On 02/04/16 15:01, Andy Lutomirski wrote:
> This adds paravirt hooks for unsafe MSR access. On native, they
> call native_{read,write}_msr. On Xen, they use
> xen_{read,write}_msr_safe.
>
> Nothing uses them yet for ease of bisection. The next patch will
> use them in rdmsrl, wrmsrl, etc.
>
> I intentionally didn't make them warn on #GP on Xen. I think that
> should be done separately by the Xen maintainers.
...
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>
> @@ -1092,6 +1092,26 @@ static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
> return ret;
> }
>
> +static u64 xen_read_msr(unsigned int msr)
> +{
> + /*
> + * This will silently swallow a #GP from RDMSR. It may be worth
> + * changing that.
This probably isn't important.
David
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