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 from xen_pt_region_add/del to xen_pt_region_update. Signed-off-by: Jianzhong,Chang <jianzhongx.ch...@intel.com> --- hw/xen/xen_pt.c | 13 ++++++++----- 1 files changed, 8 insertions(+), 5 deletions(-) diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c index aa96288..b963208 100644 --- a/hw/xen/xen_pt.c +++ b/hw/xen/xen_pt.c @@ -590,11 +590,15 @@ static void xen_pt_region_update(XenPCIPassthroughState *s, if (bar == -1 && (!s->msix || &s->msix->mmio != mr)) { return; } - + if (adding) { + memory_region_ref(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); + } else { + memory_region_unref(mr); } return; } @@ -635,6 +639,9 @@ static void xen_pt_region_update(XenPCIPassthroughState *s, adding ? "create new" : "remove old", errno); } } + if (!adding) { + memory_region_unref(mr); + } } static void xen_pt_region_add(MemoryListener *l, MemoryRegionSection *sec) @@ -642,7 +649,6 @@ 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 +658,6 @@ 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 +665,6 @@ 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 +674,6 @@ 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