[Qemu-devel] [PULL 04/10] target/arm: Fill in ARMISARegisters for kvm32

[Peter Maydell <peter.maydell@linaro.org>]

From: Richard Henderson <richard.henderson@linaro.org>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181113180154.17903-5-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/kvm32.c | 40 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 5 deletions(-)

diff --git a/target/arm/kvm32.c b/target/arm/kvm32.c
index bc0badf53db..bd51eb43c86 100644
--- a/target/arm/kvm32.c
+++ b/target/arm/kvm32.c
@@ -44,7 +44,7 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
      * and then query that CPU for the relevant ID registers.
      */
     int err = 0, fdarray[3];
-    uint32_t midr, id_pfr0, mvfr1;
+    uint32_t midr, id_pfr0;
     uint64_t features = 0;
 
     /* Old kernels may not know about the PREFERRED_TARGET ioctl: however
@@ -71,9 +71,39 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
 
     err |= read_sys_reg32(fdarray[2], &midr, ARM_CP15_REG32(0, 0, 0, 0));
     err |= read_sys_reg32(fdarray[2], &id_pfr0, ARM_CP15_REG32(0, 0, 1, 0));
-    err |= read_sys_reg32(fdarray[2], &mvfr1,
+
+    err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar0,
+                          ARM_CP15_REG32(0, 0, 2, 0));
+    err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar1,
+                          ARM_CP15_REG32(0, 0, 2, 1));
+    err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar2,
+                          ARM_CP15_REG32(0, 0, 2, 2));
+    err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar3,
+                          ARM_CP15_REG32(0, 0, 2, 3));
+    err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar4,
+                          ARM_CP15_REG32(0, 0, 2, 4));
+    err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar5,
+                          ARM_CP15_REG32(0, 0, 2, 5));
+    if (read_sys_reg32(fdarray[2], &ahcf->isar.id_isar6,
+                       ARM_CP15_REG32(0, 0, 2, 7))) {
+        /*
+         * Older kernels don't support reading ID_ISAR6. This register was
+         * only introduced in ARMv8, so we can assume that it is zero on a
+         * CPU that a kernel this old is running on.
+         */
+        ahcf->isar.id_isar6 = 0;
+    }
+
+    err |= read_sys_reg32(fdarray[2], &ahcf->isar.mvfr0,
+                          KVM_REG_ARM | KVM_REG_SIZE_U32 |
+                          KVM_REG_ARM_VFP | KVM_REG_ARM_VFP_MVFR0);
+    err |= read_sys_reg32(fdarray[2], &ahcf->isar.mvfr1,
                           KVM_REG_ARM | KVM_REG_SIZE_U32 |
                           KVM_REG_ARM_VFP | KVM_REG_ARM_VFP_MVFR1);
+    /*
+     * FIXME: There is not yet a way to read MVFR2.
+     * Fortunately there is not yet anything in there that affects migration.
+     */
 
     kvm_arm_destroy_scratch_host_vcpu(fdarray);
 
@@ -95,13 +125,13 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
     if (extract32(id_pfr0, 12, 4) == 1) {
         set_feature(&features, ARM_FEATURE_THUMB2EE);
     }
-    if (extract32(mvfr1, 20, 4) == 1) {
+    if (extract32(ahcf->isar.mvfr1, 20, 4) == 1) {
         set_feature(&features, ARM_FEATURE_VFP_FP16);
     }
-    if (extract32(mvfr1, 12, 4) == 1) {
+    if (extract32(ahcf->isar.mvfr1, 12, 4) == 1) {
         set_feature(&features, ARM_FEATURE_NEON);
     }
-    if (extract32(mvfr1, 28, 4) == 1) {
+    if (extract32(ahcf->isar.mvfr1, 28, 4) == 1) {
         /* FMAC support implies VFPv4 */
         set_feature(&features, ARM_FEATURE_VFP4);
     }
-- 
2.19.1