Commit dfdc0a71 authored by Wanpeng Li's avatar Wanpeng Li Committed by Paolo Bonzini
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KVM: X86: Fix x86_emulator slab cache leak 



Commit c9b8b07c (KVM: x86: Dynamically allocate per-vCPU emulation context)
tries to allocate per-vCPU emulation context dynamically, however, the
x86_emulator slab cache is still exiting after the kvm module is unload
as below after destroying the VM and unloading the kvm module.

grep x86_emulator /proc/slabinfo
x86_emulator          36     36   2672   12    8 : tunables    0    0    0 : slabdata      3      3      0

This patch fixes this slab cache leak by destroying the x86_emulator slab cache
when the kvm module is unloaded.

Fixes: c9b8b07c (KVM: x86: Dynamically allocate per-vCPU emulation context)
Cc: stable@vger.kernel.org
Signed-off-by: default avatarWanpeng Li <wanpengli@tencent.com>
Message-Id: <1623387573-5969-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 934002cd

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -8261,6 +8261,7 @@ void kvm_arch_exit(void) 
	kvm_x86_ops.hardware_enable = NULL;

	kvm_mmu_module_exit();

	free_percpu(user_return_msrs);

	kmem_cache_destroy(x86_emulator_cache);

	kmem_cache_destroy(x86_fpu_cache);

#ifdef CONFIG_KVM_XEN

	static_key_deferred_flush(&kvm_xen_enabled);