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Re: [Xen-devel] [PATCH 3/6] x86/vtd: Drop struct qi_ctrl
- To: Jan Beulich <JBeulich@xxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 25 Feb 2019 11:07:02 +0000
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- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- Delivery-date: Mon, 25 Feb 2019 11:08:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 25/02/2019 10:59, Jan Beulich wrote:
>>>> On 25.02.19 at 11:02, <Paul.Durrant@xxxxxxxxxx> wrote:
>>> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
>>> Sent: 22 February 2019 19:13
>>>
>>> --- a/xen/drivers/passthrough/vtd/qinval.c
>>> +++ b/xen/drivers/passthrough/vtd/qinval.c
>>> @@ -84,7 +84,7 @@ static int __must_check
>>> queue_invalidate_context_sync(struct vtd_iommu *iommu,
>>>
>>> spin_lock_irqsave(&iommu->register_lock, flags);
>>> index = qinval_next_index(iommu);
>>> - entry_base = iommu_qi_ctrl(iommu)->qinval_maddr +
>>> + entry_base = iommu->qinval_maddr +
>>> ((index >> QINVAL_ENTRY_ORDER) << PAGE_SHIFT);
>> ^ This calculation looks worthy of a macro or an inline. It is repeated a
>> lot.
> And indeed the other day I was surprised that there is
> GET_IREMAP_ENTRY(), but no qinval equivalent.
I won't be making any changes like that to this patch. There is an
orthogonal piece of work to vmap these structures and replace all of
this logic with a straight array lookup by index. Unfortunately we
don't have memremap() in Xen yet and I don't have time right now to sort
that.
GET_IREMAP_ENTRY() is a particularly bad example of a helper, as results
in several necessary pieces of calculation in certain cases, and hides a
use of map_domain_page() which results in the logic which uses it
looking asymmetric.
~Andrew
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