Write accesses to p2m_ioreq_server pages should get redirected to the
emulator also when using the mapping approach. Extend the
p2m_is_discard_write() check there, and restrict both to the write
access case (this is just a latent bug as currently we go this route
only for write accesses).
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -613,10 +613,21 @@ static void *hvmemul_map_linear_addr(
*mfn++ = page_to_mfn(page);
- if ( p2m_is_discard_write(p2mt) )
+ if ( pfec & PFEC_write_access )
{
- err = ERR_PTR(~X86EMUL_OKAY);
- goto out;
+ if ( p2m_is_discard_write(p2mt) )
+ {
+ err = ERR_PTR(~X86EMUL_OKAY);
+ goto out;
+ }
+
+ if ( p2mt == p2m_ioreq_server )
+ {
+ err = NULL;
+ goto out;
+ }
+
+ ASSERT(p2mt == p2m_ram_logdirty || !p2m_is_readonly(p2mt));
}
}
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