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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part2 RFC v4 25/40] KVM: SVM: Reclaim the guest pages when SEV-SNP VM terminates Date: Wed, 7 Jul 2021 13:36:01 -0500 Message-Id: <20210707183616.5620-26-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707183616.5620-1-brijesh.singh@amd.com> References: <20210707183616.5620-1-brijesh.singh@amd.com> X-ClientProxiedBy: SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2eeb9e32-e9b6-4e8c-7a48-08d941765855 X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB2711.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2021 18:37:59.5478 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: AA7LasvH4IJ0unvnb5GvYdea2Gfzmu3gkRYLxnn9vjAnw0Ig8rfaS4e80Uvg//A0Jkipy0tNzcmvcNsoIN1hyA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4082 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org The guest pages of the SEV-SNP VM maybe added as a private page in the RMP entry (assigned bit is set). The guest private pages must be transitioned to the hypervisor state before its freed. Signed-off-by: Brijesh Singh --- arch/x86/kvm/svm/sev.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 1f0635ac9ff9..4468995dd209 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -1940,6 +1940,45 @@ find_enc_region(struct kvm *kvm, struct kvm_enc_region *range) static void __unregister_enc_region_locked(struct kvm *kvm, struct enc_region *region) { + struct rmpupdate val = {}; + unsigned long i, pfn; + struct rmpentry *e; + int level, rc; + + /* + * The guest memory pages are assigned in the RMP table. Unassign it + * before releasing the memory. + */ + if (sev_snp_guest(kvm)) { + for (i = 0; i < region->npages; i++) { + pfn = page_to_pfn(region->pages[i]); + + if (need_resched()) + schedule(); + + e = snp_lookup_page_in_rmptable(region->pages[i], &level); + if (unlikely(!e)) + continue; + + /* If its not a guest assigned page then skip it. */ + if (!rmpentry_assigned(e)) + continue; + + /* Is the page part of a 2MB RMP entry? */ + if (level == PG_LEVEL_2M) { + val.pagesize = RMP_PG_SIZE_2M; + pfn &= ~(KVM_PAGES_PER_HPAGE(PG_LEVEL_2M) - 1); + } else { + val.pagesize = RMP_PG_SIZE_4K; + } + + /* Transition the page to hypervisor owned. */ + rc = rmpupdate(pfn_to_page(pfn), &val); + if (rc) + pr_err("Failed to release pfn 0x%lx ret=%d\n", pfn, rc); + } + } + sev_unpin_memory(kvm, region->pages, region->npages); list_del(®ion->list); kfree(region);