diff mbox series

[RFC,4/8] xen/arm: add SVE exception class handling

Message ID 20230111143826.3224-5-luca.fancellu@arm.com (mailing list archive)
State Superseded
Headers show
Series SVE feature for arm guests | expand

Commit Message

Luca Fancellu Jan. 11, 2023, 2:38 p.m. UTC 
SVE has a new exception class with code 0x19, introduce the new code
and handle the exception.

Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
 xen/arch/arm/include/asm/processor.h |  1 +
 xen/arch/arm/traps.c                 | 12 ++++++++++++
 2 files changed, 13 insertions(+)
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Patch

diff --git a/xen/arch/arm/include/asm/processor.h b/xen/arch/arm/include/asm/processor.h
index 0e38926b94db..625c2bd0cd6c 100644
--- a/xen/arch/arm/include/asm/processor.h
+++ b/xen/arch/arm/include/asm/processor.h
@@ -426,6 +426,7 @@ 
 #define HSR_EC_HVC64                0x16
 #define HSR_EC_SMC64                0x17
 #define HSR_EC_SYSREG               0x18
+#define HSR_EC_SVE                  0x19
 #endif
 #define HSR_EC_INSTR_ABORT_LOWER_EL 0x20
 #define HSR_EC_INSTR_ABORT_CURR_EL  0x21
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 45163fd3afb0..66e07197aea5 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2168,6 +2168,13 @@  void do_trap_guest_sync(struct cpu_user_regs *regs)
         perfc_incr(trap_sysreg);
         do_sysreg(regs, hsr);
         break;
+    case HSR_EC_SVE:
+        GUEST_BUG_ON(regs_mode_is_32bit(regs));
+        gprintk(XENLOG_WARNING,
+                "Domain id %d tried to use SVE while not allowed\n",
+                current->domain->domain_id);
+        inject_undef_exception(regs, hsr);
+        break;
 #endif
 
     case HSR_EC_INSTR_ABORT_LOWER_EL:
@@ -2197,6 +2204,11 @@  void do_trap_hyp_sync(struct cpu_user_regs *regs)
     case HSR_EC_BRK:
         do_trap_brk(regs, hsr);
         break;
+    case HSR_EC_SVE:
+        /* An SVE exception is a bug somewhere in hypervisor code */
+        printk("SVE trap at EL2.\n");
+        do_unexpected_trap("Hypervisor", regs);
+        break;
 #endif
     case HSR_EC_DATA_ABORT_CURR_EL:
     case HSR_EC_INSTR_ABORT_CURR_EL: