コード例 #1
0
ファイル: fpsimd.c プロジェクト: 0x7f454c46/linux
/*
 * Write back the vcpu FPSIMD regs if they are dirty, and invalidate the
 * cpu FPSIMD regs so that they can't be spuriously reused if this vcpu
 * disappears and another task or vcpu appears that recycles the same
 * struct fpsimd_state.
 */
void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
{
	unsigned long flags;

	local_irq_save(flags);

	if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) {
		/* Clean guest FP state to memory and invalidate cpu view */
		fpsimd_save();
		fpsimd_flush_cpu_state();
	} else if (system_supports_sve()) {
		/*
		 * The FPSIMD/SVE state in the CPU has not been touched, and we
		 * have SVE (and VHE): CPACR_EL1 (alias CPTR_EL2) has been
		 * reset to CPACR_EL1_DEFAULT by the Hyp code, disabling SVE
		 * for EL0.  To avoid spurious traps, restore the trap state
		 * seen by kvm_arch_vcpu_load_fp():
		 */
		if (vcpu->arch.flags & KVM_ARM64_HOST_SVE_ENABLED)
			sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_ZEN_EL0EN);
		else
			sysreg_clear_set(CPACR_EL1, CPACR_EL1_ZEN_EL0EN, 0);
	}

	update_thread_flag(TIF_SVE,
			   vcpu->arch.flags & KVM_ARM64_HOST_SVE_IN_USE);

	local_irq_restore(flags);
}
コード例 #2
0
ファイル: fpsimd.c プロジェクト: CCNITSilchar/linux
/*
 * Write back the vcpu FPSIMD regs if they are dirty, and invalidate the
 * cpu FPSIMD regs so that they can't be spuriously reused if this vcpu
 * disappears and another task or vcpu appears that recycles the same
 * struct fpsimd_state.
 */
void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
{
	local_bh_disable();

	update_thread_flag(TIF_SVE,
			   vcpu->arch.flags & KVM_ARM64_HOST_SVE_IN_USE);

	if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) {
		/* Clean guest FP state to memory and invalidate cpu view */
		fpsimd_save();
		fpsimd_flush_cpu_state();
	} else if (!test_thread_flag(TIF_FOREIGN_FPSTATE)) {
		/* Ensure user trap controls are correctly restored */
		fpsimd_bind_task_to_cpu();
	}

	local_bh_enable();
}