diff options
| author | gVisor bot <gvisor-bot@google.com> | 2021-07-20 19:16:17 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-07-20 19:16:17 -0700 |
| commit | 49d9ef49873dccf2adc414f0c2ea2c41a11b6941 (patch) | |
| tree | 8b17942d0a818a43a3ecc0ce0d03d283ac689b8d | |
| parent | 1ad382220048339cb1aeecef7d69b9ddffd9168c (diff) | |
| parent | 49ada65f4c37a4384ce4f9dc0cf98317207d4472 (diff) | |
Merge pull request #6220 from laijs:disconnect-fp
PiperOrigin-RevId: 385919423
| -rw-r--r-- | pkg/sentry/platform/kvm/bluepill_amd64.s | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/pkg/sentry/platform/kvm/bluepill_amd64.s b/pkg/sentry/platform/kvm/bluepill_amd64.s index 953024600..c2a1dca11 100644 --- a/pkg/sentry/platform/kvm/bluepill_amd64.s +++ b/pkg/sentry/platform/kvm/bluepill_amd64.s @@ -37,7 +37,15 @@ TEXT ·bluepill(SB),NOSPLIT,$0 begin: MOVQ vcpu+0(FP), AX LEAQ VCPU_CPU(AX), BX + + // The gorountine stack will be changed in guest which renders + // the frame pointer outdated and misleads perf tools. + // Disconnect the frame-chain with the zeroed frame pointer + // when it is saved in the frame in bluepillHandler(). + MOVQ BP, CX + MOVQ $0, BP BYTE CLI; + MOVQ CX, BP check_vcpu: MOVQ ENTRY_CPU_SELF(GS), CX CMPQ BX, CX |