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x86/paravirt: Remove unused _paravirt_ident_32 

There is no user of _paravirt_ident_32 left in the tree. Remove it
together with the related paravirt_patch_ident_32().

paravirt_patch_ident_64() can be moved inside CONFIG_PARAVIRT_XXL=y.

Signed-off-by: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akataria@vmware.com
Cc: boris.ostrovsky@oracle.com
Cc: rusty@rustcorp.com.au
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20181030063301.15054-1-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Juergen Gross 2018-10-30 07:33:01 +01:00 committed by Ingo Molnar
parent f77084d963
commit 7847c7be04
4 changed files with 19 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/paravirt_types.h
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@ -361,7 +361,6 @@ extern struct paravirt_patch_template pv_ops;
__visible extern const char start_##ops##_##name[], end_##ops##_##name[]; \
asm(NATIVE_LABEL("start_", ops, name) code NATIVE_LABEL("end_", ops, name))
unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
unsigned paravirt_patch_default(u8 type, void *insnbuf,
unsigned long addr, unsigned len);
@ -651,7 +650,6 @@ void paravirt_leave_lazy_mmu(void);
void paravirt_flush_lazy_mmu(void);
void _paravirt_nop(void);
u32 _paravirt_ident_32(u32);
u64 _paravirt_ident_64(u64);
#define paravirt_nop ((void *)_paravirt_nop)

26
arch/x86/kernel/paravirt.c
View File

@ -56,17 +56,6 @@ asm (".pushsection .entry.text, \"ax\"\n"
".type _paravirt_nop, @function\n\t"
".popsection");
/* identity function, which can be inlined */
u32 notrace _paravirt_ident_32(u32 x)
{
return x;
}
u64 notrace _paravirt_ident_64(u64 x)
{
return x;
}
void __init default_banner(void)
{
printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
@ -102,6 +91,12 @@ static unsigned paravirt_patch_call(void *insnbuf, const void *target,
}
#ifdef CONFIG_PARAVIRT_XXL
/* identity function, which can be inlined */
u64 notrace _paravirt_ident_64(u64 x)
{
return x;
}
static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
unsigned long addr, unsigned len)
{
@ -146,13 +141,11 @@ unsigned paravirt_patch_default(u8 type, void *insnbuf,
else if (opfunc == _paravirt_nop)
ret = 0;
#ifdef CONFIG_PARAVIRT_XXL
/* identity functions just return their single argument */
else if (opfunc == _paravirt_ident_32)
ret = paravirt_patch_ident_32(insnbuf, len);
else if (opfunc == _paravirt_ident_64)
ret = paravirt_patch_ident_64(insnbuf, len);
#ifdef CONFIG_PARAVIRT_XXL
else if (type == PARAVIRT_PATCH(cpu.iret) ||
type == PARAVIRT_PATCH(cpu.usergs_sysret64))
/* If operation requires a jmp, then jmp */
@ -309,13 +302,8 @@ struct pv_info pv_info = {
#endif
};
#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
/* 32-bit pagetable entries */
#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_32)
#else
/* 64-bit pagetable entries */
#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64)
#endif
struct paravirt_patch_template pv_ops = {
/* Init ops. */

18
arch/x86/kernel/paravirt_patch_32.c
View File

@ -10,24 +10,18 @@ DEF_NATIVE(cpu, iret, "iret");
DEF_NATIVE(mmu, read_cr2, "mov %cr2, %eax");
DEF_NATIVE(mmu, write_cr3, "mov %eax, %cr3");
DEF_NATIVE(mmu, read_cr3, "mov %cr3, %eax");
#endif
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%eax)");
DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");
#endif
unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
{
/* arg in %eax, return in %eax */
return 0;
}
unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
{
/* arg in %edx:%eax, return in %edx:%eax */
return 0;
}
#endif
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%eax)");
DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");
#endif
extern bool pv_is_native_spin_unlock(void);
extern bool pv_is_native_vcpu_is_preempted(void);

20
arch/x86/kernel/paravirt_patch_64.c
View File

@ -15,27 +15,19 @@ DEF_NATIVE(cpu, wbinvd, "wbinvd");
DEF_NATIVE(cpu, usergs_sysret64, "swapgs; sysretq");
DEF_NATIVE(cpu, swapgs, "swapgs");
#endif
DEF_NATIVE(, mov32, "mov %edi, %eax");
DEF_NATIVE(, mov64, "mov %rdi, %rax");
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%rdi)");
DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");
#endif
unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
{
return paravirt_patch_insns(insnbuf, len,
start__mov32, end__mov32);
}
unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
{
return paravirt_patch_insns(insnbuf, len,
start__mov64, end__mov64);
}
#endif
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%rdi)");
DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");
#endif
extern bool pv_is_native_spin_unlock(void);
extern bool pv_is_native_vcpu_is_preempted(void);