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David Alan Gilbert" , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH v8 13/40] x86/kernel: Make the bss.decrypted section shared in RMP table Message-ID: References: <20211210154332.11526-1-brijesh.singh@amd.com> <20211210154332.11526-14-brijesh.singh@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211210154332.11526-14-brijesh.singh@amd.com> X-ClientProxiedBy: SA0PR11CA0057.namprd11.prod.outlook.com (2603:10b6:806:d0::32) To SN6PR10MB2576.namprd10.prod.outlook.com (2603:10b6:805:44::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 95e79e83-aeb6-4036-137d-08d9cfab86c6 X-MS-TrafficTypeDiagnostic: SN6PR10MB2462:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR10MB2576.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(7916004)(366004)(6916009)(316002)(33716001)(6486002)(186003)(6666004)(86362001)(44832011)(54906003)(508600001)(4001150100001)(4326008)(7406005)(7416002)(66946007)(6512007)(8936002)(66556008)(2906002)(83380400001)(66476007)(38100700002)(53546011)(26005)(6506007)(8676002)(9686003)(5660300002);DIR:OUT;SFP:1101; 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This is because the section contains the data > that need to be shared between the guest and the hypervisor. > > When SEV-SNP is active, just clearing the encryption attribute in the > page table is not enough. The page state need to be updated in the RMP > table. > > Signed-off-by: Brijesh Singh > --- > arch/x86/kernel/head64.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c > index fa02402dcb9b..72c5082a3ba4 100644 > --- a/arch/x86/kernel/head64.c > +++ b/arch/x86/kernel/head64.c > @@ -143,7 +143,14 @@ static unsigned long sme_postprocess_startup(struct boot_params *bp, pmdval_t *p > if (sme_get_me_mask()) { > vaddr = (unsigned long)__start_bss_decrypted; > vaddr_end = (unsigned long)__end_bss_decrypted; > + > for (; vaddr < vaddr_end; vaddr += PMD_SIZE) { > + /* > + * When SEV-SNP is active then transition the page to shared in the RMP > + * table so that it is consistent with the page table attribute change. > + */ > + early_snp_set_memory_shared(__pa(vaddr), __pa(vaddr), PTRS_PER_PMD); Shouldn't the first argument be vaddr as below? early_snp_set_memory_shared(vaddr, __pa(vaddr), PTRS_PER_PMD); Venu