linux-kernel - [RFC kvmtool 30/31] arm64: realm: inject an abort on an unhandled MMIO access

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Message-Id: <20230127113932.166089-31-suzuki.poulose@arm.com>
Date:   Fri, 27 Jan 2023 11:39:31 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     kvm@...r.kernel.org, kvmarm@...ts.linux.dev
Cc:     suzuki.poulose@....com,
        Alexandru Elisei <alexandru.elisei@....com>,
        Andrew Jones <andrew.jones@...ux.dev>,
        Christoffer Dall <christoffer.dall@....com>,
        Fuad Tabba <tabba@...gle.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Joey Gouly <Joey.Gouly@....com>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Quentin Perret <qperret@...gle.com>,
        Steven Price <steven.price@....com>,
        Thomas Huth <thuth@...hat.com>, Will Deacon <will@...nel.org>,
        Zenghui Yu <yuzenghui@...wei.com>, linux-coco@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Joey Gouly <joey.gouly@....com>
Subject: [RFC kvmtool 30/31] arm64: realm: inject an abort on an unhandled MMIO access

From: Joey Gouly <joey.gouly@....com>

For Realms, inject a synchronous external abort, instead of ignoring unknown
MMIO accesses.

Signed-off-by: Joey Gouly <joey.gouly@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arm/kvm-cpu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arm/kvm-cpu.c b/arm/kvm-cpu.c
index 90a15ae9..c96d75eb 100644
--- a/arm/kvm-cpu.c
+++ b/arm/kvm-cpu.c
@@ -155,4 +155,13 @@ void kvm_cpu__show_page_tables(struct kvm_cpu *vcpu)
 
 void kvm_cpu__arch_unhandled_mmio(struct kvm_cpu *vcpu)
 {
+	struct kvm_vcpu_events events = { };
+
+	if (!vcpu->kvm->cfg.arch.is_realm)
+		return;
+
+	events.exception.ext_dabt_pending = 1;
+
+	if (ioctl(vcpu->vcpu_fd, KVM_SET_VCPU_EVENTS, &events) < 0)
+		die_perror("KVM_SET_VCPU_EVENTS failed");
 }
-- 
2.34.1