -0500 Message-Id: <20230122024607.788454-3-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230122024607.788454-1-ltykernel@gmail.com> References: <20230122024607.788454-1-ltykernel@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1755689110631114106?= X-GMAIL-MSGID: =?utf-8?q?1755689110631114106?= From: Tianyu Lan hv vp assist page is shared between sev snp guest and hyperv. Decrypt the page when use it. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/hv_init.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index a5f9474f08e1..24154c1ee12b 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -29,6 +29,7 @@ #include #include #include +#include int hyperv_init_cpuhp; u64 hv_current_partition_id = ~0ull; @@ -113,6 +114,11 @@ static int hv_cpu_init(unsigned int cpu) } if (!WARN_ON(!(*hvp))) { + if (hv_isolation_type_en_snp()) { + WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1)); + memset(*hvp, 0, PAGE_SIZE); + } + msr.enable = 1; wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, msr.as_uint64); }