[Xen-devel] [PATCH 3/4] x86/desc: Shorten boot_{, comat_}gdt[] variable names

[Andrew Cooper <andrew.cooper3@citrix.com>]

The current names, boot_cpu_{,compat_}gdt_table, have a table suffix which is
redundant with the T of GDT, and the cpu infix doesn't provide any meaningful
context.  Drop them both.

Likewise, shorten the {,compat_}gdt{,_l1e} variables.

Finally, rename gdt_descr to boot_gdtr to more clearly identify its purpose.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Wei Liu <wl@xen.org>
CC: Roger Pau Monné <roger.pau@citrix.com>
---
 xen/arch/x86/boot/x86_64.S  | 10 +++++-----
 xen/arch/x86/cpu/common.c   |  4 ++--
 xen/arch/x86/domain.c       |  7 +++----
 xen/arch/x86/efi/efi-boot.h |  2 +-
 xen/arch/x86/hvm/svm/svm.c  |  2 +-
 xen/arch/x86/hvm/vmx/vmcs.c |  2 +-
 xen/arch/x86/smpboot.c      | 18 +++++++++---------
 xen/arch/x86/traps.c        | 30 ++++++++++++++----------------
 xen/common/efi/runtime.c    |  2 +-
 xen/include/asm-x86/desc.h  | 12 ++++++------
 xen/include/asm-x86/ldt.h   |  3 +--
 11 files changed, 44 insertions(+), 48 deletions(-)

diff --git a/xen/arch/x86/boot/x86_64.S b/xen/arch/x86/boot/x86_64.S
index cf47e019f5..3909363ca3 100644
--- a/xen/arch/x86/boot/x86_64.S
+++ b/xen/arch/x86/boot/x86_64.S
@@ -3,7 +3,7 @@
 
 ENTRY(__high_start)
         /* Install relocated data selectors. */
-        lgdt    gdt_descr(%rip)
+        lgdt    boot_gdtr(%rip)
         mov     $(__HYPERVISOR_DS64),%ecx
         mov     %ecx,%ds
         mov     %ecx,%es
@@ -44,16 +44,16 @@ multiboot_ptr:
         .long   0
 
         .word   0
-GLOBAL(gdt_descr)
+GLOBAL(boot_gdtr)
         .word   LAST_RESERVED_GDT_BYTE
-        .quad   boot_cpu_gdt_table - FIRST_RESERVED_GDT_BYTE
+        .quad   boot_gdt - FIRST_RESERVED_GDT_BYTE
 
 GLOBAL(stack_start)
         .quad   cpu0_stack
 
         .section .data.page_aligned, "aw", @progbits
         .align PAGE_SIZE, 0
-GLOBAL(boot_cpu_gdt_table)
+GLOBAL(boot_gdt)
         .quad 0x0000000000000000     /* unused */
         .quad 0x00af9a000000ffff     /* 0xe008 ring 0 code, 64-bit mode   */
         .quad 0x00cf92000000ffff     /* 0xe010 ring 0 data                */
@@ -68,7 +68,7 @@ GLOBAL(boot_cpu_gdt_table)
         .align PAGE_SIZE, 0
 /* NB. Even rings != 0 get access to the full 4Gb, as only the            */
 /*     (compatibility) machine->physical mapping table lives there.       */
-GLOBAL(boot_cpu_compat_gdt_table)
+GLOBAL(boot_compat_gdt)
         .quad 0x0000000000000000     /* unused */
         .quad 0x00af9a000000ffff     /* 0xe008 ring 0 code, 64-bit mode   */
         .quad 0x00cf92000000ffff     /* 0xe010 ring 0 data                */
diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c
index 7478e21177..dc2dea4d6d 100644
--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -709,9 +709,9 @@ void load_system_tables(void)
 
 	struct tss_struct *tss = &this_cpu(init_tss);
 	seg_desc_t *gdt =
-		this_cpu(gdt_table) - FIRST_RESERVED_GDT_ENTRY;
+		this_cpu(gdt) - FIRST_RESERVED_GDT_ENTRY;
 	seg_desc_t *compat_gdt =
-		this_cpu(compat_gdt_table) - FIRST_RESERVED_GDT_ENTRY;
+		this_cpu(compat_gdt) - FIRST_RESERVED_GDT_ENTRY;
 
 	const struct desc_ptr gdtr = {
 		.base = (unsigned long)gdt,
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 5933b3f51b..612afb683f 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1666,8 +1666,8 @@ static inline bool need_full_gdt(const struct domain *d)
 static void update_xen_slot_in_full_gdt(const struct vcpu *v, unsigned int cpu)
 {
     l1e_write(pv_gdt_ptes(v) + FIRST_RESERVED_GDT_PAGE,
-              !is_pv_32bit_vcpu(v) ? per_cpu(gdt_table_l1e, cpu)
-                                   : per_cpu(compat_gdt_table_l1e, cpu));
+              !is_pv_32bit_vcpu(v) ? per_cpu(gdt_l1e, cpu)
+                                   : per_cpu(compat_gdt_l1e, cpu));
 }
 
 static void load_full_gdt(const struct vcpu *v, unsigned int cpu)
@@ -1686,8 +1686,7 @@ static void load_default_gdt(unsigned int cpu)
 {
     struct desc_ptr gdt_desc = {
         .limit = LAST_RESERVED_GDT_BYTE,
-        .base  = (unsigned long)(per_cpu(gdt_table, cpu) -
-                                 FIRST_RESERVED_GDT_ENTRY),
+        .base  = (unsigned long)(per_cpu(gdt, cpu) - FIRST_RESERVED_GDT_ENTRY),
     };
 
     lgdt(&gdt_desc);
diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h
index 2f59d8bdbd..5324149f93 100644
--- a/xen/arch/x86/efi/efi-boot.h
+++ b/xen/arch/x86/efi/efi-boot.h
@@ -250,7 +250,7 @@ static void __init noreturn efi_arch_post_exit_boot(void)
                    "mov    %[cr4], %%cr4\n\t"
 #endif
                    /* Load data segments. */
-                   "lgdt   gdt_descr(%%rip)\n\t"
+                   "lgdt   boot_gdtr(%%rip)\n\t"
                    "mov    %[ds], %%ss\n\t"
                    "mov    %[ds], %%ds\n\t"
                    "mov    %[ds], %%es\n\t"
diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index d81401dbc0..deafa3864e 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -1568,7 +1568,7 @@ bool svm_load_segs(unsigned int ldt_ents, unsigned long ldt_base,
     {
         /* Keep GDT in sync. */
         seg_desc_t *desc =
-            this_cpu(gdt_table) + LDT_ENTRY - FIRST_RESERVED_GDT_ENTRY;
+            this_cpu(gdt) + LDT_ENTRY - FIRST_RESERVED_GDT_ENTRY;
 
         _set_tssldt_desc(desc, ldt_base, ldt_ents * 8 - 1, SYS_DESC_ldt);
 
diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 45d18493df..098613822a 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -793,7 +793,7 @@ static void vmx_set_host_env(struct vcpu *v)
     unsigned int cpu = smp_processor_id();
 
     __vmwrite(HOST_GDTR_BASE,
-              (unsigned long)(this_cpu(gdt_table) - FIRST_RESERVED_GDT_ENTRY));
+              (unsigned long)(this_cpu(gdt) - FIRST_RESERVED_GDT_ENTRY));
     __vmwrite(HOST_IDTR_BASE, (unsigned long)idt_tables[cpu]);
 
     __vmwrite(HOST_TR_BASE, (unsigned long)&per_cpu(init_tss, cpu));
diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
index 65e9ceeece..8d5fef0012 100644
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -944,11 +944,11 @@ static void cpu_smpboot_free(unsigned int cpu, bool remove)
             free_domheap_page(mfn_to_page(mfn));
     }
 
-    FREE_XENHEAP_PAGE(per_cpu(compat_gdt_table, cpu));
+    FREE_XENHEAP_PAGE(per_cpu(compat_gdt, cpu));
 
     if ( remove )
     {
-        FREE_XENHEAP_PAGE(per_cpu(gdt_table, cpu));
+        FREE_XENHEAP_PAGE(per_cpu(gdt, cpu));
         FREE_XENHEAP_PAGE(idt_tables[cpu]);
 
         if ( stack_base[cpu] )
@@ -976,22 +976,22 @@ static int cpu_smpboot_alloc(unsigned int cpu)
         goto out;
     memguard_guard_stack(stack_base[cpu]);
 
-    gdt = per_cpu(gdt_table, cpu) ?: alloc_xenheap_pages(0, memflags);
+    gdt = per_cpu(gdt, cpu) ?: alloc_xenheap_pages(0, memflags);
     if ( gdt == NULL )
         goto out;
-    per_cpu(gdt_table, cpu) = gdt;
-    per_cpu(gdt_table_l1e, cpu) =
+    per_cpu(gdt, cpu) = gdt;
+    per_cpu(gdt_l1e, cpu) =
         l1e_from_pfn(virt_to_mfn(gdt), __PAGE_HYPERVISOR_RW);
-    memcpy(gdt, boot_cpu_gdt_table, NR_RESERVED_GDT_PAGES * PAGE_SIZE);
+    memcpy(gdt, boot_gdt, NR_RESERVED_GDT_PAGES * PAGE_SIZE);
     BUILD_BUG_ON(NR_CPUS > 0x10000);
     gdt[PER_CPU_GDT_ENTRY - FIRST_RESERVED_GDT_ENTRY].a = cpu;
 
-    per_cpu(compat_gdt_table, cpu) = gdt = alloc_xenheap_pages(0, memflags);
+    per_cpu(compat_gdt, cpu) = gdt = alloc_xenheap_pages(0, memflags);
     if ( gdt == NULL )
         goto out;
-    per_cpu(compat_gdt_table_l1e, cpu) =
+    per_cpu(compat_gdt_l1e, cpu) =
         l1e_from_pfn(virt_to_mfn(gdt), __PAGE_HYPERVISOR_RW);
-    memcpy(gdt, boot_cpu_compat_gdt_table, NR_RESERVED_GDT_PAGES * PAGE_SIZE);
+    memcpy(gdt, boot_compat_gdt, NR_RESERVED_GDT_PAGES * PAGE_SIZE);
     gdt[PER_CPU_GDT_ENTRY - FIRST_RESERVED_GDT_ENTRY].a = cpu;
 
     if ( idt_tables[cpu] == NULL )
diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 38d12013db..162f708ac3 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -96,10 +96,10 @@ string_param("nmi", opt_nmi);
 DEFINE_PER_CPU(uint64_t, efer);
 static DEFINE_PER_CPU(unsigned long, last_extable_addr);
 
-DEFINE_PER_CPU_READ_MOSTLY(seg_desc_t *, gdt_table);
-DEFINE_PER_CPU_READ_MOSTLY(l1_pgentry_t, gdt_table_l1e);
-DEFINE_PER_CPU_READ_MOSTLY(seg_desc_t *, compat_gdt_table);
-DEFINE_PER_CPU_READ_MOSTLY(l1_pgentry_t, compat_gdt_table_l1e);
+DEFINE_PER_CPU_READ_MOSTLY(seg_desc_t *, gdt);
+DEFINE_PER_CPU_READ_MOSTLY(l1_pgentry_t, gdt_l1e);
+DEFINE_PER_CPU_READ_MOSTLY(seg_desc_t *, compat_gdt);
+DEFINE_PER_CPU_READ_MOSTLY(l1_pgentry_t, compat_gdt_l1e);
 
 /* Master table, used by CPU0. */
 idt_entry_t __section(".bss.page_aligned") __aligned(PAGE_SIZE)
@@ -1899,17 +1899,17 @@ void load_TR(void)
 {
     struct tss_struct *tss = &this_cpu(init_tss);
     struct desc_ptr old_gdt, tss_gdt = {
-        .base = (long)(this_cpu(gdt_table) - FIRST_RESERVED_GDT_ENTRY),
+        .base = (long)(this_cpu(gdt) - FIRST_RESERVED_GDT_ENTRY),
         .limit = LAST_RESERVED_GDT_BYTE
     };
 
     _set_tssldt_desc(
-        this_cpu(gdt_table) + TSS_ENTRY - FIRST_RESERVED_GDT_ENTRY,
+        this_cpu(gdt) + TSS_ENTRY - FIRST_RESERVED_GDT_ENTRY,
         (unsigned long)tss,
         offsetof(struct tss_struct, __cacheline_filler) - 1,
         SYS_DESC_tss_avail);
     _set_tssldt_desc(
-        this_cpu(compat_gdt_table) + TSS_ENTRY - FIRST_RESERVED_GDT_ENTRY,
+        this_cpu(compat_gdt) + TSS_ENTRY - FIRST_RESERVED_GDT_ENTRY,
         (unsigned long)tss,
         offsetof(struct tss_struct, __cacheline_filler) - 1,
         SYS_DESC_tss_busy);
@@ -2000,8 +2000,8 @@ void __init init_idt_traps(void)
     /* CPU0 uses the master IDT. */
     idt_tables[0] = idt_table;
 
-    this_cpu(gdt_table) = boot_cpu_gdt_table;
-    this_cpu(compat_gdt_table) = boot_cpu_compat_gdt_table;
+    this_cpu(gdt) = boot_gdt;
+    this_cpu(compat_gdt) = boot_compat_gdt;
 }
 
 extern void (*const autogen_entrypoints[NR_VECTORS])(void);
@@ -2029,13 +2029,11 @@ void __init trap_init(void)
         }
     }
 
-    /* Cache {,compat_}gdt_table_l1e now that physically relocation is done. */
-    this_cpu(gdt_table_l1e) =
-        l1e_from_pfn(virt_to_mfn(boot_cpu_gdt_table),
-                     __PAGE_HYPERVISOR_RW);
-    this_cpu(compat_gdt_table_l1e) =
-        l1e_from_pfn(virt_to_mfn(boot_cpu_compat_gdt_table),
-                     __PAGE_HYPERVISOR_RW);
+    /* Cache {,compat_}gdt_l1e now that physically relocation is done. */
+    this_cpu(gdt_l1e) =
+        l1e_from_pfn(virt_to_mfn(boot_gdt), __PAGE_HYPERVISOR_RW);
+    this_cpu(compat_gdt_l1e) =
+        l1e_from_pfn(virt_to_mfn(boot_compat_gdt), __PAGE_HYPERVISOR_RW);
 
     percpu_traps_init();
 
diff --git a/xen/common/efi/runtime.c b/xen/common/efi/runtime.c
index 3d118d571d..ab53ebcc55 100644
--- a/xen/common/efi/runtime.c
+++ b/xen/common/efi/runtime.c
@@ -104,7 +104,7 @@ struct efi_rs_state efi_rs_enter(void)
     {
         struct desc_ptr gdt_desc = {
             .limit = LAST_RESERVED_GDT_BYTE,
-            .base  = (unsigned long)(per_cpu(gdt_table, smp_processor_id()) -
+            .base  = (unsigned long)(per_cpu(gdt, smp_processor_id()) -
                                      FIRST_RESERVED_GDT_ENTRY)
         };
 
diff --git a/xen/include/asm-x86/desc.h b/xen/include/asm-x86/desc.h
index c011c03ae2..0be9348d29 100644
--- a/xen/include/asm-x86/desc.h
+++ b/xen/include/asm-x86/desc.h
@@ -204,12 +204,12 @@ struct __packed desc_ptr {
 	unsigned long base;
 };
 
-extern seg_desc_t boot_cpu_gdt_table[];
-DECLARE_PER_CPU(seg_desc_t *, gdt_table);
-DECLARE_PER_CPU(l1_pgentry_t, gdt_table_l1e);
-extern seg_desc_t boot_cpu_compat_gdt_table[];
-DECLARE_PER_CPU(seg_desc_t *, compat_gdt_table);
-DECLARE_PER_CPU(l1_pgentry_t, compat_gdt_table_l1e);
+extern seg_desc_t boot_gdt[];
+DECLARE_PER_CPU(seg_desc_t *, gdt);
+DECLARE_PER_CPU(l1_pgentry_t, gdt_l1e);
+extern seg_desc_t boot_compat_gdt[];
+DECLARE_PER_CPU(seg_desc_t *, compat_gdt);
+DECLARE_PER_CPU(l1_pgentry_t, compat_gdt_l1e);
 DECLARE_PER_CPU(bool, full_gdt_loaded);
 
 extern void load_TR(void);
diff --git a/xen/include/asm-x86/ldt.h b/xen/include/asm-x86/ldt.h
index da502329fb..1383f55308 100644
--- a/xen/include/asm-x86/ldt.h
+++ b/xen/include/asm-x86/ldt.h
@@ -13,8 +13,7 @@ static inline void load_LDT(struct vcpu *v)
         lldt(0);
     else
     {
-        desc = (!is_pv_32bit_vcpu(v)
-                ? this_cpu(gdt_table) : this_cpu(compat_gdt_table))
+        desc = (!is_pv_32bit_vcpu(v) ? this_cpu(gdt) : this_cpu(compat_gdt))
                + LDT_ENTRY - FIRST_RESERVED_GDT_ENTRY;
         _set_tssldt_desc(desc, LDT_VIRT_START(v), ents*8-1, SYS_DESC_ldt);
         lldt(LDT_ENTRY << 3);
-- 
2.11.0


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