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[v4,04/13] KVM: arm64: nVHE: Add EL2h sync exception handler

Message ID 20240529121251.1993135-5-ptosi@google.com (mailing list archive)
State New
Headers show
Series KVM: arm64: Add support for hypervisor kCFI | expand

Commit Message

Pierre-Clément Tosi May 29, 2024, 12:12 p.m. UTC 
Introduce a handler for EL2h synchronous exceptions distinct from
handlers for other "invalid" exceptions when running with the nVHE host
vector. This will allow a future patch to handle kCFI (synchronous)
errors without affecting other classes of exceptions.

Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
---
 arch/arm64/kvm/hyp/nvhe/host.S | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

Comments

Will Deacon June 3, 2024, 2:32 p.m. UTC | #1 
On Wed, May 29, 2024 at 01:12:10PM +0100, Pierre-Clément Tosi wrote:
> Introduce a handler for EL2h synchronous exceptions distinct from
> handlers for other "invalid" exceptions when running with the nVHE host
> vector. This will allow a future patch to handle kCFI (synchronous)
> errors without affecting other classes of exceptions.
> 
> Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
> ---
>  arch/arm64/kvm/hyp/nvhe/host.S | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)

Acked-by: Will Deacon <will@kernel.org>

Will
diff mbox series

Patch

diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S
index 71fb311b4c0e..bc0a73d9fcd0 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_vect handler:req
 	.align 7
 
 	/*
@@ -203,7 +203,7 @@  SYM_FUNC_END(__host_hvc)
 	 * been partially clobbered by __host_enter.
 	 */
 	stp	x0, x1, [sp, #-16]!
-	b	__guest_exit_panic
+	b	\handler
 
 .L__hyp_sp_overflow\@:
 	/* Switch to the overflow stack */
@@ -213,6 +213,10 @@  SYM_FUNC_END(__host_hvc)
 	ASM_BUG()
 .endm
 
+.macro host_el2_sync_vect
+	__host_el2_vect __guest_exit_panic
+.endm
+
 .macro invalid_host_el1_vect
 	.align 7
 	mov	x0, xzr		/* restore_host = false */
@@ -222,6 +226,10 @@  SYM_FUNC_END(__host_hvc)
 	b	__hyp_do_panic
 .endm
 
+.macro invalid_host_el2_vect
+	__host_el2_vect __guest_exit_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
@@ -239,7 +247,7 @@  SYM_CODE_START(__kvm_hyp_host_vector)
 	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