KVM: fix error handling in svm_hardware_setup

rename svm_hardware_unsetup as svm_hardware_teardown, move
it before svm_hardware_setup, and call it to free all memory
if fail to setup in svm_hardware_setup, otherwise memory will
be leaked

remove __exit attribute for it since it is called in __init
function

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index ff02aeb..d9b5add 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1349,6 +1349,24 @@ static __init void svm_adjust_mmio_mask(void)
        kvm_mmu_set_mmio_spte_mask(mask, mask, PT_WRITABLE_MASK | PT_USER_MASK);
 }
 
+static void svm_hardware_teardown(void)
+{
+       int cpu;
+
+       if (svm_sev_enabled()) {
+               bitmap_free(sev_asid_bitmap);
+               bitmap_free(sev_reclaim_asid_bitmap);
+
+               sev_flush_asids();
+       }
+
+       for_each_possible_cpu(cpu)
+               svm_cpu_uninit(cpu);
+
+       __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
+       iopm_base = 0;
+}
+
 static __init int svm_hardware_setup(void)
 {
        int cpu;
@@ -1462,29 +1480,10 @@ static __init int svm_hardware_setup(void)
        return 0;
 
 err:
-       __free_pages(iopm_pages, IOPM_ALLOC_ORDER);
-       iopm_base = 0;
+       svm_hardware_teardown();
        return r;
 }
 
-static __exit void svm_hardware_unsetup(void)
-{
-       int cpu;
-
-       if (svm_sev_enabled()) {
-               bitmap_free(sev_asid_bitmap);
-               bitmap_free(sev_reclaim_asid_bitmap);
-
-               sev_flush_asids();
-       }
-
-       for_each_possible_cpu(cpu)
-               svm_cpu_uninit(cpu);
-
-       __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
-       iopm_base = 0;
-}
-
 static void init_seg(struct vmcb_seg *seg)
 {
        seg->selector = 0;
@@ -7385,7 +7384,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
        .cpu_has_kvm_support = has_svm,
        .disabled_by_bios = is_disabled,
        .hardware_setup = svm_hardware_setup,
-       .hardware_unsetup = svm_hardware_unsetup,
+       .hardware_unsetup = svm_hardware_teardown,
        .check_processor_compatibility = svm_check_processor_compat,
        .hardware_enable = svm_hardware_enable,
        .hardware_disable = svm_hardware_disable,