[Qemu-devel] [PATCH] Use kvm32/kvm64 as default CPUs when running under KVM.

[Qemu-devel] [PATCH] Use kvm32/kvm64 as default CPUs when running under KVM.

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

KVM has a minimum CPU requirement in order to run, so there is no
reason to default to the very basic family 6, model 2 (or model 3 for
qemu32) CPU since the additional features are going to be available on
the host CPU.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 hw/pc.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index 58dea57..b17a199 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -39,6 +39,7 @@
 #include "msix.h"
 #include "sysbus.h"
 #include "sysemu.h"
+#include "kvm.h"
 
 /* output Bochs bios info messages */
 //#define DEBUG_BIOS
@@ -866,11 +867,19 @@ void pc_cpus_init(const char *cpu_model)
 
     /* init CPUs */
     if (cpu_model == NULL) {
+        if (kvm_enabled()) {
 #ifdef TARGET_X86_64
-        cpu_model = "qemu64";
+            cpu_model = "kvm64";
 #else
-        cpu_model = "qemu32";
+            cpu_model = "kvm32";
 #endif
+        } else {
+#ifdef TARGET_X86_64
+            cpu_model = "qemu64";
+#else
+            cpu_model = "qemu32";
+#endif
+        }
     }
 
     for(i = 0; i < smp_cpus; i++) {
-- 
1.7.1.1

Re: [Qemu-devel] [PATCH] Use kvm32/kvm64 as default CPUs when running under KVM.

[Avi Kivity]

  On 07/28/2010 01:05 PM, Jes.Sorensen@redhat.com wrote:
> From: Jes Sorensen<Jes.Sorensen@redhat.com>
>
> KVM has a minimum CPU requirement in order to run, so there is no
> reason to default to the very basic family 6, model 2 (or model 3 for
> qemu32) CPU since the additional features are going to be available on
> the host CPU.
>
>
> @@ -866,11 +867,19 @@ void pc_cpus_init(const char *cpu_model)
>
>       /* init CPUs */
>       if (cpu_model == NULL) {
> +        if (kvm_enabled()) {
>   #ifdef TARGET_X86_64
> -        cpu_model = "qemu64";
> +            cpu_model = "kvm64";
>   #else
> -        cpu_model = "qemu32";
> +            cpu_model = "kvm32";
>   #endif
> +        } else {
> +#ifdef TARGET_X86_64
> +            cpu_model = "qemu64";
> +#else
> +            cpu_model = "qemu32";
> +#endif
> +        }
>       }

What about -M 0.12?  It needs to retain the old values.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

Re: [Qemu-devel] [PATCH] Use kvm32/kvm64 as default CPUs when running under KVM.

[Jes Sorensen]

On 07/28/10 12:51, Avi Kivity wrote:
>  On 07/28/2010 01:05 PM, Jes.Sorensen@redhat.com wrote:
>> From: Jes Sorensen<Jes.Sorensen@redhat.com>
>>
>> KVM has a minimum CPU requirement in order to run, so there is no
>> reason to default to the very basic family 6, model 2 (or model 3 for
>> qemu32) CPU since the additional features are going to be available on
>> the host CPU.
>>
>>
>> @@ -866,11 +867,19 @@ void pc_cpus_init(const char *cpu_model)
>>
>>       /* init CPUs */
>>       if (cpu_model == NULL) {
>> +        if (kvm_enabled()) {
>>   #ifdef TARGET_X86_64
>> -        cpu_model = "qemu64";
>> +            cpu_model = "kvm64";
>>   #else
>> -        cpu_model = "qemu32";
>> +            cpu_model = "kvm32";
>>   #endif
>> +        } else {
>> +#ifdef TARGET_X86_64
>> +            cpu_model = "qemu64";
>> +#else
>> +            cpu_model = "qemu32";
>> +#endif
>> +        }
>>       }
> 
> What about -M 0.12?  It needs to retain the old values.
> 

Urgh, good point. I'll come up with a fix for that. So much for a simple
patch :)

Jes