[Xen-devel] [PATCH] ioreq-server: handle IOREQ_TYPE_PCI_CONFIG in assist function

[Wei Liu <wei.liu2@xxxxxxxxxx>]

QEMU stubdom will read PCI config space when enumerating PCI devices.
Xen should return ~0 when there is no suitable ioreq server to dispatch
the request.

Without this patch, QEMU stubdom will fail to start because hvmloader
fails following assertion:

118         ASSERT((devfn != PCI_ISA_DEVFN) ||
119                ((vendor_id == 0x8086) && (device_id == 0x7000)));

because vendor_id and device_id are 0.

This fixes a regression for QEMU stubdom. It should be backported to 4.5
as well.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Paul Durrant <paul.durrant@xxxxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index c7984d1..c826ac5 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -2577,6 +2577,7 @@ static bool_t hvm_complete_assist_req(ioreq_t *p)
     {
     case IOREQ_TYPE_COPY:
     case IOREQ_TYPE_PIO:
+    case IOREQ_TYPE_PCI_CONFIG:
         if ( p->dir == IOREQ_READ )
         {
             if ( !p->data_is_ptr )
-- 
1.9.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel