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Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra [mdr: move helper to standalone patch] Signed-off-by: Michael Roth --- arch/x86/include/asm/sev-host.h | 2 + arch/x86/virt/svm/sev.c | 77 +++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+) diff --git a/arch/x86/include/asm/sev-host.h b/arch/x86/include/asm/sev-host.h index 4c487ce8457f..bb06c57f2909 100644 --- a/arch/x86/include/asm/sev-host.h +++ b/arch/x86/include/asm/sev-host.h @@ -15,8 +15,10 @@ #ifdef CONFIG_KVM_AMD_SEV int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level); +void sev_dump_hva_rmpentry(unsigned long address); #else static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENXIO; } +static inline void sev_dump_hva_rmpentry(unsigned long address) {} #endif #endif diff --git a/arch/x86/virt/svm/sev.c b/arch/x86/virt/svm/sev.c index 7d3802605376..cac3e311c38f 100644 --- a/arch/x86/virt/svm/sev.c +++ b/arch/x86/virt/svm/sev.c @@ -290,3 +290,80 @@ int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) return 0; } EXPORT_SYMBOL_GPL(snp_lookup_rmpentry); + +/* + * Dump the raw RMP entry for a particular PFN. These bits are documented in the + * PPR for a particular CPU model and provide useful information about how a + * particular PFN is being utilized by the kernel/firmware at the time certain + * unexpected events occur, such as RMP faults. + */ +static void sev_dump_rmpentry(u64 dumped_pfn) +{ + struct rmpentry e; + u64 pfn, pfn_end; + int level, ret; + u64 *e_data; + + ret = __snp_lookup_rmpentry(dumped_pfn, &e, &level); + if (ret) { + pr_info("Failed to read RMP entry for PFN 0x%llx, error %d\n", + dumped_pfn, ret); + return; + } + + e_data = (u64 *)&e; + if (e.assigned) { + pr_info("RMP entry for PFN 0x%llx: [high=0x%016llx low=0x%016llx]\n", + dumped_pfn, e_data[1], e_data[0]); + return; + } + + /* + * If the RMP entry for a particular PFN is not in an assigned state, + * then it is sometimes useful to get an idea of whether or not any RMP + * entries for other PFNs within the same 2MB region are assigned, since + * those too can affect the ability to access a particular PFN in + * certain situations, such as when the PFN is being accessed via a 2MB + * mapping in the host page table. + */ + pfn = ALIGN(dumped_pfn, PTRS_PER_PMD); + pfn_end = pfn + PTRS_PER_PMD; + + while (pfn < pfn_end) { + ret = __snp_lookup_rmpentry(pfn, &e, &level); + if (ret) { + pr_info_ratelimited("Failed to read RMP entry for PFN 0x%llx\n", pfn); + pfn++; + continue; + } + + if (e_data[0] || e_data[1]) { + pr_info("No assigned RMP entry for PFN 0x%llx, but the 2MB region contains populated RMP entries, e.g.: PFN 0x%llx: [high=0x%016llx low=0x%016llx]\n", + dumped_pfn, pfn, e_data[1], e_data[0]); + return; + } + pfn++; + } + + pr_info("No populated RMP entries in the 2MB region containing PFN 0x%llx\n", + dumped_pfn); +} + +void sev_dump_hva_rmpentry(unsigned long hva) +{ + unsigned int level; + pgd_t *pgd; + pte_t *pte; + + pgd = __va(read_cr3_pa()); + pgd += pgd_index(hva); + pte = lookup_address_in_pgd(pgd, hva, &level); + + if (pte) { + pr_info("Can't dump RMP entry for HVA %lx: no PTE/PFN found\n", hva); + return; + } + + sev_dump_rmpentry(pte_pfn(*pte)); +} +EXPORT_SYMBOL_GPL(sev_dump_hva_rmpentry);