linux-kernel - [PATCH kvmtool v4 08/15] arm64: Add support for finding vCPU for given MPIDR

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250930103130.197534-10-suzuki.poulose@arm.com>
Date: Tue, 30 Sep 2025 11:31:23 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: kvmarm@...ts.linux.dev
Cc: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	will@...nel.org,
	oliver.upton@...ux.dev,
	maz@...nel.org,
	alexandru.elisei@....com,
	aneesh.kumar@...nel.org,
	steven.price@....com,
	tabba@...gle.com,
	Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH kvmtool v4 08/15] arm64: Add support for finding vCPU for given MPIDR

From: Oliver Upton <oliver.upton@...ux.dev>

Some PSCI calls take an MPIDR affinity as an argument. Add a helper to
get the vCPU that matches an MPIDR so we can find the intended
recipient.

Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arm64/include/kvm/kvm-arch.h |  2 ++
 arm64/kvm.c                  | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/arm64/include/kvm/kvm-arch.h b/arm64/include/kvm/kvm-arch.h
index 8f508ef8..a50e6a4f 100644
--- a/arm64/include/kvm/kvm-arch.h
+++ b/arm64/include/kvm/kvm-arch.h
@@ -114,4 +114,6 @@ struct kvm_arch {
 	cpu_set_t *vcpu_affinity_cpuset;
 };
 
+struct kvm_cpu *kvm__arch_mpidr_to_vcpu(struct kvm *kvm, u64 target_mpidr);
+
 #endif /* ARM_COMMON__KVM_ARCH_H */
diff --git a/arm64/kvm.c b/arm64/kvm.c
index 23b4dab1..41c47b13 100644
--- a/arm64/kvm.c
+++ b/arm64/kvm.c
@@ -5,6 +5,7 @@
 #include "kvm/virtio-console.h"
 #include "kvm/fdt.h"
 #include "kvm/gic.h"
+#include "kvm/kvm-cpu.h"
 
 #include <linux/byteorder.h>
 #include <linux/cpumask.h>
@@ -128,6 +129,22 @@ void kvm__arch_init(struct kvm *kvm)
 	kvm__arch_enable_mte(kvm);
 }
 
+
+struct kvm_cpu *kvm__arch_mpidr_to_vcpu(struct kvm *kvm, u64 target_mpidr)
+{
+	int i;
+
+	for (i = 0; i < kvm->nrcpus; i++) {
+		struct kvm_cpu *tmp = kvm->cpus[i];
+		u64 mpidr = kvm_cpu__get_vcpu_mpidr(tmp) & ARM_MPIDR_HWID_BITMASK;
+
+		if (mpidr == target_mpidr)
+			return tmp;
+	}
+
+	return NULL;
+}
+
 static u64 kvm__arch_get_payload_region_size(struct kvm *kvm)
 {
 	if (kvm->cfg.arch.aarch32_guest)
-- 
2.43.0