diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/tlb.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/tlb.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/arch/arm64/kvm/hyp/tlb.c b/arch/arm64/kvm/hyp/tlb.c deleted file mode 100644 index 73464a96c365..000000000000 --- a/arch/arm64/kvm/hyp/tlb.c +++ /dev/null @@ -1,157 +0,0 @@ -/* - * 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(); -} - -static void __hyp_text __tlb_switch_to_guest_nvhe(struct kvm *kvm) -{ - write_sysreg(kvm->arch.vttbr, vttbr_el2); - isb(); -} - -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); -} - -static void __hyp_text __tlb_switch_to_host_nvhe(struct kvm *kvm) -{ - write_sysreg(0, vttbr_el2); -} - -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(); - - /* - * If the host is running at EL1 and we have a VPIPT I-cache, - * then we must perform I-cache maintenance at EL2 in order for - * it to have an effect on the guest. Since the guest cannot hit - * I-cache lines allocated with a different VMID, we don't need - * to worry about junk out of guest reset (we nuke the I-cache on - * VMID rollover), but we do need to be careful when remapping - * executable pages for the same guest. This can happen when KSM - * takes a CoW fault on an executable page, copies the page into - * a page that was previously mapped in the guest and then needs - * to invalidate the guest view of the I-cache for that page - * from EL1. To solve this, we invalidate the entire I-cache when - * unmapping a page from a guest if we have a VPIPT I-cache but - * the host is running at EL1. As above, we could do better if - * we had the VA. - * - * The moral of this story is: if you have a VPIPT I-cache, then - * you should be running with VHE enabled. - */ - if (!has_vhe() && icache_is_vpipt()) - __flush_icache_all(); - - __tlb_switch_to_host()(kvm); -} - -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); -} - -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); -} - -void __hyp_text __kvm_flush_vm_context(void) -{ - dsb(ishst); - __tlbi(alle1is); - asm volatile("ic ialluis" : : ); - dsb(ish); -} |