> -----Original Message-----
> From: Jan Beulich [mailto:jbeul...@suse.com]
> Sent: 13 November 2018 10:47
> To: xen-devel <xen-devel@lists.xenproject.org>; Jan Beulich
> <jbeul...@suse.com>
> Cc: Andrew Cooper <andrew.coop...@citrix.com>; Paul Durrant
> <paul.durr...@citrix.com>; Wei Liu <wei.l...@citrix.com>
> Subject: [PATCH 4/3] x86/HVM: hvm_map_guest_frame_rw() should respect
> p2m_ioreq_server
>
> Writes to such pages would need to be handed to the emulator, which we're
> not prepared to do at this point.
>
> Signed-off-by: Jan Beulich <jbeul...@suse.com>
Patch #4 out of 3? :-)
Reviewed-by: Paul Durrant <paul.durr...@citrix.com>
>
> --- a/xen/arch/x86/hvm/hvm.c
> +++ b/xen/arch/x86/hvm/hvm.c
> @@ -2556,7 +2556,8 @@ static void *_hvm_map_guest_frame(unsign
>
> if ( writable )
> {
> - if ( unlikely(p2m_is_discard_write(p2mt)) )
> + if ( unlikely(p2m_is_discard_write(p2mt)) ||
> + unlikely(p2mt == p2m_ioreq_server) )
> *writable = 0;
> else if ( !permanent )
> paging_mark_pfn_dirty(d, _pfn(gfn));
>
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