>>> On 25.06.15 at 14:02, <li...@eikelenboom.it> wrote:
> Thursday, June 25, 2015, 1:29:39 PM, you wrote:
>>>>> On 25.06.15 at 12:51, <li...@eikelenboom.it> wrote:
>>> Attached is the xl-dmesg output of:
>>>
>>> - debug-keys M and i before guest boot
>>> - guest boot
>>> - debug-keys M and i after lsusb in the guest that hangs.
>
>> Interesting:
>
>> (XEN) [2015-06-25 10:46:31.820] MSI-X 84 vec=aa lowest edge assert
>> log
> lowest dest=00000002 mask=1/ G/1
>> (XEN) [2015-06-25 10:46:31.820] MSI-X 85 vec=b2 lowest edge assert
>> log
> lowest dest=00000002 mask=1/ G/1
>> (XEN) [2015-06-25 10:46:31.820] MSI-X 86 vec=ba lowest edge assert
>> log
> lowest dest=00000002 mask=1/ G/1
>> (XEN) [2015-06-25 10:46:31.820] MSI-X 87 vec=c2 lowest edge assert
>> log
> lowest dest=00000002 mask=1/ G/1
>> (XEN) [2015-06-25 10:46:31.820] MSI-X 88 vec=ca lowest edge assert
>> log
> lowest dest=00000002 mask=1/ G/1
>
>> I.e. they didn't get unmasked by the guest.
Attached a first debugging patch.
Jan
--- unstable.orig/xen/arch/x86/hvm/vmsi.c 2015-06-22 11:50:41.000000000
+0200
+++ unstable/xen/arch/x86/hvm/vmsi.c 2015-06-26 11:50:44.000000000 +0200
@@ -267,18 +267,30 @@ static int msixtbl_write(struct vcpu *v,
int r = X86EMUL_UNHANDLEABLE;
unsigned long flags;
struct irq_desc *desc;
+unsigned int seg, bus, slot, func;//temp
if ( (len != 4 && len != 8) || (address & (len - 1)) )
+{//temp
+ printk("MSI-X bad write (%lx,%lu)\n", address, len);//temp
return r;
+}
rcu_read_lock(&msixtbl_rcu_lock);
entry = msixtbl_find_entry(v, address);
if ( !entry )
+{//temp
+ printk("MSI-X not found (%lx,%lu)\n", address, len);//temp
goto out;
+}
nr_entry = (address - entry->gtable) / PCI_MSIX_ENTRY_SIZE;
offset = address & (PCI_MSIX_ENTRY_SIZE - 1);
+seg = entry->pdev->seg;
+bus = entry->pdev->bus;
+slot = PCI_SLOT(entry->pdev->devfn);
+func = PCI_FUNC(entry->pdev->devfn);
+printk("MSI-X write %04x:%02x:%02x.%u#%03x:%lx:%lu\n", seg, bus, slot, func,
nr_entry, offset, len);//temp
if ( offset != PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET )
{
index = offset / sizeof(uint32_t);
@@ -302,25 +314,37 @@ static int msixtbl_write(struct vcpu *v,
if ( !(val & PCI_MSIX_VECTOR_BITMASK) &&
test_and_clear_bit(nr_entry, &entry->table_flags) )
{
+printk("MSI-X defer %04x:%02x:%02x.%u#%03x:%lx:%lu\n", seg, bus, slot, func,
nr_entry, offset, len);//temp
v->arch.hvm_vcpu.hvm_io.msix_unmask_address = address;
goto out;
}
msi_desc = msixtbl_addr_to_desc(entry, address);
if ( !msi_desc || msi_desc->irq < 0 )
+{//temp
+ printk("MSI-X %04x:%02x:%02x.%u#%03x no IRQ (%d)\n", seg, bus, slot, func,
nr_entry, msi_desc ? msi_desc->irq : INT_MIN);//temp
goto out;
+}
+ASSERT(entry->pdev == msi_desc->dev);//temp
desc = irq_to_desc(msi_desc->irq);
if ( !desc )
+{//temp
+ printk("MSI-X %04x:%02x:%02x.%u#%03x no IRQ%d desc\n", seg, bus, slot, func,
nr_entry, msi_desc->irq);//temp
goto out;
+}
spin_lock_irqsave(&desc->lock, flags);
if ( !desc->msi_desc )
+{//temp
+ printk("MSI-X %04x:%02x:%02x.%u#%03x no IRQ%d MSI desc\n", seg, bus, slot,
func, nr_entry, msi_desc->irq);//temp
goto unlock;
+}
ASSERT(msi_desc == desc->msi_desc);
+printk("MSI-X %04x:%02x:%02x.%u#%03x IRQ%d mask=%d\n", seg, bus, slot, func,
nr_entry, msi_desc->irq, !!(val & PCI_MSIX_VECTOR_BITMASK));//temp
guest_mask_msi_irq(desc, !!(val & PCI_MSIX_VECTOR_BITMASK));
unlock:
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