[Xen-devel] [PATCH 1/2] x86/pv: Fix determination of 64bit mode in emulate_privilege_op()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

ctxt->addr_size is expressed in bits rather than bytes, and has the value 16,
32 or 64.  Comparing < 8 made the intended non-64bit paths dead.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/traps.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 2d211d1..a33109d 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -2100,7 +2100,7 @@ static int pv_emul_virt_to_linear(unsigned long base, 
unsigned long offset,
 
     *addr = base + offset;
 
-    if ( ctxt->addr_size < 8 )
+    if ( ctxt->addr_size < 64 )
     {
         if ( limit < bytes - 1 || offset > limit - bytes + 1 )
             rc = X86EMUL_EXCEPTION;
@@ -2169,7 +2169,7 @@ static int priv_op_read_segment(enum x86_segment seg,
                                 struct segment_register *reg,
                                 struct x86_emulate_ctxt *ctxt)
 {
-    if ( ctxt->addr_size < 8 )
+    if ( ctxt->addr_size < 64 )
     {
         unsigned long limit;
         unsigned int sel, ar;
-- 
2.1.4


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