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Tue, 05 Aug 2025 12:56:17 -0700 (PDT) Date: Tue, 05 Aug 2025 12:56:17 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <689261e1.050a0220.7f033.0030.GAE@google.com> Subject: [moderation/CI] Re: KVM: x86: Fastpath cleanups and PMU prep work From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] KVM: x86: Fastpath cleanups and PMU prep work https://lore.kernel.org/all/20250805190526.1453366-1-seanjc@google.com * [PATCH 01/18] KVM: SVM: Skip fastpath emulation on VM-Exit if next RIP isn't valid * [PATCH 02/18] KVM: x86: Add kvm_icr_to_lapic_irq() helper to allow for fastpath IPIs * [PATCH 03/18] KVM: x86: Only allow "fast" IPIs in fastpath WRMSR(X2APIC_ICR) handler * [PATCH 04/18] KVM: x86: Drop semi-arbitrary restrictions on IPI type in fastpath * [PATCH 05/18] KVM: x86: Unconditionally handle MSR_IA32_TSC_DEADLINE in fastpath exits * [PATCH 06/18] KVM: x86: Acquire SRCU in WRMSR fastpath iff instruction needs to be skipped * [PATCH 07/18] KVM: x86: Unconditionally grab data from EDX:EAX in WRMSR fastpath * [PATCH 08/18] KVM: x86: Fold WRMSR fastpath helpers into the main handler * [PATCH 09/18] KVM: x86/pmu: Move kvm_init_pmu_capability() to pmu.c * [PATCH 10/18] KVM: x86/pmu: Add wrappers for counting emulated instructions/branches * [PATCH 11/18] KVM: x86/pmu: Calculate set of to-be-emulated PMCs at time of WRMSRs * [PATCH 12/18] KVM: x86/pmu: Rename pmc_speculative_in_use() to pmc_is_locally_enabled() * [PATCH 13/18] KVM: x86/pmu: Open code pmc_event_is_allowed() in its callers * [PATCH 14/18] KVM: x86/pmu: Drop redundant check on PMC being globally enabled for emulation * [PATCH 15/18] KVM: x86/pmu: Drop redundant check on PMC being locally enabled for emulation * [PATCH 16/18] KVM: x86/pmu: Rename check_pmu_event_filter() to pmc_is_event_allowed() * [PATCH 17/18] KVM: x86: Push acquisition of SRCU in fastpath into kvm_pmu_trigger_event() * [PATCH 18/18] KVM: x86: Add a fastpath handler for INVD and found the following issue: SYZFATAL: image testing failed w/o kernel bug Full report is available here: https://ci.syzbot.org/series/dcb800fc-bfef-4784-bed8-2bc7e47a8ca0 *** SYZFATAL: image testing failed w/o kernel bug tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 260f6f4fda93c8485c8037865c941b42b9cba5d2 arch: amd64 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 config: https://ci.syzbot.org/builds/219bab5b-2202-4205-b5a6-de3ed39ac197/config *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. The email will later be sent to: [dapeng1.mi@linux.intel.com kvm@vger.kernel.org linux-kernel@vger.kernel.org pbonzini@redhat.com sandipan.das@amd.com seanjc@google.com xin@zytor.com] If the report looks fine to you, reply with: #syz upstream