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 sd7OTUpf qhembOxajpJTYXmuVphb5VunOwHBXuEFUkQlsF1znbw7Mri8F6YGLwwCb+z37ueUehTnoqmqzqHsO7lo/KrRygccmM7uO2fZzsVzNMm5/PqQVSWwp5dVVNiqvgphGdAILsrK5Gpv8Fpxcpk2acmARb9bPQcir1i25WD54LkbPYk+7JMlJddsxWpbvuY1QjjWouSFx2RqdeIwq8MI= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 11/8/2023 12:14 AM, Borislav Petkov wrote: > On Tue, Nov 07, 2023 at 04:33:41PM -0600, Kalra, Ashish wrote: >> We will still need some method to tell the IOMMU driver if SNP >> support/feature is disabled by this function, for example, when CPU family >> and model is not supported by SNP and we jump to no_snp label. > > See below. > >> The reliable way for this to work is to ensure snp_rmptable_init() is called >> before IOMMU initialization and then IOMMU initialization depends on SNP >> feature flag setup by snp_rmptable_init() to enable SNP support on IOMMU or >> not. > > Yes, this whole SNP initialization needs to be reworked and split this > way: > > - early detection work which needs to be done once goes to > bsp_init_amd(): that's basically your early_detect_mem_encrypt() stuff > which needs to happen exactly only once and early. > > - Any work like: > > c->x86_phys_bits -= (cpuid_ebx(0x8000001f) >> 6) & 0x3f; > > and the like which needs to happen on each AP, gets put in a function > which gets called by init_amd(). > > By the time IOMMU gets to init, you already know whether it should > enable SNP and check X86_FEATURE_SEV_SNP. > > Finally, you call __snp_rmptable_init() which does the *per-CPU* init > work which is still pending. > > Ok? Yes, will need to rework the SNP initialization stuff, the important point is that we want to do snp_rmptable_init() stuff before IOMMU initialization as for things like RMP table not correctly setup, etc., we don't want IOMMU initialization to enable SNP on the IOMMUs. Thanks, Ashish