[PATCH for-4.5 v10 16/19] xen/arm: Instruction prefetch abort (X) mem_event handling

[Tamas K Lengyel <tklengyel@sec.in.tum.de>]

Add missing structure definition for iabt and update the trap handling
mechanism to only inject the exception if the mem_access checker
decides to do so.

Signed-off-by: Tamas K Lengyel <tklengyel@sec.in.tum.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
v10: - Minor comment fix for describing s1ptw.
v8: - Revert to arch specific p2m_mem_access_check.
    - Retire iabt_fsc enum and use FSC_FLT instead.
    - Complete the struct definition of hsr_iabt.
v7: - Use the new common mem_access_check.
v6: - Make npfec a const.
v4: - Don't mark instruction fetch violation as read violation.
    - Use new struct npfec to pass violation info.
v2: - Add definition for instruction abort instruction fetch status codes
       (enum iabt_ifsc) and only call p2m_mem_access_check for traps triggered
       for permission violations.
---
 xen/arch/arm/traps.c            | 31 +++++++++++++++++++++++++++++--
 xen/include/asm-arm/processor.h | 11 +++++++++++
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index ea695f9..256fb67 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1846,8 +1846,35 @@ done:
 static void do_trap_instr_abort_guest(struct cpu_user_regs *regs,
                                       union hsr hsr)
 {
-    register_t addr = READ_SYSREG(FAR_EL2);
-    inject_iabt_exception(regs, addr, hsr.len);
+    struct hsr_iabt iabt = hsr.iabt;
+    int rc;
+    paddr_t gpa;
+    register_t gva = READ_SYSREG(FAR_EL2);
+
+    rc = gva_to_ipa(gva, &gpa);
+    if ( -EFAULT == rc )
+        return;
+
+    switch ( iabt.ifsc & 0x3f )
+    {
+    case FSC_FLT_PERM ... FSC_FLT_PERM + 3:
+    {
+        const struct npfec npfec = {
+            .insn_fetch = 1,
+            .gla_valid = 1,
+            .kind = iabt.s1ptw ? npfec_kind_in_gpt : npfec_kind_with_gla
+        };
+
+        rc = p2m_mem_access_check(gpa, gva, npfec);
+
+        /* Trap was triggered by mem_access, work here is done */
+        if ( !rc )
+            return;
+    }
+    break;
+    }
+
+    inject_iabt_exception(regs, gva, hsr.len);
 }
 
 static void do_trap_data_abort_guest(struct cpu_user_regs *regs,
diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index d74b6f4..da63ccd 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -432,6 +432,17 @@ union hsr {
     } sysreg; /* HSR_EC_SYSREG */
 #endif
 
+    struct hsr_iabt {
+        unsigned long ifsc:6;  /* Instruction fault status code */
+        unsigned long res0:1;
+        unsigned long s1ptw:1; /* Stage 2 fault during stage 1 translation */
+        unsigned long res1:1;
+        unsigned long eat:1;   /* External abort type */
+        unsigned long res2:15;
+        unsigned long len:1;   /* Instruction length */
+        unsigned long ec:6;    /* Exception Class */
+    } iabt; /* HSR_EC_INSTR_ABORT_* */
+
     struct hsr_dabt {
         unsigned long dfsc:6;  /* Data Fault Status Code */
         unsigned long write:1; /* Write / not Read */
-- 
2.1.0