From: Nianyao Tang <[email protected]> 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 <[email protected]> Cc: James Morse <[email protected]> Cc: Alexandru Elisei <[email protected]> Cc: Suzuki K Poulose <[email protected]> Cc: Oliver Upton <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Nianyao Tang <[email protected]> --- arch/arm64/kvm/fpsimd.c | 1 + 1 file changed, 1 insertion(+) 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) { -- 1.8.3.1 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
