[xen staging] xen/arm: Hide Pointer Authentication (PAC)

[patchbot@xxxxxxx]

commit 3d64806ba5cd2ac4a01844e63c023c8c2e0aca9f
Author:     Vladimir Murzin <vladimir.murzin@xxxxxxx>
AuthorDate: Wed Jan 20 11:27:12 2021 +0000
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Wed Jan 20 17:42:27 2021 +0000

    xen/arm: Hide Pointer Authentication (PAC)
    
    The ARMv8.3 Pointer Authentication extension is not supported by Xen
    at the moment, so do not expose that via ID register.
    
    Signed-off-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    [julien: s/__res0/__res2/ to avoid name duplication]
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/arch/arm/cpufeature.c        |  6 ++++++
 xen/include/asm-arm/cpufeature.h | 38 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/cpufeature.c b/xen/arch/arm/cpufeature.c
index 99fe4db280..1d88783809 100644
--- a/xen/arch/arm/cpufeature.c
+++ b/xen/arch/arm/cpufeature.c
@@ -187,6 +187,12 @@ static int __init create_guest_cpuinfo(void)
 
     /* Hide MTE support as Xen does not support it */
     guest_cpuinfo.pfr64.mte = 0;
+
+    /* Hide PAC support as Xen does not support it */
+    guest_cpuinfo.isa64.apa = 0;
+    guest_cpuinfo.isa64.api = 0;
+    guest_cpuinfo.isa64.gpa = 0;
+    guest_cpuinfo.isa64.gpi = 0;
 #endif
 
     /* Hide AMU support */
diff --git a/xen/include/asm-arm/cpufeature.h b/xen/include/asm-arm/cpufeature.h
index 13a2739a69..70cb67301f 100644
--- a/xen/include/asm-arm/cpufeature.h
+++ b/xen/include/asm-arm/cpufeature.h
@@ -212,8 +212,44 @@ struct cpuinfo_arm {
         };
     } mm64;
 
-    struct {
+    union {
         uint64_t bits[2];
+        struct {
+            /* ISAR0 */
+            unsigned long __res0:4;
+            unsigned long aes:4;
+            unsigned long sha1:4;
+            unsigned long sha2:4;
+            unsigned long crc32:4;
+            unsigned long atomic:4;
+            unsigned long __res1:4;
+            unsigned long rdm:4;
+            unsigned long sha3:4;
+            unsigned long sm3:4;
+            unsigned long sm4:4;
+            unsigned long dp:4;
+            unsigned long fhm:4;
+            unsigned long ts:4;
+            unsigned long tlb:4;
+            unsigned long rndr:4;
+
+            /* ISAR1 */
+            unsigned long dpb:4;
+            unsigned long apa:4;
+            unsigned long api:4;
+            unsigned long jscvt:4;
+            unsigned long fcma:4;
+            unsigned long lrcpc:4;
+            unsigned long gpa:4;
+            unsigned long gpi:4;
+            unsigned long frintts:4;
+            unsigned long sb:4;
+            unsigned long specres:4;
+            unsigned long bf16:4;
+            unsigned long dgh:4;
+            unsigned long i8mm:4;
+            unsigned long __res2:8;
+        };
     } isa64;
 
     struct {
--
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