Re: [PATCH v2 0/3] drop writes to read-only ram device & vfio regions

[Yan Zhao]

Forgot the changelog, so sent this patch 0/3 again.
sorry about that.

On Sat, Apr 04, 2020 at 01:08:23AM +0800, Zhao, Yan Y wrote:
> patch 1 modifies handler of ram device memory regions to drop guest writes
> to read-only ram device memory regions
> 
> patch 2 modifies handler of non-mmap'd read-only vfio regions to drop guest
> writes to those regions 
> 
> patch 3 let mmap'd read-only vfio regions be able to generate vmexit for
> guest write. so, without patch 1, host qemu would crash on guest write to
> this read-only region. with patch 1, host qemu would drop the writes.
> 
> Changelog:
> v2:
> -split one big patches into smaller ones (Philippe)
> -modify existing trace to record guest writes to read-only memory (Alex)
> -modify vfio_region_write() to drop guest writes to non-mmap'd read-only
>  region (Alex)
> 
> Yan Zhao (3):
>   memory: drop guest writes to read-only ram device regions
>   hw/vfio: drop guest writes to ro regions
>   hw/vfio: let read-only flag take effect for mmap'd regions
> 
>  hw/vfio/common.c     | 12 +++++++++++-
>  hw/vfio/trace-events |  2 +-
>  memory.c             |  6 +++++-
>  trace-events         |  2 +-
>  4 files changed, 18 insertions(+), 4 deletions(-)
> 
> -- 
> 2.17.1
>