linux-kernel - [RFC kvmtool 12/31] arm64: Create Realm Descriptor

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Date:   Fri, 27 Jan 2023 11:39:13 +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
Subject: [RFC kvmtool 12/31] arm64: Create Realm Descriptor

From: Alexandru Elisei <alexandru.elisei@....com>

Create the Realm Descriptor using the measurement algorithm set
with --measurement-algo.

Signed-off-by: Alexandru Elisei <alexandru.elisei@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 Makefile                        |  1 +
 arm/aarch32/include/asm/realm.h | 10 ++++++++++
 arm/aarch64/include/asm/realm.h | 10 ++++++++++
 arm/aarch64/realm.c             | 14 ++++++++++++++
 arm/kvm.c                       |  3 +++
 5 files changed, 38 insertions(+)
 create mode 100644 arm/aarch32/include/asm/realm.h
 create mode 100644 arm/aarch64/include/asm/realm.h
 create mode 100644 arm/aarch64/realm.c

diff --git a/Makefile b/Makefile
index ed2414bd..88cdf6d2 100644
--- a/Makefile
+++ b/Makefile
@@ -192,6 +192,7 @@ ifeq ($(ARCH), arm64)
 	OBJS		+= arm/aarch64/kvm.o
 	OBJS		+= arm/aarch64/pvtime.o
 	OBJS		+= arm/aarch64/pmu.o
+	OBJS		+= arm/aarch64/realm.o
 	ARCH_INCLUDE	:= $(HDRS_ARM_COMMON)
 	ARCH_INCLUDE	+= -Iarm/aarch64/include
 
diff --git a/arm/aarch32/include/asm/realm.h b/arm/aarch32/include/asm/realm.h
new file mode 100644
index 00000000..5aca6cca
--- /dev/null
+++ b/arm/aarch32/include/asm/realm.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_REALM_H
+#define __ASM_REALM_H
+
+#include "kvm/kvm.h"
+
+static inline void kvm_arm_realm_create_realm_descriptor(struct kvm *kvm) {}
+
+#endif /* ! __ASM_REALM_H */
diff --git a/arm/aarch64/include/asm/realm.h b/arm/aarch64/include/asm/realm.h
new file mode 100644
index 00000000..e176f15f
--- /dev/null
+++ b/arm/aarch64/include/asm/realm.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_REALM_H
+#define __ASM_REALM_H
+
+#include "kvm/kvm.h"
+
+void kvm_arm_realm_create_realm_descriptor(struct kvm *kvm);
+
+#endif /* ! __ASM_REALM_H */
diff --git a/arm/aarch64/realm.c b/arm/aarch64/realm.c
new file mode 100644
index 00000000..3a4adb66
--- /dev/null
+++ b/arm/aarch64/realm.c
@@ -0,0 +1,14 @@
+#include "kvm/kvm.h"
+
+#include <asm/realm.h>
+
+void kvm_arm_realm_create_realm_descriptor(struct kvm *kvm)
+{
+	struct kvm_enable_cap rme_create_rd = {
+		.cap = KVM_CAP_ARM_RME,
+		.args[0] = KVM_CAP_ARM_RME_CREATE_RD,
+	};
+
+	if (ioctl(kvm->vm_fd, KVM_ENABLE_CAP, &rme_create_rd) < 0)
+		die_perror("KVM_CAP_RME(KVM_CAP_ARM_RME_CREATE_RD)");
+}
diff --git a/arm/kvm.c b/arm/kvm.c
index 0e40b753..2510a322 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -127,6 +127,9 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
 
 void kvm__arch_init(struct kvm *kvm)
 {
+	if (kvm->cfg.arch.is_realm)
+		kvm_arm_realm_create_realm_descriptor(kvm);
+
 	/* Create the virtual GIC. */
 	if (gic__create(kvm, kvm->cfg.arch.irqchip))
 		die("Failed to create virtual GIC");
-- 
2.34.1