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

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

Ping?

Thanks,
Jinsong

Liu, Jinsong wrote:
> 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);


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