Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 196 insertions, 0 deletions

diff --git a/target/sparc/machine.c b/target/sparc/machine.c
new file mode 100644
index 000000000..917375c3a
--- /dev/null
+++ b/target/sparc/machine.c
@@ -0,0 +1,196 @@
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/exec-all.h"
+#include "qemu/timer.h"
+
+#include "migration/cpu.h"
+
+#ifdef TARGET_SPARC64
+static const VMStateDescription vmstate_cpu_timer = {
+    .name = "cpu_timer",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(frequency, CPUTimer),
+        VMSTATE_UINT32(disabled, CPUTimer),
+        VMSTATE_UINT64(disabled_mask, CPUTimer),
+        VMSTATE_UINT32(npt, CPUTimer),
+        VMSTATE_UINT64(npt_mask, CPUTimer),
+        VMSTATE_INT64(clock_offset, CPUTimer),
+        VMSTATE_TIMER_PTR(qtimer, CPUTimer),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+#define VMSTATE_CPU_TIMER(_f, _s)                             \
+    VMSTATE_STRUCT_POINTER(_f, _s, vmstate_cpu_timer, CPUTimer)
+
+static const VMStateDescription vmstate_trap_state = {
+    .name = "trap_state",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT64(tpc, trap_state),
+        VMSTATE_UINT64(tnpc, trap_state),
+        VMSTATE_UINT64(tstate, trap_state),
+        VMSTATE_UINT32(tt, trap_state),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static const VMStateDescription vmstate_tlb_entry = {
+    .name = "tlb_entry",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT64(tag, SparcTLBEntry),
+        VMSTATE_UINT64(tte, SparcTLBEntry),
+        VMSTATE_END_OF_LIST()
+    }
+};
+#endif
+
+static int get_psr(QEMUFile *f, void *opaque, size_t size,
+                   const VMStateField *field)
+{
+    SPARCCPU *cpu = opaque;
+    CPUSPARCState *env = &cpu->env;
+    uint32_t val = qemu_get_be32(f);
+
+    /* needed to ensure that the wrapping registers are correctly updated */
+    env->cwp = 0;
+    cpu_put_psr_raw(env, val);
+
+    return 0;
+}
+
+static int put_psr(QEMUFile *f, void *opaque, size_t size,
+                   const VMStateField *field, JSONWriter *vmdesc)
+{
+    SPARCCPU *cpu = opaque;
+    CPUSPARCState *env = &cpu->env;
+    uint32_t val;
+
+    val = cpu_get_psr(env);
+
+    qemu_put_be32(f, val);
+    return 0;
+}
+
+static const VMStateInfo vmstate_psr = {
+    .name = "psr",
+    .get = get_psr,
+    .put = put_psr,
+};
+
+static int cpu_pre_save(void *opaque)
+{
+    SPARCCPU *cpu = opaque;
+    CPUSPARCState *env = &cpu->env;
+
+    /* if env->cwp == env->nwindows - 1, this will set the ins of the last
+     * window as the outs of the first window
+     */
+    cpu_set_cwp(env, env->cwp);
+
+    return 0;
+}
+
+/* 32-bit SPARC retains migration compatibility with older versions
+ * of QEMU; 64-bit SPARC has had a migration break since then, so the
+ * versions are different.
+ */
+#ifndef TARGET_SPARC64
+#define SPARC_VMSTATE_VER 7
+#else
+#define SPARC_VMSTATE_VER 9
+#endif
+
+const VMStateDescription vmstate_sparc_cpu = {
+    .name = "cpu",
+    .version_id = SPARC_VMSTATE_VER,
+    .minimum_version_id = SPARC_VMSTATE_VER,
+    .minimum_version_id_old = SPARC_VMSTATE_VER,
+    .pre_save = cpu_pre_save,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINTTL_ARRAY(env.gregs, SPARCCPU, 8),
+        VMSTATE_UINT32(env.nwindows, SPARCCPU),
+        VMSTATE_VARRAY_MULTIPLY(env.regbase, SPARCCPU, env.nwindows, 16,
+                                vmstate_info_uinttl, target_ulong),
+        VMSTATE_CPUDOUBLE_ARRAY(env.fpr, SPARCCPU, TARGET_DPREGS),
+        VMSTATE_UINTTL(env.pc, SPARCCPU),
+        VMSTATE_UINTTL(env.npc, SPARCCPU),
+        VMSTATE_UINTTL(env.y, SPARCCPU),
+        {
+
+            .name = "psr",
+            .version_id = 0,
+            .size = sizeof(uint32_t),
+            .info = &vmstate_psr,
+            .flags = VMS_SINGLE,
+            .offset = 0,
+        },
+        VMSTATE_UINTTL(env.fsr, SPARCCPU),
+        VMSTATE_UINTTL(env.tbr, SPARCCPU),
+        VMSTATE_INT32(env.interrupt_index, SPARCCPU),
+        VMSTATE_UINT32(env.pil_in, SPARCCPU),
+#ifndef TARGET_SPARC64
+        /* MMU */
+        VMSTATE_UINT32(env.wim, SPARCCPU),
+        VMSTATE_UINT32_ARRAY(env.mmuregs, SPARCCPU, 32),
+        VMSTATE_UINT64_ARRAY(env.mxccdata, SPARCCPU, 4),
+        VMSTATE_UINT64_ARRAY(env.mxccregs, SPARCCPU, 8),
+        VMSTATE_UINT32(env.mmubpctrv, SPARCCPU),
+        VMSTATE_UINT32(env.mmubpctrc, SPARCCPU),
+        VMSTATE_UINT32(env.mmubpctrs, SPARCCPU),
+        VMSTATE_UINT64(env.mmubpaction, SPARCCPU),
+        VMSTATE_UINT64_ARRAY(env.mmubpregs, SPARCCPU, 4),
+#else
+        VMSTATE_UINT64(env.lsu, SPARCCPU),
+        VMSTATE_UINT64_ARRAY(env.immu.mmuregs, SPARCCPU, 16),
+        VMSTATE_UINT64_ARRAY(env.dmmu.mmuregs, SPARCCPU, 16),
+        VMSTATE_STRUCT_ARRAY(env.itlb, SPARCCPU, 64, 0,
+                             vmstate_tlb_entry, SparcTLBEntry),
+        VMSTATE_STRUCT_ARRAY(env.dtlb, SPARCCPU, 64, 0,
+                             vmstate_tlb_entry, SparcTLBEntry),
+        VMSTATE_UINT32(env.mmu_version, SPARCCPU),
+        VMSTATE_STRUCT_ARRAY(env.ts, SPARCCPU, MAXTL_MAX, 0,
+                             vmstate_trap_state, trap_state),
+        VMSTATE_UINT32(env.xcc, SPARCCPU),
+        VMSTATE_UINT32(env.asi, SPARCCPU),
+        VMSTATE_UINT32(env.pstate, SPARCCPU),
+        VMSTATE_UINT32(env.tl, SPARCCPU),
+        VMSTATE_UINT32(env.cansave, SPARCCPU),
+        VMSTATE_UINT32(env.canrestore, SPARCCPU),
+        VMSTATE_UINT32(env.otherwin, SPARCCPU),
+        VMSTATE_UINT32(env.wstate, SPARCCPU),
+        VMSTATE_UINT32(env.cleanwin, SPARCCPU),
+        VMSTATE_UINT64_ARRAY(env.agregs, SPARCCPU, 8),
+        VMSTATE_UINT64_ARRAY(env.bgregs, SPARCCPU, 8),
+        VMSTATE_UINT64_ARRAY(env.igregs, SPARCCPU, 8),
+        VMSTATE_UINT64_ARRAY(env.mgregs, SPARCCPU, 8),
+        VMSTATE_UINT64(env.fprs, SPARCCPU),
+        VMSTATE_UINT64(env.tick_cmpr, SPARCCPU),
+        VMSTATE_UINT64(env.stick_cmpr, SPARCCPU),
+        VMSTATE_CPU_TIMER(env.tick, SPARCCPU),
+        VMSTATE_CPU_TIMER(env.stick, SPARCCPU),
+        VMSTATE_UINT64(env.gsr, SPARCCPU),
+        VMSTATE_UINT32(env.gl, SPARCCPU),
+        VMSTATE_UINT64(env.hpstate, SPARCCPU),
+        VMSTATE_UINT64_ARRAY(env.htstate, SPARCCPU, MAXTL_MAX),
+        VMSTATE_UINT64(env.hintp, SPARCCPU),
+        VMSTATE_UINT64(env.htba, SPARCCPU),
+        VMSTATE_UINT64(env.hver, SPARCCPU),
+        VMSTATE_UINT64(env.hstick_cmpr, SPARCCPU),
+        VMSTATE_UINT64(env.ssr, SPARCCPU),
+        VMSTATE_CPU_TIMER(env.hstick, SPARCCPU),
+        /* On SPARC32 env.psrpil and env.cwp are migrated as part of the PSR */
+        VMSTATE_UINT32(env.psrpil, SPARCCPU),
+        VMSTATE_UINT32(env.cwp, SPARCCPU),
+#endif
+        VMSTATE_END_OF_LIST()
+    },
+};