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SubjectRe: [PATCH v12 07/18] xen/pvh: Setup up shared_info.
On 03/01/14 14:39, Konrad Rzeszutek Wilk wrote:
> On Thu, Jan 02, 2014 at 11:27:56AM +0000, David Vrabel wrote:
>> On 01/01/14 04:35, Konrad Rzeszutek Wilk wrote:
>>> From: Mukesh Rathor <mukesh.rathor@oracle.com>
>>>
>>> For PVHVM the shared_info structure is provided via the same way
>>> as for normal PV guests (see include/xen/interface/xen.h).
>>>
>>> That is during bootup we get 'xen_start_info' via the %esi register
>>> in startup_xen. Then later we extract the 'shared_info' from said
>>> structure (in xen_setup_shared_info) and start using it.
>>>
>>> The 'xen_setup_shared_info' is all setup to work with auto-xlat
>>> guests, but there are two functions which it calls that are not:
>>> xen_setup_mfn_list_list and xen_setup_vcpu_info_placement.
>>> This patch modifies those to work in auto-xlat mode.
>> [...]
>>> --- a/arch/x86/xen/enlighten.c
>>> +++ b/arch/x86/xen/enlighten.c
>>> @@ -1147,8 +1147,9 @@ void xen_setup_vcpu_info_placement(void)
>>> xen_vcpu_setup(cpu);
>>>
>>> /* xen_vcpu_setup managed to place the vcpu_info within the
>>> - percpu area for all cpus, so make use of it */
>>> - if (have_vcpu_info_placement) {
>>> + * percpu area for all cpus, so make use of it. Note that for
>>> + * PVH we want to use native IRQ mechanism. */
>>> + if (have_vcpu_info_placement && !xen_pvh_domain()) {
>>> pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
>>> pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
>>> pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
>>
>> Should this be in a separate patch: "xen/pvh: use native irq ops"?
>
> On a second thought I think not. The reason is explained in the commit
> description:
>
> The 'xen_setup_shared_info' is all setup to work with auto-xlat
> guests, but there are two functions which it calls that are not:
> xen_setup_mfn_list_list and xen_setup_vcpu_info_placement.
> This patch modifies those to work in auto-xlat mode.
>
> If we move this to another patch, it is going to be mostly the same
> comment and this patch will feel unfinished.

Looking at again, this hunk be in "xen/pvh: Piggyback on PVHVM for event
channel" where we have:

+ if (!xen_feature(XENFEAT_hvm_callback_vector))
+ pv_irq_ops = xen_irq_ops;

The tests in both places need to be the same as well.

David


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