[PATCH 14/28] x86: vdso: Allocate vvar page from C code

[Thomas Weißschuh]

Allocate the vvar page through the standard union vdso_data_store
and remove the custom linker script logic.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
---
 arch/x86/entry/vdso/vma.c            | 16 +++++-----------
 arch/x86/include/asm/vdso/vsyscall.h |  6 ++++--
 arch/x86/kernel/vmlinux.lds.S        | 23 -----------------------
 arch/x86/tools/relocs.c              |  1 -
 4 files changed, 9 insertions(+), 37 deletions(-)

diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index 8437906fd4b353ad0fe208d811817a1b6f8f8dcb..5731dc35d1d2c0b81c37adf133fc6fa35c41cba1 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -20,25 +20,19 @@
 #include <asm/vgtod.h>
 #include <asm/proto.h>
 #include <asm/vdso.h>
-#include <asm/vvar.h>
 #include <asm/tlb.h>
 #include <asm/page.h>
 #include <asm/desc.h>
 #include <asm/cpufeature.h>
 #include <clocksource/hyperv_timer.h>
 
-#undef _ASM_X86_VVAR_H
-#define EMIT_VVAR(name, offset)	\
-	const size_t name ## _offset = offset;
-#include <asm/vvar.h>
-
 struct vdso_data *arch_get_vdso_data(void *vvar_page)
 {
-	return (struct vdso_data *)(vvar_page + _vdso_data_offset);
+	return (struct vdso_data *)vvar_page;
 }
-#undef EMIT_VVAR
 
-DEFINE_VVAR(struct vdso_data, _vdso_data);
+static union vdso_data_store vdso_data_store __page_aligned_data;
+struct vdso_data *vdso_data = vdso_data_store.data;
 
 unsigned int vclocks_used __read_mostly;
 
@@ -153,7 +147,7 @@ static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
 	if (sym_offset == image->sym_vvar_page) {
 		struct page *timens_page = find_timens_vvar_page(vma);
 
-		pfn = __pa_symbol(&__vvar_page) >> PAGE_SHIFT;
+		pfn = __pa_symbol(vdso_data) >> PAGE_SHIFT;
 
 		/*
 		 * If a task belongs to a time namespace then a namespace
@@ -200,7 +194,7 @@ static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
 		if (!timens_page)
 			return VM_FAULT_SIGBUS;
 
-		pfn = __pa_symbol(&__vvar_page) >> PAGE_SHIFT;
+		pfn = __pa_symbol(vdso_data) >> PAGE_SHIFT;
 		return vmf_insert_pfn(vma, vmf->address, pfn);
 	}
 
diff --git a/arch/x86/include/asm/vdso/vsyscall.h b/arch/x86/include/asm/vdso/vsyscall.h
index 2cbb32a8a45e2f5c7bc02172af0fa09173f33924..5d6760746d15b0e12c7bf0eb727241e7576ca9c7 100644
--- a/arch/x86/include/asm/vdso/vsyscall.h
+++ b/arch/x86/include/asm/vdso/vsyscall.h
@@ -9,20 +9,22 @@
 #include <asm/vgtod.h>
 #include <asm/vvar.h>
 
+extern struct vdso_data *vdso_data;
+
 /*
  * Update the vDSO data page to keep in sync with kernel timekeeping.
  */
 static __always_inline
 struct vdso_data *__x86_get_k_vdso_data(void)
 {
-	return _vdso_data;
+	return vdso_data;
 }
 #define __arch_get_k_vdso_data __x86_get_k_vdso_data
 
 static __always_inline
 struct vdso_rng_data *__x86_get_k_vdso_rng_data(void)
 {
-	return (void *)&__vvar_page + __VDSO_RND_DATA_OFFSET;
+	return (void *)vdso_data + __VDSO_RND_DATA_OFFSET;
 }
 #define __arch_get_k_vdso_rng_data __x86_get_k_vdso_rng_data
 
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 6726be89b7a663a1554f8f4b297bba65b4ebdf61..e7e19842736a774191142b6ce43bf5567540cb80 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -193,29 +193,6 @@ SECTIONS
 
 	ORC_UNWIND_TABLE
 
-	. = ALIGN(PAGE_SIZE);
-	__vvar_page = .;
-
-	.vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
-		/* work around gold bug 13023 */
-		__vvar_beginning_hack = .;
-
-		/* Place all vvars at the offsets in asm/vvar.h. */
-#define EMIT_VVAR(name, offset)				\
-		. = __vvar_beginning_hack + offset;	\
-		*(.vvar_ ## name)
-#include <asm/vvar.h>
-#undef EMIT_VVAR
-
-		/*
-		 * Pad the rest of the page with zeros.  Otherwise the loader
-		 * can leave garbage here.
-		 */
-		. = __vvar_beginning_hack + PAGE_SIZE;
-	} :data
-
-	. = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
-
 	/* Init code and data - will be freed after init */
 	. = ALIGN(PAGE_SIZE);
 	.init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index c101bed6194000004bd84e1679259cce9977d290..6afe2e5e9102873634c6ad9a3a0b9c66bba5da50 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -89,7 +89,6 @@ static const char * const	sym_regex_kernel[S_NSYMTYPES] = {
 	"init_per_cpu__.*|"
 	"__end_rodata_hpage_align|"
 #endif
-	"__vvar_page|"
 	"_end)$"
 };
 

-- 
2.47.0