linux-kernel - [RFC 48/55] KVM: arm64: Emulate TLBI instruction

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Date:   Mon,  9 Jan 2017 01:24:44 -0500
From:   Jintack Lim <jintack@...columbia.edu>
To:     christoffer.dall@...aro.org, marc.zyngier@....com,
        pbonzini@...hat.com, rkrcmar@...hat.com, linux@...linux.org.uk,
        catalin.marinas@....com, will.deacon@....com,
        vladimir.murzin@....com, suzuki.poulose@....com,
        mark.rutland@....com, james.morse@....com,
        lorenzo.pieralisi@....com, kevin.brodsky@....com,
        wcohen@...hat.com, shankerd@...eaurora.org, geoff@...radead.org,
        andre.przywara@....com, eric.auger@...hat.com,
        anna-maria@...utronix.de, shihwei@...columbia.edu,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jintack@...columbia.edu
Subject: [RFC 48/55] KVM: arm64: Emulate TLBI instruction

From: Christoffer Dall <christoffer.dall@...aro.org>

Currently, we flush ALL shadow stage-2 page tables on the tlbi
instruction execution. We may be able to do this more efficiently by
considering the vttbr_el2 value of the guest hypervisor, but leave it
for now.

Signed-off-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Jintack Lim <jintack@...columbia.edu>
---
 arch/arm64/kvm/sys_regs.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index ddb641c..b0a057d 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2013,8 +2013,14 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu,
 static int emulate_tlbi(struct kvm_vcpu *vcpu,
 			     struct sys_reg_params *params)
 {
-	/* TODO: support tlbi instruction emulation*/
-	kvm_inject_undefined(vcpu);
+	/*
+	 * We unmap ALL stage-2 page tables on tlbi instruction.
+	 * We may make it more efficient by looking at the exact tlbi
+	 * instruction.
+	 */
+	stage2_unmap_vm(vcpu->kvm);
+	kvm_nested_s2_unmap(vcpu);
+
 	return 1;
 }
 
-- 
1.9.1