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Re: [PATCH] VT-d: avoid multi-message-MSI check for HPET
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 10 Apr 2026 07:51:45 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Fri, 10 Apr 2026 05:52:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 09.04.2026 19:36, Roger Pau Monné wrote:
> On Wed, Apr 01, 2026 at 02:47:48PM +0200, Jan Beulich wrote:
>> Having this immediately below a PCI-dev vs HPET conditional is (mildly)
>> confusing. Move that if() into the body of the earlier one.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>
>> --- a/xen/drivers/passthrough/vtd/intremap.c
>> +++ b/xen/drivers/passthrough/vtd/intremap.c
>> @@ -513,13 +513,13 @@ static int msi_msg_to_remap_entry(
>>
>> if ( rc )
>> return rc;
>> +
>> + if ( msi_desc->msi_attrib.type == PCI_CAP_ID_MSI )
>> + nr = msi_desc->msi.nvec;
>> }
>> else
>> set_hpet_source_id(msi_desc->hpet_id, &new_ire);
>>
>> - if ( msi_desc->msi_attrib.type == PCI_CAP_ID_MSI )
>> - nr = msi_desc->msi.nvec;
>> -
>
> I'm not fully opposed to this, but maybe it would be good to add a
> small comment to note that HPET never use multi-vector MSI?
That aspect doesn't change - HPET code simply doesn't (and never should)
set .type to PCI_CAP_ID_MSI. That field should reflect reality (and HPET,
iirc, simply leaves it at 0).
Jan
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