diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-03-11 21:29:55 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-03-18 17:23:12 +0300 |
| commit | 8c8010d69c1322734a272eb95dbbf42b5190e565 (patch) | |
| tree | b67366c7598da31074f57b7de4e569fff294dde7 /arch/arm64/kvm/hyp/nvhe/switch.c | |
| parent | beed09067b428a7e84a53b05c1de1f93c8460e91 (diff) | |
KVM: arm64: Save/restore SVE state for nVHE
Implement the SVE save/restore for nVHE, following a similar
logic to that of the VHE implementation:
- the SVE state is switched on trap from EL1 to EL2
- no further changes to ZCR_EL2 occur as long as the guest isn't
preempted or exit to userspace
- ZCR_EL2 is reset to its default value on the first SVE access from
the host EL1, and ZCR_EL1 restored to the default guest value in
vcpu_put()
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/switch.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/switch.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c index 60adc7ff4caa..b3fc0169268f 100644 --- a/arch/arm64/kvm/hyp/nvhe/switch.c +++ b/arch/arm64/kvm/hyp/nvhe/switch.c @@ -41,9 +41,9 @@ static void __activate_traps(struct kvm_vcpu *vcpu) __activate_traps_common(vcpu); val = CPTR_EL2_DEFAULT; - val |= CPTR_EL2_TTA | CPTR_EL2_TZ | CPTR_EL2_TAM; + val |= CPTR_EL2_TTA | CPTR_EL2_TAM; if (!update_fp_enabled(vcpu)) { - val |= CPTR_EL2_TFP; + val |= CPTR_EL2_TFP | CPTR_EL2_TZ; __activate_traps_fpsimd32(vcpu); } |