fpsimd.c (4b4193256c8d3bc3a5397b5cd9494c2ad386317d) fpsimd.c (83857371d4cbeff8551fa770e045be9c6b04715c)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/arm64/kvm/fpsimd.c: Guest/host FPSIMD context coordination helpers
4 *
5 * Copyright 2018 Arm Limited
6 * Author: Dave Martin <Dave.Martin@arm.com>
7 */
8#include <linux/irqflags.h>
9#include <linux/sched.h>
10#include <linux/thread_info.h>
11#include <linux/kvm_host.h>
12#include <asm/fpsimd.h>
13#include <asm/kvm_asm.h>
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/arm64/kvm/fpsimd.c: Guest/host FPSIMD context coordination helpers
4 *
5 * Copyright 2018 Arm Limited
6 * Author: Dave Martin <Dave.Martin@arm.com>
7 */
8#include <linux/irqflags.h>
9#include <linux/sched.h>
10#include <linux/thread_info.h>
11#include <linux/kvm_host.h>
12#include <asm/fpsimd.h>
13#include <asm/kvm_asm.h>
14#include <asm/kvm_hyp.h>
14#include <asm/kvm_mmu.h>
15#include <asm/sysreg.h>
16
17/*
18 * Called on entry to KVM_RUN unless this vcpu previously ran at least
19 * once and the most recent prior KVM_RUN for this vcpu was called from
20 * the same task as current (highly likely).
21 *

--- 85 unchanged lines hidden (view full) ---

107 bool guest_has_sve = vcpu_has_sve(vcpu);
108
109 local_irq_save(flags);
110
111 if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) {
112 fpsimd_save_and_flush_cpu_state();
113
114 if (guest_has_sve)
15#include <asm/kvm_mmu.h>
16#include <asm/sysreg.h>
17
18/*
19 * Called on entry to KVM_RUN unless this vcpu previously ran at least
20 * once and the most recent prior KVM_RUN for this vcpu was called from
21 * the same task as current (highly likely).
22 *

--- 85 unchanged lines hidden (view full) ---

108 bool guest_has_sve = vcpu_has_sve(vcpu);
109
110 local_irq_save(flags);
111
112 if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) {
113 fpsimd_save_and_flush_cpu_state();
114
115 if (guest_has_sve)
115 __vcpu_sys_reg(vcpu, ZCR_EL1) = read_sysreg_s(SYS_ZCR_EL12);
116 __vcpu_sys_reg(vcpu, ZCR_EL1) = read_sysreg_el1(SYS_ZCR);
116 } else if (host_has_sve) {
117 /*
118 * The FPSIMD/SVE state in the CPU has not been touched, and we
119 * have SVE (and VHE): CPACR_EL1 (alias CPTR_EL2) has been
120 * reset to CPACR_EL1_DEFAULT by the Hyp code, disabling SVE
121 * for EL0. To avoid spurious traps, restore the trap state
122 * seen by kvm_arch_vcpu_load_fp():
123 */
124 if (vcpu->arch.flags & KVM_ARM64_HOST_SVE_ENABLED)
125 sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_ZEN_EL0EN);
126 else
127 sysreg_clear_set(CPACR_EL1, CPACR_EL1_ZEN_EL0EN, 0);
128 }
129
130 update_thread_flag(TIF_SVE,
131 vcpu->arch.flags & KVM_ARM64_HOST_SVE_IN_USE);
132
133 local_irq_restore(flags);
134}
117 } else if (host_has_sve) {
118 /*
119 * The FPSIMD/SVE state in the CPU has not been touched, and we
120 * have SVE (and VHE): CPACR_EL1 (alias CPTR_EL2) has been
121 * reset to CPACR_EL1_DEFAULT by the Hyp code, disabling SVE
122 * for EL0. To avoid spurious traps, restore the trap state
123 * seen by kvm_arch_vcpu_load_fp():
124 */
125 if (vcpu->arch.flags & KVM_ARM64_HOST_SVE_ENABLED)
126 sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_ZEN_EL0EN);
127 else
128 sysreg_clear_set(CPACR_EL1, CPACR_EL1_ZEN_EL0EN, 0);
129 }
130
131 update_thread_flag(TIF_SVE,
132 vcpu->arch.flags & KVM_ARM64_HOST_SVE_IN_USE);
133
134 local_irq_restore(flags);
135}