On Wed, May 16, 2018 at 12:08:02PM +0100, Andrew Cooper wrote:
> On 14/05/18 16:52, Jan Beulich wrote:
> On 14.05.18 at 17:39, wrote:
> >> On Fri, May 11, 2018 at 11:38:11AM +0100, Andrew Cooper wrote:
> >>> @@ -417,6 +419,32 @@ void __init init_speculation_mitigations(void)
> >>> se
On 14/05/18 16:52, Jan Beulich wrote:
On 14.05.18 at 17:39, wrote:
>> On Fri, May 11, 2018 at 11:38:11AM +0100, Andrew Cooper wrote:
>>> @@ -417,6 +419,32 @@ void __init init_speculation_mitigations(void)
>>> setup_clear_cpu_cap(X86_FEATURE_NO_XPTI);
>>>
>>> print_details(thun
>>> On 14.05.18 at 17:39, wrote:
> On Fri, May 11, 2018 at 11:38:11AM +0100, Andrew Cooper wrote:
>> @@ -417,6 +419,32 @@ void __init init_speculation_mitigations(void)
>> setup_clear_cpu_cap(X86_FEATURE_NO_XPTI);
>>
>> print_details(thunk, caps);
>> +
>> +/*
>> + * If MSR_
On Fri, May 11, 2018 at 11:38:11AM +0100, Andrew Cooper wrote:
> @@ -417,6 +419,32 @@ void __init init_speculation_mitigations(void)
> setup_clear_cpu_cap(X86_FEATURE_NO_XPTI);
>
> print_details(thunk, caps);
> +
> +/*
> + * If MSR_SPEC_CTRL is available, apply Xen's default
With the impending ability to disable MSR_SPEC_CTRL handling on a
per-guest-type basis, the first exit-from-guest may not have the side effect
of loading Xen's choice of value. Explicitly set Xen's default during the BSP
and AP boot paths.
For the BSP however, delay setting a non-zero MSR_SPEC_CT
