[Xen-devel] [RFC PATCH 1/2] mem_access: Fix npfec.kind propagation

[George Dunlap <george.dunlap@xxxxxxxxxx>]

The name of the "with_gla" flag is confusing; it has nothing to do
with the existence or lack thereof of a faulting GLA, but rather where
the fault originated.  The npfec.kind value is always valid, and
should thus be propagated, regardless of whether gla_valid is set or
not.

In particular, gla_valid will never be set on AMD systems; but
npfec.kind will still be valid and should still be propagated.

Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
CC: Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>
CC: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/mm/mem_access.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/mm/mem_access.c b/xen/arch/x86/mm/mem_access.c
index d9e64fcbb9..699a315076 100644
--- a/xen/arch/x86/mm/mem_access.c
+++ b/xen/arch/x86/mm/mem_access.c
@@ -232,12 +232,12 @@ bool p2m_mem_access_check(paddr_t gpa, unsigned long gla,
         {
             req->u.mem_access.flags |= MEM_ACCESS_GLA_VALID;
             req->u.mem_access.gla = gla;
-
-            if ( npfec.kind == npfec_kind_with_gla )
-                req->u.mem_access.flags |= MEM_ACCESS_FAULT_WITH_GLA;
-            else if ( npfec.kind == npfec_kind_in_gpt )
-                req->u.mem_access.flags |= MEM_ACCESS_FAULT_IN_GPT;
         }
+
+        if ( npfec.kind == npfec_kind_with_gla )
+            req->u.mem_access.flags |= MEM_ACCESS_FAULT_WITH_GLA;
+        else if ( npfec.kind == npfec_kind_in_gpt )
+            req->u.mem_access.flags |= MEM_ACCESS_FAULT_IN_GPT;
         req->u.mem_access.flags |= npfec.read_access    ? MEM_ACCESS_R : 0;
         req->u.mem_access.flags |= npfec.write_access   ? MEM_ACCESS_W : 0;
         req->u.mem_access.flags |= npfec.insn_fetch     ? MEM_ACCESS_X : 0;
-- 
2.19.0


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