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Mon, 12 Dec 2022 19:30:36 -0800 (PST) Received: by mail-pf1-x449.google.com with SMTP id f14-20020a056a0022ce00b005782e3b4704so1207983pfj.4 for ; Mon, 12 Dec 2022 19:30:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=RxUces6vMG4+c5LveealZEzgVFW4k2gLn9w4VIDwQ6E=; b=lq/GEj1d2zHrbru8iZ1qjB/Gm763m2IT0FGRntOmlZZGmAogcCDxjdxsgG8QUkA4gs 3HmAKxedcc0SmnlM8mMF3b1XEjAJJvxaOoMkV2Rf73uEsd7wrce4ToRMMVotLxikcdaR 8tz060UpDPZVxXEif4gg8Fr8oHHUzwhTIh9wNHGH3mv4KqwmTj6hVqMGxUosvHTwK5OQ p+Sy6U3lcLspFg0JRm7jXJbswBNorqyfcqMfRL/jBamIWn6JrUCyOw0houliRDImP+Cy foC16AHRKQ5j66k+3J656QAirqxqhzt1d+Gvjvuhg9DgO6b0TlhOiBsNE+MMy5oNTg7j LF9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=RxUces6vMG4+c5LveealZEzgVFW4k2gLn9w4VIDwQ6E=; b=71e07Q0ctGtVtO79CXtuIsxXPR/3iOAo8qDFVR1WG0i9bjK9IpemalnCD4Z90Oouwn brH0KDVL4tmNUZ1wUADF8YIXfIlzRL2eXhJq1S5FyY7BJlh4o/GTIt1fOziQ9yDeTh4f w4d95hz1k1w/gNNsNmuzDSx4dp+YbCczzEMHMBNhn4SmPLcMJrSQN4egrkA1v/AvKSTC koLGoBSxVrcph4nUhhAfhSEW2TxZEGdtAay0WnBBEx4ddUTbgcIIAJivHzQrnrqjDd0v lC/IYROvkLDdNXkVKNXxB5RCyEz7/yZWmE4LvgJkSC8mxuTmDc+ta5NxdnVDQUm8nOPe 7lfw== X-Gm-Message-State: ANoB5pma5pOKY7p19DiEvep6XQu+8dnvuFPeO7t4z3q2gTMWEctWgp5h ecEqKXC3attOTGrlJhI/YUx+UEibymE= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:90a:2ecb:b0:219:5b3b:2b9f with SMTP id h11-20020a17090a2ecb00b002195b3b2b9fmr14549pjs.2.1670902235305; Mon, 12 Dec 2022 19:30:35 -0800 (PST) Reply-To: Sean Christopherson Date: Tue, 13 Dec 2022 03:30:26 +0000 In-Reply-To: <20221213033030.83345-1-seanjc@google.com> Mime-Version: 1.0 References: <20221213033030.83345-1-seanjc@google.com> X-Mailer: git-send-email 2.39.0.rc1.256.g54fd8350bd-goog Message-ID: <20221213033030.83345-2-seanjc@google.com> Subject: [PATCH 1/5] KVM: x86/mmu: Don't attempt to map leaf if target TDP MMU SPTE is frozen From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Robert Hoo , Greg Thelen , David Matlack , Ben Gardon , Mingwei Zhang X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1752068183202583717?= X-GMAIL-MSGID: =?utf-8?q?1752068183202583717?= Hoist the is_removed_spte() check above the "level == goal_level" check when walking SPTEs during a TDP MMU page fault to avoid attempting to map a leaf entry if said entry is frozen by a different task/vCPU. ------------[ cut here ]------------ WARNING: CPU: 3 PID: 939 at arch/x86/kvm/mmu/tdp_mmu.c:653 kvm_tdp_mmu_map+0x269/0x4b0 Modules linked in: kvm_intel CPU: 3 PID: 939 Comm: nx_huge_pages_t Not tainted 6.1.0-rc4+ #67 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:kvm_tdp_mmu_map+0x269/0x4b0 RSP: 0018:ffffc9000068fba8 EFLAGS: 00010246 RAX: 00000000000005a0 RBX: ffffc9000068fcc0 RCX: 0000000000000005 RDX: ffff88810741f000 RSI: ffff888107f04600 RDI: ffffc900006a3000 RBP: 060000010b000bf3 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 000ffffffffff000 R12: 0000000000000005 R13: ffff888113670000 R14: ffff888107464958 R15: 0000000000000000 FS: 00007f01c942c740(0000) GS:ffff888277cc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000117013006 CR4: 0000000000172ea0 Call Trace: kvm_tdp_page_fault+0x10c/0x130 kvm_mmu_page_fault+0x103/0x680 vmx_handle_exit+0x132/0x5a0 [kvm_intel] vcpu_enter_guest+0x60c/0x16f0 kvm_arch_vcpu_ioctl_run+0x1e2/0x9d0 kvm_vcpu_ioctl+0x271/0x660 __x64_sys_ioctl+0x80/0xb0 do_syscall_64+0x2b/0x50 entry_SYSCALL_64_after_hwframe+0x46/0xb0 ---[ end trace 0000000000000000 ]--- Fixes: 63d28a25e04c ("KVM: x86/mmu: simplify kvm_tdp_mmu_map flow when guest has to retry") Cc: Robert Hoo Signed-off-by: Sean Christopherson Reviewed-by: Robert Hoo --- arch/x86/kvm/mmu/tdp_mmu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 764f7c87286f..b740f38fedcc 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -1162,9 +1162,6 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) if (fault->nx_huge_page_workaround_enabled) disallowed_hugepage_adjust(fault, iter.old_spte, iter.level); - if (iter.level == fault->goal_level) - break; - /* * If SPTE has been frozen by another thread, just give up and * retry, avoiding unnecessary page table allocation and free. @@ -1172,6 +1169,9 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) if (is_removed_spte(iter.old_spte)) goto retry; + if (iter.level == fault->goal_level) + break; + /* Step down into the lower level page table if it exists. */ if (is_shadow_present_pte(iter.old_spte) && !is_large_pte(iter.old_spte))