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-rw-r--r--arch/arm64/kvm/hyp/tlb.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/tlb.c b/arch/arm64/kvm/hyp/tlb.c
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+++ b/arch/arm64/kvm/hyp/tlb.c
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+/*
+ * 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 "hyp.h"
+
+static void __hyp_text __tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
+{
+ dsb(ishst);
+
+ /* Switch to requested VMID */
+ kvm = kern_hyp_va(kvm);
+ write_sysreg(kvm->arch.vttbr, vttbr_el2);
+ isb();
+
+ /*
+ * 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;
+ asm volatile("tlbi ipas2e1is, %0" : : "r" (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);
+ asm volatile("tlbi vmalle1is" : : );
+ dsb(ish);
+ isb();
+
+ write_sysreg(0, vttbr_el2);
+}
+
+__alias(__tlb_flush_vmid_ipa) void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm,
+ phys_addr_t ipa);
+
+static void __hyp_text __tlb_flush_vmid(struct kvm *kvm)
+{
+ dsb(ishst);
+
+ /* Switch to requested VMID */
+ kvm = kern_hyp_va(kvm);
+ write_sysreg(kvm->arch.vttbr, vttbr_el2);
+ isb();
+
+ asm volatile("tlbi vmalls12e1is" : : );
+ dsb(ish);
+ isb();
+
+ write_sysreg(0, vttbr_el2);
+}
+
+__alias(__tlb_flush_vmid) void __kvm_tlb_flush_vmid(struct kvm *kvm);
+
+static void __hyp_text __tlb_flush_vm_context(void)
+{
+ dsb(ishst);
+ asm volatile("tlbi alle1is \n"
+ "ic ialluis ": : );
+ dsb(ish);
+}
+
+__alias(__tlb_flush_vm_context) void __kvm_flush_vm_context(void);