[PATCH v1] vfio/igd: Update igd-assign.txt for Intel MTL and newer platforms

[PATCH v1] vfio/igd: Update igd-assign.txt for Intel MTL and newer platforms

[Yuan Wang]

Update the igd-assign.txt documentation to reflect the addition of
the 0006 patch in the ECI repository. This patch is required to
enable support for Meteor Lake (MTL) and subsequent Intel platforms.

Starting from MTL, the hardware-accessible BDSM (Base of Data Stolen
Memory) register in the PCI configuration space has been removed.
Instead, IGD devices now access stolen memory via MMIO BAR2 (LMEMBAR).
Consequently, guest firmware no longer needs to program the legacy
BDSM register.

Reviewed-by: Bosheng Xue <bosheng.xue@intel.com>
Signed-off-by: Yuan Wang <yuan1.wang@intel.com>
---
Note:

We added a patch to the ECI website to skip the DSM zero-size check as
the sixth patch. Accordingly, we updated igd-assign.txt to reflect this
change.

Link:
https://eci.intel.com/docs/3.3/components/kvm-hypervisor.html
---
 docs/igd-assign.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/igd-assign.txt b/docs/igd-assign.txt
index e54040335b..b9abfdbac3 100644
--- a/docs/igd-assign.txt
+++ b/docs/igd-assign.txt
@@ -263,6 +263,6 @@ Footnotes
 [2] # echo "vfio-pci" > /sys/bus/pci/devices/0000:00:02.0/driver_override
 [3] https://web.archive.org/web/20240827012422/https://bugzilla.tianocore.org/show_bug.cgi?id=935
     Tianocore bugzilla was down since Jan 2025 :(
-[4] https://eci.intel.com/docs/3.3/components/kvm-hypervisor.html, Patch 0001-0004
+[4] https://eci.intel.com/docs/3.3/components/kvm-hypervisor.html, Patch 0001-0004, 0006
 [5] https://github.com/tomitamoeko/VfioIgdPkg
 [6] https://winraid.level1techs.com/t/tool-guide-news-uefi-bios-updater-ubu/30357
-- 
2.34.1

Re: [PATCH v1] vfio/igd: Update igd-assign.txt for Intel MTL and newer platforms

[Cédric Le Goater]

On 9/28/26 10:42, Yuan Wang wrote:
> Update the igd-assign.txt documentation to reflect the addition of
> the 0006 patch in the ECI repository. This patch is required to
> enable support for Meteor Lake (MTL) and subsequent Intel platforms.
> 
> Starting from MTL, the hardware-accessible BDSM (Base of Data Stolen
> Memory) register in the PCI configuration space has been removed.
> Instead, IGD devices now access stolen memory via MMIO BAR2 (LMEMBAR).
> Consequently, guest firmware no longer needs to program the legacy
> BDSM register.
> 
> Reviewed-by: Bosheng Xue <bosheng.xue@intel.com>

I don't remember seeing this review on the list.

> Signed-off-by: Yuan Wang <yuan1.wang@intel.com>
> ---
> Note:
> 
> We added a patch to the ECI website to skip the DSM zero-size check as
> the sixth patch. Accordingly, we updated igd-assign.txt to reflect this
> change.
> 
> Link:
> https://eci.intel.com/docs/3.3/components/kvm-hypervisor.html
> ---
>   docs/igd-assign.txt | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/docs/igd-assign.txt b/docs/igd-assign.txt
> index e54040335b..b9abfdbac3 100644
> --- a/docs/igd-assign.txt
> +++ b/docs/igd-assign.txt
> @@ -263,6 +263,6 @@ Footnotes
>   [2] # echo "vfio-pci" > /sys/bus/pci/devices/0000:00:02.0/driver_override
>   [3] https://web.archive.org/web/20240827012422/https://bugzilla.tianocore.org/show_bug.cgi?id=935
>       Tianocore bugzilla was down since Jan 2025 :(
> -[4] https://eci.intel.com/docs/3.3/components/kvm-hypervisor.html, Patch 0001-0004
> +[4] https://eci.intel.com/docs/3.3/components/kvm-hypervisor.html, Patch 0001-0004, 0006
>   [5] https://github.com/tomitamoeko/VfioIgdPkg
>   [6] https://winraid.level1techs.com/t/tool-guide-news-uefi-bios-updater-ubu/30357


Applied to

     https://github.com/legoater/qemu vfio-next

Thanks,

C.