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[PATCH 3/4] xen/arm: traps: enter the SP_EL0 vector group for an exception at EL1t
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Stefano Stabellini <stefano.stabellini@xxxxxxx>
- Date: Fri, 6 Nov 2026 18:14:40 -0800
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- Cc: <stefano.stabellini@xxxxxxx>, Julien Grall <julien@xxxxxxx>, "Bertrand Marquis" <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Sat, 07 Nov 2026 02:15:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
An exception taken from the current level is delivered to the SP_EL0
vector group (offset 0x000) when the guest was at EL1t, and to the
SP_ELx group (0x200) only at EL1h (ARM DDI 0487A.k D1.10.2, Table
D1-7). exception_handler64() used 0x200 for both.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
Cc: Julien Grall <julien@xxxxxxx>
Cc: Bertrand Marquis <bertrand.marquis@xxxxxxx>
Cc: Michal Orzel <michal.orzel@xxxxxxx>
Cc: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
---
xen/arch/arm/traps.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 6a5dcef2aa..f6abe25f74 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -532,7 +532,13 @@ static vaddr_t exception_handler64(struct cpu_user_regs
*regs, vaddr_t offset)
base += VECTOR64_LOWER32_BASE;
else if ( psr_mode(regs->cpsr,PSR_MODE_EL0t) )
base += VECTOR64_LOWER64_BASE;
- else /* Otherwise must be from kernel mode */
+ /*
+ * Otherwise must be from kernel mode. The current EL group is chosen by
+ * the stack pointer in use (ARM DDI 0487A.k D1.10.2, Table D1-7).
+ */
+ else if ( psr_mode(regs->cpsr,PSR_MODE_EL1t) )
+ base += VECTOR64_CURRENT_SP0_BASE;
+ else
base += VECTOR64_CURRENT_SPx_BASE;
return base + offset;
--
2.43.0
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