Re: [Xen-devel] [PATCHv2 for-4.6] p2m/ept: Work around hardware errata setting A bit

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 28.09.15 at 14:39, <ross.lagerwall@xxxxxxxxxx> wrote:
> --- a/xen/arch/x86/mm/p2m-ept.c
> +++ b/xen/arch/x86/mm/p2m-ept.c
> @@ -34,6 +34,8 @@
>  
>  #include "mm-locks.h"
>  
> +static bool_t __read_mostly cpu_has_ept_ad;

This should be
#define cpu_has_ept_ad (vmx_ept_vpid_cap & VMX_EPT_AD_BIT)
put next to the respective other ones in vmx.h.

> @@ -1150,6 +1152,9 @@ int ept_p2m_init(struct p2m_domain *p2m)
>      p2m->memory_type_changed = ept_memory_type_changed;
>      p2m->audit_p2m = NULL;
>  
> +    /* Work around Errata AVR41 on Avaton processors. */
> +    cpu_has_ept_ad = boot_cpu_data.x86_model != 0x4d;

And this one then should turn off said flag (i.e. needs to be moved
elsewhere).

Plus PML initialization should get a respective check added.

Jan


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