[Qemu-devel] [PATCH 05/13] target/arm/kvm: Add kvm_arch_get/put_sve

[Andrew Jones <drjones@redhat.com>]

These are the SVE equivalents to kvm_arch_get/put_fpsimd.

Signed-off-by: Andrew Jones <drjones@redhat.com>
---
 target/arm/kvm64.c | 127 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 123 insertions(+), 4 deletions(-)

diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
index 61947f3716e1..86362f4cd7d0 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -658,11 +658,12 @@ int kvm_arch_init_vcpu(CPUState *cs)
 bool kvm_arm_reg_syncs_via_cpreg_list(uint64_t regidx)
 {
     /* Return true if the regidx is a register we should synchronize
-     * via the cpreg_tuples array (ie is not a core reg we sync by
-     * hand in kvm_arch_get/put_registers())
+     * via the cpreg_tuples array (ie is not a core or sve reg that
+     * we sync by hand in kvm_arch_get/put_registers())
      */
     switch (regidx & KVM_REG_ARM_COPROC_MASK) {
     case KVM_REG_ARM_CORE:
+    case KVM_REG_ARM64_SVE:
         return false;
     default:
         return true;
@@ -748,6 +749,61 @@ static int kvm_arch_put_fpsimd(CPUState *cs)
     return 0;
 }
 
+static int kvm_arch_put_sve(CPUState *cs)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    CPUARMState *env = &cpu->env;
+    struct kvm_one_reg reg;
+    int n, ret;
+
+    for (n = 0; n < KVM_ARM64_SVE_NUM_ZREGS; n++) {
+        uint64_t *q = aa64_vfp_qreg(env, n);
+#ifdef HOST_WORDS_BIGENDIAN
+        uint64_t d[ARM_MAX_VQ * 2];
+        int i;
+        for (i = 0; i < cpu->sve_max_vq * 2; i++) {
+            d[i] = q[cpu->sve_max_vq * 2 - 1 - i];
+        }
+        reg.addr = (uintptr_t)d;
+#else
+        reg.addr = (uintptr_t)q;
+#endif
+        reg.id = KVM_REG_ARM64_SVE_ZREG(n, 0);
+        ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+        if (ret) {
+            return ret;
+        }
+    }
+
+    for (n = 0; n < KVM_ARM64_SVE_NUM_PREGS; n++) {
+        uint64_t *p = &env->vfp.pregs[n].p[0];
+#ifdef HOST_WORDS_BIGENDIAN
+        uint64_t d[ARM_MAX_VQ * 2];
+        int i;
+        for (i = 0; i < cpu->sve_max_vq * 2 / 8; i++) {
+            d[i] = p[cpu->sve_max_vq * 2 / 8 - 1 - i];
+        }
+        reg.addr = (uintptr_t)d;
+#else
+        reg.addr = (uintptr_t)p;
+#endif
+        reg.id = KVM_REG_ARM64_SVE_PREG(n, 0);
+        ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+        if (ret) {
+            return ret;
+        }
+    }
+
+    reg.addr = (uintptr_t)&env->vfp.pregs[FFR_PRED_NUM].p[0];
+    reg.id = KVM_REG_ARM64_SVE_FFR(0);
+    ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+    if (ret) {
+        return ret;
+    }
+
+    return 0;
+}
+
 int kvm_arch_put_registers(CPUState *cs, int level)
 {
     struct kvm_one_reg reg;
@@ -842,7 +898,11 @@ int kvm_arch_put_registers(CPUState *cs, int level)
         }
     }
 
-    ret = kvm_arch_put_fpsimd(cs);
+    if (!cpu_isar_feature(aa64_sve, cpu)) {
+        ret = kvm_arch_put_fpsimd(cs);
+    } else {
+        ret = kvm_arch_put_sve(cs);
+    }
     if (ret) {
         return ret;
     }
@@ -905,6 +965,61 @@ static int kvm_arch_get_fpsimd(CPUState *cs)
     return 0;
 }
 
+static int kvm_arch_get_sve(CPUState *cs)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    CPUARMState *env = &cpu->env;
+    struct kvm_one_reg reg;
+    int n, ret;
+
+    for (n = 0; n < KVM_ARM64_SVE_NUM_ZREGS; n++) {
+        uint64_t *q = aa64_vfp_qreg(env, n);
+        reg.id = KVM_REG_ARM64_SVE_ZREG(n, 0);
+        reg.addr = (uintptr_t)q;
+        ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+        if (ret) {
+            return ret;
+        } else {
+#ifdef HOST_WORDS_BIGENDIAN
+            int i = 0, j = cpu->sve_max_vq * 2 - 1;
+            while (i < j) {
+                uint64_t t;
+                t = q[i], q[i] = q[j], q[j] = t;
+                ++i, --j;
+            }
+#endif
+        }
+    }
+
+    for (n = 0; n < KVM_ARM64_SVE_NUM_PREGS; n++) {
+        uint64_t *p = &env->vfp.pregs[n].p[0];
+        reg.id = KVM_REG_ARM64_SVE_PREG(n, 0);
+        reg.addr = (uintptr_t)p;
+        ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+        if (ret) {
+            return ret;
+        } else {
+#ifdef HOST_WORDS_BIGENDIAN
+            int i = 0, j = cpu->sve_max_vq * 2 / 8 - 1;
+            while (i < j) {
+                uint64_t t;
+                t = q[i], q[i] = q[j], q[j] = t;
+                ++i, --j;
+            }
+#endif
+        }
+    }
+
+    reg.addr = (uintptr_t)&env->vfp.pregs[FFR_PRED_NUM].p[0];
+    reg.id = KVM_REG_ARM64_SVE_FFR(0);
+    ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+    if (ret) {
+        return ret;
+    }
+
+    return 0;
+}
+
 int kvm_arch_get_registers(CPUState *cs)
 {
     struct kvm_one_reg reg;
@@ -999,7 +1114,11 @@ int kvm_arch_get_registers(CPUState *cs)
         env->spsr = env->banked_spsr[i];
     }
 
-    ret = kvm_arch_get_fpsimd(cs);
+    if (!cpu_isar_feature(aa64_sve, cpu)) {
+        ret = kvm_arch_get_fpsimd(cs);
+    } else {
+        ret = kvm_arch_get_sve(cs);
+    }
     if (ret) {
         return ret;
     }
-- 
2.20.1