[v3,03/12] VMX: drop vmcs_revision_id

Commit Message

Jan Beulich Feb. 26, 2024, 4:42 p.m. UTC

It's effectively redundant with vmx_basic_msr. For the #define
replacement to work, struct vmcs_struct's respective field name also
needs to change: Drop the not really meaningful "vmcs_" prefix from it.

Signed-off-by: Jan Beulich <[e-mail]>
---
v2: New.

Patch

--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -175,7 +175,7 @@  static DEFINE_PER_CPU(paddr_t, current_v
 static DEFINE_PER_CPU(struct list_head, active_vmcs_list);
 DEFINE_PER_CPU(bool, vmxon);
 
-static u32 vmcs_revision_id __read_mostly;
+#define vmcs_revision_id (vmx_basic_msr & VMX_BASIC_REVISION_MASK)
 u64 __read_mostly vmx_basic_msr;
 
 static void __init vmx_display_features(void)
@@ -498,7 +498,6 @@  static int vmx_init_vmcs_config(bool bsp
     if ( !vmx_pin_based_exec_control )
     {
         /* First time through. */
-        vmcs_revision_id           = vmx_basic_msr_low & VMX_BASIC_REVISION_MASK;
         vmx_pin_based_exec_control = _vmx_pin_based_exec_control;
         vmx_cpu_based_exec_control = _vmx_cpu_based_exec_control;
         vmx_secondary_exec_control = _vmx_secondary_exec_control;
@@ -610,7 +609,7 @@  static paddr_t vmx_alloc_vmcs(void)
 
     vmcs = __map_domain_page(pg);
     clear_page(vmcs);
-    vmcs->vmcs_revision_id = vmcs_revision_id;
+    vmcs->revision_id = vmcs_revision_id;
     unmap_domain_page(vmcs);
 
     return page_to_maddr(pg);
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1166,7 +1166,7 @@  static void nvmx_set_vmcs_pointer(struct
     paddr_t vvmcs_maddr = v->arch.hvm.vmx.vmcs_shadow_maddr;
 
     __vmpclear(vvmcs_maddr);
-    vvmcs->vmcs_revision_id |= VMCS_RID_TYPE_MASK;
+    vvmcs->revision_id |= VMCS_RID_TYPE_MASK;
     v->arch.hvm.vmx.secondary_exec_control |=
         SECONDARY_EXEC_ENABLE_VMCS_SHADOWING;
     __vmwrite(SECONDARY_VM_EXEC_CONTROL,
@@ -1181,7 +1181,7 @@  static void nvmx_clear_vmcs_pointer(stru
     paddr_t vvmcs_maddr = v->arch.hvm.vmx.vmcs_shadow_maddr;
 
     __vmpclear(vvmcs_maddr);
-    vvmcs->vmcs_revision_id &= ~VMCS_RID_TYPE_MASK;
+    vvmcs->revision_id &= ~VMCS_RID_TYPE_MASK;
     v->arch.hvm.vmx.secondary_exec_control &=
         ~SECONDARY_EXEC_ENABLE_VMCS_SHADOWING;
     __vmwrite(SECONDARY_VM_EXEC_CONTROL,
@@ -1799,10 +1799,10 @@  static int nvmx_handle_vmptrld(struct cp
             {
                 struct vmcs_struct *vvmcs = vvmcx;
 
-                if ( ((vvmcs->vmcs_revision_id ^ vmx_basic_msr) &
-                                         VMX_BASIC_REVISION_MASK) ||
+                if ( ((vvmcs->revision_id ^ vmx_basic_msr) &
+                      VMX_BASIC_REVISION_MASK) ||
                      (!cpu_has_vmx_vmcs_shadowing &&
-                      (vvmcs->vmcs_revision_id & ~VMX_BASIC_REVISION_MASK)) )
+                      (vvmcs->revision_id & ~VMX_BASIC_REVISION_MASK)) )
                 {
                     hvm_unmap_guest_frame(vvmcx, 1);
                     vmfail(regs, VMX_INSN_VMPTRLD_INCORRECT_VMCS_ID);
@@ -2214,7 +2214,7 @@  int nvmx_msr_read_intercept(unsigned int
             map_domain_page(_mfn(PFN_DOWN(v->arch.hvm.vmx.vmcs_pa)));
 
         data = (host_data & (~0ul << 32)) |
-               (vmcs->vmcs_revision_id & 0x7fffffff);
+               (vmcs->revision_id & 0x7fffffff);
         unmap_domain_page(vmcs);
 
         if ( !cpu_has_vmx_vmcs_shadowing )
--- a/xen/arch/x86/include/asm/hvm/vmx/vmcs.h
+++ b/xen/arch/x86/include/asm/hvm/vmx/vmcs.h
@@ -17,7 +17,7 @@  int cf_check vmx_cpu_up(void);
 void cf_check vmx_cpu_down(void);
 
 struct vmcs_struct {
-    u32 vmcs_revision_id;
+    uint32_t revision_id;
     unsigned char data [0]; /* vmcs size is read from MSR */
 };