[xen staging] vmx: let opt_ept_ad always reflect the current setting

[patchbot@xxxxxxx]

commit b4d01ede23847bed9471ca0b7071394aef693a1a
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Mon May 25 08:21:55 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon May 25 08:21:55 2020 +0200

    vmx: let opt_ept_ad always reflect the current setting
    
    In case opt_ept_ad has not been set explicitly by the user via command
    line or runtime parameter, it is treated as "no" on Avoton cpus.
    
    Change that handling by setting opt_ept_ad to 0 for this cpu type
    explicitly if no user value has been set.
    
    By putting this into the (renamed) boot time initialization of vmcs.c
    _vmx_cpu_up() can be made static.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c        | 22 +++++++++++++++-------
 xen/arch/x86/hvm/vmx/vmx.c         |  4 +---
 xen/include/asm-x86/hvm/vmx/vmcs.h |  3 +--
 3 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 4c23645454..221af9737a 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -315,10 +315,6 @@ static int vmx_init_vmcs_config(void)
 
         if ( !opt_ept_ad )
             _vmx_ept_vpid_cap &= ~VMX_EPT_AD_BIT;
-        else if ( /* Work around Erratum AVR41 on Avoton processors. */
-                  boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 0x4d &&
-                  opt_ept_ad < 0 )
-            _vmx_ept_vpid_cap &= ~VMX_EPT_AD_BIT;
 
         /*
          * Additional sanity checking before using EPT:
@@ -652,7 +648,7 @@ void vmx_cpu_dead(unsigned int cpu)
     vmx_pi_desc_fixup(cpu);
 }
 
-int _vmx_cpu_up(bool bsp)
+static int _vmx_cpu_up(bool bsp)
 {
     u32 eax, edx;
     int rc, bios_locked, cpu = smp_processor_id();
@@ -2108,9 +2104,21 @@ static void vmcs_dump(unsigned char ch)
     printk("**************************************\n");
 }
 
-void __init setup_vmcs_dump(void)
+int __init vmx_vmcs_init(void)
 {
-    register_keyhandler('v', vmcs_dump, "dump VT-x VMCSs", 1);
+    int ret;
+
+    if ( opt_ept_ad < 0 )
+        /* Work around Erratum AVR41 on Avoton processors. */
+        opt_ept_ad = !(boot_cpu_data.x86 == 6 &&
+                       boot_cpu_data.x86_model == 0x4d);
+
+    ret = _vmx_cpu_up(true);
+
+    if ( !ret )
+        register_keyhandler('v', vmcs_dump, "dump VT-x VMCSs", 1);
+
+    return ret;
 }
 
 static void __init __maybe_unused build_assertions(void)
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 6efa80e422..11a4dd94cf 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2482,7 +2482,7 @@ const struct hvm_function_table * __init start_vmx(void)
 {
     set_in_cr4(X86_CR4_VMXE);
 
-    if ( _vmx_cpu_up(true) )
+    if ( vmx_vmcs_init() )
     {
         printk("VMX: failed to initialise.\n");
         return NULL;
@@ -2553,8 +2553,6 @@ const struct hvm_function_table * __init start_vmx(void)
         vmx_function_table.get_guest_bndcfgs = vmx_get_guest_bndcfgs;
     }
 
-    setup_vmcs_dump();
-
     lbr_tsx_fixup_check();
     bdf93_fixup_check();
 
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 95c1dea7b8..906810592f 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -21,11 +21,10 @@
 #include <xen/mm.h>
 
 extern void vmcs_dump_vcpu(struct vcpu *v);
-extern void setup_vmcs_dump(void);
+extern int vmx_vmcs_init(void);
 extern int  vmx_cpu_up_prepare(unsigned int cpu);
 extern void vmx_cpu_dead(unsigned int cpu);
 extern int  vmx_cpu_up(void);
-extern int  _vmx_cpu_up(bool bsp);
 extern void vmx_cpu_down(void);
 
 struct vmcs_struct {
--
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