[Xen-changelog] [xen staging] x86/HVM: hvm_map_guest_frame_rw() should respect p2m_ioreq_server

[patchbot@xxxxxxx]

commit 1f04469a0793fb9500d51215ee935849ec74ed56
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Nov 15 16:43:03 2018 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Nov 15 16:43:03 2018 +0100

    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 <jbeulich@xxxxxxxx>
    Reviewed-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 65ab6a9b23..0bc676cd94 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -2558,7 +2558,8 @@ static void *_hvm_map_guest_frame(unsigned long gfn, 
bool_t permanent,
 
     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));
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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