From:   Suzuki K Poulose <suzuki.poulose@arm.com>
To:     kvm@vger.kernel.org, kvmarm@lists.linux.dev
Cc:     suzuki.poulose@arm.com,
        Alexandru Elisei <alexandru.elisei@arm.com>,
        Andrew Jones <andrew.jones@linux.dev>,
        Christoffer Dall <christoffer.dall@arm.com>,
        Fuad Tabba <tabba@google.com>,
        Jean-Philippe Brucker <jean-philippe@linaro.org>,
        Joey Gouly <Joey.Gouly@arm.com>, Marc Zyngier <maz@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Oliver Upton <oliver.upton@linux.dev>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Quentin Perret <qperret@google.com>,
        Steven Price <steven.price@arm.com>,
        Thomas Huth <thuth@redhat.com>, Will Deacon <will@kernel.org>,
        Zenghui Yu <yuzenghui@huawei.com>, linux-coco@lists.linux.dev,
        kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, Joey Gouly <joey.gouly@arm.com>
Subject: [RFC kvmtool 30/31] arm64: realm: inject an abort on an unhandled MMIO access
Date:   Fri, 27 Jan 2023 11:39:31 +0000
Message-Id: <20230127113932.166089-31-suzuki.poulose@arm.com>
In-Reply-To: <20230127113932.166089-1-suzuki.poulose@arm.com>
References: <20230127112248.136810-1-suzuki.poulose@arm.com>
 <20230127113932.166089-1-suzuki.poulose@arm.com>
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From: Joey Gouly <joey.gouly@arm.com>

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

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.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