From: Michael Roth <michael.roth@amd.com>
To: <kvm@vger.kernel.org>
Cc: <linux-coco@lists.linux.dev>, <linux-mm@kvack.org>,
<linux-crypto@vger.kernel.org>, <x86@kernel.org>,
<linux-kernel@vger.kernel.org>, <tglx@linutronix.de>,
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<hpa@zytor.com>, <ardb@kernel.org>, <pbonzini@redhat.com>,
<seanjc@google.com>, <vkuznets@redhat.com>, <jmattson@google.com>,
<luto@kernel.org>, <dave.hansen@linux.intel.com>,
<slp@redhat.com>, <pgonda@google.com>, <peterz@infradead.org>,
<srinivas.pandruvada@linux.intel.com>, <rientjes@google.com>,
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<tony.luck@intel.com>, <marcorr@google.com>,
<sathyanarayanan.kuppuswamy@linux.intel.com>,
<alpergun@google.com>, <dgilbert@redhat.com>, <jarkko@kernel.org>,
<ashish.kalra@amd.com>, <nikunj.dadhania@amd.com>,
<liam.merwick@oracle.com>, <zhi.a.wang@intel.com>
Subject: [PATCH RFC v9 44/51] KVM: SEV: Implement gmem hook for initializing private pages
Date: Sun, 11 Jun 2023 23:25:52 -0500 [thread overview]
Message-ID: <20230612042559.375660-45-michael.roth@amd.com> (raw)
In-Reply-To: <20230612042559.375660-1-michael.roth@amd.com>
This will handle RMP table updates and direct map changes needed to put
a page into a private state before mapping it into an SEV-SNP guest.
Signed-off-by: Michael Roth <michael.roth@amd.com>
---
arch/x86/kvm/svm/sev.c | 95 ++++++++++++++++++++++++++++++++++++++++++
arch/x86/kvm/svm/svm.c | 2 +
arch/x86/kvm/svm/svm.h | 2 +
3 files changed, 99 insertions(+)
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 909ecd90d199..c5a1706387bf 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -4022,3 +4022,98 @@ void handle_rmp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u64 error_code)
kvm_zap_gfn_range(kvm, gfn, gfn + PTRS_PER_PMD);
put_page(pfn_to_page(pfn));
}
+
+/* Check if GFN range is marked private in the KVM/gmem xarray. */
+static bool is_gfn_range_private(struct kvm *kvm, gfn_t start, gfn_t end)
+{
+ gfn_t gfn = start;
+
+ while (gfn++ < end)
+ if (!kvm_mem_is_private(kvm, gfn)) {
+ pr_debug("%s: overlap detected, GFN 0x%llx start 0x%llx end 0x%llx\n",
+ __func__, gfn, start, end);
+ return false;
+ }
+
+ return true;
+}
+
+/* Check that no pages in PFN range have already been set to private in RMP table. */
+static bool is_pfn_range_shared(kvm_pfn_t start, kvm_pfn_t end)
+{
+ kvm_pfn_t pfn = start;
+
+ while (pfn++ < end) {
+ int ret, rmp_level;
+ bool assigned;
+
+ ret = snp_lookup_rmpentry(pfn, &assigned, &rmp_level);
+ if (ret) {
+ pr_debug("%s: failed to retrieve RMP entry, assuming overlap, PFN 0x%llx start 0x%llx end 0x%llx RMP level %d error %d\n",
+ __func__, pfn, start, end, rmp_level, ret);
+ return false;
+ }
+
+ if (assigned == 1) {
+ pr_debug("%s: overlap detected, PFN 0x%llx start 0x%llx end 0x%llx RMP level %d\n",
+ __func__, pfn, start, end, rmp_level);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static int get_supported_rmp_level(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn)
+{
+ if (!IS_ALIGNED(pfn, PTRS_PER_PMD) || !IS_ALIGNED(gfn, PTRS_PER_PMD))
+ return PG_LEVEL_4K;
+
+ /*
+ * Check that both the desired GFN range states in the xarray, and
+ * current PFN range states in the RMP table, are conducive to
+ * creating a 2M private RMP entry.
+ */
+ if (is_gfn_range_private(kvm, gfn, gfn + PTRS_PER_PMD) &&
+ is_pfn_range_shared(pfn, pfn + PTRS_PER_PMD))
+ return PG_LEVEL_2M;
+
+ return PG_LEVEL_4K;
+}
+
+int sev_gmem_prepare(struct kvm *kvm, struct kvm_memory_slot *slot,
+ kvm_pfn_t pfn, gfn_t gfn, u8 *max_level)
+{
+ struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
+ int level, rc = 0;
+ bool assigned;
+
+ if (!sev_snp_guest(kvm))
+ return 0;
+
+ rc = snp_lookup_rmpentry(pfn, &assigned, &level);
+ if (rc)
+ return rc;
+
+ /* No conversion needed, just clamp xax_level according to RMP entry. */
+ if (assigned)
+ goto out_adjust_level;
+
+ if (*max_level == PG_LEVEL_4K)
+ level = PG_LEVEL_4K;
+ else
+ level = get_supported_rmp_level(kvm, pfn, gfn);
+
+ rc = rmp_make_private(pfn, gfn_to_gpa(gfn), level, sev->asid, false);
+ if (rc)
+ pr_err_ratelimited("%s: failed gfn %llx pfn %llx level %d rc %d\n",
+ __func__, gfn, pfn, level, rc);
+
+out_adjust_level:
+ pr_debug("%s: pfn %llx gfn %llx max_level %d level %d assigned %d\n",
+ __func__, pfn, gfn, *max_level, level, assigned);
+ if (*max_level > level)
+ *max_level = level;
+
+ return rc;
+}
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 81b9f4e04a8d..9085a122907c 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4934,6 +4934,8 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.vcpu_deliver_sipi_vector = svm_vcpu_deliver_sipi_vector,
.vcpu_get_apicv_inhibit_reasons = avic_vcpu_get_apicv_inhibit_reasons,
.alloc_apic_backing_page = svm_alloc_apic_backing_page,
+
+ .gmem_prepare = sev_gmem_prepare,
};
/*
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index e73a58e489c7..0438f52e4396 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -770,6 +770,8 @@ void sev_es_unmap_ghcb(struct vcpu_svm *svm);
struct page *snp_safe_alloc_page(struct kvm_vcpu *vcpu);
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);
/* vmenter.S */
--
2.25.1
next prev parent reply other threads:[~2023-06-12 4:53 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-12 4:25 [PATCH RFC v9 00/51] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 01/51] KVM: x86: Add gmem hook for initializing private memory Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 02/51] KVM: x86: Add gmem hook for invalidating " Michael Roth
2023-06-12 10:49 ` Borislav Petkov
2023-06-19 13:39 ` Borislav Petkov
2023-06-12 4:25 ` [PATCH RFC v9 03/51] KVM: x86: Use full 64-bit error code for kvm_mmu_do_page_fault Michael Roth
2023-06-14 14:24 ` Isaku Yamahata
2023-06-12 4:25 ` [PATCH RFC v9 04/51] KVM: x86: Determine shared/private faults using a configurable mask Michael Roth
2023-06-14 16:47 ` Isaku Yamahata
2023-06-20 20:28 ` Michael Roth
2023-06-20 21:18 ` Isaku Yamahata
2023-06-21 23:00 ` Michael Roth
2023-06-22 8:01 ` Isaku Yamahata
2023-06-22 9:55 ` Huang, Kai
2023-06-22 15:32 ` Michael Roth
2023-06-22 22:31 ` Huang, Kai
2023-06-22 23:39 ` Isaku Yamahata
2023-06-22 23:52 ` Huang, Kai
2023-06-23 14:43 ` Isaku Yamahata
2023-06-19 16:27 ` Borislav Petkov
2023-06-20 20:36 ` Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 05/51] x86/coco: move CONFIG_HAS_CC_PLATFORM check down into coco/Makefile Michael Roth
2023-06-12 7:07 ` Kirill A . Shutemov
2023-06-20 12:09 ` Borislav Petkov
2023-06-20 20:43 ` Michael Roth
2023-06-21 8:54 ` Borislav Petkov
2023-06-29 21:02 ` Michael Roth
2023-07-10 3:05 ` Sathyanarayanan Kuppuswamy
2023-07-10 13:11 ` Tom Lendacky
2023-06-12 4:25 ` [PATCH RFC v9 06/51] x86/cpufeatures: Add SEV-SNP CPU feature Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 07/51] x86/sev: Add the host SEV-SNP initialization support Michael Roth
2023-06-12 15:34 ` Dave Hansen
2023-06-21 9:15 ` Borislav Petkov
2023-06-21 14:31 ` Dave Hansen
2023-06-21 15:59 ` Borislav Petkov
2023-06-21 9:42 ` Borislav Petkov
2023-06-21 14:36 ` Tom Lendacky
2023-06-21 19:15 ` Kalra, Ashish
2023-08-09 13:03 ` Jeremi Piotrowski
2023-06-12 4:25 ` [PATCH RFC v9 08/51] x86/speculation: Do not enable Automatic IBRS if SEV SNP is enabled Michael Roth
2023-06-12 15:39 ` Dave Hansen
2023-07-18 22:34 ` Kim Phillips
2023-07-18 23:17 ` Dave Hansen
2023-07-20 19:11 ` Kim Phillips
2023-07-20 22:24 ` Dave Hansen
2023-07-21 16:56 ` Kim Phillips
2023-06-12 4:25 ` [PATCH RFC v9 09/51] x86/sev: Add RMP entry lookup helpers Michael Roth
2023-06-12 16:08 ` Dave Hansen
2023-06-30 21:57 ` Michael Roth
2023-06-30 22:29 ` Dave Hansen
2023-06-12 4:25 ` [PATCH RFC v9 10/51] x86/fault: Add helper for dumping RMP entries Michael Roth
2023-06-12 16:12 ` Dave Hansen
2023-06-12 4:25 ` [PATCH RFC v9 11/51] x86/traps: Define RMP violation #PF error code Michael Roth
2023-06-12 16:26 ` Dave Hansen
2023-06-12 4:25 ` [PATCH RFC v9 12/51] x86/fault: Report RMP page faults for kernel addresses Michael Roth
2023-06-12 16:30 ` Dave Hansen
2023-06-12 4:25 ` [PATCH RFC v9 13/51] x86/fault: Handle RMP page faults for user addresses Michael Roth
2023-06-12 16:40 ` Dave Hansen
2023-06-12 4:25 ` [PATCH RFC v9 14/51] x86/sev: Add helper functions for RMPUPDATE and PSMASH instruction Michael Roth
2023-06-12 17:00 ` Dave Hansen
2023-06-12 4:25 ` [PATCH RFC v9 15/51] x86/sev: Invalidate pages from the direct map when adding them to the RMP table Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 16/51] crypto: ccp: Define the SEV-SNP commands Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 17/51] crypto: ccp: Add support to initialize the AMD-SP for SEV-SNP Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 18/51] crypto: ccp: Provide API to issue SEV and SNP commands Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 19/51] x86/sev: Introduce snp leaked pages list Michael Roth
2023-08-09 12:46 ` Jeremi Piotrowski
2023-06-12 4:25 ` [PATCH RFC v9 20/51] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 21/51] crypto: ccp: Handle the legacy SEV command " Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 22/51] crypto: ccp: Add the SNP_PLATFORM_STATUS command Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 23/51] KVM: SEV: Select CONFIG_KVM_PROTECTED_VM when CONFIG_KVM_AMD_SEV=y Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 24/51] KVM: SVM: Add support to handle AP reset MSR protocol Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 25/51] KVM: SVM: Add GHCB handling for Hypervisor Feature Support requests Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 26/51] KVM: SVM: Make AVIC backing, VMSA and VMCB memory allocation SNP safe Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 27/51] KVM: SVM: Add initial SEV-SNP support Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 28/51] KVM: SVM: Add KVM_SNP_INIT command Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 29/51] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command Michael Roth
2023-06-12 17:08 ` Peter Gonda
2023-06-12 4:25 ` [PATCH RFC v9 30/51] KVM: Add HVA range operator Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 31/51] KVM: Split out memory attribute xarray updates to helper function Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 32/51] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_UPDATE command Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 33/51] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH command Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 34/51] KVM: SVM: Add support to handle GHCB GPA register VMGEXIT Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 35/51] KVM: SVM: Add KVM_EXIT_VMGEXIT Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 36/51] KVM: SVM: Add support to handle MSR based Page State Change VMGEXIT Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 37/51] KVM: SVM: Add support to handle " Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 38/51] KVM: x86: Export the kvm_zap_gfn_range() for the SNP use Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 39/51] KVM: x86: Define RMP page fault error bits for #NPF Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 40/51] KVM: SVM: Add support to handle RMP nested page faults Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 41/51] KVM: SVM: Use a VMSA physical address variable for populating VMCB Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 42/51] KVM: SVM: Support SEV-SNP AP Creation NAE event Michael Roth
2023-08-15 16:00 ` Peter Gonda
2023-06-12 4:25 ` [PATCH RFC v9 43/51] KVM: SEV: Configure MMU to check for private fault flags Michael Roth
2023-06-12 4:25 ` Michael Roth [this message]
2023-06-12 4:25 ` [PATCH RFC v9 45/51] KVM: SEV: Implement gmem hook for invalidating private pages Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 46/51] KVM: SVM: Add module parameter to enable the SEV-SNP Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 47/51] iommu/amd: Add IOMMU_SNP_SHUTDOWN support Michael Roth
2023-09-07 10:31 ` Suthikulpanit, Suravee
2023-06-12 4:25 ` [PATCH RFC v9 48/51] crypto: ccp: Add the SNP_{SET,GET}_EXT_CONFIG command Michael Roth
2023-06-13 6:24 ` Alexey Kardashevskiy
2023-06-12 4:25 ` [PATCH RFC v9 49/51] x86/sev: Add KVM commands for per-instance certs Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 50/51] KVM: SVM: Provide support for SNP_GUEST_REQUEST NAE event Michael Roth
2023-06-12 4:25 ` [PATCH RFC v9 51/51] crypto: ccp: Add debug support for decrypting pages Michael Roth
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