[xen staging-4.16] xen/arm: Add ECBHB and CLEARBHB ID fields

[patchbot@xxxxxxx]

commit 8aa3833db97e8fe1143c5ece110b9321ce1494ea
Author:     Bertrand Marquis <bertrand.marquis@xxxxxxx>
AuthorDate: Wed Feb 23 09:42:18 2022 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Mar 8 17:15:41 2022 +0000

    xen/arm: Add ECBHB and CLEARBHB ID fields
    
    Introduce ID coprocessor register ID_AA64ISAR2_EL1.
    Add definitions in cpufeature and sysregs of ECBHB field in mmfr1 and
    CLEARBHB in isar2 ID coprocessor registers.
    
    This is part of XSA-398 / CVE-2022-23960.
    
    Signed-off-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Acked-by: Julien Grall <julien@xxxxxxx>
    (cherry picked from commit 4b68d12d98b8790d8002fcc2c25a9d713374a4d7)
---
 xen/arch/arm/cpufeature.c           |  1 +
 xen/include/asm-arm/arm64/sysregs.h |  7 +++++++
 xen/include/asm-arm/cpufeature.h    | 11 +++++++++--
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/cpufeature.c b/xen/arch/arm/cpufeature.c
index 6e51f530a8..a58965f7b9 100644
--- a/xen/arch/arm/cpufeature.c
+++ b/xen/arch/arm/cpufeature.c
@@ -122,6 +122,7 @@ void identify_cpu(struct cpuinfo_arm *c)
 
     c->isa64.bits[0] = READ_SYSREG(ID_AA64ISAR0_EL1);
     c->isa64.bits[1] = READ_SYSREG(ID_AA64ISAR1_EL1);
+    c->isa64.bits[2] = READ_SYSREG(ID_AA64ISAR2_EL1);
 
     c->zfr64.bits[0] = READ_SYSREG(ID_AA64ZFR0_EL1);
 
diff --git a/xen/include/asm-arm/arm64/sysregs.h 
b/xen/include/asm-arm/arm64/sysregs.h
index d7e4772f21..eac08ed33f 100644
--- a/xen/include/asm-arm/arm64/sysregs.h
+++ b/xen/include/asm-arm/arm64/sysregs.h
@@ -84,6 +84,9 @@
 #ifndef ID_DFR1_EL1
 #define ID_DFR1_EL1                 S3_0_C0_C3_5
 #endif
+#ifndef ID_AA64ISAR2_EL1
+#define ID_AA64ISAR2_EL1            S3_0_C0_C6_2
+#endif
 
 /* ID registers (imported from arm64/include/asm/sysreg.h in Linux) */
 
@@ -139,6 +142,9 @@
 #define ID_AA64ISAR1_GPI_NI                     0x0
 #define ID_AA64ISAR1_GPI_IMP_DEF                0x1
 
+/* id_aa64isar2 */
+#define ID_AA64ISAR2_CLEARBHB_SHIFT 28
+
 /* id_aa64pfr0 */
 #define ID_AA64PFR0_CSV3_SHIFT       60
 #define ID_AA64PFR0_CSV2_SHIFT       56
@@ -232,6 +238,7 @@
 #define ID_AA64MMFR0_PARANGE_52        0x6
 
 /* id_aa64mmfr1 */
+#define ID_AA64MMFR1_ECBHB_SHIFT     60
 #define ID_AA64MMFR1_ETS_SHIFT       36
 #define ID_AA64MMFR1_TWED_SHIFT      32
 #define ID_AA64MMFR1_XNX_SHIFT       28
diff --git a/xen/include/asm-arm/cpufeature.h b/xen/include/asm-arm/cpufeature.h
index 8a5afbaf0b..db126508f1 100644
--- a/xen/include/asm-arm/cpufeature.h
+++ b/xen/include/asm-arm/cpufeature.h
@@ -243,14 +243,15 @@ struct cpuinfo_arm {
             unsigned long lo:4;
             unsigned long pan:4;
             unsigned long __res1:8;
-            unsigned long __res2:32;
+            unsigned long __res2:28;
+            unsigned long ecbhb:4;
 
             unsigned long __res3:64;
         };
     } mm64;
 
     union {
-        register_t bits[2];
+        register_t bits[3];
         struct {
             /* ISAR0 */
             unsigned long __res0:4;
@@ -286,6 +287,12 @@ struct cpuinfo_arm {
             unsigned long dgh:4;
             unsigned long i8mm:4;
             unsigned long __res2:8;
+
+            /* ISAR2 */
+            unsigned long __res3:28;
+            unsigned long clearbhb:4;
+
+            unsigned long __res4:32;
         };
     } isa64;
 
--
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