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In v11 (as i mentioned) this will be a small local helper, it will also handles two things >> the cap-clear can't: >> - a contiguous (non-segmented) RMP, where RMPOPT isn't usable even with X86_FEATURE_RMPOPT set. >> - SNP being disabled at runtime (CC_ATTR_HOST_SEV_SNP). >> >> static bool rmpopt_capable(void) >> { >> return cpu_feature_enabled(X86_FEATURE_RMPOPT) && >> cc_platform_has(CC_ATTR_HOST_SEV_SNP) && > > CC_ATTR_HOST_SEV_SNP is set from bsp_determine_snp() ... > >> (rmp_cfg & MSR_AMD64_SEG_RMP_ENABLED) && > > ... and that already checks snp_probe_rmptable_info() ... > >> rmp_segment_table; > > .. and if iommu_snp_enable() fails snp_rmptable_init(), we clear > CC_ATTR_HOST_SEV_SNP. > > So, the way I see it, CC_ATTR_HOST_SEV_SNP being set means we have > already tried provisioning RMP table. Agreed, and that makes rmp_segment_table redundant — iommu_snp_enable() clears CC_ATTR_HOST_SEV_SNP when snp_rmptable_init() fails, so the attr being set already implies rmp_segment_table != NULL. I'll drop it. The one I'd keep is (rmp_cfg & MSR_AMD64_SEG_RMP_ENABLED). It's a runtime config bit, not the CPUID feature: setup_rmptable() allocates rmp_segment_table and keeps CC_ATTR_HOST_SEV_SNP set for both segmented and contiguous RMP, so the MSR bit is the only thing that distinguishes them — and RMPOPT needs a segmented RMP. Clearing X86_FEATURE_RMPOPT in snp_rmptable_init() won't work on its own as i mentioned in this reply earlier: it runs at rootfs_initcall, after alternative_instructions(), so cpu_feature_enabled() keeps returning true off the already-patched static_cpu_has(). So the helper becomes: static bool rmpopt_capable(void) { return cpu_feature_enabled(X86_FEATURE_RMPOPT) && cc_platform_has(CC_ATTR_HOST_SEV_SNP) && (rmp_cfg & MSR_AMD64_SEG_RMP_ENABLED); } Thanks, Ashish > > I'm assuming all platforms that have X86_FEATURE_RMPOPT will all have > segmented RMP. If not, you can just clear X86_FEATURE_RMPOPT in > snp_rmptable_init() no? > > We can never reach functions that need rmpopt_capable() without > first checking CC_ATTR_HOST_SEV_SNP. >