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bh=eHfQ2xg7TSoUMJoNFBa3Rt6P1l7onXyfXsIWqOdHwnM=; b=L+X2+X/21Qy++Ah1vVGwZ+DObeOIB9mfh+Q1C+DSUO3jrHY21IC92ZwlCF+zK2+/e0 81SG5EuLORYBtlECmhWQE3dZaBL/6Wv8JZCtYiHwWB+bjGxbnud/GqY2Hg4Mbwl+5C5k ernDPY8WpjFrChXhevEQw480korWiTDjgerLQT42ihQ2JI4TP4AgEkn2CQOZB/WGaDDg ILhcMb4k1aimx2zr5Aw8JFqqXlnUlBWVTgWnu1JP1Rmwk03xKuM7+qhkQ9nOlumRb62b 5CQDUY7lz9BwE6qbWl1xtGMp7ERje1a9hlz5eErgKUQY4HWbJ6EHSqPsroHwYxz4EgmC nfOQ== X-Gm-Message-State: ACrzQf3rvB9zYjQgnB2Vx8PSSKCTwiqqSP4dkRx9+rwFTBIkx4xYtR7X izZglTbAk5UheEH5JqDgUtw= X-Received: by 2002:a17:902:7688:b0:187:403c:7a2b with SMTP id m8-20020a170902768800b00187403c7a2bmr43513901pll.85.1668027253050; Wed, 09 Nov 2022 12:54:13 -0800 (PST) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:a:c616:2003:6c97:8057]) by smtp.gmail.com with ESMTPSA id c2-20020a17090a108200b002137d3da760sm1633984pja.39.2022.11.09.12.54.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Nov 2022 12:54:12 -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 12/17] Drivers: hv: vmbus: Decrypt vmbus ring buffer Date: Wed, 9 Nov 2022 15:53:47 -0500 Message-Id: <20221109205353.984745-13-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221109205353.984745-1-ltykernel@gmail.com> References: <20221109205353.984745-1-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?1749053559935888259?= X-GMAIL-MSGID: =?utf-8?q?1749053559935888259?= From: Tianyu Lan The ring buffer is remapped in the hv_ringbuffer_init() and it should be with decrypt flag in order to share it with hypervisor in sev-snp enlightened guest. Signed-off-by: Tianyu Lan --- drivers/hv/ring_buffer.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index 59a4aa86d1f3..391995c76be7 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include "hyperv_vmbus.h" @@ -233,14 +234,18 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, ring_info->ring_buffer = (struct hv_ring_buffer *) vmap(pages_wraparound, page_cnt * 2 - 1, VM_MAP, + hv_isolation_type_en_snp() ? + pgprot_decrypted(PAGE_KERNEL_NOENC) : PAGE_KERNEL); + if (hv_isolation_type_en_snp()) + memset(ring_info->ring_buffer, 0x00, page_cnt * PAGE_SIZE); + kfree(pages_wraparound); if (!ring_info->ring_buffer) return -ENOMEM; } - ring_info->ring_buffer->read_index = ring_info->ring_buffer->write_index = 0;