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David Alan Gilbert" , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH v8 12/40] x86/sev: Add helper for validating pages in early enc attribute changes To: Venu Busireddy References: <20211210154332.11526-1-brijesh.singh@amd.com> <20211210154332.11526-13-brijesh.singh@amd.com> From: Brijesh Singh Message-ID: <7934f88f-8e2b-ea45-6110-202ea8c2ad64@amd.com> Date: Tue, 11 Jan 2022 15:22:01 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: CH0PR03CA0365.namprd03.prod.outlook.com (2603:10b6:610:119::13) To DM6PR12MB2714.namprd12.prod.outlook.com (2603:10b6:5:42::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8b457931-2d7f-4945-0179-08d9d5486a61 X-MS-TrafficTypeDiagnostic: DM6PR12MB3657:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; 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While at it, you may want to collapse it into a one > line comment. > Based on previous review feedback I tried to keep the comment to 80 character limit. >> + early_set_page_state(paddr, npages, SNP_PAGE_STATE_PRIVATE); >> + >> + /* Validate the memory pages after they've been added in the RMP table. */ >> + pvalidate_pages(vaddr, npages, 1); >> +} >> + >> +void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, >> + unsigned int npages) >> +{ >> + if (!cc_platform_has(CC_ATTR_SEV_SNP)) >> + return; >> + >> + /* >> + * Invalidate the memory pages before they are marked shared in the >> + * RMP table. >> + */ > > Collapse into one line? > same as above. ... >> + /* >> + * ON SNP, the page state in the RMP table must happen >> + * before the page table updates. >> + */ >> + early_snp_set_memory_shared((unsigned long)__va(pa), pa, 1); > > I know "1" implies "true", but to emphasize that the argument is > actually a boolean, could you please change the "1" to "true?" > I assume you mean the last argument to the early_snp_set_memory_{private,shared}. Please note that its a number of pages (unsigned int). The 'true' does not make sense to me. >> + } >> + >> /* Change the page encryption mask. */ >> new_pte = pfn_pte(pfn, new_prot); >> set_pte_atomic(kpte, new_pte); >> + >> + /* >> + * If page is set encrypted in the page table, then update the RMP table to >> + * add this page as private. >> + */ >> + if (enc) >> + early_snp_set_memory_private((unsigned long)__va(pa), pa, 1); > > Here too, could you please change the "1" to "true?" > same as above. thanks