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Wed, 16 Nov 2022 18:42:32 +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 05/14] x86/mm: Handle decryption/re-encryption of bss_decrypted consistently Date: Wed, 16 Nov 2022 10:41:28 -0800 Message-Id: <1668624097-14884-6-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> X-ClientProxiedBy: MW4PR03CA0178.namprd03.prod.outlook.com (2603:10b6:303:8d::33) To DM6PR21MB1370.namprd21.prod.outlook.com (2603:10b6:5:16b::28) 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: 57a8e9ba-f984-4329-3e68-08dac8025291 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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But code in mem_encrypt_free_decrytped_mem() re-encrypts the unused portion based on CC_ATTR_MEM_ENCRYPT. In a Hyper-V guest VM using vTOM, these conditions are not equivalent as sme_me_mask is always zero when using vTOM. Consequently, mem_encrypt_free_decrypted_mem() attempts to re-encrypt memory that was never decrypted. Fix this in mem_encrypt_free_decrypted_mem() by conditioning the re-encryption on the same test for non-zero sme_me_mask. Hyper-V guests using vTOM don't need the bss_decrypted section to be decrypted, so skipping the decryption/re-encryption doesn't cause a problem. Signed-off-by: Michael Kelley Reviewed-by: Tom Lendacky --- arch/x86/mm/mem_encrypt_amd.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/x86/mm/mem_encrypt_amd.c b/arch/x86/mm/mem_encrypt_amd.c index 9c4d8db..5a51343 100644 --- a/arch/x86/mm/mem_encrypt_amd.c +++ b/arch/x86/mm/mem_encrypt_amd.c @@ -513,10 +513,14 @@ void __init mem_encrypt_free_decrypted_mem(void) npages = (vaddr_end - vaddr) >> PAGE_SHIFT; /* - * The unused memory range was mapped decrypted, change the encryption - * attribute from decrypted to encrypted before freeing it. + * If the unused memory range was mapped decrypted, change the encryption + * attribute from decrypted to encrypted before freeing it. Base the + * re-encryption on the same condition used for the decryption in + * sme_postprocess_startup(). Higher level abstractions, such as + * CC_ATTR_MEM_ENCRYPT, aren't necessarily equivalent in a Hyper-V VM + * using vTOM, where sme_me_mask is always zero. */ - if (cc_platform_has(CC_ATTR_MEM_ENCRYPT)) { + if (sme_get_me_mask()) { r = set_memory_encrypted(vaddr, npages); if (r) { pr_warn("failed to free unused decrypted pages\n");