From: Julien Grall <julien.grall@arm.com>
Date: Thu, 15 Sep 2016 11:28:17 +0000 (+0100)
Subject: xen/arm: do_trap_instr_abort_guest: Move the IPA computation out of the switch
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~341
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https://%22%22/%22http:/www.example.com/cgi/%22https:/%22%22?a=commitdiff_plain;h=36770c9d2b6e846a8740f351b15890f7cb396191;p=xen.git

xen/arm: do_trap_instr_abort_guest: Move the IPA computation out of the switch

A follow-up patch will add more case to the switch that will require the
IPA. So move the computation out of the switch.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Tested-by: Tamas K Lengyel <tamas@tklengyel.com>
---

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 39a05fd154..a5a5384fc4 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2404,35 +2404,35 @@ static void do_trap_instr_abort_guest(struct cpu_user_regs *regs,
     int rc;
     register_t gva = READ_SYSREG(FAR_EL2);
     uint8_t fsc = hsr.iabt.ifsc & ~FSC_LL_MASK;
+    paddr_t gpa;
+
+    if ( hpfar_is_valid(hsr.iabt.s1ptw, fsc) )
+        gpa = get_faulting_ipa(gva);
+    else
+    {
+        /*
+         * Flush the TLB to make sure the DTLB is clear before
+         * doing GVA->IPA translation. If we got here because of
+         * an entry only present in the ITLB, this translation may
+         * still be inaccurate.
+         */
+        flush_tlb_local();
+
+        rc = gva_to_ipa(gva, &gpa, GV2M_READ);
+        if ( rc == -EFAULT )
+            return; /* Try again */
+    }
 
     switch ( fsc )
     {
     case FSC_FLT_PERM:
     {
-        paddr_t gpa;
         const struct npfec npfec = {
             .insn_fetch = 1,
             .gla_valid = 1,
             .kind = hsr.iabt.s1ptw ? npfec_kind_in_gpt : npfec_kind_with_gla
         };
 
-        if ( hpfar_is_valid(hsr.iabt.s1ptw, fsc) )
-            gpa = get_faulting_ipa(gva);
-        else
-        {
-            /*
-             * Flush the TLB to make sure the DTLB is clear before
-             * doing GVA->IPA translation. If we got here because of
-             * an entry only present in the ITLB, this translation may
-             * still be inaccurate.
-             */
-            flush_tlb_local();
-
-            rc = gva_to_ipa(gva, &gpa, GV2M_READ);
-            if ( rc == -EFAULT )
-                return; /* Try again */
-        }
-
         rc = p2m_mem_access_check(gpa, gva, npfec);
 
         /* Trap was triggered by mem_access, work here is done */