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[Qemu-devel] migrating guest with msi-x interrupts
From: |
Cam Macdonell |
Subject: |
[Qemu-devel] migrating guest with msi-x interrupts |
Date: |
Tue, 25 May 2010 16:09:13 -0600 |
Hi,
I'm trying to migrate a guest device with MSI-X interrupts. However,
the interrupts are not injected into the guest. I've added some
tracing to msix.c and it seems that the MSI-X vectors are masked when
the guest is resumed (I'm testing with static migration).
In particular, in msix.c, msix_is_masked(...) is returning true when
the guest resumes which causes msix_set_pending() to be called instead
of msix_set_irq().
/* Send an MSI-X message */
void msix_notify(PCIDevice *dev, unsigned vector)
{
uint8_t *table_entry = dev->msix_table_page + vector * MSIX_ENTRY_SIZE;
uint64_t address;
uint32_t data;
if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector])
return;
if (msix_is_masked(dev, vector)) {
msix_set_pending(dev, vector);
return;
}
...
Does migrating a guest device that uses MSI-X require
msix_load()/save() to be called explicity in a pre/post_save/load
function?
Any pointers or comments would be helpful,
Cam
- [Qemu-devel] migrating guest with msi-x interrupts,
Cam Macdonell <=