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[Qemu-devel] [PATCH v3] xen_pt: fix failure of attaching & detaching a P
From: |
Jianzhong,Chang |
Subject: |
[Qemu-devel] [PATCH v3] xen_pt: fix failure of attaching & detaching a PCI device to VM repeatedly. |
Date: |
Wed, 9 Mar 2016 18:24:35 +0800 |
Add pci = [ '$VF_BDF1', '$VF_BDF2', '$VF_BDF3'] in hvm guest configuration
file.
After the guest boot up, detach the VFs in sequence by
"xl pci-detach $DOMID $VF_BDF1"
"xl pci-detach $DOMID $VF_BDF2"
"xl pci-detach $DOMID $VF_BDF3"
and reattach the VFs in sequence by
"xl pci-attach $DOMID $VF_BDF1"
"xl pci-attach $DOMID $VF_BDF2"
"xl pci-attach $DOMID $VF_BDF3"
An error message will be reported like this:
"libxl: error: libxl_qmp.c:287:qmp_handle_error_response:
received an error message from QMP server:
Duplicate ID 'pci-pt-07_10.1' for device"
When xen_pt_region_add/del() is called,
MemoryRegion may not belong to the XenPCIPassthroughState.
xen_pt_region_update() checks it but memory_region_ref/unref() does not.
This case causes obj->ref issue and affects the release of related objects.
So, memory_region_ref/unref() is moved f
rom xen_pt_region_add/del to xen_pt_region_update.
Signed-off-by: Jianzhong,Chang <address@hidden>
---
hw/xen/xen_pt.c | 16 +++++++++++-----
1 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index aa96288..6b72ede 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -591,12 +591,16 @@ static void xen_pt_region_update(XenPCIPassthroughState
*s,
return;
}
+ if (adding) {
+ memory_region_ref(sec->mr);
+ }
+
if (s->msix && &s->msix->mmio == mr) {
if (adding) {
s->msix->mmio_base_addr = sec->offset_within_address_space;
rc = xen_pt_msix_update_remap(s, s->msix->bar_index);
}
- return;
+ goto out;
}
args.type = d->io_regions[bar].type;
@@ -635,6 +639,12 @@ static void xen_pt_region_update(XenPCIPassthroughState *s,
adding ? "create new" : "remove old", errno);
}
}
+
+out:
+ if (!adding) {
+ memory_region_unref(mr);
+ }
+
}
static void xen_pt_region_add(MemoryListener *l, MemoryRegionSection *sec)
@@ -642,7 +652,6 @@ static void xen_pt_region_add(MemoryListener *l,
MemoryRegionSection *sec)
XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
memory_listener);
- memory_region_ref(sec->mr);
xen_pt_region_update(s, sec, true);
}
@@ -652,7 +661,6 @@ static void xen_pt_region_del(MemoryListener *l,
MemoryRegionSection *sec)
memory_listener);
xen_pt_region_update(s, sec, false);
- memory_region_unref(sec->mr);
}
static void xen_pt_io_region_add(MemoryListener *l, MemoryRegionSection *sec)
@@ -660,7 +668,6 @@ static void xen_pt_io_region_add(MemoryListener *l,
MemoryRegionSection *sec)
XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
io_listener);
- memory_region_ref(sec->mr);
xen_pt_region_update(s, sec, true);
}
@@ -670,7 +677,6 @@ static void xen_pt_io_region_del(MemoryListener *l,
MemoryRegionSection *sec)
io_listener);
xen_pt_region_update(s, sec, false);
- memory_region_unref(sec->mr);
}
static const MemoryListener xen_pt_memory_listener = {
--
1.7.1
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