From: "Philippe Mathieu-Daudé" <philmd@oss.qualcomm.com>
To: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
David Woodhouse <dwmw2@infradead.org>,
Paul Durrant <paul@xen.org>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
syzbot+5b32c49cd8f005e65654@syzkaller.appspotmail.com,
syzbot+5d2b94b77112148d1744@syzkaller.appspotmail.com,
David Woodhouse <dwmw@amazon.co.uk>
Subject: Re: [PATCH v4 09/11] KVM: x86: Treat a vCPU as unreachable if its index is invalid
Date: Wed, 1 Jul 2026 17:07:10 +0200 [thread overview]
Message-ID: <5a848836-78fe-40b7-a34a-c64882c0575a@oss.qualcomm.com> (raw)
In-Reply-To: <20260630225619.511632-10-seanjc@google.com>
On 1/7/26 00:56, Sean Christopherson wrote:
> In the "vCPU locked or unreachable" lockdep assertion, treat a vCPU as
> unreachable if its index is invalid, i.e. if the vCPU is in the process of
> being created. Until the vCPU is inserted into the array of vCPUs, the
> only way to get at the vCPU is via kvm_vm_ioctl_create_vcpu(). Note, the
> actual index is set _before_ adding the vCPU to the array, i.e. there's no
> risk of a false negative on the lockdep assertion.
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
> include/linux/kvm_host.h | 1 +
> 1 file changed, 1 insertion(+)
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
next prev parent reply other threads:[~2026-07-01 15:07 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-30 22:56 [PATCH v4 00/11] KVM: x86/hyperv: Fix racy usage of vcpu->arch.hyperv Sean Christopherson
2026-06-30 22:56 ` [PATCH v4 01/11] KVM: x86/hyperv: Get target FIFO in hv_tlb_flush_enqueue(), not caller Sean Christopherson
2026-06-30 22:56 ` [PATCH v4 02/11] KVM: x86/hyperv: Check for NULL vCPU Hyper-V object in kvm_hv_get_tlb_flush_fifo() Sean Christopherson
2026-07-01 15:02 ` Philippe Mathieu-Daudé
2026-06-30 22:56 ` [PATCH v4 03/11] KVM: x86/hyperv: Ensure vCPU's Hyper-V object is initialized on cross-vCPU accesses Sean Christopherson
2026-06-30 22:56 ` [PATCH v4 04/11] KVM: x86/xen: Always route non-singleshot-timer vCPU hypercalls to userspace Sean Christopherson
2026-06-30 22:56 ` [PATCH v4 05/11] KVM: x86/xen: Consolidate checks on Xen vCPU ID for singleshot timer hypercalls Sean Christopherson
2026-07-01 15:03 ` Philippe Mathieu-Daudé
2026-06-30 22:56 ` [PATCH v4 06/11] KVM: x86/xen: Punt singleshot timer hcalls to userspace if Xen vCPU ID isn't set Sean Christopherson
2026-06-30 22:56 ` [PATCH v4 07/11] KVM: Initialize a vCPU's index to '-1' while it's being created Sean Christopherson
2026-07-01 15:06 ` Philippe Mathieu-Daudé
2026-06-30 22:56 ` [PATCH v4 08/11] KVM: Move nVMX's lockdep logic for vcpu->mutex to a common helper Sean Christopherson
2026-07-01 15:04 ` Philippe Mathieu-Daudé
2026-06-30 22:56 ` [PATCH v4 09/11] KVM: x86: Treat a vCPU as unreachable if its index is invalid Sean Christopherson
2026-07-01 15:07 ` Philippe Mathieu-Daudé [this message]
2026-06-30 22:56 ` [PATCH v4 10/11] KVM: x86/hyperv: Assert vCPU's mutex is held in to_hv_vcpu() Sean Christopherson
2026-06-30 22:56 ` [PATCH v4 11/11] KVM: x86/hyperv: Use {READ,WRITE}_ONCE for cross-task synic->active accesses Sean Christopherson
2026-07-14 18:41 ` [PATCH v4 00/11] KVM: x86/hyperv: Fix racy usage of vcpu->arch.hyperv Sean Christopherson
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