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2d0e63e030
We can finally get completely rid of any calls to the VGICv3 save/restore functions when the AP lists are empty on VHE systems. This requires carefully factoring out trap configuration from saving and restoring state, and carefully choosing what to do on the VHE and non-VHE path. One of the challenges is that we cannot save/restore the VMCR lazily because we can only write the VMCR when ICC_SRE_EL1.SRE is cleared when emulating a GICv2-on-GICv3, since otherwise all Group-0 interrupts end up being delivered as FIQ. To solve this problem, and still provide fast performance in the fast path of exiting a VM when no interrupts are pending (which also optimized the latency for actually delivering virtual interrupts coming from physical interrupts), we orchestrate a dance of only doing the activate/deactivate traps in vgic load/put for VHE systems (which can have ICC_SRE_EL1.SRE cleared when running in the host), and doing the configuration on every round-trip on non-VHE systems. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
160 lines
5.8 KiB
C
160 lines
5.8 KiB
C
/*
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* Copyright (C) 2015 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ARM64_KVM_HYP_H__
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#define __ARM64_KVM_HYP_H__
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#include <linux/compiler.h>
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#include <linux/kvm_host.h>
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#include <asm/sysreg.h>
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#define __hyp_text __section(.hyp.text) notrace
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#define read_sysreg_elx(r,nvh,vh) \
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({ \
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u64 reg; \
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asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\
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"mrs_s %0, " __stringify(r##vh),\
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ARM64_HAS_VIRT_HOST_EXTN) \
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: "=r" (reg)); \
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reg; \
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})
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#define write_sysreg_elx(v,r,nvh,vh) \
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do { \
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u64 __val = (u64)(v); \
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asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\
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"msr_s " __stringify(r##vh) ", %x0",\
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ARM64_HAS_VIRT_HOST_EXTN) \
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: : "rZ" (__val)); \
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} while (0)
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/*
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* Unified accessors for registers that have a different encoding
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* between VHE and non-VHE. They must be specified without their "ELx"
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* encoding.
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*/
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#define read_sysreg_el2(r) \
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({ \
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u64 reg; \
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asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\
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"mrs %0, " __stringify(r##_EL1),\
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ARM64_HAS_VIRT_HOST_EXTN) \
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: "=r" (reg)); \
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reg; \
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})
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#define write_sysreg_el2(v,r) \
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do { \
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u64 __val = (u64)(v); \
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asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\
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"msr " __stringify(r##_EL1) ", %x0",\
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ARM64_HAS_VIRT_HOST_EXTN) \
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: : "rZ" (__val)); \
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} while (0)
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#define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02)
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#define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02)
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#define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12)
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#define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
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/* The VHE specific system registers and their encoding */
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#define sctlr_EL12 sys_reg(3, 5, 1, 0, 0)
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#define cpacr_EL12 sys_reg(3, 5, 1, 0, 2)
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#define ttbr0_EL12 sys_reg(3, 5, 2, 0, 0)
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#define ttbr1_EL12 sys_reg(3, 5, 2, 0, 1)
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#define tcr_EL12 sys_reg(3, 5, 2, 0, 2)
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#define afsr0_EL12 sys_reg(3, 5, 5, 1, 0)
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#define afsr1_EL12 sys_reg(3, 5, 5, 1, 1)
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#define esr_EL12 sys_reg(3, 5, 5, 2, 0)
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#define far_EL12 sys_reg(3, 5, 6, 0, 0)
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#define mair_EL12 sys_reg(3, 5, 10, 2, 0)
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#define amair_EL12 sys_reg(3, 5, 10, 3, 0)
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#define vbar_EL12 sys_reg(3, 5, 12, 0, 0)
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#define contextidr_EL12 sys_reg(3, 5, 13, 0, 1)
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#define cntkctl_EL12 sys_reg(3, 5, 14, 1, 0)
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#define cntp_tval_EL02 sys_reg(3, 5, 14, 2, 0)
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#define cntp_ctl_EL02 sys_reg(3, 5, 14, 2, 1)
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#define cntp_cval_EL02 sys_reg(3, 5, 14, 2, 2)
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#define cntv_tval_EL02 sys_reg(3, 5, 14, 3, 0)
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#define cntv_ctl_EL02 sys_reg(3, 5, 14, 3, 1)
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#define cntv_cval_EL02 sys_reg(3, 5, 14, 3, 2)
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#define spsr_EL12 sys_reg(3, 5, 4, 0, 0)
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#define elr_EL12 sys_reg(3, 5, 4, 0, 1)
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/**
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* hyp_alternate_select - Generates patchable code sequences that are
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* used to switch between two implementations of a function, depending
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* on the availability of a feature.
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*
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* @fname: a symbol name that will be defined as a function returning a
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* function pointer whose type will match @orig and @alt
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* @orig: A pointer to the default function, as returned by @fname when
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* @cond doesn't hold
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* @alt: A pointer to the alternate function, as returned by @fname
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* when @cond holds
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* @cond: a CPU feature (as described in asm/cpufeature.h)
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*/
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#define hyp_alternate_select(fname, orig, alt, cond) \
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typeof(orig) * __hyp_text fname(void) \
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{ \
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typeof(alt) *val = orig; \
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asm volatile(ALTERNATIVE("nop \n", \
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"mov %0, %1 \n", \
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cond) \
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: "+r" (val) : "r" (alt)); \
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return val; \
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}
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int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
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void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
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void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
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void __vgic_v3_activate_traps(struct kvm_vcpu *vcpu);
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void __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu);
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void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu);
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void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu);
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int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
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void __timer_enable_traps(struct kvm_vcpu *vcpu);
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void __timer_disable_traps(struct kvm_vcpu *vcpu);
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void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
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void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
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void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
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void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
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void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
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void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
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void __sysreg32_save_state(struct kvm_vcpu *vcpu);
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void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
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void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
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void __debug_switch_to_host(struct kvm_vcpu *vcpu);
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void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
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void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
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bool __fpsimd_enabled(void);
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void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
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void deactivate_traps_vhe_put(void);
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u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
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void __noreturn __hyp_do_panic(unsigned long, ...);
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#endif /* __ARM64_KVM_HYP_H__ */
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