diff options
| -rw-r--r-- | arch/arm64/kvm/hyp/switch.c | 104 |
1 files changed, 57 insertions, 47 deletions
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index 35f3bbe17084..b055111df1a1 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -291,53 +291,27 @@ static bool __hyp_text __skip_instr(struct kvm_vcpu *vcpu) } } -int __hyp_text __kvm_vcpu_run(struct kvm_vcpu *vcpu) +/* + * Return true when we were able to fixup the guest exit and should return to + * the guest, false when we should restore the host state and return to the + * main run loop. + */ +static bool __hyp_text fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code) { - struct kvm_cpu_context *host_ctxt; - struct kvm_cpu_context *guest_ctxt; - bool fp_enabled; - u64 exit_code; - - vcpu = kern_hyp_va(vcpu); - - host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context); - host_ctxt->__hyp_running_vcpu = vcpu; - guest_ctxt = &vcpu->arch.ctxt; - - __sysreg_save_host_state(host_ctxt); - - __activate_traps(vcpu); - __activate_vm(vcpu); - - __vgic_restore_state(vcpu); - __timer_enable_traps(vcpu); - - /* - * We must restore the 32-bit state before the sysregs, thanks - * to erratum #852523 (Cortex-A57) or #853709 (Cortex-A72). - */ - __sysreg32_restore_state(vcpu); - __sysreg_restore_guest_state(guest_ctxt); - __debug_switch_to_guest(vcpu); - - /* Jump in the fire! */ -again: - exit_code = __guest_enter(vcpu, host_ctxt); - /* And we're baaack! */ - - if (ARM_EXCEPTION_CODE(exit_code) != ARM_EXCEPTION_IRQ) + if (ARM_EXCEPTION_CODE(*exit_code) != ARM_EXCEPTION_IRQ) vcpu->arch.fault.esr_el2 = read_sysreg_el2(esr); + /* * We're using the raw exception code in order to only process * the trap if no SError is pending. We will come back to the * same PC once the SError has been injected, and replay the * trapping instruction. */ - if (exit_code == ARM_EXCEPTION_TRAP && !__populate_fault_info(vcpu)) - goto again; + if (*exit_code == ARM_EXCEPTION_TRAP && !__populate_fault_info(vcpu)) + return true; if (static_branch_unlikely(&vgic_v2_cpuif_trap) && - exit_code == ARM_EXCEPTION_TRAP) { + *exit_code == ARM_EXCEPTION_TRAP) { bool valid; valid = kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_DABT_LOW && @@ -351,9 +325,9 @@ again: if (ret == 1) { if (__skip_instr(vcpu)) - goto again; + return true; else - exit_code = ARM_EXCEPTION_TRAP; + *exit_code = ARM_EXCEPTION_TRAP; } if (ret == -1) { @@ -365,29 +339,65 @@ again: */ if (!__skip_instr(vcpu)) *vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS; - exit_code = ARM_EXCEPTION_EL1_SERROR; + *exit_code = ARM_EXCEPTION_EL1_SERROR; } - - /* 0 falls through to be handler out of EL2 */ } } if (static_branch_unlikely(&vgic_v3_cpuif_trap) && - exit_code == ARM_EXCEPTION_TRAP && + *exit_code == ARM_EXCEPTION_TRAP && (kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_SYS64 || kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_CP15_32)) { int ret = __vgic_v3_perform_cpuif_access(vcpu); if (ret == 1) { if (__skip_instr(vcpu)) - goto again; + return true; else - exit_code = ARM_EXCEPTION_TRAP; + *exit_code = ARM_EXCEPTION_TRAP; } - - /* 0 falls through to be handled out of EL2 */ } + /* Return to the host kernel and handle the exit */ + return false; +} + +int __hyp_text __kvm_vcpu_run(struct kvm_vcpu *vcpu) +{ + struct kvm_cpu_context *host_ctxt; + struct kvm_cpu_context *guest_ctxt; + bool fp_enabled; + u64 exit_code; + + vcpu = kern_hyp_va(vcpu); + + host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context); + host_ctxt->__hyp_running_vcpu = vcpu; + guest_ctxt = &vcpu->arch.ctxt; + + __sysreg_save_host_state(host_ctxt); + + __activate_traps(vcpu); + __activate_vm(vcpu); + + __vgic_restore_state(vcpu); + __timer_enable_traps(vcpu); + + /* + * We must restore the 32-bit state before the sysregs, thanks + * to erratum #852523 (Cortex-A57) or #853709 (Cortex-A72). + */ + __sysreg32_restore_state(vcpu); + __sysreg_restore_guest_state(guest_ctxt); + __debug_switch_to_guest(vcpu); + + do { + /* Jump in the fire! */ + exit_code = __guest_enter(vcpu, host_ctxt); + + /* And we're baaack! */ + } while (fixup_guest_exit(vcpu, &exit_code)); + if (cpus_have_const_cap(ARM64_HARDEN_BP_POST_GUEST_EXIT)) { u32 midr = read_cpuid_id(); |