diff options
| -rw-r--r-- | pkg/sentry/platform/kvm/machine_amd64.go | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/pkg/sentry/platform/kvm/machine_amd64.go b/pkg/sentry/platform/kvm/machine_amd64.go index dfa691e88..fe4d31702 100644 --- a/pkg/sentry/platform/kvm/machine_amd64.go +++ b/pkg/sentry/platform/kvm/machine_amd64.go @@ -111,8 +111,11 @@ func (c *vCPU) SwitchToUser(regs *syscall.PtraceRegs, fpState *byte, pt *pagetab vector = c.CPU.SwitchToUser(regs, fpState, pt, flags) exitsyscall() - // Free and clear. switch vector { + case ring0.Syscall, ring0.SyscallInt80: + // Fast path: system call executed. + return nil, usermem.NoAccess, nil + case ring0.Debug, ring0.Breakpoint: info := &arch.SignalInfo{Signo: int32(syscall.SIGTRAP)} return info, usermem.AccessType{}, platform.ErrContextSignal @@ -158,10 +161,6 @@ func (c *vCPU) SwitchToUser(regs *syscall.PtraceRegs, fpState *byte, pt *pagetab redpill() // Bail and reacqire. return nil, usermem.NoAccess, platform.ErrContextInterrupt - case ring0.Syscall, ring0.SyscallInt80: - // System call executed. - return nil, usermem.NoAccess, nil - default: panic(fmt.Sprintf("unexpected vector: 0x%x", vector)) } |