> -Original Message-
> From: Chen, Tiejun
> Sent: Tuesday, January 20, 2015 7:17 PM
> To: Michael S. Tsirkin; Kay, Allen M
> Cc: pbonz...@redhat.com; aligu...@amazon.com; r...@twiddle.net; Zhang,
> Yang Z; qemu-devel@nongnu.org
> Subject: Re: [v6][PATCH 08/10] xen, gfx passthrough: suppor
+uint32_t xen_igd_pci_read(PCIDevice *pci_dev, uint32_t config_addr, int len)
+{
+XenHostPCIDevice dev;
+uint32_t val;
+int r;
+
+/* IGD read/write is through the host bridge.
+ */
+assert(pci_dev->devfn == 0x00);
+
+if (!is_igd_passthrough(pci_dev)) {
+goto rea
On Mon, Jan 19, 2015 at 05:28:41PM +0800, Tiejun Chen wrote:
> Some registers of Intel IGD are mapped in host bridge, so it needs to
> passthrough these registers of physical host bridge to guest because
> emulated host bridge in guest doesn't have these mappings.
>
> Signed-off-by: Tiejun Chen
>
Some registers of Intel IGD are mapped in host bridge, so it needs to
passthrough these registers of physical host bridge to guest because
emulated host bridge in guest doesn't have these mappings.
Signed-off-by: Tiejun Chen
Signed-off-by: Yang Zhang
---
hw/pci-host/piix.c | 3 ++
hw/xen
