[PATCH 05/10] KVM: arm64: nVHE: Add EL2 sync exception handler

[Pierre-Clément Tosi]

Introduce handlers for EL2{t,h} synchronous exceptions distinct from
handlers for other "invalid" exceptions when running with the nVHE host
vector. This will allow a future patch to handle CFI (synchronous)
errors without affecting other classes of exceptions.

Remove superfluous SP overflow check from the non-synchronous handlers.

Signed-off-by: Pierre-Clément Tosi <ptosi at google.com>
---
 arch/arm64/kvm/hyp/nvhe/host.S | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S
index 27c989c4976d..1b9111c2b480 100644
--- a/arch/arm64/kvm/hyp/nvhe/host.S
+++ b/arch/arm64/kvm/hyp/nvhe/host.S
@@ -183,7 +183,7 @@ SYM_FUNC_END(__host_hvc)
 .endif
 .endm
 
-.macro invalid_host_el2_vect
+.macro host_el2_sync_vect
 	.align 7
 
 	/*
@@ -221,6 +221,11 @@ SYM_FUNC_END(__host_hvc)
 	b	__hyp_do_panic
 .endm
 
+.macro invalid_host_el2_vect
+	.align 7
+	b	__hyp_panic
+.endm
+
 /*
  * The host vector does not use an ESB instruction in order to avoid consuming
  * SErrors that should only be consumed by the host. Guest entry is deferred by
@@ -233,12 +238,12 @@ SYM_FUNC_END(__host_hvc)
  */
 	.align 11
 SYM_CODE_START(__kvm_hyp_host_vector)
-	invalid_host_el2_vect			// Synchronous EL2t
+	host_el2_sync_vect			// Synchronous EL2t
 	invalid_host_el2_vect			// IRQ EL2t
 	invalid_host_el2_vect			// FIQ EL2t
 	invalid_host_el2_vect			// Error EL2t
 
-	invalid_host_el2_vect			// Synchronous EL2h
+	host_el2_sync_vect			// Synchronous EL2h
 	invalid_host_el2_vect			// IRQ EL2h
 	invalid_host_el2_vect			// FIQ EL2h
 	invalid_host_el2_vect			// Error EL2h

-- 
Pierre