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>
--- 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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