[Qemu-devel] [PATCH V4] kvm: Add a new machine property kvm-type

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

Targets like ppc64 support different typed of KVM, one which use
hypervisor mode and the other which doesn't. Add a new machine
property kvm-type that helps in selecting the respective ones
We also add a new QEMUMachine callback get_vm_type that helps
in mapping the string representation of kvm type specified.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
Changes from V3:
* Rename property name from kvm_type to kvm-type

 hw/ppc/spapr.c         | 19 +++++++++++++++++++
 include/hw/boards.h    |  3 +++
 include/hw/xen/xen.h   |  3 ++-
 include/sysemu/kvm.h   |  4 ++--
 include/sysemu/qtest.h |  3 ++-
 kvm-all.c              | 16 +++++++++++++---
 kvm-stub.c             |  4 +++-
 qtest.c                |  2 +-
 vl.c                   | 14 +++++++++-----
 xen-all.c              |  2 +-
 xen-stub.c             |  2 +-
 11 files changed, 56 insertions(+), 16 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 7e53a5f97781..267a47d6cc4d 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1357,6 +1357,24 @@ static void ppc_spapr_init(QEMUMachineInitArgs *args)
     assert(spapr->fdt_skel != NULL);
 }
 
+static int spapr_kvm_type(const char *vm_type)
+{
+    if (!vm_type) {
+        return 0;
+    }
+
+    if (!strcmp(vm_type, "HV")) {
+        return 1;
+    }
+
+    if (!strcmp(vm_type, "PR")) {
+        return 2;
+    }
+
+    hw_error("Unknown kvm-type specified '%s'", vm_type);
+    exit(1);
+}
+
 static QEMUMachine spapr_machine = {
     .name = "pseries",
     .desc = "pSeries Logical Partition (PAPR compliant)",
@@ -1367,6 +1385,7 @@ static QEMUMachine spapr_machine = {
     .max_cpus = MAX_CPUS,
     .no_parallel = 1,
     .default_boot_order = NULL,
+    .kvm_type = spapr_kvm_type,
 };
 
 static void spapr_machine_init(void)
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 2151460f9ec4..89eb6651e2c7 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -24,6 +24,8 @@ typedef void QEMUMachineResetFunc(void);
 
 typedef void QEMUMachineHotAddCPUFunc(const int64_t id, Error **errp);
 
+typedef int QEMUMachineGetKvmtypeFunc(const char *arg);
+
 struct QEMUMachine {
     const char *name;
     const char *alias;
@@ -31,6 +33,7 @@ struct QEMUMachine {
     QEMUMachineInitFunc *init;
     QEMUMachineResetFunc *reset;
     QEMUMachineHotAddCPUFunc *hot_add_cpu;
+    QEMUMachineGetKvmtypeFunc *kvm_type;
     BlockInterfaceType block_default_type;
     int max_cpus;
     unsigned int no_serial:1,
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index e1f88bf9cf8f..acc3d74c0911 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -36,7 +36,8 @@ void xen_cmos_set_s3_resume(void *opaque, int irq, int level);
 
 qemu_irq *xen_interrupt_controller_init(void);
 
-int xen_init(void);
+typedef struct QEMUMachine QEMUMachine;
+int xen_init(QEMUMachine *machine);
 int xen_hvm_init(MemoryRegion **ram_memory);
 void xenstore_store_pv_console_info(int i, struct CharDriverState *chr);
 
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 3b25f27a7cc5..400a2682923e 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -151,8 +151,8 @@ typedef struct KVMState KVMState;
 extern KVMState *kvm_state;
 
 /* external API */
-
-int kvm_init(void);
+typedef struct QEMUMachine QEMUMachine;
+int kvm_init(QEMUMachine *machine);
 
 int kvm_has_sync_mmu(void);
 int kvm_has_vcpu_events(void);
diff --git a/include/sysemu/qtest.h b/include/sysemu/qtest.h
index 112a661ac4b0..7185174a39b2 100644
--- a/include/sysemu/qtest.h
+++ b/include/sysemu/qtest.h
@@ -23,7 +23,8 @@ static inline bool qtest_enabled(void)
     return qtest_allowed;
 }
 
-int qtest_init_accel(void);
+typedef struct QEMUMachine QEMUMachine;
+int qtest_init_accel(QEMUMachine *machine);
 void qtest_init(const char *qtest_chrdev, const char *qtest_log);
 
 static inline int qtest_available(void)
diff --git a/kvm-all.c b/kvm-all.c
index 393775459d9f..57472804fe44 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -35,6 +35,8 @@
 #include "qemu/event_notifier.h"
 #include "trace.h"
 
+#include "hw/boards.h"
+
 /* This check must be after config-host.h is included */
 #ifdef CONFIG_EVENTFD
 #include <sys/eventfd.h>
@@ -1352,7 +1354,7 @@ static int kvm_max_vcpus(KVMState *s)
     return (ret) ? ret : kvm_recommended_vcpus(s);
 }
 
-int kvm_init(void)
+int kvm_init(QEMUMachine *machine)
 {
     static const char upgrade_note[] =
         "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
@@ -1369,7 +1371,8 @@ int kvm_init(void)
     KVMState *s;
     const KVMCapabilityInfo *missing_cap;
     int ret;
-    int i;
+    int i, type = 0;
+    const char *kvm_type;
 
     s = g_malloc0(sizeof(KVMState));
 
@@ -1442,7 +1445,14 @@ int kvm_init(void)
         nc++;
     }
 
-    s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
+    kvm_type = qemu_opt_get(qemu_get_machine_opts(), "kvm-type");
+    if (machine->kvm_type) {
+        type = machine->kvm_type(kvm_type);
+    } else if (kvm_type) {
+        fprintf(stderr, "Invalid argument kvm-type=%s\n", kvm_type);
+        goto err;
+    }
+    s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, type);
     if (s->vmfd < 0) {
 #ifdef TARGET_S390X
         fprintf(stderr, "Please add the 'switch_amode' kernel parameter to "
diff --git a/kvm-stub.c b/kvm-stub.c
index e979f76d0782..c27b69076572 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -19,6 +19,8 @@
 #include "hw/pci/msi.h"
 #endif
 
+#include "hw/boards.h"
+
 KVMState *kvm_state;
 bool kvm_kernel_irqchip;
 bool kvm_async_interrupts_allowed;
@@ -34,7 +36,7 @@ int kvm_init_vcpu(CPUState *cpu)
     return -ENOSYS;
 }
 
-int kvm_init(void)
+int kvm_init(QEMUMachine *machine)
 {
     return -ENOSYS;
 }
diff --git a/qtest.c b/qtest.c
index dcf130122961..b156225e7278 100644
--- a/qtest.c
+++ b/qtest.c
@@ -500,7 +500,7 @@ static void qtest_event(void *opaque, int event)
     }
 }
 
-int qtest_init_accel(void)
+int qtest_init_accel(QEMUMachine *machine)
 {
     configure_icount("0");
 
diff --git a/vl.c b/vl.c
index 7511e7036c1f..c2689494596e 100644
--- a/vl.c
+++ b/vl.c
@@ -430,6 +430,10 @@ static QemuOptsList qemu_machine_opts = {
             .name = "firmware",
             .type = QEMU_OPT_STRING,
             .help = "firmware image",
+        },{
+            .name = "kvm-type",
+            .type = QEMU_OPT_STRING,
+            .help = "Specifies the KVM virtualization mode (HV, PR)",
         },
         { /* End of list */ }
     },
@@ -2608,7 +2612,7 @@ static QEMUMachine *machine_parse(const char *name)
     exit(!name || !is_help_option(name));
 }
 
-static int tcg_init(void)
+static int tcg_init(QEMUMachine *machine)
 {
     tcg_exec_init(tcg_tb_size * 1024 * 1024);
     return 0;
@@ -2618,7 +2622,7 @@ static struct {
     const char *opt_name;
     const char *name;
     int (*available)(void);
-    int (*init)(void);
+    int (*init)(QEMUMachine *);
     bool *allowed;
 } accel_list[] = {
     { "tcg", "tcg", tcg_available, tcg_init, &tcg_allowed },
@@ -2627,7 +2631,7 @@ static struct {
     { "qtest", "QTest", qtest_available, qtest_init_accel, &qtest_allowed },
 };
 
-static int configure_accelerator(void)
+static int configure_accelerator(QEMUMachine *machine)
 {
     const char *p;
     char buf[10];
@@ -2654,7 +2658,7 @@ static int configure_accelerator(void)
                     continue;
                 }
                 *(accel_list[i].allowed) = true;
-                ret = accel_list[i].init();
+                ret = accel_list[i].init(machine);
                 if (ret < 0) {
                     init_failed = true;
                     fprintf(stderr, "failed to initialize %s: %s\n",
@@ -4048,7 +4052,7 @@ int main(int argc, char **argv, char **envp)
         exit(0);
     }
 
-    configure_accelerator();
+    configure_accelerator(machine);
 
     if (qtest_chrdev) {
         qtest_init(qtest_chrdev, qtest_log);
diff --git a/xen-all.c b/xen-all.c
index 4a594bdd9b56..ba3473901e6a 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -1001,7 +1001,7 @@ static void xen_exit_notifier(Notifier *n, void *data)
     xs_daemon_close(state->xenstore);
 }
 
-int xen_init(void)
+int xen_init(QEMUMachine *machine)
 {
     xen_xc = xen_xc_interface_open(0, 0, 0);
     if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
diff --git a/xen-stub.c b/xen-stub.c
index ad189a6df8c2..59927cb5d635 100644
--- a/xen-stub.c
+++ b/xen-stub.c
@@ -47,7 +47,7 @@ qemu_irq *xen_interrupt_controller_init(void)
     return NULL;
 }
 
-int xen_init(void)
+int xen_init(QEMUMachine *machine)
 {
     return -ENOSYS;
 }
-- 
1.8.3.2