lkml.org 
[lkml]   [2019]   [Dec]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 44/45] KVM: Move putting of vcpu->pid to kvm_vcpu_destroy()
Date
Move the putting of vcpu->pid to kvm_vcpu_destroy().  vcpu->pid is
guaranteed to be NULL when kvm_vcpu_uninit() is called in the error path
of kvm_vm_ioctl_create_vcpu(), e.g. it is explicitly nullified by
kvm_vcpu_init() and is only changed by KVM_RUN.

No functional change intended.

Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
virt/kvm/kvm_main.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 21533a472ead..6912d81ca32d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -352,12 +352,6 @@ static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)

static void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
{
- /*
- * no need for rcu_read_lock as VCPU_RUN is the only place that
- * will change the vcpu->pid pointer and on uninit all file
- * descriptors are already gone.
- */
- put_pid(rcu_dereference_protected(vcpu->pid, 1));
free_page((unsigned long)vcpu->run);
}

@@ -365,6 +359,13 @@ void kvm_vcpu_destroy(struct kvm_vcpu *vcpu)
{
kvm_arch_vcpu_destroy(vcpu);

+ /*
+ * No need for rcu_read_lock as VCPU_RUN is the only place that changes
+ * the vcpu->pid pointer, and at destruction time all file descriptors
+ * are already gone.
+ */
+ put_pid(rcu_dereference_protected(vcpu->pid, 1));
+
kvm_vcpu_uninit(vcpu);
kmem_cache_free(kvm_vcpu_cache, vcpu);
}
--
2.24.1
\
 
 \ /
  Last update: 2019-12-18 22:56    [W:0.180 / U:0.484 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site