[Xen-devel] [PATCH V2] qemu-xen: vt-d bugfix for pci rom

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

Liu, Jinsong wrote:
> From 7d93370e8005499d18507b8cd9fa71f4ae794e19 Mon Sep 17 00:00:00 2001
> From: Liu Jinsong <jinsong.liu@xxxxxxxxxxxxxxx>
> Date: Fri, 6 Sep 2013 16:34:56 +0800
> Subject: [PATCH] qemu-xen: vt-d bugfix for pci rom
> 

Sorry, update 'From: Liu Jinsong <jinsong.liu@xxxxxxxxxxxxxxx>' and add some 
error log.

===========
From 7d93370e8005499d18507b8cd9fa71f4ae794e19 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@xxxxxxxxx>
Date: Fri, 6 Sep 2013 16:34:56 +0800
Subject: [PATCH V2] qemu-xen: vt-d bugfix for pci rom

Remove incorrect memory_region_init_rom_device() from xen_pt_register_regions(),
otherwise vt-d device with pci rom cannot pass through to hvm, since it trys to
populate from normal ram for pci rom. For example, when we pass through Intel 
82576
NIC (with 4MB pci rom) to hvm guest, it fails with

libxl: error: libxl_qmp.c:454:qmp_next: Socket read error: Connection reset by 
peer
qemu: hardware error: xen: xen_domid = 3, nr_pfn = 400, ram_addr = 20010000
(XEN) page_alloc.c:1460:d0 Over-allocation for domain 3: 131329 > 131328
(XEN) memory.c:132:d0 Could not allocate order=0 extent: id=3 memflags=0 (254 
of 1024)

Signed-off-by: Liu Jinsong <jinsong.liu@xxxxxxxxx>
---
 hw/xen_pt.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/hw/xen_pt.c b/hw/xen_pt.c
index 7aae826..b0bffdb 100644
--- a/hw/xen_pt.c
+++ b/hw/xen_pt.c
@@ -440,8 +440,6 @@ static int xen_pt_register_regions(XenPCIPassthroughState 
*s)
 
         s->bases[PCI_ROM_SLOT].access.maddr = d->rom.base_addr;
 
-        memory_region_init_rom_device(&s->rom, NULL, NULL,
-                                      "xen-pci-pt-rom", d->rom.size);
         pci_register_bar(&s->dev, PCI_ROM_SLOT, PCI_BASE_ADDRESS_MEM_PREFETCH,
                          &s->rom);
 
-- 
1.7.1

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