Re: [Qemu-devel] [RFC 0/6] Refine IGD stolen memory support in VFIO

[Zhi Wang]

Hi Alex:
    This the RFC patch of my ides in previous email. Could you shed 
some lights here? :)

Thanks,
Zhi.

On 05/30/17 01:30, Zhi Wang wrote:
> This patch series are aim to refine the IGD stolen memory support in QEMU.
>
> Some features of Intel HW relies on the stolen memory to work, but some of
> registers used to indicate the base address of stolen memory can only be
> programmed once after system is powered-up. This will cause problems if
> the base of the stolen memory is changed during IGD passthrough.
>
> The solution of this patch series is allocating a new VM dedicated memory
> as "guest stolen memory" in QEMU for isolation and let the "guest stolen
> memory" sits in the same PA as host.
>
> Also it introduces Intel platform definitions and clears some old funtions
> and definitions.
>
> Zhi Wang (6):
>    vfio: Add Intel platform definitions
>    vfio: Setup IGD quirks earlier
>    vfio: Setup IGD stolen memory
>    vfio: Refine GGTT clearing
>    vfio: Remove extra quirks and old definitions
>    vfio: Setup IGD stolen memory under secondary mode
>
>   hw/vfio/Makefile.objs    |   2 +-
>   hw/vfio/intel-platform.c | 366 +++++++++++++++++++++++++++++++++++++++++++++++
>   hw/vfio/intel-platform.h |  38 +++++
>   hw/vfio/pci-quirks.c     | 322 ++++++++---------------------------------
>   4 files changed, 463 insertions(+), 265 deletions(-)
>   create mode 100644 hw/vfio/intel-platform.c
>   create mode 100644 hw/vfio/intel-platform.h