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ARM: hyp-stub: Implement HVC_RESET_VECTORS stub hypercall

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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>
This commit is contained in:
Marc Zyngier 2017-04-03 19:37:52 +01:00 committed by Christoffer Dall
parent 4c70cf07ce
commit 7d1bf4e057
2 changed files with 13 additions and 1 deletions
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3
arch/arm/include/asm/virt.h
View file

@ -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__ */

11
arch/arm/kernel/hyp-stub.S
View file

@ -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: