[RFC PATCH v1 04/19] target/i386/hvf: introduce x86_emul_ops

[Wei Liu <liuwe@linux.microsoft.com>]

This will be used to remove HVF specific code from the instruction emulator.

For now we only introduce two hooks for x86_decode.c. More hooks will be added
when the code is refactored.

The emulator initialization function now takes in a pointer to the ops structure.

Signed-off-by: Wei Liu <liuwe@linux.microsoft.com>
---
 target/i386/hvf/hvf.c     | 20 +++++++++++++++++++-
 target/i386/hvf/x86_emu.c |  5 ++++-
 target/i386/hvf/x86_emu.h | 10 +++++++++-
 3 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/target/i386/hvf/hvf.c b/target/i386/hvf/hvf.c
index 1ecb6993ba..e1e7cc3b7d 100644
--- a/target/i386/hvf/hvf.c
+++ b/target/i386/hvf/hvf.c
@@ -228,6 +228,24 @@ hv_return_t hvf_arch_vm_create(MachineState *ms, uint32_t pa_range)
     return hv_vm_create(HV_VM_DEFAULT);
 }
 
+static void hvf_read_segment_descriptor(CPUState *s, struct x86_segment_descriptor *desc,
+                                        X86Seg seg)
+{
+    struct vmx_segment vmx_segment;
+    vmx_read_segment_descriptor(s, &vmx_segment, seg);
+    vmx_segment_to_x86_descriptor(s, &vmx_segment, desc);
+}
+
+static void hvf_read_mem(CPUState *cpu, void *data, target_ulong gva, int bytes)
+{
+    vmx_read_mem(cpu, data, gva, bytes);
+}
+
+static const struct x86_emul_ops hvf_x86_emul_ops = {
+    .read_mem = hvf_read_mem,
+    .read_segment_descriptor = hvf_read_segment_descriptor,
+};
+
 int hvf_arch_init_vcpu(CPUState *cpu)
 {
     X86CPU *x86cpu = X86_CPU(cpu);
@@ -236,7 +254,7 @@ int hvf_arch_init_vcpu(CPUState *cpu)
     int r;
     uint64_t reqCap;
 
-    init_emu();
+    init_emu(&hvf_x86_emul_ops);
     init_decoder();
 
     if (hvf_state->hvf_caps == NULL) {
diff --git a/target/i386/hvf/x86_emu.c b/target/i386/hvf/x86_emu.c
index 2c7da10c1d..96447ea2c0 100644
--- a/target/i386/hvf/x86_emu.c
+++ b/target/i386/hvf/x86_emu.c
@@ -1444,6 +1444,8 @@ static struct cmd_handler {
 
 static struct cmd_handler _cmd_handler[X86_DECODE_CMD_LAST];
 
+const struct x86_emul_ops *emul_ops;
+
 static void init_cmd_handler(void)
 {
     int i;
@@ -1516,7 +1518,8 @@ bool exec_instruction(CPUX86State *env, struct x86_decode *ins)
     return true;
 }
 
-void init_emu(void)
+void init_emu(const struct x86_emul_ops *o)
 {
+    emul_ops = o;
     init_cmd_handler();
 }
diff --git a/target/i386/hvf/x86_emu.h b/target/i386/hvf/x86_emu.h
index 8bd97608c4..8f4f8f1eca 100644
--- a/target/i386/hvf/x86_emu.h
+++ b/target/i386/hvf/x86_emu.h
@@ -23,7 +23,15 @@
 #include "x86_decode.h"
 #include "cpu.h"
 
-void init_emu(void);
+struct x86_emul_ops {
+    void (*read_mem)(CPUState *cpu, void *data, target_ulong addr, int bytes);
+    void (*read_segment_descriptor)(CPUState *cpu, struct x86_segment_descriptor *desc,
+                                    enum X86Seg seg);
+};
+
+extern const struct x86_emul_ops *emul_ops;
+
+void init_emu(const struct x86_emul_ops *ops);
 bool exec_instruction(CPUX86State *env, struct x86_decode *ins);
 
 void load_regs(CPUState *cpu);
-- 
2.39.5 (Apple Git-154)