This is a note to let you know that I've just added the patch titled
KVM: arm64: vgic: Add a non-locking primitive for kvm_vgic_vcpu_destroy()
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-arm64-vgic-add-a-non-locking-primitive-for-kvm_vgic_vcpu_destroy.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d26b9cb33c2d1ba68d1f26bb06c40300f16a3799 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@xxxxxxxxxx>
Date: Thu, 7 Dec 2023 15:11:58 +0000
Subject: KVM: arm64: vgic: Add a non-locking primitive for kvm_vgic_vcpu_destroy()
From: Marc Zyngier <maz@xxxxxxxxxx>
commit d26b9cb33c2d1ba68d1f26bb06c40300f16a3799 upstream.
As we are going to need to call into kvm_vgic_vcpu_destroy() without
prior holding of the slots_lock, introduce __kvm_vgic_vcpu_destroy()
as a non-locking primitive of kvm_vgic_vcpu_destroy().
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231207151201.3028710-3-maz@xxxxxxxxxx
Signed-off-by: Oliver Upton <oliver.upton@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kvm/vgic/vgic-init.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
--- a/arch/arm64/kvm/vgic/vgic-init.c
+++ b/arch/arm64/kvm/vgic/vgic-init.c
@@ -368,7 +368,7 @@ static void kvm_vgic_dist_destroy(struct
vgic_v4_teardown(kvm);
}
-void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
+static void __kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
@@ -382,6 +382,15 @@ void kvm_vgic_vcpu_destroy(struct kvm_vc
vgic_cpu->rd_iodev.base_addr = VGIC_ADDR_UNDEF;
}
+void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+
+ mutex_lock(&kvm->slots_lock);
+ __kvm_vgic_vcpu_destroy(vcpu);
+ mutex_unlock(&kvm->slots_lock);
+}
+
void kvm_vgic_destroy(struct kvm *kvm)
{
struct kvm_vcpu *vcpu;
@@ -392,7 +401,7 @@ void kvm_vgic_destroy(struct kvm *kvm)
vgic_debug_destroy(kvm);
kvm_for_each_vcpu(i, vcpu, kvm)
- kvm_vgic_vcpu_destroy(vcpu);
+ __kvm_vgic_vcpu_destroy(vcpu);
mutex_lock(&kvm->arch.config_lock);
Patches currently in stable-queue which might be from maz@xxxxxxxxxx are
queue-6.6/kvm-arm64-vgic-force-vcpu-vgic-teardown-on-vcpu-destroy.patch
queue-6.6/kvm-arm64-vgic-add-a-non-locking-primitive-for-kvm_vgic_vcpu_destroy.patch
queue-6.6/kvm-arm64-vgic-simplify-kvm_vgic_destroy.patch
