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/*
* Original code:
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
* Author: Christoffer Dall <c.dall@virtualopensystems.com>
*
* Mostly rewritten in C by 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/kvm_mmu.h>
/**
* Flush per-VMID TLBs
*
* __kvm_tlb_flush_vmid(struct kvm *kvm);
*
* We rely on the hardware to broadcast the TLB invalidation to all CPUs
* inside the inner-shareable domain (which is the case for all v7
* implementations). If we come across a non-IS SMP implementation, we'll
* have to use an IPI based mechanism. Until then, we stick to the simple
* hardware assisted version.
*
* As v7 does not support flushing per IPA, just nuke the whole TLB
* instead, ignoring the ipa value.
*/
void __hyp_text __kvm_tlb_flush_vmid(struct kvm *kvm)
{
dsb(ishst);
/* Switch to requested VMID */
kvm = kern_hyp_va(kvm);
write_sysreg(kvm_get_vttbr(kvm), VTTBR);
isb();
write_sysreg(0, TLBIALLIS);
dsb(ish);
isb();
write_sysreg(0, VTTBR);
}
void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
{
__kvm_tlb_flush_vmid(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 */
write_sysreg(kvm_get_vttbr(kvm), VTTBR);
isb();
write_sysreg(0, TLBIALL);
dsb(nsh);
isb();
write_sysreg(0, VTTBR);
}
void __hyp_text __kvm_flush_vm_context(void)
{
write_sysreg(0, TLBIALLNSNHIS);
write_sysreg(0, ICIALLUIS);
dsb(ish);
}
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