[Qemu-devel] [PATCH v2] KVM: Use -cpu host as default on x86

[Alexander Graf]

When running QEMU without -cpu parameter, the user usually wants a sane
default. So far, we're using the qemu64/qemu32 CPU type, which basically
means "the maximum TCG can emulate".

That's a really good default when using TCG, but when running with KVM
we much rather want a default saying "the maximum KVM can support".

Fortunately we already have such a CPU type. It's called "host". All we
need to do is to select it by default when not getting a -cpu passed in.

This fixes a lot of subtile breakage in the GNU toolchain (libgmp) which
hicks up on QEMU's non-existent CPU models.

Signed-off-by: Alexander Graf <address@hidden>

---

v1 -> v2:

  - add fallback code for old versions, so we don't break -M pc-xxx
---
 hw/pc_piix.c |   40 +++++++++++++++++++++++++++++++++-------
 1 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 166c2fc..67f6ec9 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -79,7 +79,8 @@ static void pc_init1(MemoryRegion *system_memory,
                      const char *initrd_filename,
                      const char *cpu_model,
                      int pci_enabled,
-                     int kvmclock_enabled)
+                     int kvmclock_enabled,
+                     int may_cpu_host)
 {
     int i;
     ram_addr_t below_4g_mem_size, above_4g_mem_size;
@@ -101,6 +102,9 @@ static void pc_init1(MemoryRegion *system_memory,
     MemoryRegion *rom_memory;
     DeviceState *dev;
 
+    if (!cpu_model && kvm_enabled() && may_cpu_host) {
+        cpu_model = "host";
+    }
     pc_cpus_init(cpu_model);
 
     if (kvmclock_enabled) {
@@ -261,7 +265,21 @@ static void pc_init_pci(ram_addr_t ram_size,
              get_system_io(),
              ram_size, boot_device,
              kernel_filename, kernel_cmdline,
-             initrd_filename, cpu_model, 1, 1);
+             initrd_filename, cpu_model, 1, 1, 1);
+}
+
+static void pc_init_pci_oldcpu(ram_addr_t ram_size,
+                               const char *boot_device,
+                               const char *kernel_filename,
+                               const char *kernel_cmdline,
+                               const char *initrd_filename,
+                               const char *cpu_model)
+{
+    pc_init1(get_system_memory(),
+             get_system_io(),
+             ram_size, boot_device,
+             kernel_filename, kernel_cmdline,
+             initrd_filename, cpu_model, 1, 1, 0);
 }
 
 static void pc_init_pci_no_kvmclock(ram_addr_t ram_size,
@@ -275,7 +293,7 @@ static void pc_init_pci_no_kvmclock(ram_addr_t ram_size,
              get_system_io(),
              ram_size, boot_device,
              kernel_filename, kernel_cmdline,
-             initrd_filename, cpu_model, 1, 0);
+             initrd_filename, cpu_model, 1, 0, 0);
 }
 
 static void pc_init_isa(ram_addr_t ram_size,
@@ -291,7 +309,7 @@ static void pc_init_isa(ram_addr_t ram_size,
              get_system_io(),
              ram_size, boot_device,
              kernel_filename, kernel_cmdline,
-             initrd_filename, cpu_model, 0, 1);
+             initrd_filename, cpu_model, 0, 1, 0);
 }
 
 #ifdef CONFIG_XEN
@@ -312,8 +330,8 @@ static void pc_xen_hvm_init(ram_addr_t ram_size,
 }
 #endif
 
-static QEMUMachine pc_machine_v1_0 = {
-    .name = "pc-1.0",
+static QEMUMachine pc_machine_v1_1 = {
+    .name = "pc-1.1",
     .alias = "pc",
     .desc = "Standard PC",
     .init = pc_init_pci,
@@ -321,10 +339,17 @@ static QEMUMachine pc_machine_v1_0 = {
     .is_default = 1,
 };
 
+static QEMUMachine pc_machine_v1_0 = {
+    .name = "pc-1.0",
+    .desc = "Standard PC",
+    .init = pc_init_pci_oldcpu,
+    .max_cpus = 255,
+};
+
 static QEMUMachine pc_machine_v0_14 = {
     .name = "pc-0.14",
     .desc = "Standard PC",
-    .init = pc_init_pci,
+    .init = pc_init_pci_oldcpu,
     .max_cpus = 255,
     .compat_props = (GlobalProperty[]) {
         {
@@ -571,6 +596,7 @@ static QEMUMachine xenfv_machine = {
 
 static void pc_machine_init(void)
 {
+    qemu_register_machine(&pc_machine_v1_1);
     qemu_register_machine(&pc_machine_v1_0);
     qemu_register_machine(&pc_machine_v0_14);
     qemu_register_machine(&pc_machine_v0_13);
-- 
1.6.0.2