diff options
| author | Adin Scannell <ascannell@google.com> | 2018-05-14 21:13:28 -0700 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2018-05-14 21:14:17 -0700 |
| commit | 2ab754cff7b2d45e1d59798562e47317aa480ecf (patch) | |
| tree | 48f2e18f7a1195c617558a8ed8e99adb7041be37 /pkg | |
| parent | 825e9ea8098d91e9770d27124717c08d1f5d2952 (diff) | |
Make KVM system call first check.
PiperOrigin-RevId: 196613447
Change-Id: Ib76902896798f072c3031b0c5cf7b433718928b7
Diffstat (limited to 'pkg')
| -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)) } |