From 3c3efcf7dac4ea91bfa06681e879185995fa113c Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Mon, 19 Nov 2018 15:29:08 +0000 Subject: [PATCH] target/arm: Fill in ARMISARegisters for kvm32 Signed-off-by: Richard Henderson Message-id: 20181113180154.17903-5-richard.henderson@linaro.org Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- 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 bc0badf53d..bd51eb43c8 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); }