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xen-devel
Re: [Xen-devel] [PATCH 0/3] x2APIC improvement
Konrad Rzeszutek Wilk wrote:
On Wed, Jul 07, 2010 at 01:09:08PM +0800, Weidong Han wrote:
Konrad Rzeszutek Wilk wrote:
On Mon, Jul 05, 2010 at 03:07:58PM +0800, Han, Weidong wrote:
The patchset improves Xen x2APIC support.
Patch 1/3: allocate iommu when create a drhd
A drhd is created when parse ACPI DMAR table, but drhd->iommu is not
allocated until iommu setup. But iommu is needed by x2APIC which will enable interrupt
remapping before iommu setup. This patch allocates iommu when create drhd. And then
drhd->ecap can be removed because it's the same as iommu->ecap.
Have these patches been tested on a machine where the number of DRHD !=
number of IOAPICs?
Why need to care about number of DRHD != number of IOAPICs? One DRHD
may cover more than one IOAPICs. And there is already check if all
And the inverse might be true as well - in which case we should disable
x2APIC.
Each IOAPIC must have a corresponding DRHD, but a DRHD maybe don't have
a IOAPIC in its device scope. So it won't enable x2APIC if there is any
IOAPIC which doesn't have corresponding DRHD.
IOAPICs have corresponding DRHD.
I understand. I am asking whether these patches have not changed that
behavior and whether you have tested for that.
These patches don't change that behavior.
Regards,
Weidong
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