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| author |  Prasad Pandit <pjp@fedoraproject.org>
| 2024-01-03 13:23:43 +0530 |
|---|---|---|
| committer |  Sean Christopherson <seanjc@google.com>
| 2024-01-31 07:35:07 -0800 |
| commit | 6231c9e1a9f35b535c66709aa8a6eda40dbc4132 (patch) | |
| tree | 861d45dcf4ab2792e7f67f00aa0513238d2ad856 /arch/x86/kvm/vmx | |
| parent | Linux 6.8-rc2 (diff) | |
| download | linux-6231c9e1a9f35b535c66709aa8a6eda40dbc4132.tar.gz linux-6231c9e1a9f35b535c66709aa8a6eda40dbc4132.tar.bz2 linux-6231c9e1a9f35b535c66709aa8a6eda40dbc4132.zip | |
KVM: x86: make KVM_REQ_NMI request iff NMI pending for vcpu
kvm_vcpu_ioctl_x86_set_vcpu_events() routine makes 'KVM_REQ_NMI'
request for a vcpu even when its 'events->nmi.pending' is zero.
Ex:
qemu_thread_start
kvm_vcpu_thread_fn
qemu_wait_io_event
qemu_wait_io_event_common
process_queued_cpu_work
do_kvm_cpu_synchronize_post_init/_reset
kvm_arch_put_registers
kvm_put_vcpu_events (cpu, level=[2|3])
This leads vCPU threads in QEMU to constantly acquire & release the
global mutex lock, delaying the guest boot due to lock contention.
Add check to make KVM_REQ_NMI request only if vcpu has NMI pending.
Fixes: bdedff263132 ("KVM: x86: Route pending NMIs from userspace through process_nmi()")
Cc: stable@vger.kernel.org
Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>
Link: https://lore.kernel.org/r/20240103075343.549293-1-ppandit@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/vmx')
0 files changed, 0 insertions, 0 deletions