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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2023 18:44:56.9088 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 26894fc4-1c33-4779-bf79-08db1372903a X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT090.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7754 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org This information will be useful for debugging things like page faults due to RMP access violations and RMPUPDATE failures. 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.h | 2 ++ arch/x86/kernel/sev.c | 48 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+) diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index 8d3ce2ad27da..edbb7fa488af 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -198,6 +198,7 @@ bool snp_init(struct boot_params *bp); void __init __noreturn snp_abort(void); int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, unsigned long *fw_err); int snp_lookup_rmpentry(u64 pfn, int *level); +void sev_dump_rmpentry(u64 pfn); #else static inline void sev_es_ist_enter(struct pt_regs *regs) { } static inline void sev_es_ist_exit(void) { } @@ -223,6 +224,7 @@ static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *in return -ENOTTY; } static inline int snp_lookup_rmpentry(u64 pfn, int *level) { return 0; } +static inline void sev_dump_rmpentry(u64 pfn) {} #endif #endif diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index a063c1b98034..a01741c4a1b8 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -2504,6 +2504,54 @@ static struct rmpentry *__snp_lookup_rmpentry(u64 pfn, int *level) return entry; } +void sev_dump_rmpentry(u64 pfn) +{ + unsigned long pfn_end; + struct rmpentry *e; + int level; + + e = __snp_lookup_rmpentry(pfn, &level); + if (IS_ERR(e)) { + pr_info("Failed to read RMP entry for PFN 0x%llx\n", pfn); + return; + } + + if (rmpentry_assigned(e)) { + pr_info("RMPEntry paddr 0x%llx [assigned=%d immutable=%d pagesize=%d gpa=0x%lx asid=%d vmsa=%d validated=%d]\n", + pfn << PAGE_SHIFT, rmpentry_assigned(e), e->info.immutable, + rmpentry_pagesize(e), (unsigned long)e->info.gpa, e->info.asid, + e->info.vmsa, e->info.validated); + + /* Dump all the non-zero entries if debug enabled */ + if (!sev_cfg.debug) + return; + } + + /* + * If the RMP entry at the faulting pfn was not assigned, then not sure + * what caused the RMP violation. To get some useful debug information, + * iterate through the entire 2MB region, and dump the RMP entries if + * one of the bit in the RMP entry is set. + */ + pfn = pfn & ~(PTRS_PER_PMD - 1); + pfn_end = pfn + PTRS_PER_PMD; + + while (pfn < pfn_end) { + e = __snp_lookup_rmpentry(pfn, &level); + if (IS_ERR(e)) { + pr_info("Failed to read RMP entry for PFN 0x%llx\n", pfn); + pfn++; + continue; + } + + if (e->low || e->high) + pr_info("RMPEntry paddr 0x%llx: [high=0x%016llx low=0x%016llx]\n", + pfn << PAGE_SHIFT, e->high, e->low); + pfn++; + } +} +EXPORT_SYMBOL_GPL(sev_dump_rmpentry); + /* * Return 1 if the RMP entry is assigned, 0 if it exists but is not assigned, * and -errno if there is no corresponding RMP entry.