Re: [Xen-devel] [PATCH v3.1 01/15] xen/x86: remove XENFEAT_hvm_pirqs for PVHv2 guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.11.16 at 13:35, <roger.pau@xxxxxxxxxx> wrote:
> --- a/docs/misc/hvmlite.markdown
> +++ b/docs/misc/hvmlite.markdown
> @@ -75,3 +75,38 @@ info structure that's passed at boot time (field 
> rsdp_paddr).
>  
>  Description of paravirtualized devices will come from XenStore, just as it's
>  done for HVM guests.
> +
> +## Interrupts ##
> +
> +### Interrupts from physical devices ###
> +
> +Interrupts from physical devices are delivered using native methods, this is
> +done in order to take advantage of new hardware assisted virtualization
> +functions, like posted interrupts.

Okay, that's a reason for this to be optional (iirc AMD doesn't
have posted interrupts so far), not for all the physdev ops being
made not work at all. The more that I think I did point out before
that there is at least one case where interrupt delivery info
needs to be made available to Xen despite Dom0 not setting up
an IO-APIC entry, and hence a physdev op is the only way to
communicate that information.

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel