Re: [PATCH v3 1/2][4.15] VMX: delay p2m insertion of APIC access page

[Jan Beulich <jbeulich@suse.com>]

On 22.02.2021 11:56, Jan Beulich wrote:
> --- a/xen/arch/x86/hvm/vmx/vmx.c
> +++ b/xen/arch/x86/hvm/vmx/vmx.c
> @@ -428,6 +428,14 @@ static void vmx_domain_relinquish_resour
>      vmx_free_vlapic_mapping(d);
>  }
>  
> +static void domain_creation_finished(struct domain *d)
> +{
> +    if ( has_vlapic(d) && !mfn_eq(d->arch.hvm.vmx.apic_access_mfn, _mfn(0)) &&
> +         set_mmio_p2m_entry(d, gaddr_to_gfn(APIC_DEFAULT_PHYS_BASE),
> +                            d->arch.hvm.vmx.apic_access_mfn, PAGE_ORDER_4K) )
> +        domain_crash(d);
> +}

Having noticed that in patch 2 I also need to arrange for
ept_get_entry_emt() to continue to return WB for this page, I'm
inclined to add a respective assertion here. Would anyone object
to me doing so?

Kevin, Jun - I'd like this to also serve as a ping for an ack
(with or without the suggested ASSERT() addition).

Jan