kvm: vmx: fix oops with explicit flexpriority=0 option

A function pointer was not NULLed, causing kvm_vcpu_reload_apic_access_page to
go down the wrong path and OOPS when doing put_page(NULL).

This did not happen on old processors, only when setting the module option
explicitly.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index de5ce82..81152a0 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5879,16 +5879,16 @@ static __init int hardware_setup(void)
        if (!cpu_has_vmx_unrestricted_guest())
                enable_unrestricted_guest = 0;
 
-       if (!cpu_has_vmx_flexpriority()) {
+       if (!cpu_has_vmx_flexpriority())
                flexpriority_enabled = 0;
 
-               /*
-                * set_apic_access_page_addr() is used to reload apic access
-                * page upon invalidation.  No need to do anything if the
-                * processor does not have the APIC_ACCESS_ADDR VMCS field.
-                */
+       /*
+        * set_apic_access_page_addr() is used to reload apic access
+        * page upon invalidation.  No need to do anything if not
+        * using the APIC_ACCESS_ADDR VMCS field.
+        */
+       if (!flexpriority_enabled)
                kvm_x86_ops->set_apic_access_page_addr = NULL;
-       }
 
        if (!cpu_has_vmx_tpr_shadow())
                kvm_x86_ops->update_cr8_intercept = NULL;