[PATCH v2 4/7] xen/arm: Add handler for ID registers on arm64

[Bertrand Marquis <bertrand.marquis@xxxxxxx>]

Add vsysreg emulation for registers trapped when TID3 bit is activated
in HSR.
The emulation is returning the value stored in cpuinfo_guest structure
for most values and the hardware value for registers not stored in the
structure (those are mostly registers existing only as a provision for
feature use but who have no definition right now).

Signed-off-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
Changes in V2: rebase
---
 xen/arch/arm/arm64/vsysreg.c | 49 ++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/xen/arch/arm/arm64/vsysreg.c b/xen/arch/arm/arm64/vsysreg.c
index 8a85507d9d..970ef51603 100644
--- a/xen/arch/arm/arm64/vsysreg.c
+++ b/xen/arch/arm/arm64/vsysreg.c
@@ -69,6 +69,14 @@ TVM_REG(CONTEXTIDR_EL1)
         break;                                                          \
     }
 
+/* Macro to generate easily case for ID co-processor emulation */
+#define GENERATE_TID3_INFO(reg,field,offset)                            \
+    case HSR_SYSREG_##reg:                                              \
+    {                                                                   \
+        return handle_ro_read_val(regs, regidx, hsr.sysreg.read, hsr,   \
+                          1, guest_cpuinfo.field.bits[offset]);         \
+    }
+
 void do_sysreg(struct cpu_user_regs *regs,
                const union hsr hsr)
 {
@@ -259,6 +267,47 @@ void do_sysreg(struct cpu_user_regs *regs,
          */
         return handle_raz_wi(regs, regidx, hsr.sysreg.read, hsr, 1);
 
+    /*
+     * HCR_EL2.TID3
+     *
+     * This is trapping most Identification registers used by a guest
+     * to identify the processor features
+     */
+    GENERATE_TID3_INFO(ID_PFR0_EL1, pfr32, 0)
+    GENERATE_TID3_INFO(ID_PFR1_EL1, pfr32, 1)
+    GENERATE_TID3_INFO(ID_PFR2_EL1, pfr32, 2)
+    GENERATE_TID3_INFO(ID_DFR0_EL1, dbg32, 0)
+    GENERATE_TID3_INFO(ID_DFR1_EL1, dbg32, 1)
+    GENERATE_TID3_INFO(ID_AFR0_EL1, aux32, 0)
+    GENERATE_TID3_INFO(ID_MMFR0_EL1, mm32, 0)
+    GENERATE_TID3_INFO(ID_MMFR1_EL1, mm32, 1)
+    GENERATE_TID3_INFO(ID_MMFR2_EL1, mm32, 2)
+    GENERATE_TID3_INFO(ID_MMFR3_EL1, mm32, 3)
+    GENERATE_TID3_INFO(ID_MMFR4_EL1, mm32, 4)
+    GENERATE_TID3_INFO(ID_MMFR5_EL1, mm32, 5)
+    GENERATE_TID3_INFO(ID_ISAR0_EL1, isa32, 0)
+    GENERATE_TID3_INFO(ID_ISAR1_EL1, isa32, 1)
+    GENERATE_TID3_INFO(ID_ISAR2_EL1, isa32, 2)
+    GENERATE_TID3_INFO(ID_ISAR3_EL1, isa32, 3)
+    GENERATE_TID3_INFO(ID_ISAR4_EL1, isa32, 4)
+    GENERATE_TID3_INFO(ID_ISAR5_EL1, isa32, 5)
+    GENERATE_TID3_INFO(ID_ISAR6_EL1, isa32, 6)
+    GENERATE_TID3_INFO(MVFR0_EL1, mvfr, 0)
+    GENERATE_TID3_INFO(MVFR1_EL1, mvfr, 1)
+    GENERATE_TID3_INFO(MVFR2_EL1, mvfr, 2)
+    GENERATE_TID3_INFO(ID_AA64PFR0_EL1, pfr64, 0)
+    GENERATE_TID3_INFO(ID_AA64PFR1_EL1, pfr64, 1)
+    GENERATE_TID3_INFO(ID_AA64DFR0_EL1, dbg64, 0)
+    GENERATE_TID3_INFO(ID_AA64DFR1_EL1, dbg64, 1)
+    GENERATE_TID3_INFO(ID_AA64ISAR0_EL1, isa64, 0)
+    GENERATE_TID3_INFO(ID_AA64ISAR1_EL1, isa64, 1)
+    GENERATE_TID3_INFO(ID_AA64MMFR0_EL1, mm64, 0)
+    GENERATE_TID3_INFO(ID_AA64MMFR1_EL1, mm64, 1)
+    GENERATE_TID3_INFO(ID_AA64MMFR2_EL1, mm64, 2)
+    GENERATE_TID3_INFO(ID_AA64AFR0_EL1, aux64, 0)
+    GENERATE_TID3_INFO(ID_AA64AFR1_EL1, aux64, 1)
+    GENERATE_TID3_INFO(ID_AA64ZFR0_EL1, zfr64, 0)
+
     /*
      * HCR_EL2.TIDCP
      *
-- 
2.17.1