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| author | Bin Lu <bin.lu@arm.com> | 2020-09-30 10:16:02 +0800 |
|---|---|---|
| committer | Bin Lu <bin.lu@arm.com> | 2020-10-11 23:32:54 -0400 |
| commit | 1557153cadb260706bc9721e50dc0797a2a8c48b (patch) | |
| tree | 3008f125a28f2d9d9e200c9aa5f4309d609c1c5c /pkg/sentry/platform/kvm | |
| parent | db36d948fa63ce950d94a5e8e9ebc37956543661 (diff) | |
arm64 kvm: add tls-usr support
The tls of guest-el1-sentry and host-el0-sentry may be different on Arm64.
I added a solution for it.
Signed-off-by: Bin Lu <bin.lu@arm.com>
Diffstat (limited to 'pkg/sentry/platform/kvm')
| -rw-r--r-- | pkg/sentry/platform/kvm/bluepill_arm64.go | 13 | ||||
| -rw-r--r-- | pkg/sentry/platform/kvm/bluepill_arm64.s | 12 |
2 files changed, 25 insertions, 0 deletions
diff --git a/pkg/sentry/platform/kvm/bluepill_arm64.go b/pkg/sentry/platform/kvm/bluepill_arm64.go index ed5ae03d3..58f3d6fdd 100644 --- a/pkg/sentry/platform/kvm/bluepill_arm64.go +++ b/pkg/sentry/platform/kvm/bluepill_arm64.go @@ -39,6 +39,16 @@ var ( } ) +// getTLS returns the value of TPIDR_EL0 register. +// +//go:nosplit +func getTLS() (value uint64) + +// setTLS writes the TPIDR_EL0 value. +// +//go:nosplit +func setTLS(value uint64) + // bluepillArchEnter is called during bluepillEnter. // //go:nosplit @@ -51,6 +61,8 @@ func bluepillArchEnter(context *arch.SignalContext64) (c *vCPU) { regs.Pstate = context.Pstate regs.Pstate &^= uint64(ring0.PsrFlagsClear) regs.Pstate |= ring0.KernelFlagsSet + regs.TPIDR_EL0 = getTLS() + return } @@ -65,6 +77,7 @@ func bluepillArchExit(c *vCPU, context *arch.SignalContext64) { context.Pstate = regs.Pstate context.Pstate &^= uint64(ring0.PsrFlagsClear) context.Pstate |= ring0.UserFlagsSet + setTLS(regs.TPIDR_EL0) lazyVfp := c.GetLazyVFP() if lazyVfp != 0 { diff --git a/pkg/sentry/platform/kvm/bluepill_arm64.s b/pkg/sentry/platform/kvm/bluepill_arm64.s index 04efa0147..09c7e88e5 100644 --- a/pkg/sentry/platform/kvm/bluepill_arm64.s +++ b/pkg/sentry/platform/kvm/bluepill_arm64.s @@ -32,6 +32,18 @@ #define CONTEXT_PC 0x1B8 #define CONTEXT_R0 0xB8 +// getTLS returns the value of TPIDR_EL0 register. +TEXT ·getTLS(SB),NOSPLIT,$0-8 + MRS TPIDR_EL0, R1 + MOVD R1, ret+0(FP) + RET + +// setTLS writes the TPIDR_EL0 value. +TEXT ·setTLS(SB),NOSPLIT,$0-8 + MOVD addr+0(FP), R1 + MSR R1, TPIDR_EL0 + RET + // See bluepill.go. TEXT ·bluepill(SB),NOSPLIT,$0 begin: |