Re: [Qemu-devel] [PATCH] test for lm capable kernel.

[Anthony Liguori <anthony@codemonkey.ws>]

Glauber Costa wrote:
> Don't save x86_64-specific msrs if our kernel does not support them.
> Code is already in qemu-kvm.git, but the test function is slightly different.
> It follows what the test for msr_start does.
>   

Repeat after me: "I will not use --target-list when submitting qemu 
patches.  I will not use --target-list when submitting qemu patches."

Fedora enables ccache by default.  After one build, all future builds 
are extremely fast in most cases.  It's really not that bad :-)

> Signed-off-by: Glauber Costa <glommer@redhat.com>
> ---
>  target-i386/kvm.c |   37 +++++++++++++++++++++++++++----------
>  1 files changed, 27 insertions(+), 10 deletions(-)
>
> diff --git a/target-i386/kvm.c b/target-i386/kvm.c
> index 7010999..0e69b57 100644
> --- a/target-i386/kvm.c
> +++ b/target-i386/kvm.c
> @@ -15,6 +15,7 @@
>  #include <sys/types.h>
>  #include <sys/ioctl.h>
>  #include <sys/mman.h>
> +#include <sys/utsname.h>
>  
>  #include <linux/kvm.h>
>  
> @@ -266,6 +267,20 @@ static int kvm_has_msr_star(CPUState *env)
>      return 0;
>  }
>  
> +static int lm_capable_kernel(void)
> +{
> +    static int lm_capable = -1;
> +    struct utsname utsname;
> +
> +    if (lm_capable != -1) {
> +        return lm_capable;
> +    }
> +
> +    uname(&utsname);
> +    lm_capable = (strcmp(utsname.machine, "x86_64") == 0);
> +    return lm_capable;
> +}
> +
>   

This function is unused for qemu-system-i386.

Regards,

Anthony Liguori