[PATCH v4 08/28] arm64: KVM: Convert __cpu_reset_hyp_mode to using __hyp_reset_vectors

Marc Zyngier
2017-03-21T19:20:38Z

We are now able to use the hyp stub to reset HYP mode. Time to
kiss __kvm_hyp_reset goodbye, and use __hyp_reset_vectors.

Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm64/include/asm/kvm_asm.h | 1 -
arch/arm64/include/asm/kvm_host.h | 3 +--
arch/arm64/kvm/hyp-init.S | 2 --
arch/arm64/kvm/hyp/hyp-entry.S | 15 ---------------
4 files changed, 1 insertion(+), 20 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index ec3553eb9349..3e242f6613b3 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -47,7 +47,6 @@ struct kvm_vcpu;

extern char __kvm_hyp_init[];
extern char __kvm_hyp_init_end[];
-extern char __kvm_hyp_reset[];

extern char __kvm_hyp_vector[];

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index e7705e7bb07b..0355dd109956 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -362,11 +362,10 @@ static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
__kvm_call_hyp((void *)pgd_ptr, hyp_stack_ptr, vector_ptr);
}

-void __kvm_hyp_teardown(void);
static inline void __cpu_reset_hyp_mode(unsigned long vector_ptr,
phys_addr_t phys_idmap_start)
{
- kvm_call_hyp(__kvm_hyp_teardown, phys_idmap_start);
+ __hyp_reset_vectors();
}

static inline void kvm_arch_hardware_unsetup(void) {}
diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
index 1d89995378e9..b53e95efc1c5 100644
--- a/arch/arm64/kvm/hyp-init.S
+++ b/arch/arm64/kvm/hyp-init.S
@@ -134,7 +134,6 @@ ENTRY(__kvm_handle_stub_hvc)
/*
* Reset kvm back to the hyp stub.
*/
-ENTRY(__kvm_hyp_reset)
/* We're now in idmap, disable MMU */
mrs x0, sctlr_el2
ldr x1, =SCTLR_ELx_FLAGS
@@ -151,7 +150,6 @@ ENTRY(__kvm_hyp_reset)

exit:
eret
-ENDPROC(__kvm_hyp_reset)
ENDPROC(__kvm_handle_stub_hvc)

.ltorg
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
index 4f34c5996f86..5170ce1021da 100644
--- a/arch/arm64/kvm/hyp/hyp-entry.S
+++ b/arch/arm64/kvm/hyp/hyp-entry.S
@@ -53,21 +53,6 @@ ENTRY(__vhe_hyp_call)
ret
ENDPROC(__vhe_hyp_call)

-/*
- * Compute the idmap address of __kvm_hyp_reset based on the idmap
- * start passed as a parameter, and jump there.
- *
- * x0: HYP phys_idmap_start
- */
-ENTRY(__kvm_hyp_teardown)
- mov x4, x0
- adr_l x3, __kvm_hyp_reset
-
- /* insert __kvm_hyp_reset()s offset into phys_idmap_start */
- bfi x4, x3, #0, #PAGE_SHIFT
- br x4
-ENDPROC(__kvm_hyp_teardown)
-
el1_sync: // Guest trapped into EL2
stp x0, x1, [sp, #-16]!

--
2.11.0