[PATCH v18 5/6] target-arm: kvm64: inject synchronous External Abort

[Xiang Zheng <zhengxiang9@huawei.com>]

From: Dongjiu Geng <gengdongjiu@huawei.com>

Introduce kvm_inject_arm_sea() function in which we will setup the type
of exception and the syndrome information in order to inject a virtual
synchronous external abort. When switching to guest, it will jump to the
synchronous external abort vector table entry.

The ESR_ELx.DFSC is set to synchronous external abort(0x10), and
ESR_ELx.FnV is set to not valid(0x1), which will tell guest that FAR is
not valid and hold an UNKNOWN value. These values will be set to KVM
register structures through KVM_SET_ONE_REG IOCTL.

Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com>
Signed-off-by: Xiang Zheng <zhengxiang9@huawei.com>
---
 target/arm/helper.c     |  2 +-
 target/arm/internals.h  |  5 +++--
 target/arm/kvm64.c      | 34 ++++++++++++++++++++++++++++++++++
 target/arm/tlb_helper.c |  2 +-
 4 files changed, 39 insertions(+), 4 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 507026c915..a13baeb085 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -3005,7 +3005,7 @@ static uint64_t do_ats_write(CPUARMState *env, uint64_t value,
              * Report exception with ESR indicating a fault due to a
              * translation table walk for a cache maintenance instruction.
              */
-            syn = syn_data_abort_no_iss(current_el == target_el,
+            syn = syn_data_abort_no_iss(current_el == target_el, 0,
                                         fi.ea, 1, fi.s1ptw, 1, fsc);
             env->exception.vaddress = value;
             env->exception.fsr = fsr;
diff --git a/target/arm/internals.h b/target/arm/internals.h
index 232d963875..98cde702ad 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -451,13 +451,14 @@ static inline uint32_t syn_insn_abort(int same_el, int ea, int s1ptw, int fsc)
         | ARM_EL_IL | (ea << 9) | (s1ptw << 7) | fsc;
 }
 
-static inline uint32_t syn_data_abort_no_iss(int same_el,
+static inline uint32_t syn_data_abort_no_iss(int same_el, int fnv,
                                              int ea, int cm, int s1ptw,
                                              int wnr, int fsc)
 {
     return (EC_DATAABORT << ARM_EL_EC_SHIFT) | (same_el << ARM_EL_EC_SHIFT)
            | ARM_EL_IL
-           | (ea << 9) | (cm << 8) | (s1ptw << 7) | (wnr << 6) | fsc;
+           | (fnv << 10) | (ea << 9) | (cm << 8) | (s1ptw << 7)
+           | (wnr << 6) | fsc;
 }
 
 static inline uint32_t syn_data_abort_with_iss(int same_el,
diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
index 28f6db57d5..bf6edaa3f6 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -710,6 +710,40 @@ int kvm_arm_cpreg_level(uint64_t regidx)
     return KVM_PUT_RUNTIME_STATE;
 }
 
+/* Inject synchronous external abort */
+static void kvm_inject_arm_sea(CPUState *c)
+{
+    ARMCPU *cpu = ARM_CPU(c);
+    CPUARMState *env = &cpu->env;
+    CPUClass *cc = CPU_GET_CLASS(c);
+    uint32_t esr;
+    bool same_el;
+
+    /**
+     * Set the exception type to synchronous data abort
+     * and the target exception Level to EL1.
+     */
+    c->exception_index = EXCP_DATA_ABORT;
+    env->exception.target_el = 1;
+
+    /*
+     * Set the DFSC to synchronous external abort and set FnV to not valid,
+     * this will tell guest the FAR_ELx is UNKNOWN for this abort.
+     */
+
+    /* This exception comes from lower or current exception level. */
+    same_el = arm_current_el(env) == env->exception.target_el;
+    esr = syn_data_abort_no_iss(same_el, 1, 0, 0, 0, 0, 0x10);
+
+    env->exception.syndrome = esr;
+
+    /**
+     * The vcpu thread already hold BQL, so no need hold again when
+     * calling do_interrupt
+     */
+    cc->do_interrupt(c);
+}
+
 #define AARCH64_CORE_REG(x)   (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
                  KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x))
 
diff --git a/target/arm/tlb_helper.c b/target/arm/tlb_helper.c
index 5feb312941..499672ebbc 100644
--- a/target/arm/tlb_helper.c
+++ b/target/arm/tlb_helper.c
@@ -33,7 +33,7 @@ static inline uint32_t merge_syn_data_abort(uint32_t template_syn,
      * ISV field.
      */
     if (!(template_syn & ARM_EL_ISV) || target_el != 2 || s1ptw) {
-        syn = syn_data_abort_no_iss(same_el,
+        syn = syn_data_abort_no_iss(same_el, 0,
                                     ea, 0, s1ptw, is_write, fsc);
     } else {
         /*
-- 
2.19.1