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From: Brijesh Singh <brijesh.singh@amd.com>
To: x86@kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, linux-coco@lists.linux.dev,
	linux-mm@kvack.org, linux-crypto@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Dov Murik <dovmurik@linux.ibm.com>,
	Tobin Feldman-Fitzthum <tobin@ibm.com>,
	Borislav Petkov <bp@alien8.de>,
	Michael Roth <michael.roth@amd.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Andi Kleen <ak@linux.intel.com>,
	tony.luck@intel.com, marcorr@google.com,
	sathyanarayanan.kuppuswamy@linux.intel.com,
	Brijesh Singh <brijesh.singh@amd.com>
Subject: [PATCH Part2 v5 06/45] x86/sev: Invalid pages from direct map when adding it to RMP table
Date: Fri, 20 Aug 2021 10:58:39 -0500	[thread overview]
Message-ID: <20210820155918.7518-7-brijesh.singh@amd.com> (raw)
In-Reply-To: <20210820155918.7518-1-brijesh.singh@amd.com>

The integrity guarantee of SEV-SNP is enforced through the RMP table.
The RMP is used with standard x86 and IOMMU page tables to enforce memory
restrictions and page access rights. The RMP check is enforced as soon as
SEV-SNP is enabled globally in the system. When hardware encounters an
RMP checks failure, it raises a page-fault exception.

The rmp_make_private() and rmp_make_shared() helpers are used to add
or remove the pages from the RMP table. Improve the rmp_make_private() to
invalid state so that pages cannot be used in the direct-map after its
added in the RMP table, and restore to its default valid permission after
the pages are removed from the RMP table.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 arch/x86/kernel/sev.c | 61 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 60 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 8627c49666c9..bad41deb8335 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -2441,10 +2441,42 @@ int psmash(u64 pfn)
 }
 EXPORT_SYMBOL_GPL(psmash);
 
+static int restore_direct_map(u64 pfn, int npages)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < npages; i++) {
+		ret = set_direct_map_default_noflush(pfn_to_page(pfn + i));
+		if (ret)
+			goto cleanup;
+	}
+
+cleanup:
+	WARN(ret > 0, "Failed to restore direct map for pfn 0x%llx\n", pfn + i);
+	return ret;
+}
+
+static int invalid_direct_map(unsigned long pfn, int npages)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < npages; i++) {
+		ret = set_direct_map_invalid_noflush(pfn_to_page(pfn + i));
+		if (ret)
+			goto cleanup;
+	}
+
+	return 0;
+
+cleanup:
+	restore_direct_map(pfn, i);
+	return ret;
+}
+
 static int rmpupdate(u64 pfn, struct rmpupdate *val)
 {
 	unsigned long paddr = pfn << PAGE_SHIFT;
-	int ret;
+	int ret, level, npages;
 
 	if (!pfn_valid(pfn))
 		return -EINVAL;
@@ -2452,11 +2484,38 @@ static int rmpupdate(u64 pfn, struct rmpupdate *val)
 	if (!cpu_feature_enabled(X86_FEATURE_SEV_SNP))
 		return -ENXIO;
 
+	level = RMP_TO_X86_PG_LEVEL(val->pagesize);
+	npages = page_level_size(level) / PAGE_SIZE;
+
+	/*
+	 * If page is getting assigned in the RMP table then unmap it from the
+	 * direct map.
+	 */
+	if (val->assigned) {
+		if (invalid_direct_map(pfn, npages)) {
+			pr_err("Failed to unmap pfn 0x%llx pages %d from direct_map\n",
+			       pfn, npages);
+			return -EFAULT;
+		}
+	}
+
 	/* Binutils version 2.36 supports the RMPUPDATE mnemonic. */
 	asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFE"
 		     : "=a"(ret)
 		     : "a"(paddr), "c"((unsigned long)val)
 		     : "memory", "cc");
+
+	/*
+	 * Restore the direct map after the page is removed from the RMP table.
+	 */
+	if (!ret && !val->assigned) {
+		if (restore_direct_map(pfn, npages)) {
+			pr_err("Failed to map pfn 0x%llx pages %d in direct_map\n",
+			       pfn, npages);
+			return -EFAULT;
+		}
+	}
+
 	return ret;
 }
 
-- 
2.17.1


  parent reply	other threads:[~2021-08-20 16:00 UTC|newest]

Thread overview: 231+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 15:58 [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 01/45] x86/cpufeatures: Add SEV-SNP CPU feature Brijesh Singh
2021-09-16 16:56   ` Borislav Petkov
2021-09-16 17:35     ` Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 02/45] iommu/amd: Introduce function to check SEV-SNP support Brijesh Singh
2021-09-16 17:26   ` Borislav Petkov
2021-08-20 15:58 ` [PATCH Part2 v5 03/45] x86/sev: Add the host SEV-SNP initialization support Brijesh Singh
2021-09-24  8:58   ` Borislav Petkov
2021-08-20 15:58 ` [PATCH Part2 v5 04/45] x86/sev: Add RMP entry lookup helpers Brijesh Singh
2021-09-24  9:49   ` Borislav Petkov
2021-09-27 16:01     ` Brijesh Singh
2021-09-27 16:04       ` Brijesh Singh
2021-09-29 12:56         ` Borislav Petkov
2022-06-02 11:57   ` Jarkko Sakkinen
2021-08-20 15:58 ` [PATCH Part2 v5 05/45] x86/sev: Add helper functions for RMPUPDATE and PSMASH instruction Brijesh Singh
2021-09-24 14:04   ` Borislav Petkov
2021-09-27 16:06     ` Brijesh Singh
2021-10-15 18:05   ` Sean Christopherson
2021-10-15 20:18     ` Brijesh Singh
2021-10-15 20:27       ` Sean Christopherson
2021-10-15 20:36         ` Brijesh Singh
2021-08-20 15:58 ` Brijesh Singh [this message]
2021-09-29 14:34   ` [PATCH Part2 v5 06/45] x86/sev: Invalid pages from direct map when adding it to RMP table Borislav Petkov
2021-09-30 16:19     ` Brijesh Singh
2021-10-01 11:06       ` Borislav Petkov
2021-08-20 15:58 ` [PATCH Part2 v5 07/45] x86/traps: Define RMP violation #PF error code Brijesh Singh
2021-09-29 17:25   ` Borislav Petkov
2021-08-20 15:58 ` [PATCH Part2 v5 08/45] x86/fault: Add support to handle the RMP fault for user address Brijesh Singh
2021-08-23 14:20   ` Dave Hansen
2021-08-23 14:36     ` Brijesh Singh
2021-08-23 14:50       ` Dave Hansen
2021-08-24 16:42         ` Joerg Roedel
2021-08-25  9:16           ` Vlastimil Babka
2021-08-25 13:50             ` Tom Lendacky
2021-09-29 18:19   ` Borislav Petkov
2021-08-20 15:58 ` [PATCH Part2 v5 09/45] x86/fault: Add support to dump RMP entry on fault Brijesh Singh
2021-09-29 18:38   ` Borislav Petkov
2021-08-20 15:58 ` [PATCH Part2 v5 10/45] crypto: ccp: shutdown SEV firmware on kexec Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 11/45] crypto:ccp: Define the SEV-SNP commands Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 12/45] crypto: ccp: Add support to initialize the AMD-SP for SEV-SNP Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 13/45] crypto:ccp: Provide APIs to issue SEV-SNP commands Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 14/45] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Brijesh Singh
2022-02-25 18:03   ` Alper Gun
2022-03-01 14:12     ` Brijesh Singh
2022-06-14  0:10   ` Alper Gun
2021-08-20 15:58 ` [PATCH Part2 v5 15/45] crypto: ccp: Handle the legacy SEV command " Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 16/45] crypto: ccp: Add the SNP_PLATFORM_STATUS command Brijesh Singh
2021-09-10  3:18   ` Marc Orr
2021-09-13 11:17     ` Brijesh Singh
2021-09-22 17:35   ` Dr. David Alan Gilbert
2021-09-23 18:01     ` Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 17/45] crypto: ccp: Add the SNP_{SET,GET}_EXT_CONFIG command Brijesh Singh
2021-09-01 21:02   ` Connor Kuehl
2021-09-01 23:06     ` Brijesh Singh
2021-09-10  3:27   ` Marc Orr
2021-09-13 11:29     ` Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 18/45] crypto: ccp: Provide APIs to query extended attestation report Brijesh Singh
2021-09-10  3:30   ` Marc Orr
2021-09-12  7:46     ` Dov Murik
2021-08-20 15:58 ` [PATCH Part2 v5 19/45] KVM: SVM: Add support to handle AP reset MSR protocol Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 20/45] KVM: SVM: Provide the Hypervisor Feature support VMGEXIT Brijesh Singh
2021-10-12 20:38   ` Sean Christopherson
2021-08-20 15:58 ` [PATCH Part2 v5 21/45] KVM: SVM: Make AVIC backing, VMSA and VMCB memory allocation SNP safe Brijesh Singh
2021-09-22 18:55   ` Dr. David Alan Gilbert
2021-09-23 18:09     ` Brijesh Singh
2021-09-23 18:39       ` Dr. David Alan Gilbert
2021-09-23 22:23         ` Brijesh Singh
2021-09-23 19:17       ` Marc Orr
2021-09-23 20:44         ` Brijesh Singh
2021-09-23 20:55           ` Marc Orr
2021-10-12 20:44   ` Sean Christopherson
2021-08-20 15:58 ` [PATCH Part2 v5 22/45] KVM: SVM: Add initial SEV-SNP support Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 23/45] KVM: SVM: Add KVM_SNP_INIT command Brijesh Singh
2021-09-05  6:56   ` Dov Murik
2021-09-05 13:59     ` Brijesh Singh
2021-09-10  3:32   ` Marc Orr
2021-09-13 11:32     ` Brijesh Singh
2021-09-16 15:50   ` Peter Gonda
2022-06-13 20:58   ` Alper Gun
2022-06-13 23:15     ` Ashish Kalra
2022-06-13 23:33       ` Alper Gun
2022-06-14  0:21         ` Ashish Kalra
2022-06-14 15:37           ` Peter Gonda
2022-06-14 16:11             ` Kalra, Ashish
2022-06-14 16:30               ` Peter Gonda
2022-06-14 17:16                 ` Kalra, Ashish
2022-06-14 18:58                   ` Alper Gun
2022-06-14 20:23                     ` Kalra, Ashish
2022-06-14 20:29                       ` Peter Gonda
2022-06-14 20:39                         ` Kalra, Ashish
2021-08-20 15:58 ` [PATCH Part2 v5 24/45] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command Brijesh Singh
2021-08-20 15:58 ` [PATCH Part2 v5 25/45] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_UPDATE command Brijesh Singh
2021-09-27 16:43   ` Peter Gonda
2021-09-27 19:33     ` Brijesh Singh
2021-10-05 15:01       ` Peter Gonda
2021-08-20 15:58 ` [PATCH Part2 v5 26/45] KVM: SVM: Mark the private vma unmerable for SEV-SNP guests Brijesh Singh
2021-09-23 17:18   ` Dr. David Alan Gilbert
2021-10-12 18:46   ` Sean Christopherson
2021-10-13 12:39     ` Brijesh Singh
2021-10-13 14:34       ` Sean Christopherson
2021-10-13 14:51         ` Brijesh Singh
2021-10-13 15:33           ` Sean Christopherson
2021-08-20 15:59 ` [PATCH Part2 v5 27/45] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH command Brijesh Singh
2022-05-18 20:21   ` Marc Orr
2022-05-18 20:35     ` Kalra, Ashish
2021-08-20 15:59 ` [PATCH Part2 v5 28/45] KVM: X86: Keep the NPT and RMP page level in sync Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 29/45] KVM: x86/mmu: Move 'pfn' variable to caller of direct_page_fault() Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 30/45] KVM: x86/mmu: Introduce kvm_mmu_map_tdp_page() for use by TDX and SNP Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 31/45] KVM: x86: Introduce kvm_mmu_get_tdp_walk() for SEV-SNP use Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 32/45] KVM: x86: Define RMP page fault error bits for #NPF Brijesh Singh
2021-09-30 23:41   ` Marc Orr
2021-10-01 13:03     ` Borislav Petkov
2021-08-20 15:59 ` [PATCH Part2 v5 33/45] KVM: x86: Update page-fault trace to log full 64-bit error code Brijesh Singh
2021-10-13 21:23   ` Sean Christopherson
2021-08-20 15:59 ` [PATCH Part2 v5 34/45] KVM: SVM: Do not use long-lived GHCB map while setting scratch area Brijesh Singh
2021-10-13 21:20   ` Sean Christopherson
2021-10-15 16:11     ` Brijesh Singh
2021-10-15 16:44       ` Sean Christopherson
2021-08-20 15:59 ` [PATCH Part2 v5 35/45] KVM: SVM: Remove the long-lived GHCB host map Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 36/45] KVM: SVM: Add support to handle GHCB GPA register VMGEXIT Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 37/45] KVM: SVM: Add support to handle MSR based Page State Change VMGEXIT Brijesh Singh
2021-09-28  9:56   ` Dr. David Alan Gilbert
2021-10-12 21:48   ` Sean Christopherson
2021-10-13 17:04     ` Sean Christopherson
2021-10-13 17:05     ` Brijesh Singh
2021-10-13 17:24       ` Sean Christopherson
2021-10-13 17:49         ` Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 38/45] KVM: SVM: Add support to handle " Brijesh Singh
2021-09-28 10:17   ` Dr. David Alan Gilbert
2021-09-28 23:20     ` Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 39/45] KVM: SVM: Introduce ops for the post gfn map and unmap Brijesh Singh
2021-10-13  0:23   ` Sean Christopherson
2021-10-13 18:10     ` Brijesh Singh
2021-10-13 20:10       ` Sean Christopherson
2021-10-13 21:49         ` Brijesh Singh
2021-10-13 22:10           ` Sean Christopherson
2021-10-13 22:31             ` Brijesh Singh
2021-10-13 20:16     ` Sean Christopherson
2021-10-15 16:31       ` Brijesh Singh
2021-10-15 17:16         ` Sean Christopherson
2021-08-20 15:59 ` [PATCH Part2 v5 40/45] KVM: x86: Export the kvm_zap_gfn_range() for the SNP use Brijesh Singh
2021-08-20 15:59 ` [PATCH Part2 v5 41/45] KVM: SVM: Add support to handle the RMP nested page fault Brijesh Singh
2021-09-29 12:24   ` Dr. David Alan Gilbert
2021-10-13 17:57   ` Sean Christopherson
2021-08-20 15:59 ` [PATCH Part2 v5 42/45] KVM: SVM: Provide support for SNP_GUEST_REQUEST NAE event Brijesh Singh
2021-09-29 21:33   ` Peter Gonda
2021-09-29 22:00   ` Peter Gonda
2021-08-20 15:59 ` [PATCH Part2 v5 43/45] KVM: SVM: Use a VMSA physical address variable for populating VMCB Brijesh Singh
2021-10-15 18:58   ` Sean Christopherson
2021-08-20 15:59 ` [PATCH Part2 v5 44/45] KVM: SVM: Support SEV-SNP AP Creation NAE event Brijesh Singh
2021-10-15 19:50   ` Sean Christopherson
2021-10-20 21:48     ` Brijesh Singh
2021-10-20 23:01       ` Sean Christopherson
2021-08-20 15:59 ` [PATCH Part2 v5 45/45] KVM: SVM: Add module parameter to enable the SEV-SNP Brijesh Singh
2021-11-12 15:43 ` [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Peter Gonda
2021-11-12 17:59   ` Dave Hansen
2021-11-12 18:35     ` Borislav Petkov
2021-11-12 19:48       ` Sean Christopherson
2021-11-12 20:04         ` Borislav Petkov
2021-11-12 20:37           ` Sean Christopherson
2021-11-12 20:53             ` Borislav Petkov
2021-11-12 21:12               ` Peter Gonda
2021-11-12 21:20                 ` Andy Lutomirski
2021-11-12 22:04                   ` Borislav Petkov
2021-11-12 22:52                   ` Peter Gonda
2021-11-13  0:00                 ` Sean Christopherson
2021-11-13  0:10                   ` Marc Orr
2021-11-13 18:34                     ` Sean Christopherson
2021-11-14  7:54                       ` Marc Orr
2021-11-15 17:16                         ` Sean Christopherson
2021-11-15 16:36                       ` Joerg Roedel
2021-11-15 17:25                         ` Sean Christopherson
2021-11-12 21:30             ` Marc Orr
2021-11-12 21:37               ` Dave Hansen
2021-11-12 21:40                 ` Marc Orr
2021-11-12 21:39               ` Andy Lutomirski
2021-11-12 21:43                 ` Marc Orr
2021-11-12 22:54                   ` Peter Gonda
2021-11-13  0:53                     ` Sean Christopherson
2021-11-13  1:04                       ` Marc Orr
2021-11-13 18:28                         ` Sean Christopherson
2021-11-14  7:41                           ` Marc Orr
2021-11-15 18:17                             ` Sean Christopherson
2021-11-15 16:52                           ` Joerg Roedel
2021-11-15 16:18             ` Brijesh Singh
2021-11-15 18:44               ` Sean Christopherson
2021-11-15 18:58                 ` Brijesh Singh
2021-11-12 21:16         ` Marc Orr
2021-11-12 21:23           ` Andy Lutomirski
2021-11-12 21:35             ` Borislav Petkov
2021-11-15 12:30         ` Dr. David Alan Gilbert
2021-11-15 14:42           ` Joerg Roedel
2021-11-15 15:33             ` Dr. David Alan Gilbert
2021-11-15 16:20               ` Joerg Roedel
2021-11-15 16:32                 ` Dr. David Alan Gilbert
2021-11-15 18:26           ` Sean Christopherson
2021-11-15 18:41             ` Marc Orr
2021-11-15 19:15               ` Sean Christopherson
2021-11-16  3:07                 ` Marc Orr
2021-11-16  5:14                   ` Andy Lutomirski
2021-11-16 13:21                     ` Joerg Roedel
2021-11-16 18:26                       ` Sean Christopherson
2021-11-16 18:39                         ` Peter Gonda
2021-11-16 13:30                 ` Joerg Roedel
2021-11-16  5:00               ` Andy Lutomirski
2021-11-16 13:02             ` Joerg Roedel
2021-11-16 20:08               ` Sean Christopherson
2021-11-15 16:16         ` Joerg Roedel
2021-11-22 15:23   ` Brijesh Singh
2021-11-22 17:03     ` Vlastimil Babka
2021-11-22 18:01       ` Brijesh Singh
2021-11-22 18:30     ` Dave Hansen
2021-11-22 19:06       ` Brijesh Singh
2021-11-22 19:14         ` Dave Hansen
2021-11-22 20:33           ` Brijesh Singh
2021-11-22 21:34             ` Sean Christopherson
2021-11-22 22:51             ` Dave Hansen
2021-11-23  5:15               ` Luck, Tony
2021-11-23  7:18               ` Borislav Petkov
2021-11-23 15:36                 ` Sean Christopherson
2021-11-23 16:26                   ` Borislav Petkov
2021-11-23  8:55               ` Vlastimil Babka
2021-11-24 16:03               ` Joerg Roedel
2021-11-24 17:48                 ` Dave Hansen
2021-11-24 19:34                   ` Vlastimil Babka
2021-11-25 10:05                   ` Joerg Roedel
2021-11-29 14:44                     ` Brijesh Singh
2021-11-29 14:58                       ` Vlastimil Babka
2021-11-29 16:13                         ` Brijesh Singh
2021-11-30 19:40                           ` Vlastimil Babka
2021-11-29 16:41                     ` Dave Hansen

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