[tip:x86/urgent] x86/paravirt: Remove no longer used paravirt functions

From: tip-bot for Juergen Gross
Date: Wed Sep 13 2017 - 05:28:36 EST

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Commit-ID: 87930019c713873a1c3b9bd55dde46e81f70c8f1
Gitweb: http://git.kernel.org/tip/87930019c713873a1c3b9bd55dde46e81f70c8f1
Author: Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Mon, 4 Sep 2017 12:25:27 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 13 Sep 2017 10:55:15 +0200

x86/paravirt: Remove no longer used paravirt functions

With removal of lguest some of the paravirt functions are no longer
needed:

->read_cr4()
->store_idt()
->set_pmd_at()
->set_pud_at()
->pte_update()

Remove them.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: akataria@xxxxxxxxxx
Cc: boris.ostrovsky@xxxxxxxxxx
Cc: chrisw@xxxxxxxxxxxx
Cc: jeremy@xxxxxxxx
Cc: rusty@xxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20170904102527.25409-1-jgross@xxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/include/asm/desc.h | 3 +--
arch/x86/include/asm/paravirt.h | 37 -----------------------------------
arch/x86/include/asm/paravirt_types.h | 9 ---------
arch/x86/include/asm/pgtable.h | 27 ++++---------------------
arch/x86/include/asm/special_insns.h | 10 +++++-----
arch/x86/kernel/paravirt.c | 5 -----
arch/x86/kvm/vmx.c | 2 +-
arch/x86/mm/pgtable.c | 7 +------
arch/x86/xen/enlighten_pv.c | 2 --
arch/x86/xen/mmu_pv.c | 2 --
10 files changed, 12 insertions(+), 92 deletions(-)

diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index 1a2ba36..9d0e137 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -121,7 +121,6 @@ static inline int desc_empty(const void *ptr)
#define load_ldt(ldt) asm volatile("lldt %0"::"m" (ldt))

#define store_gdt(dtr) native_store_gdt(dtr)
-#define store_idt(dtr) native_store_idt(dtr)
#define store_tr(tr) (tr = native_store_tr())

#define load_TLS(t, cpu) native_load_tls(t, cpu)
@@ -228,7 +227,7 @@ static inline void native_store_gdt(struct desc_ptr *dtr)
asm volatile("sgdt %0":"=m" (*dtr));
}

-static inline void native_store_idt(struct desc_ptr *dtr)
+static inline void store_idt(struct desc_ptr *dtr)
{
asm volatile("sidt %0":"=m" (*dtr));
}
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index c25dd22..12deec7 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -71,11 +71,6 @@ static inline void write_cr3(unsigned long x)
PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
}

-static inline unsigned long __read_cr4(void)
-{
- return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
-}
-
static inline void __write_cr4(unsigned long x)
{
PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
@@ -228,10 +223,6 @@ static inline void set_ldt(const void *addr, unsigned entries)
{
PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
}
-static inline void store_idt(struct desc_ptr *dtr)
-{
- PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
-}
static inline unsigned long paravirt_store_tr(void)
{
return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
@@ -365,12 +356,6 @@ static inline void paravirt_release_p4d(unsigned long pfn)
PVOP_VCALL1(pv_mmu_ops.release_p4d, pfn);
}

-static inline void pte_update(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep)
-{
- PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
-}
-
static inline pte_t __pte(pteval_t val)
{
pteval_t ret;
@@ -472,28 +457,6 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
}

-static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
- pmd_t *pmdp, pmd_t pmd)
-{
- if (sizeof(pmdval_t) > sizeof(long))
- /* 5 arg words */
- pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
- else
- PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
- native_pmd_val(pmd));
-}
-
-static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
- pud_t *pudp, pud_t pud)
-{
- if (sizeof(pudval_t) > sizeof(long))
- /* 5 arg words */
- pv_mmu_ops.set_pud_at(mm, addr, pudp, pud);
- else
- PVOP_VCALL4(pv_mmu_ops.set_pud_at, mm, addr, pudp,
- native_pud_val(pud));
-}
-
static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
{
pmdval_t val = native_pmd_val(pmd);
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 6b64fc6..42873ed 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -107,7 +107,6 @@ struct pv_cpu_ops {
unsigned long (*read_cr0)(void);
void (*write_cr0)(unsigned long);

- unsigned long (*read_cr4)(void);
void (*write_cr4)(unsigned long);

#ifdef CONFIG_X86_64
@@ -119,8 +118,6 @@ struct pv_cpu_ops {
void (*load_tr_desc)(void);
void (*load_gdt)(const struct desc_ptr *);
void (*load_idt)(const struct desc_ptr *);
- /* store_gdt has been removed. */
- void (*store_idt)(struct desc_ptr *);
void (*set_ldt)(const void *desc, unsigned entries);
unsigned long (*store_tr)(void);
void (*load_tls)(struct thread_struct *t, unsigned int cpu);
@@ -245,12 +242,6 @@ struct pv_mmu_ops {
void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval);
void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
- void (*set_pmd_at)(struct mm_struct *mm, unsigned long addr,
- pmd_t *pmdp, pmd_t pmdval);
- void (*set_pud_at)(struct mm_struct *mm, unsigned long addr,
- pud_t *pudp, pud_t pudval);
- void (*pte_update)(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep);

pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
pte_t *ptep);
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 5b4c44d..b714934 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -55,8 +55,6 @@ extern pmdval_t early_pmd_flags;
#else /* !CONFIG_PARAVIRT */
#define set_pte(ptep, pte) native_set_pte(ptep, pte)
#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
-#define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
-#define set_pud_at(mm, addr, pudp, pud) native_set_pud_at(mm, addr, pudp, pud)

#define set_pte_atomic(ptep, pte) \
native_set_pte_atomic(ptep, pte)
@@ -87,8 +85,6 @@ extern pmdval_t early_pmd_flags;
#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
#define pmd_clear(pmd) native_pmd_clear(pmd)

-#define pte_update(mm, addr, ptep) do { } while (0)
-
#define pgd_val(x) native_pgd_val(x)
#define __pgd(x) native_make_pgd(x)

@@ -979,31 +975,18 @@ static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
native_set_pte(ptep, pte);
}

-static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
- pmd_t *pmdp , pmd_t pmd)
+static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmdp, pmd_t pmd)
{
native_set_pmd(pmdp, pmd);
}

-static inline void native_set_pud_at(struct mm_struct *mm, unsigned long addr,
- pud_t *pudp, pud_t pud)
+static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
+ pud_t *pudp, pud_t pud)
{
native_set_pud(pudp, pud);
}

-#ifndef CONFIG_PARAVIRT
-/*
- * Rules for using pte_update - it must be called after any PTE update which
- * has not been done using the set_pte / clear_pte interfaces. It is used by
- * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
- * updates should either be sets, clears, or set_pte_atomic for P->P
- * transitions, which means this hook should only be called for user PTEs.
- * This hook implies a P->P protection or access change has taken place, which
- * requires a subsequent TLB flush.
- */
-#define pte_update(mm, addr, ptep) do { } while (0)
-#endif
-
/*
* We only update the dirty/accessed state if we set
* the dirty bit by hand in the kernel, since the hardware
@@ -1031,7 +1014,6 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
pte_t pte = native_ptep_get_and_clear(ptep);
- pte_update(mm, addr, ptep);
return pte;
}

@@ -1058,7 +1040,6 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
- pte_update(mm, addr, ptep);
}

#define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 9efaabf..a24dfcf 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -135,6 +135,11 @@ static inline void native_wbinvd(void)

extern asmlinkage void native_load_gs_index(unsigned);

+static inline unsigned long __read_cr4(void)
+{
+ return native_read_cr4();
+}
+
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
@@ -173,11 +178,6 @@ static inline void write_cr3(unsigned long x)
native_write_cr3(x);
}

-static inline unsigned long __read_cr4(void)
-{
- return native_read_cr4();
-}
-
static inline void __write_cr4(unsigned long x)
{
native_write_cr4(x);
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index a14df9e..19a3e8f 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -327,7 +327,6 @@ __visible struct pv_cpu_ops pv_cpu_ops = {
.set_debugreg = native_set_debugreg,
.read_cr0 = native_read_cr0,
.write_cr0 = native_write_cr0,
- .read_cr4 = native_read_cr4,
.write_cr4 = native_write_cr4,
#ifdef CONFIG_X86_64
.read_cr8 = native_read_cr8,
@@ -343,7 +342,6 @@ __visible struct pv_cpu_ops pv_cpu_ops = {
.set_ldt = native_set_ldt,
.load_gdt = native_load_gdt,
.load_idt = native_load_idt,
- .store_idt = native_store_idt,
.store_tr = native_store_tr,
.load_tls = native_load_tls,
#ifdef CONFIG_X86_64
@@ -411,8 +409,6 @@ struct pv_mmu_ops pv_mmu_ops __ro_after_init = {
.set_pte = native_set_pte,
.set_pte_at = native_set_pte_at,
.set_pmd = native_set_pmd,
- .set_pmd_at = native_set_pmd_at,
- .pte_update = paravirt_nop,

.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
@@ -424,7 +420,6 @@ struct pv_mmu_ops pv_mmu_ops __ro_after_init = {
.pmd_clear = native_pmd_clear,
#endif
.set_pud = native_set_pud,
- .set_pud_at = native_set_pud_at,

.pmd_val = PTE_IDENT,
.make_pmd = PTE_IDENT,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 4253ade..699704d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5192,7 +5192,7 @@ static void vmx_set_constant_host_state(struct vcpu_vmx *vmx)
vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */

- native_store_idt(&dt);
+ store_idt(&dt);
vmcs_writel(HOST_IDTR_BASE, dt.address); /* 22.2.4 */
vmx->host_idt_base = dt.address;

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 218834a..b372f34 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -426,10 +426,8 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
{
int changed = !pte_same(*ptep, entry);

- if (changed && dirty) {
+ if (changed && dirty)
*ptep = entry;
- pte_update(vma->vm_mm, address, ptep);
- }

return changed;
}
@@ -486,9 +484,6 @@ int ptep_test_and_clear_young(struct vm_area_struct *vma,
ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
(unsigned long *) &ptep->pte);

- if (ret)
- pte_update(vma->vm_mm, addr, ptep);
-
return ret;
}

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index ae2a2e2..69b9def 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1038,7 +1038,6 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.read_cr0 = xen_read_cr0,
.write_cr0 = xen_write_cr0,

- .read_cr4 = native_read_cr4,
.write_cr4 = xen_write_cr4,

#ifdef CONFIG_X86_64
@@ -1073,7 +1072,6 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.alloc_ldt = xen_alloc_ldt,
.free_ldt = xen_free_ldt,

- .store_idt = native_store_idt,
.store_tr = xen_store_tr,

.write_ldt_entry = xen_write_ldt_entry,
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index 6b983b3..509f560 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -2409,8 +2409,6 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = {
.flush_tlb_single = xen_flush_tlb_single,
.flush_tlb_others = xen_flush_tlb_others,

- .pte_update = paravirt_nop,
-
.pgd_alloc = xen_pgd_alloc,
.pgd_free = xen_pgd_free,

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