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Received: from DM6PR21MB1370.namprd21.prod.outlook.com (2603:10b6:5:16b::28) by DM4PR21MB3130.namprd21.prod.outlook.com (2603:10b6:8:63::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5857.5; Wed, 16 Nov 2022 18:42:44 +0000 Received: from DM6PR21MB1370.namprd21.prod.outlook.com ([fe80::c3e3:a6ef:232c:299b]) by DM6PR21MB1370.namprd21.prod.outlook.com ([fe80::c3e3:a6ef:232c:299b%9]) with mapi id 15.20.5857.005; Wed, 16 Nov 2022 18:42:44 +0000 From: Michael Kelley To: hpa@zytor.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, luto@kernel.org, peterz@infradead.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, lpieralisi@kernel.org, robh@kernel.org, kw@linux.com, bhelgaas@google.com, arnd@arndb.de, hch@infradead.org, m.szyprowski@samsung.com, robin.murphy@arm.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, Tianyu.Lan@microsoft.com, kirill.shutemov@linux.intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, ak@linux.intel.com, isaku.yamahata@intel.com, dan.j.williams@intel.com, jane.chu@oracle.com, seanjc@google.com, tony.luck@intel.com, x86@kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, iommu@lists.linux.dev Cc: mikelley@microsoft.com Subject: [Patch v3 10/14] Drivers: hv: vmbus: Remove second way of mapping ring buffers Date: Wed, 16 Nov 2022 10:41:33 -0800 Message-Id: <1668624097-14884-11-git-send-email-mikelley@microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1668624097-14884-1-git-send-email-mikelley@microsoft.com> References: <1668624097-14884-1-git-send-email-mikelley@microsoft.com> Content-Type: text/plain X-ClientProxiedBy: MW4PR03CA0178.namprd03.prod.outlook.com (2603:10b6:303:8d::33) To DM6PR21MB1370.namprd21.prod.outlook.com (2603:10b6:5:16b::28) Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR21MB1370:EE_|DM4PR21MB3130:EE_ X-MS-Office365-Filtering-Correlation-Id: c463e26e-e919-4e4e-75ec-08dac8025966 X-LD-Processed: 72f988bf-86f1-41af-91ab-2d7cd011db47,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?DNwxNa8l5HwJjWNmhKtgao9kHWkuHA9NhvTCIGiZQgVsr9BKSNAI66VbyGFB?= =?us-ascii?Q?UNUIEJ103jyZkozujnLRTr9uziaeNntdZthGUaUsggfI6Ey+qqaeskGmh9pl?= =?us-ascii?Q?ZBbIPemXBjw8fSpvkCvwfwVyCGQDUt5rrjW/Pj4A9h6VcugKzMDyVYP12tVf?= =?us-ascii?Q?o0+7T/pkLVAF8TJm7L5I+Tb3FGzsrJR+9jmbHWExQtVJihNZdhBKuwc3FvYp?= =?us-ascii?Q?3qQQzia3LG4hyU45hg9BSXJRYoXDgIMSuSPekriqqyaYlrK8n9SsxU3vkOuL?= =?us-ascii?Q?luwFZ/pMjF6yrV9OVkpmwsh1F02uymcmkFIjXCoWwJwDx0rUgeZ1je6n8hQ9?= =?us-ascii?Q?yn5m+c230nWyPaJvntHk/2LslwrhsYdZu0C+ibqAt0R/ZdotAM7NR1mE11pI?= =?us-ascii?Q?aEHxxktGK3lv4kNkFUhIiTB+i2/RwdM3X92x/UDPezcF/9khHAOsaf1dsFDp?= =?us-ascii?Q?F4wkFMxVVFxVIsehD+DVOWyYChcxI4GxNDsYh0rveKWBkf1t8RL4KNBfWjSu?= =?us-ascii?Q?rpJ5F+pENbL0c9t9nHg4vt6YykynGzxxUtu7ilDGzY9PK/94SDndeJRzlxFf?= =?us-ascii?Q?7tncRGmVERN5Ce9BI4LNFoSkZKy59w7I1BmeeJfS+PcFSIjJj/SAuQSkYHu8?= =?us-ascii?Q?gBBxaauf8d/5EACHFDgoFSGRuKjeZLtWk9R4l1Tg7okGxnqvEymVrl5Uxme0?= =?us-ascii?Q?z84vccyWRki9RYM/ad7kb3kV4sWjL1eQwiG0LltWCYeGnQ7rG4ysIeb8j6I2?= =?us-ascii?Q?5kRk5JcSTmzK8u/s6IMqJuqSszLcrh0KsLF2O/Qs5QfBi9M8J2SdWH+e+k2m?= =?us-ascii?Q?1sLSfZRYTFGw25NNfHSd62r2icsVEVFa+kk7x+2kognXr676lXigYz5JKFW/?= =?us-ascii?Q?4l0zHuzDF/f9M8p4ykqCyTapPVZfqD1T9mb7g3Mo12LLTDZ+v7zbbkTy1Udm?= =?us-ascii?Q?vKMJVQdIKRD8ZKC4wzhIhHDoog87nzVWYQTLGN5UQxnOsc7YtjqAo4W8A1j5?= =?us-ascii?Q?pvbj5JRmwFxxIp80/AWpBnr5YGlRnNrRLEs9fLbxI7aKp/ln5O8uhUwaRQOn?= =?us-ascii?Q?Z3wiQZC/WfZrtCFDkkx3wFGhUX/5TFapWaI6/CO2qaR5UozVMiolTavwFOAz?= =?us-ascii?Q?73D7tYLjpLVqj1GdyUO4i/3ZlJQtPiilI/nyzQ9YJoKDjeS59zxl74djpzsh?= =?us-ascii?Q?K89fZRfuQrDWqnZN+h5ASDEyk+aA3YOojkdTrNuZXIbzyR7EpZ20Gv6DLcnl?= =?us-ascii?Q?yUpQ8k5yVpfo9tzxZnKoghzNtgsIJ9zYkAFfof1wT0XSP1aAQ8hOeDIzOnmP?= =?us-ascii?Q?Uzsk643GPgAjZVS/n5mmJqBSPYrV5mOaJh/KQZy46KXxO1C8i3hC71D4t8WJ?= =?us-ascii?Q?ua2PTD81YrTFxYoAY4fZzCtEFbo65wZnp+o0jq0NWP7k0kPs/NUljLGC/xjH?= =?us-ascii?Q?3JHmaFSWBiJo4SPMaqusHRGFjg3M1xPY/Oh5LmH1OMCMbigMJBPJCqBUdBrh?= =?us-ascii?Q?My9qZ3Es8PANJhsAVoKhwMIB/BuU1wlV7s0ioI5fPU1pEcpqG+nCIWPsogSe?= =?us-ascii?Q?L7++1K1FiTxRSbdbZZfu4u3GgABEk+oUw/dBll2R?= X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: c463e26e-e919-4e4e-75ec-08dac8025966 X-MS-Exchange-CrossTenant-AuthSource: DM6PR21MB1370.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Nov 2022 18:42:44.4066 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Sw+Q+fLus9916g6c/myAfCnY2uzty6PdlsJJGcOT7CXr/3EjWzDRVo0bY9mTEA9JJztaR98GT/QYZx2aaRkpNw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR21MB3130 With changes to how Hyper-V guest VMs flip memory between private (encrypted) and shared (decrypted), it's no longer necessary to have separate code paths for mapping VMBus ring buffers for for normal VMs and for Confidential VMs. As such, remove the code path that uses vmap_pfn(), and set the protection flags argument to vmap() to account for the difference between normal and Confidential VMs. Signed-off-by: Michael Kelley Reviewed-by: Tianyu Lan --- drivers/hv/ring_buffer.c | 62 ++++++++++++++++-------------------------------- 1 file changed, 20 insertions(+), 42 deletions(-) diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index b4a91b1..20a0631 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -186,8 +186,6 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, struct page *pages, u32 page_cnt, u32 max_pkt_size) { struct page **pages_wraparound; - unsigned long *pfns_wraparound; - u64 pfn; int i; BUILD_BUG_ON((sizeof(struct hv_ring_buffer) != PAGE_SIZE)); @@ -196,50 +194,30 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, * First page holds struct hv_ring_buffer, do wraparound mapping for * the rest. */ - if (hv_isolation_type_snp()) { - pfn = page_to_pfn(pages) + - PFN_DOWN(ms_hyperv.shared_gpa_boundary); + pages_wraparound = kcalloc(page_cnt * 2 - 1, + sizeof(struct page *), + GFP_KERNEL); + if (!pages_wraparound) + return -ENOMEM; - pfns_wraparound = kcalloc(page_cnt * 2 - 1, - sizeof(unsigned long), GFP_KERNEL); - if (!pfns_wraparound) - return -ENOMEM; - - pfns_wraparound[0] = pfn; - for (i = 0; i < 2 * (page_cnt - 1); i++) - pfns_wraparound[i + 1] = pfn + i % (page_cnt - 1) + 1; - - ring_info->ring_buffer = (struct hv_ring_buffer *) - vmap_pfn(pfns_wraparound, page_cnt * 2 - 1, - pgprot_decrypted(PAGE_KERNEL_NOENC)); - kfree(pfns_wraparound); - - if (!ring_info->ring_buffer) - return -ENOMEM; - - /* Zero ring buffer after setting memory host visibility. */ - memset(ring_info->ring_buffer, 0x00, PAGE_SIZE * page_cnt); - } else { - pages_wraparound = kcalloc(page_cnt * 2 - 1, - sizeof(struct page *), - GFP_KERNEL); - if (!pages_wraparound) - return -ENOMEM; - - pages_wraparound[0] = pages; - for (i = 0; i < 2 * (page_cnt - 1); i++) - pages_wraparound[i + 1] = - &pages[i % (page_cnt - 1) + 1]; + pages_wraparound[0] = pages; + for (i = 0; i < 2 * (page_cnt - 1); i++) + pages_wraparound[i + 1] = + &pages[i % (page_cnt - 1) + 1]; - ring_info->ring_buffer = (struct hv_ring_buffer *) - vmap(pages_wraparound, page_cnt * 2 - 1, VM_MAP, - PAGE_KERNEL); + ring_info->ring_buffer = (struct hv_ring_buffer *) + vmap(pages_wraparound, page_cnt * 2 - 1, VM_MAP, + pgprot_decrypted(PAGE_KERNEL_NOENC)); - kfree(pages_wraparound); - if (!ring_info->ring_buffer) - return -ENOMEM; - } + kfree(pages_wraparound); + if (!ring_info->ring_buffer) + return -ENOMEM; + /* + * Ensure the header page is zero'ed since + * encryption status may have changed. + */ + memset(ring_info->ring_buffer, 0, HV_HYP_PAGE_SIZE); ring_info->ring_buffer->read_index = ring_info->ring_buffer->write_index = 0; -- 1.8.3.1