x86/paravirt: Use a single ops structure

Instead of using six globally visible paravirt ops structures combine
them in a single structure, keeping the original structures as
sub-structures.

This avoids the need to assemble struct paravirt_patch_template at
runtime on the stack each time apply_paravirt() is being called (i.e.
when loading a module).

[ tglx: Made the struct and the initializer tabular for readability sake ]

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Cc: virtualization@lists.linux-foundation.org
Cc: akataria@vmware.com
Cc: rusty@rustcorp.com.au
Cc: boris.ostrovsky@oracle.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/20180828074026.820-9-jgross@suse.com

arch/x86/xen/mmu_pv.c

@@ -2213,7 +2213,7 @@ static void __init xen_write_cr3_init(unsigned long cr3)
 	set_page_prot(initial_page_table, PAGE_KERNEL);
 	set_page_prot(initial_kernel_pmd, PAGE_KERNEL);
 
-	pv_mmu_ops.write_cr3 = &xen_write_cr3;
+	pv_ops.mmu.write_cr3 = &xen_write_cr3;
 }
 
 /*
@@ -2362,27 +2362,27 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 
 static void __init xen_post_allocator_init(void)
 {
-	pv_mmu_ops.set_pte = xen_set_pte;
-	pv_mmu_ops.set_pmd = xen_set_pmd;
-	pv_mmu_ops.set_pud = xen_set_pud;
+	pv_ops.mmu.set_pte = xen_set_pte;
+	pv_ops.mmu.set_pmd = xen_set_pmd;
+	pv_ops.mmu.set_pud = xen_set_pud;
 #ifdef CONFIG_X86_64
-	pv_mmu_ops.set_p4d = xen_set_p4d;
+	pv_ops.mmu.set_p4d = xen_set_p4d;
 #endif
 
 	/* This will work as long as patching hasn't happened yet
 	   (which it hasn't) */
-	pv_mmu_ops.alloc_pte = xen_alloc_pte;
-	pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
-	pv_mmu_ops.release_pte = xen_release_pte;
-	pv_mmu_ops.release_pmd = xen_release_pmd;
+	pv_ops.mmu.alloc_pte = xen_alloc_pte;
+	pv_ops.mmu.alloc_pmd = xen_alloc_pmd;
+	pv_ops.mmu.release_pte = xen_release_pte;
+	pv_ops.mmu.release_pmd = xen_release_pmd;
 #ifdef CONFIG_X86_64
-	pv_mmu_ops.alloc_pud = xen_alloc_pud;
-	pv_mmu_ops.release_pud = xen_release_pud;
+	pv_ops.mmu.alloc_pud = xen_alloc_pud;
+	pv_ops.mmu.release_pud = xen_release_pud;
 #endif
-	pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte);
+	pv_ops.mmu.make_pte = PV_CALLEE_SAVE(xen_make_pte);
 
 #ifdef CONFIG_X86_64
-	pv_mmu_ops.write_cr3 = &xen_write_cr3;
+	pv_ops.mmu.write_cr3 = &xen_write_cr3;
 #endif
 }
 
@@ -2470,7 +2470,7 @@ void __init xen_init_mmu_ops(void)
 	x86_init.paging.pagetable_init = xen_pagetable_init;
 	x86_init.hyper.init_after_bootmem = xen_after_bootmem;
 
-	pv_mmu_ops = xen_mmu_ops;
+	pv_ops.mmu = xen_mmu_ops;
 
 	memset(dummy_mapping, 0xff, PAGE_SIZE);
 }