1. 17 2月, 2020 1 次提交
  2. 13 2月, 2020 3 次提交
  3. 12 2月, 2020 2 次提交
    • O
      KVM: x86: Deliver exception payload on KVM_GET_VCPU_EVENTS · a06230b6
      Oliver Upton 提交于
      KVM allows the deferral of exception payloads when a vCPU is in guest
      mode to allow the L1 hypervisor to intercept certain events (#PF, #DB)
      before register state has been modified. However, this behavior is
      incompatible with the KVM_{GET,SET}_VCPU_EVENTS ABI, as userspace
      expects register state to have been immediately modified. Userspace may
      opt-in for the payload deferral behavior with the
      KVM_CAP_EXCEPTION_PAYLOAD per-VM capability. As such,
      kvm_multiple_exception() will immediately manipulate guest registers if
      the capability hasn't been requested.
      
      Since the deferral is only necessary if a userspace ioctl were to be
      serviced at the same as a payload bearing exception is recognized, this
      behavior can be relaxed. Instead, opportunistically defer the payload
      from kvm_multiple_exception() and deliver the payload before completing
      a KVM_GET_VCPU_EVENTS ioctl.
      Signed-off-by: NOliver Upton <oupton@google.com>
      Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      a06230b6
    • O
      KVM: x86: Mask off reserved bit from #DB exception payload · 307f1cfa
      Oliver Upton 提交于
      KVM defines the #DB payload as compatible with the 'pending debug
      exceptions' field under VMX, not DR6. Mask off bit 12 when applying the
      payload to DR6, as it is reserved on DR6 but not the 'pending debug
      exceptions' field.
      
      Fixes: f10c729f ("kvm: vmx: Defer setting of DR6 until #DB delivery")
      Signed-off-by: NOliver Upton <oupton@google.com>
      Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      307f1cfa
  4. 05 2月, 2020 9 次提交
  5. 31 1月, 2020 4 次提交
  6. 28 1月, 2020 14 次提交
  7. 24 1月, 2020 7 次提交