cregit-Linux how code gets into the kernel

Release 4.11 arch/arm64/kvm/hyp/tlb.c

/*
 * Copyright (C) 2015 - ARM Ltd
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <asm/kvm_hyp.h>
#include <asm/tlbflush.h>


static void __hyp_text __tlb_switch_to_guest_vhe(struct kvm *kvm) { u64 val; /* * With VHE enabled, we have HCR_EL2.{E2H,TGE} = {1,1}, and * most TLB operations target EL2/EL0. In order to affect the * guest TLBs (EL1/EL0), we need to change one of these two * bits. Changing E2H is impossible (goodbye TTBR1_EL2), so * let's flip TGE before executing the TLB operation. */ write_sysreg(kvm->arch.vttbr, vttbr_el2); val = read_sysreg(hcr_el2); val &= ~HCR_TGE; write_sysreg(val, hcr_el2); isb(); }

Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier49100.00%1100.00%
Total49100.00%1100.00%


static void __hyp_text __tlb_switch_to_guest_nvhe(struct kvm *kvm) { write_sysreg(kvm->arch.vttbr, vttbr_el2); isb(); }

Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier26100.00%1100.00%
Total26100.00%1100.00%

static hyp_alternate_select(__tlb_switch_to_guest, __tlb_switch_to_guest_nvhe, __tlb_switch_to_guest_vhe, ARM64_HAS_VIRT_HOST_EXTN);
static void __hyp_text __tlb_switch_to_host_vhe(struct kvm *kvm) { /* * We're done with the TLB operation, let's restore the host's * view of HCR_EL2. */ write_sysreg(0, vttbr_el2); write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2); }

Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier27100.00%1100.00%
Total27100.00%1100.00%


static void __hyp_text __tlb_switch_to_host_nvhe(struct kvm *kvm) { write_sysreg(0, vttbr_el2); }

Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier19100.00%1100.00%
Total19100.00%1100.00%

static hyp_alternate_select(__tlb_switch_to_host, __tlb_switch_to_host_nvhe, __tlb_switch_to_host_vhe, ARM64_HAS_VIRT_HOST_EXTN);
void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa) { dsb(ishst); /* Switch to requested VMID */ kvm = kern_hyp_va(kvm); __tlb_switch_to_guest()(kvm); /* * We could do so much better if we had the VA as well. * Instead, we invalidate Stage-2 for this IPA, and the * whole of Stage-1. Weep... */ ipa >>= 12; __tlbi(ipas2e1is, ipa); /* * We have to ensure completion of the invalidation at Stage-2, * since a table walk on another CPU could refill a TLB with a * complete (S1 + S2) walk based on the old Stage-2 mapping if * the Stage-1 invalidation happened first. */ dsb(ish); __tlbi(vmalle1is); dsb(ish); isb(); __tlb_switch_to_host()(kvm); }

Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier5781.43%250.00%
Christopher Covington1217.14%125.00%
Christoffer Dall11.43%125.00%
Total70100.00%4100.00%


void __hyp_text __kvm_tlb_flush_vmid(struct kvm *kvm) { dsb(ishst); /* Switch to requested VMID */ kvm = kern_hyp_va(kvm); __tlb_switch_to_guest()(kvm); __tlbi(vmalls12e1is); dsb(ish); isb(); __tlb_switch_to_host()(kvm); }

Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier4387.76%250.00%
Christopher Covington510.20%125.00%
Christoffer Dall12.04%125.00%
Total49100.00%4100.00%


void __hyp_text __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu) { struct kvm *kvm = kern_hyp_va(kern_hyp_va(vcpu)->kvm); /* Switch to requested VMID */ __tlb_switch_to_guest()(kvm); __tlbi(vmalle1); dsb(nsh); isb(); __tlb_switch_to_host()(kvm); }

Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier4790.38%266.67%
Christopher Covington59.62%133.33%
Total52100.00%3100.00%


void __hyp_text __kvm_flush_vm_context(void) { dsb(ishst); __tlbi(alle1is); asm volatile("ic ialluis" : : ); dsb(ish); }

Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier1973.08%133.33%
Christopher Covington623.08%133.33%
Christoffer Dall13.85%133.33%
Total26100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Marc Zyngier31590.26%466.67%
Christopher Covington318.88%116.67%
Christoffer Dall30.86%116.67%
Total349100.00%6100.00%
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