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xen-devel
RE: [Xen-devel] [PATCH 0/5] Add MSI support to XEN
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To: |
"Neil Turton" <nturton@xxxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] [PATCH 0/5] Add MSI support to XEN |
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From: |
"Shan, Haitao" <haitao.shan@xxxxxxxxx> |
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Date: |
Thu, 3 Apr 2008 20:11:55 +0800 |
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Cc: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Li, Xin B" <xin.b.li@xxxxxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> |
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Thu, 03 Apr 2008 05:20:56 -0700 |
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[Xen-devel] [PATCH 0/5] Add MSI support to XEN |
Hi, Neil
Thanks for trying the patches. The problem is caused by incompatibility between
Xen and Dom0 kernel.
Pci_vector_resources is to calculate available vectors. Xen assigns vector by
start with vector 0x20 and offset = 0. This will confuse the code in
pci_vector_resources.
Maybe we should replace the function with a hypercall to acquire the number of
available vectors.
How do you think about it, Keir?
Thanks!
Shan Haitao
-----Original Message-----
From: Neil Turton [mailto:nturton@xxxxxxxxxxxxxx]
Sent: 2008年4月2日 22:56
To: Shan, Haitao
Cc: Keir Fraser; xen-devel; Tian, Kevin; Jiang, Yunhong; Li, Xin B
Subject: Re: [Xen-devel] [PATCH 0/5] Add MSI support to XEN
I tried this patch and MSI seems to work fine with a driver in DOM0. It
didn't work with MSI-X though because pci_vector_resources returned 8
and I have 10 MSI capable devices in the machine. I've only got 6
Phys-irq interrupts listed in /proc/interrupts so I'd expect there to be
more vectors free. I applied the debugging patch below and got the
following output.
diff -r 9bb373519b68 arch/i386/pci/irq-xen.c
--- a/arch/i386/pci/irq-xen.c Tue Apr 01 14:15:23 2008 +0100
+++ b/arch/i386/pci/irq-xen.c Wed Apr 02 13:19:05 2008 +0100
@@ -1192,6 +1192,7 @@ int pci_vector_resources(int last, int n
int offset = (last % 8);
while (next < FIRST_SYSTEM_VECTOR) {
+ printk("next=%d count=%d\n", next, count);
next += 8;
#ifdef CONFIG_X86_64
if (next == IA32_SYSCALL_VECTOR)
[pci_vector_resources(176, 1) called]
next=176 count=1
next=184 count=2
next=192 count=3
next=200 count=4
next=208 count=5
next=216 count=6
next=224 count=7
next=232 count=8
[pci_vector_resources returned 8]
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