Re: [PATCH] xio3130_upstream: Add ACS (Access Control Services) capability

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Aug 14, 2022 at 03:47:49PM +0800, Paul Schlacter wrote:
> If it is a pcie device, check that all devices on the path from
> 
> the device to the root complex have ACS enabled, and then the
> 
> device will become an iommu_group.
> 
> it will have the effect of isolation
> 
> 
> Signed-off-by: wlfightup <wlfightup@gmail.com>

I don't think we can do this unconditionally. Has to have
a property and disabled for old versions.

> ---
> 
>  hw/pci-bridge/xio3130_upstream.c | 3 +++
> 
>  1 file changed, 3 insertions(+)
> 
> 
> diff --git a/hw/pci-bridge/xio3130_upstream.c b/hw/pci-bridge/
> xio3130_upstream.c
> 
> index 5ff46ef050..2df952222b 100644
> 
> --- a/hw/pci-bridge/xio3130_upstream.c
> 
> +++ b/hw/pci-bridge/xio3130_upstream.c
> 
> @@ -37,6 +37,8 @@
> 
>  #define XIO3130_SSVID_SSID              0
> 
>  #define XIO3130_EXP_OFFSET              0x90
> 
>  #define XIO3130_AER_OFFSET              0x100
> 
> +#define XIO3130_ACS_OFFSET \
> 
> +        (XIO3130_AER_OFFSET + PCI_ERR_SIZEOF)
> 
> 
>  static void xio3130_upstream_write_config(PCIDevice *d, uint32_t address,
> 
>                                            uint32_t val, int len)
> 
> @@ -92,6 +94,7 @@ static void xio3130_upstream_realize(PCIDevice *d, Error
> **errp)
> 
>          goto err;
> 
>      }
> 
> 
> +    pcie_acs_init(d, XIO3130_ACS_OFFSET);
> 
>      return;
> 
> 
>  err:
> 
> --
> 
> 2.24.3 (Apple Git-128)
>