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| author |   Dave Martin <Dave.Martin@arm.com> | 2018-09-28 14:39:10 +0100 |
|---|---|---|
| committer |   Marc Zyngier <marc.zyngier@arm.com> | 2019-03-29 14:41:52 +0000 |
| commit | d06b76be8dad2e2fa62f68264887cc295d67a3ef (patch) | |
| tree | 38203fa633b3e90e6d6e0c95eb766520fb5b30f3 /arch/arm64/kernel/cpufeature.c | |
| parent | arm64/sve: Clarify role of the VQ map maintenance functions (diff) | |
| download | linux-dev-d06b76be8dad2e2fa62f68264887cc295d67a3ef.tar.xz linux-dev-d06b76be8dad2e2fa62f68264887cc295d67a3ef.zip | |
arm64/sve: Check SVE virtualisability
Due to the way the effective SVE vector length is controlled and
trapped at different exception levels, certain mismatches in the
sets of vector lengths supported by different physical CPUs in the
system may prevent straightforward virtualisation of SVE at parity
with the host.
This patch analyses the extent to which SVE can be virtualised
safely without interfering with migration of vcpus between physical
CPUs, and rejects late secondary CPUs that would erode the
situation further.
It is left up to KVM to decide what to do with this information.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Tested-by: zhang.lei <zhang.lei@jp.fujitsu.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/kernel/cpufeature.c')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 4061de10cea6..7f8cc51f0740 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1863,7 +1863,7 @@ static void verify_sve_features(void) unsigned int len = zcr & ZCR_ELx_LEN_MASK; if (len < safe_len || sve_verify_vq_map()) { - pr_crit("CPU%d: SVE: required vector length(s) missing\n", + pr_crit("CPU%d: SVE: vector length support mismatch\n", smp_processor_id()); cpu_die_early(); } |