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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jun 2023 04:53:32.9292 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e5dfa6b3-63fc-4e73-ad9b-08db6b00f95a 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: CY4PEPF0000E9DB.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4033 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Implement a platform hook to do the work of restoring the direct map entries of gmem-managed pages and transitioning the corresponding RMP table entries back to the default shared/hypervisor-owned state. Signed-off-by: Michael Roth --- arch/x86/kvm/svm/sev.c | 43 ++++++++++++++++++++++++++++++++++++++++++ arch/x86/kvm/svm/svm.c | 1 + arch/x86/kvm/svm/svm.h | 1 + 3 files changed, 45 insertions(+) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index c5a1706387bf..543926fa3200 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -4117,3 +4117,46 @@ int sev_gmem_prepare(struct kvm *kvm, struct kvm_memory_slot *slot, return rc; } + +void sev_gmem_invalidate(struct kvm *kvm, kvm_pfn_t start, kvm_pfn_t end) +{ + kvm_pfn_t pfn; + + if (!sev_snp_guest(kvm)) + return; + + pr_debug("%s: kvm %p pfn 0x%llx pfn_end 0x%llx\n", + __func__, kvm, start, end); + + for (pfn = start; pfn < end; pfn++) { + int rc, rmp_level; + bool assigned; + + rc = snp_lookup_rmpentry(pfn, &assigned, &rmp_level); + if (rc) { + pr_warn_ratelimited("SEV: Failed to retrieve RMP entry for PFN 0x%llx error %d\n", + pfn, rc); + continue; + } + + if (!assigned) + continue; + + /* + * If PFN is currently assigned as a 2M page, PSMASH it into + * individual 4K RMP entries before attempting to convert a + * 4K sub-page. + */ + if (rmp_level > PG_LEVEL_4K) { + rc = snp_rmptable_psmash(kvm, pfn); + if (rc) + pr_warn_ratelimited("SEV: Failed to PSMASH RMP entry for PFN 0x%llx error %d\n", + pfn, rc); + } + + rc = rmp_make_shared(pfn, PG_LEVEL_4K); + if (rc) + pr_warn_ratelimited("SEV: Failed to update RMP entry for PFN 0x%llx error %d\n", + pfn, rc); + } +} diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 9085a122907c..1390e47d0aa5 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4936,6 +4936,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = { .alloc_apic_backing_page = svm_alloc_apic_backing_page, .gmem_prepare = sev_gmem_prepare, + .gmem_invalidate = sev_gmem_invalidate, }; /* diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 0438f52e4396..0d4c29a4300a 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -772,6 +772,7 @@ void handle_rmp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u64 error_code); void sev_snp_init_protected_guest_state(struct kvm_vcpu *vcpu); int sev_gmem_prepare(struct kvm *kvm, struct kvm_memory_slot *slot, kvm_pfn_t pfn, gfn_t gfn, u8 *max_level); +void sev_gmem_invalidate(struct kvm *kvm, kvm_pfn_t start, kvm_pfn_t end); /* vmenter.S */