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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2015 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/
#ifndef __ARM64_KVM_HYP_H__
#define __ARM64_KVM_HYP_H__
#include <linux/compiler.h>
#include <linux/kvm_host.h>
#include <asm/alternative.h>
#include <asm/kvm_mmu.h>
#include <asm/sysreg.h>
#define __hyp_text __section(.hyp.text) notrace
#define read_sysreg_elx(r,nvh,vh) \
({ \
u64 reg; \
asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \
__mrs_s("%0", r##vh), \
ARM64_HAS_VIRT_HOST_EXTN) \
: "=r" (reg)); \
reg; \
})
#define write_sysreg_elx(v,r,nvh,vh) \
do { \
u64 __val = (u64)(v); \
asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \
__msr_s(r##vh, "%x0"), \
ARM64_HAS_VIRT_HOST_EXTN) \
: : "rZ" (__val)); \
} while (0)
/*
* Unified accessors for registers that have a different encoding
* between VHE and non-VHE. They must be specified without their "ELx"
* encoding, but with the SYS_ prefix, as defined in asm/sysreg.h.
*/
#define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02)
#define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02)
#define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12)
#define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
#define read_sysreg_el2(r) read_sysreg_elx(r, _EL2, _EL1)
#define write_sysreg_el2(v,r) write_sysreg_elx(v, r, _EL2, _EL1)
/**
* hyp_alternate_select - Generates patchable code sequences that are
* used to switch between two implementations of a function, depending
* on the availability of a feature.
*
* @fname: a symbol name that will be defined as a function returning a
* function pointer whose type will match @orig and @alt
* @orig: A pointer to the default function, as returned by @fname when
* @cond doesn't hold
* @alt: A pointer to the alternate function, as returned by @fname
* when @cond holds
* @cond: a CPU feature (as described in asm/cpufeature.h)
*/
#define hyp_alternate_select(fname, orig, alt, cond) \
typeof(orig) * __hyp_text fname(void) \
{ \
typeof(alt) *val = orig; \
asm volatile(ALTERNATIVE("nop \n", \
"mov %0, %1 \n", \
cond) \
: "+r" (val) : "r" (alt)); \
return val; \
}
int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
void __vgic_v3_activate_traps(struct kvm_vcpu *vcpu);
void __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu);
void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu);
void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu);
int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
void __timer_enable_traps(struct kvm_vcpu *vcpu);
void __timer_disable_traps(struct kvm_vcpu *vcpu);
void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
void __sysreg32_save_state(struct kvm_vcpu *vcpu);
void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
void __debug_switch_to_host(struct kvm_vcpu *vcpu);
void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
void deactivate_traps_vhe_put(void);
u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
void __noreturn __hyp_do_panic(unsigned long, ...);
/*
* Must be called from hyp code running at EL2 with an updated VTTBR
* and interrupts disabled.
*/
static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm)
{
write_sysreg(kvm->arch.vtcr, vtcr_el2);
write_sysreg(kvm_get_vttbr(kvm), vttbr_el2);
/*
* ARM erratum 1165522 requires the actual execution of the above
* before we can switch to the EL1/EL0 translation regime used by
* the guest.
*/
asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_1165522));
}
#endif /* __ARM64_KVM_HYP_H__ */
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