[Qemu-devel] [PATCH v2 01/27] target/arm: Add state for the ARMv8.3-PAuth extension

[Richard Henderson <richard.henderson@linaro.org>]

Add storage space for the 5 encryption keys.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
----
v2: Remove pointless double migration.
    Use a struct to make it clear which half is which.
---
 target/arm/cpu.h | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index c943f35dd9..39d4afdfe6 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -201,11 +201,16 @@ typedef struct ARMVectorReg {
     uint64_t d[2 * ARM_MAX_VQ] QEMU_ALIGNED(16);
 } ARMVectorReg;
 
-/* In AArch32 mode, predicate registers do not exist at all.  */
 #ifdef TARGET_AARCH64
+/* In AArch32 mode, predicate registers do not exist at all.  */
 typedef struct ARMPredicateReg {
     uint64_t p[2 * ARM_MAX_VQ / 8] QEMU_ALIGNED(16);
 } ARMPredicateReg;
+
+/* In AArch32 mode, PAC keys do not exist at all.  */
+typedef struct ARMPACKey {
+    uint64_t lo, hi;
+} ARMPACKey;
 #endif
 
 
@@ -605,6 +610,14 @@ typedef struct CPUARMState {
         uint32_t cregs[16];
     } iwmmxt;
 
+#ifdef TARGET_AARCH64
+    ARMPACKey apia_key;
+    ARMPACKey apib_key;
+    ARMPACKey apda_key;
+    ARMPACKey apdb_key;
+    ARMPACKey apga_key;
+#endif
+
 #if defined(CONFIG_USER_ONLY)
     /* For usermode syscall translation.  */
     int eabi;
@@ -3324,6 +3337,21 @@ static inline bool isar_feature_aa64_fcma(const ARMISARegisters *id)
     return FIELD_EX64(id->id_aa64isar1, ID_AA64ISAR1, FCMA) != 0;
 }
 
+static inline bool isar_feature_aa64_pauth(const ARMISARegisters *id)
+{
+    /*
+     * Note that while QEMU will only implement the architected algorithm
+     * QARMA, and thus APA+GPA, the host cpu for kvm may use implementation
+     * defined algorithms, and thus API+GPI, and this predicate controls
+     * migration of the 128-bit keys.
+     */
+    return (id->id_aa64isar1 &
+            (FIELD_DP64(0, ID_AA64ISAR1, APA, -1) |
+             FIELD_DP64(0, ID_AA64ISAR1, API, -1) |
+             FIELD_DP64(0, ID_AA64ISAR1, GPA, -1) |
+             FIELD_DP64(0, ID_AA64ISAR1, GPI, -1))) != 0;
+}
+
 static inline bool isar_feature_aa64_fp16(const ARMISARegisters *id)
 {
     /* We always set the AdvSIMD and FP fields identically wrt FP16.  */
-- 
2.17.2