diff options
| author | Marc Zyngier | 2017-04-03 19:37:52 +0100 |
|---|---|---|
| committer | Christoffer Dall | 2017-04-09 07:49:27 -0700 |
| commit | 7d1bf4e05717d900e69b249b4f08f6b36b00fbf0 (patch) | |
| tree | eb51f41c4aeed1dc30a9f2763f5620c4c198b419 | |
| parent | 4c70cf07cecab1dd5446249dc8d4795bec693c78 (diff) | |
ARM: hyp-stub: Implement HVC_RESET_VECTORS stub hypercall
Let's define a new stub hypercall that resets the HYP configuration
to its default: hyp-stub vectors, and MMU disabled.
Of course, for the hyp-stub itself, this is a trivial no-op.
Hypervisors will have a bit more work to do.
Tested-by: Keerthy <j-keerthy@ti.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
| -rw-r--r-- | arch/arm/include/asm/virt.h | 3 | ||||
| -rw-r--r-- | arch/arm/kernel/hyp-stub.S | 11 |
2 files changed, 13 insertions, 1 deletions
diff --git a/arch/arm/include/asm/virt.h b/arch/arm/include/asm/virt.h index c16f70d6953f..c5a27570b225 100644 --- a/arch/arm/include/asm/virt.h +++ b/arch/arm/include/asm/virt.h @@ -101,6 +101,9 @@ extern char __hyp_text_end[]; #define HVC_GET_VECTORS 0 #define HVC_SET_VECTORS 1 #define HVC_SOFT_RESTART 2 +#define HVC_RESET_VECTORS 3 + +#define HVC_STUB_HCALL_NR 4 #endif /* __ASSEMBLY__ */ diff --git a/arch/arm/kernel/hyp-stub.S b/arch/arm/kernel/hyp-stub.S index b20ca8815911..e637854335aa 100644 --- a/arch/arm/kernel/hyp-stub.S +++ b/arch/arm/kernel/hyp-stub.S @@ -216,7 +216,10 @@ __hyp_stub_do_trap: bne 1f bx r1 -1: ldr r0, =HVC_STUB_ERR +1: teq r0, #HVC_RESET_VECTORS + beq __hyp_stub_exit + + ldr r0, =HVC_STUB_ERR __hyp_stub_exit: __ERET @@ -264,6 +267,12 @@ ENTRY(__hyp_soft_restart) ret lr ENDPROC(__hyp_soft_restart) +ENTRY(__hyp_reset_vectors) + mov r0, #HVC_RESET_VECTORS + __HVC(0) + ret lr +ENDPROC(__hyp_reset_vectors) + #ifndef ZIMAGE .align 2 .L__boot_cpu_mode_offset: |