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    Subject[PATCH 5.12 136/178] KVM: X86: Fix x86_emulator slab cache leak
    Date
    From: Wanpeng Li <wanpengli@tencent.com>

    commit dfdc0a714d241bfbf951886c373cd1ae463fcc25 upstream.

    Commit c9b8b07cded58 (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: c9b8b07cded58 (KVM: x86: Dynamically allocate per-vCPU emulation context)
    Cc: stable@vger.kernel.org
    Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
    Message-Id: <1623387573-5969-1-git-send-email-wanpengli@tencent.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/x86/kvm/x86.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -8150,6 +8150,7 @@ 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);

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