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bh=MSuNKkMXWHSa3J60m4rY4F79SY/10La9kbhfpfz9TzE=; b=PegM51jYgPsvcmcByz58py8QyRD4vTae3b9BXGy5u27oyF8MUt2jUXISaIDCken1J+ nxdt2Va3gQ23tHY17xjImzq3FW4v7Uc06C6Y+o6SCnM75ZEAFGk3GsDP0DHsro23Qf1b 8P//sHRKHrdW4bpUl9PjYbx4zqLA/uMG2cIh8YgPi3I9NmZPMgyZOPYnmX8ZWUtbuWgG smQvsGq50RJdGeSU55sQLutLufg3B8NGkeCpWNe4XP0MtxQZYggb5VOG1GdgE8Vf+N1B hQwhvDHVFcfYJSi69OKy4HnEkTK7OwaZJBNUle38I1np1w70x/YZOMCq4hjqSvQUKTdF e03w== X-Gm-Message-State: AFqh2kpgpljVrP/Tyxd86h88yw7k/1Lvu8srrInQh9LVmuqPE9G1ScXM vOxO2svo3vJpy6aGq+m4LDc= X-Received: by 2002:a62:79d2:0:b0:582:b089:d9be with SMTP id u201-20020a6279d2000000b00582b089d9bemr21737321pfc.13.1674355581499; Sat, 21 Jan 2023 18:46:21 -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.99.2023.01.21.18.46.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Jan 2023 18:46:21 -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 07/16] drivers: hv: Decrypt percpu hvcall input arg page in sev-snp enlightened guest Date: Sat, 21 Jan 2023 21:45:57 -0500 Message-Id: <20230122024607.788454-8-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?1755689157992717597?= X-GMAIL-MSGID: =?utf-8?q?1755689157992717597?= From: Tianyu Lan Hypervisor needs to access iput arg page and guest should decrypt the page. Signed-off-by: Tianyu Lan --- Change since RFC V2: * Set inputarg to be zero after kfree() * Not free mem when fail to encrypt mem in the hv_common_cpu_die(). --- drivers/hv/hv_common.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index f788c64de0bd..205b6380d794 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -125,6 +126,7 @@ int hv_common_cpu_init(unsigned int cpu) u64 msr_vp_index; gfp_t flags; int pgcount = hv_root_partition ? 2 : 1; + int ret; /* hv_cpu_init() can be called with IRQs disabled from hv_resume() */ flags = irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL; @@ -134,6 +136,17 @@ int hv_common_cpu_init(unsigned int cpu) if (!(*inputarg)) return -ENOMEM; + if (hv_isolation_type_en_snp()) { + ret = set_memory_decrypted((unsigned long)*inputarg, pgcount); + if (ret) { + kfree(*inputarg); + *inputarg = NULL; + return ret; + } + + memset(*inputarg, 0x00, PAGE_SIZE); + } + if (hv_root_partition) { outputarg = (void **)this_cpu_ptr(hyperv_pcpu_output_arg); *outputarg = (char *)(*inputarg) + HV_HYP_PAGE_SIZE; @@ -168,7 +181,12 @@ int hv_common_cpu_die(unsigned int cpu) local_irq_restore(flags); - kfree(mem); + if (hv_isolation_type_en_snp()) { + if (!set_memory_encrypted((unsigned long)mem, 1)) + kfree(mem); + } else { + kfree(mem); + } return 0; }