[PATCH v5 04/12] xen/arm: add SVE exception class handling

[Luca Fancellu <luca.fancellu@xxxxxxx>]

SVE has a new exception class with code 0x19, introduce the new code
and handle the exception.

Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
---
Changes from v4:
 - No changes
Changes from v3:
 - No changes
Changes from v2:
 - No changes
Changes from v1:
 - No changes
Changes from RFC:
 - No changes
---
 xen/arch/arm/include/asm/processor.h |  1 +
 xen/arch/arm/traps.c                 | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/xen/arch/arm/include/asm/processor.h 
b/xen/arch/arm/include/asm/processor.h
index bc683334125c..7e42ff8811fc 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 a78a99ddadd0..c2e30feafd5a 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2160,6 +2160,13 @@ 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:
@@ -2189,6 +2196,11 @@ 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:
-- 
2.34.1