diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2022-06-08 19:38:59 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2022-06-08 19:38:59 +0100 |
| commit | 414c54d515dba16bfaef643a8acec200c05f229a (patch) | |
| tree | 7e67548bc1de794e33dbee7ae802b23f3f953b5c /target/arm/kvm64.c | |
| parent | f305bf9436896b4cd9ef622034e166b024780874 (diff) | |
target/arm: Add ID_AA64SMFR0_EL1pull-target-arm-20220609
This register is allocated from the existing block of id registers,
so it is already RES0 for cpus that do not implement SME.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220607203306.657998-21-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target/arm/kvm64.c')
| -rw-r--r-- | target/arm/kvm64.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index b3f635fc95..ff8f65da22 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -574,6 +574,8 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) } else { err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64pfr1, ARM64_SYS_REG(3, 0, 0, 4, 1)); + err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64smfr0, + ARM64_SYS_REG(3, 0, 0, 4, 5)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64dfr0, ARM64_SYS_REG(3, 0, 0, 5, 0)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64dfr1, @@ -682,10 +684,11 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) ahcf->isar.id_aa64pfr0 = t; /* - * Before v5.1, KVM did not support SVE and did not expose - * ID_AA64ZFR0_EL1 even as RAZ. After v5.1, KVM still does - * not expose the register to "user" requests like this - * unless the host supports SVE. + * There is a range of kernels between kernel commit 73433762fcae + * and f81cb2c3ad41 which have a bug where the kernel doesn't expose + * SYS_ID_AA64ZFR0_EL1 via the ONE_REG API unless the VM has enabled + * SVE support, so we only read it here, rather than together with all + * the other ID registers earlier. */ err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64zfr0, ARM64_SYS_REG(3, 0, 0, 4, 4)); |