Occasionally we see pcid test fail as INVPCID_DESC[127:64] is
uninitialized before execute invpcid.
According to Intel spec: "#GP If INVPCID_TYPE is 0 and the linear
address in INVPCID_DESC[127:64] is not canonical."
Assign desc's address which is guaranteed to be a real memory
address and canonical.
Fixes: b44d84dae10c ("Add PCID/INVPCID test")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxx>
---
x86/pcid.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/x86/pcid.c b/x86/pcid.c
index 527a4a9..4828bbc 100644
--- a/x86/pcid.c
+++ b/x86/pcid.c
@@ -75,6 +75,9 @@ static void test_invpcid_enabled(int pcid_enabled)
struct invpcid_desc desc;
desc.rsv = 0;
+ /* Initialize INVPCID_DESC[127:64] with a canonical address */
+ desc.addr = (u64)&desc;
+
/* try executing invpcid when CR4.PCIDE=0, desc.pcid=0 and type=0..3
* no exception expected
*/
--
2.25.1
