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Commit 1d58d2cb authored by Marc Zyngier's avatar Marc Zyngier
Browse files

ARM: KVM: Add TLB invalidation code 



Convert the TLB invalidation code to C, hooking it into the
build system whilst we're at it.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 3c295687

arch/arm/kvm/Makefile

+1 −0
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@@ -17,6 +17,7 @@ AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt) 
KVM := ../../../virt/kvm

kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o



obj-$(CONFIG_KVM_ARM_HOST) += hyp/

obj-y += kvm-arm.o init.o interrupts.o

obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o

obj-y += coproc.o coproc_a15.o coproc_a7.o mmio.o psci.o perf.o

arch/arm/kvm/hyp/Makefile

0 → 100644
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#

# Makefile for Kernel-based Virtual Machine module, HYP part

#



obj-$(CONFIG_KVM_ARM_HOST) += tlb.o

arch/arm/kvm/hyp/hyp.h

+5 −0
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@@ -42,4 +42,9 @@ 
})

#define read_sysreg(...)		__read_sysreg(__VA_ARGS__)



#define VTTBR		__ACCESS_CP15_64(6, c2)

#define ICIALLUIS	__ACCESS_CP15(c7, 0, c1, 0)

#define TLBIALLIS	__ACCESS_CP15(c8, 0, c3, 0)

#define TLBIALLNSNHIS	__ACCESS_CP15(c8, 4, c3, 4)



#endif /* __ARM_KVM_HYP_H__ */

arch/arm/kvm/hyp/tlb.c

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Original line number Diff line number Diff line 
/*

 * 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 "hyp.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.

 */

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);

	isb();



	write_sysreg(0, TLBIALLIS);

	dsb(ish);

	isb();



	write_sysreg(0, VTTBR);

}



__alias(__tlb_flush_vmid) void __weak __kvm_tlb_flush_vmid(struct kvm *kvm);



static void __hyp_text __tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)

{

	__tlb_flush_vmid(kvm);

}



__alias(__tlb_flush_vmid_ipa) void __weak __kvm_tlb_flush_vmid_ipa(struct kvm *kvm,

							    phys_addr_t ipa);



static void __hyp_text __tlb_flush_vm_context(void)

{

	write_sysreg(0, TLBIALLNSNHIS);

	write_sysreg(0, ICIALLUIS);

	dsb(ish);

}



__alias(__tlb_flush_vm_context) void __weak __kvm_flush_vm_context(void);