linux-kernel - [RFC kvmtool 14/31] arm64: Add configuration step for Realms

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Date:   Fri, 27 Jan 2023 11:39:15 +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 14/31] arm64: Add configuration step for Realms

Realm must be configured before it is created. Add the
step to specify the parameters for the Realm.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arm/aarch64/realm.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arm/aarch64/realm.c b/arm/aarch64/realm.c
index 3a4adb66..31543e55 100644
--- a/arm/aarch64/realm.c
+++ b/arm/aarch64/realm.c
@@ -2,6 +2,29 @@
 
 #include <asm/realm.h>
 
+
+static void realm_configure_hash_algo(struct kvm *kvm)
+{
+	struct kvm_cap_arm_rme_config_item hash_algo_cfg = {
+		.cfg	= KVM_CAP_ARM_RME_CFG_HASH_ALGO,
+		.hash_algo = kvm->arch.measurement_algo,
+	};
+
+	struct kvm_enable_cap rme_config = {
+		.cap = KVM_CAP_ARM_RME,
+		.args[0] = KVM_CAP_ARM_RME_CONFIG_REALM,
+		.args[1] = (u64)&hash_algo_cfg,
+	};
+
+	if (ioctl(kvm->vm_fd, KVM_ENABLE_CAP, &rme_config) < 0)
+		die_perror("KVM_CAP_RME(KVM_CAP_ARM_RME_CONFIG_REALM) hash_algo");
+}
+
+static void realm_configure_parameters(struct kvm *kvm)
+{
+	realm_configure_hash_algo(kvm);
+}
+
 void kvm_arm_realm_create_realm_descriptor(struct kvm *kvm)
 {
 	struct kvm_enable_cap rme_create_rd = {
@@ -9,6 +32,7 @@ void kvm_arm_realm_create_realm_descriptor(struct kvm *kvm)
 		.args[0] = KVM_CAP_ARM_RME_CREATE_RD,
 	};
 
+	realm_configure_parameters(kvm);
 	if (ioctl(kvm->vm_fd, KVM_ENABLE_CAP, &rme_create_rd) < 0)
 		die_perror("KVM_CAP_RME(KVM_CAP_ARM_RME_CREATE_RD)");
 }
-- 
2.34.1