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Re: [Qemu-devel] [PATCH v4] xen-hvm: stop faking I/O to access PCI confi


From: Anthony PERARD
Subject: Re: [Qemu-devel] [PATCH v4] xen-hvm: stop faking I/O to access PCI config space
Date: Fri, 18 May 2018 16:31:40 +0100
User-agent: Mutt/1.9.5 (2018-04-13)

On Fri, May 18, 2018 at 03:38:30PM +0100, Paul Durrant wrote:
> This patch removes the current hackery where IOREQ_TYPE_PCI_CONFIG
> requests are handled by faking PIO to 0xcf8 and 0xcfc and replaces it
> with direct calls to pci_host_config_read/write_common().
> Doing so necessitates mapping BDFs to PCIDevices but maintaining a simple
> QLIST in xen_device_realize/unrealize() will suffice.
> 
> NOTE: whilst config space accesses are currently limited to
>       PCI_CONFIG_SPACE_SIZE, this patch paves the way to increasing the
>       limit to PCIE_CONFIG_SPACE_SIZE when Xen gains the ability to
>       emulate MCFG table accesses.
> 
> Signed-off-by: Paul Durrant <address@hidden>

Reviewed-by: Anthony PERARD <address@hidden>

-- 
Anthony PERARD



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