1. 13 May, 2020 39 commits
  2. 08 May, 2020 1 commit
    • Suravee Suthikulpanit's avatar
      KVM: SVM: Disable AVIC before setting V_IRQ · 7d611233
      Suravee Suthikulpanit authored
      The commit 64b5bd27 ("KVM: nSVM: ignore L1 interrupt window
      while running L2 with V_INTR_MASKING=1") introduced a WARN_ON,
      which checks if AVIC is enabled when trying to set V_IRQ
      in the VMCB for enabling irq window.
      
      The following warning is triggered because the requesting vcpu
      (to deactivate AVIC) does not get to process APICv update request
      for itself until the next #vmexit.
      
      WARNING: CPU: 0 PID: 118232 at arch/x86/kvm/svm/svm.c:1372 enable_irq_window+0x6a/0xa0 [kvm_amd]
       RIP: 0010:enable_irq_window+0x6a/0xa0 [kvm_amd]
       Call Trace:
        kvm_arch_vcpu_ioctl_run+0x6e3/0x1b50 [kvm]
        ? kvm_vm_ioctl_irq_line+0x27/0x40 [kvm]
        ? _copy_to_user+0x26/0x30
        ? kvm_vm_ioctl+0xb3e/0xd90 [kvm]
        ? set_next_entity+0x78/0xc0
        kvm_vcpu_ioctl+0x236/0x610 [kvm]
        ksys_ioctl+0x8a/0xc0
        __x64_sys_ioctl+0x1a/0x20
        do_syscall_64+0x58/0x210
        entry_SYSCALL_64_after_hwframe+0x44/0xa9
      
      Fixes by sending APICV update request to all other vcpus, and
      immediately update APIC for itself.
      Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
      Link: https://lkml.org/lkml/2020/5/2/167
      Fixes: 64b5bd27 ("KVM: nSVM: ignore L1 interrupt window while running L2 with V_INTR_MASKING=1")
      Message-Id: <1588818939-54264-1-git-send-email-suravee.suthikulpanit@amd.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      7d611233