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6231c9e1a9
linux/arch/x86
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Prasad Pandit 6231c9e1a9 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: bdedff2631 ("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>
2024-01-31 07:35:07 -08:00
..
boot x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
coco - Add support managing TDX host hardware 2024-01-18 13:41:48 -08:00
configs hardening updates for v6.7-rc1 2023-10-30 19:09:55 -10:00
crypto This update includes the following changes: 2024-01-10 12:23:43 -08:00
entry asm-generic cleanups for 6.8 2024-01-10 18:13:44 -08:00
events Performance events changes for v6.8 are: 2024-01-08 19:37:20 -08:00
hyperv x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
ia32
include x86/entry/ia32: Ensure s32 is sign extended to s64 2024-01-24 11:49:19 +01:00
kernel x86/CPU/AMD: Add more models to X86_FEATURE_ZEN5 2024-01-25 12:26:21 +01:00
kvm KVM: x86: make KVM_REQ_NMI request iff NMI pending for vcpu 2024-01-31 07:35:07 -08:00
lib header cleanups for 6.8 2024-01-10 16:43:55 -08:00
math-emu
mm Many singleton patches against the MM code. The patch series which 2024-01-09 11:18:47 -08:00
net Networking changes for 6.8. 2024-01-11 10:07:29 -08:00
pci pci-v6.8-changes 2024-01-17 16:23:17 -08:00
platform x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
power
purgatory x86/purgatory: Remove LTO flags 2023-09-17 09:49:03 +02:00
ras
realmode x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
tools x86/build changes for v6.8: 2024-01-08 17:22:02 -08:00
um This pull request contains the following changes for UML: 2024-01-17 10:44:34 -08:00
video fbdev: Replace fb_pgprotect() with pgprot_framebuffer() 2023-10-12 09:20:46 +02:00
virt x86/mce: Differentiate real hardware #MCs from TDX erratum ones 2023-12-12 08:46:46 -08:00
xen x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
.gitignore
Kbuild
Kconfig IOMMU Updates for Linux v6.8 2024-01-18 15:16:57 -08:00
Kconfig.assembler x86/shstk: Add Kconfig option for shadow stack 2023-07-11 14:12:18 -07:00
Kconfig.cpu x86/Kconfig: Rework CONFIG_X86_PAE dependency 2023-12-19 13:03:06 +01:00
Kconfig.debug
Makefile Kbuild updates for v6.7 2023-11-04 08:07:19 -10:00
Makefile_32.cpu
Makefile.postlink kbuild: remove ARCH_POSTLINK from module builds 2023-10-28 21:10:08 +09:00
Makefile.um