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arm64: KVM: Implement HVC_RESET_VECTORS stub hypercall in the init code

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In order to restore HYP mode to its original condition, KVM currently
implements __kvm_hyp_reset(). As we're moving towards a hyp-stub
defined API, it becomes necessary to implement HVC_RESET_VECTORS.

This patch adds the HVC_RESET_VECTORS hypercall to the KVM init
code, which so far lacked any form of hypercall support.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: James Morse <james.morse@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 19:37:40 +01:00 committed by Christoffer Dall
parent fd0e0c6170
commit fb1b4e01d2
1 changed files with 13 additions and 0 deletions
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13
arch/arm64/kvm/hyp-init.S
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@ -22,6 +22,7 @@
#include <asm/kvm_mmu.h>
#include <asm/pgtable-hwdef.h>
#include <asm/sysreg.h>
#include <asm/virt.h>
.text
.pushsection .hyp.idmap.text, "ax"
@ -58,6 +59,9 @@ __invalid:
* x2: HYP vectors
*/
__do_hyp_init:
/* Check for a stub HVC call */
cmp x0, #HVC_STUB_HCALL_NR
b.lo __kvm_handle_stub_hvc
msr ttbr0_el2, x0
@ -119,6 +123,9 @@ __do_hyp_init:
eret
ENDPROC(__kvm_hyp_init)
ENTRY(__kvm_handle_stub_hvc)
cmp x0, #HVC_RESET_VECTORS
b.ne 1f
/*
* Reset kvm back to the hyp stub.
*/
@ -133,9 +140,15 @@ ENTRY(__kvm_hyp_reset)
/* Install stub vectors */
adr_l x0, __hyp_stub_vectors
msr vbar_el2, x0
b exit
1: /* Bad stub call */
ldr x0, =HVC_STUB_ERR
exit:
eret
ENDPROC(__kvm_hyp_reset)
ENDPROC(__kvm_handle_stub_hvc)
.ltorg