[PATCH v17 09/10] target-arm: kvm64: inject synchronous External Abort

[Dongjiu Geng <gengdongjiu@xxxxxxxxxx>]

Add synchronous external abort injection logic, setup
exception type and syndrome value. When switch 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 value will be set to KVM register structures through
KVM_SET_ONE_REG IOCTL.

Signed-off-by: Dongjiu Geng <gengdongjiu@xxxxxxxxxx>
---
 target/arm/internals.h |  5 +++--
 target/arm/kvm64.c     | 34 ++++++++++++++++++++++++++++++++++
 target/arm/op_helper.c |  2 +-
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/target/arm/internals.h b/target/arm/internals.h
index 587a1dd..4d67a91 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 e3ba149..c7bdc6a 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -697,6 +697,40 @@ 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/op_helper.c b/target/arm/op_helper.c
index 8698b4d..d43134a 100644
--- a/target/arm/op_helper.c
+++ b/target/arm/op_helper.c
@@ -109,7 +109,7 @@ 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 {
         /* Fields: IL, ISV, SAS, SSE, SRT, SF and AR come from the template
-- 
1.8.3.1