linux-kernel - [PATCH 3/4] KVM: arm/arm64: Check for broadcast TLBI support

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Date:	Thu,  4 Aug 2016 11:15:16 +0200
From:	Matthias Brugger <mbrugger@...e.com>
To:	pbonzini@...hat.com, rkrcmar@...hat.com,
	christoffer.dall@...aro.org, marc.zyngier@....com,
	linux@...linux.org.uk, catalin.marinas@....com, will.deacon@....com
Cc:	suzuki.poulose@....com, james.morse@....com,
	david.daney@...ium.com, rrichter@...ium.com, agraf@...e.de,
	mbrugger@...e.com, mark.rutland@....com, lorenzo.pieralisi@....com,
	dave.long@...aro.org, ard.biesheuvel@...aro.org,
	zlim.lnx@...il.com, kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] KVM: arm/arm64: Check for broadcast TLBI support

KVM awaits a working broadcast TLBI implementation.
Error out early when this is not provided by the
hardware.

Signed-off-by: Matthias Brugger <mbrugger@...e.com>
---
 arch/arm/kvm/arm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index f1bde7c..e627fac 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -1376,6 +1376,11 @@ int kvm_arch_init(void *opaque)
 	int err;
 	int ret, cpu;
 
+	if (cpus_have_cap(ARM64_HAS_NO_BCAST_TLBI)) {
+		kvm_err("Missing broadcast TLBI support.\n");
+		return -ENODEV;
+	}
+
 	if (!is_hyp_mode_available()) {
 		kvm_err("HYP mode not available\n");
 		return -ENODEV;
-- 
2.6.6