diff options
| author | Nianyao Tang <tangnianyao@huawei.com> | 2022-12-20 18:50:24 +0800 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-01-12 21:15:16 +0000 |
| commit | 59d78a2ec0e9cfba5935f3a0d3f14a771461cded (patch) | |
| tree | 1a716454c69cfd36b94d8a957f6435498fd12cd4 | |
| parent | 7a5e9c8f0b2d18fa5e7f2b8e4ef68464fa3bc83e (diff) | |
KVM: arm64: Synchronize SMEN on vcpu schedule out
If we have VHE and need to reenable SME for host in
kvm_arch_vcpu_put_fp, CPACR.SMEN is modified from 0 to 1. Trap
control for reading SVCR is modified from enable to disable.
Synchronization is needed before reading SVCR later in
fpsimd_save, or it may cause sync exception which can not be
handled by host.
Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Nianyao Tang <tangnianyao@huawei.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221220105024.13484-1-dongbo4@huawei.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
| -rw-r--r-- | arch/arm64/kvm/fpsimd.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c index 02dd7e9ebd39..f5799f571317 100644 --- a/arch/arm64/kvm/fpsimd.c +++ b/arch/arm64/kvm/fpsimd.c @@ -184,6 +184,7 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) sysreg_clear_set(CPACR_EL1, CPACR_EL1_SMEN_EL0EN, CPACR_EL1_SMEN_EL1EN); + isb(); } if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED) { |