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x86/paravirt: Remove the unused irq_enable_sysexit pv op 

As result of commit "x86/xen: Avoid fast syscall path for Xen PV
guests", the irq_enable_sysexit pv op is not called by Xen PV guests
anymore and since they were the only ones who used it we can
safely remove it.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: david.vrabel@citrix.com
Cc: konrad.wilk@oracle.com
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/1447970147-1733-3-git-send-email-boris.ostrovsky@oracle.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Boris Ostrovsky 2015-11-19 16:55:46 -05:00 коммит произвёл Ingo Molnar
Родитель 5fdf5d37f4
Коммит 88c15ec90f
10 изменённых файлов: 2 добавлений и 55 удалений
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8
arch/x86/entry/entry_32.S
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@ -329,7 +329,8 @@ sysenter_past_esp:
* Return back to the vDSO, which will pop ecx and edx.
* Don't bother with DS and ES (they already contain __USER_DS).
*/
ENABLE_INTERRUPTS_SYSEXIT
sti
sysexit
.pushsection .fixup, "ax"
2: movl $0, PT_FS(%esp)
@ -552,11 +553,6 @@ ENTRY(native_iret)
iret
_ASM_EXTABLE(native_iret, iret_exc)
END(native_iret)
ENTRY(native_irq_enable_sysexit)
sti
sysexit
END(native_irq_enable_sysexit)
#endif
ENTRY(overflow)

7
arch/x86/include/asm/paravirt.h
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@ -932,13 +932,6 @@ extern void default_banner(void);
push %ecx; push %edx; \
call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
pop %edx; pop %ecx
#define ENABLE_INTERRUPTS_SYSEXIT \
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit), \
CLBR_NONE, \
jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
#else /* !CONFIG_X86_32 */
/*

9
arch/x86/include/asm/paravirt_types.h
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@ -157,15 +157,6 @@ struct pv_cpu_ops {
u64 (*read_pmc)(int counter);
#ifdef CONFIG_X86_32
/*
* Atomically enable interrupts and return to userspace. This
* is only used in 32-bit kernels. 64-bit kernels use
* usergs_sysret32 instead.
*/
void (*irq_enable_sysexit)(void);
#endif
/*
* Switch to usermode gs and return to 64-bit usermode using
* sysret. Only used in 64-bit kernels to return to 64-bit

3
arch/x86/kernel/asm-offsets.c
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@ -65,9 +65,6 @@ void common(void) {
OFFSET(PV_IRQ_irq_disable, pv_irq_ops, irq_disable);
OFFSET(PV_IRQ_irq_enable, pv_irq_ops, irq_enable);
OFFSET(PV_CPU_iret, pv_cpu_ops, iret);
#ifdef CONFIG_X86_32
OFFSET(PV_CPU_irq_enable_sysexit, pv_cpu_ops, irq_enable_sysexit);
#endif
OFFSET(PV_CPU_read_cr0, pv_cpu_ops, read_cr0);
OFFSET(PV_MMU_read_cr2, pv_mmu_ops, read_cr2);
#endif

7
arch/x86/kernel/paravirt.c
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@ -162,9 +162,6 @@ unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
ret = paravirt_patch_ident_64(insnbuf, len);
else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
#ifdef CONFIG_X86_32
type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) ||
#endif
type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret32) ||
type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret64))
/* If operation requires a jmp, then jmp */
@ -220,7 +217,6 @@ static u64 native_steal_clock(int cpu)
/* These are in entry.S */
extern void native_iret(void);
extern void native_irq_enable_sysexit(void);
extern void native_usergs_sysret32(void);
extern void native_usergs_sysret64(void);
@ -379,9 +375,6 @@ __visible struct pv_cpu_ops pv_cpu_ops = {
.load_sp0 = native_load_sp0,
#if defined(CONFIG_X86_32)
.irq_enable_sysexit = native_irq_enable_sysexit,
#endif
#ifdef CONFIG_X86_64
#ifdef CONFIG_IA32_EMULATION
.usergs_sysret32 = native_usergs_sysret32,

2
arch/x86/kernel/paravirt_patch_32.c
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@ -5,7 +5,6 @@ DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
DEF_NATIVE(pv_cpu_ops, iret, "iret");
DEF_NATIVE(pv_cpu_ops, irq_enable_sysexit, "sti; sysexit");
DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
@ -46,7 +45,6 @@ unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
PATCH_SITE(pv_irq_ops, restore_fl);
PATCH_SITE(pv_irq_ops, save_fl);
PATCH_SITE(pv_cpu_ops, iret);
PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
PATCH_SITE(pv_mmu_ops, read_cr2);
PATCH_SITE(pv_mmu_ops, read_cr3);
PATCH_SITE(pv_mmu_ops, write_cr3);

1
arch/x86/kernel/paravirt_patch_64.c
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@ -13,7 +13,6 @@ DEF_NATIVE(pv_mmu_ops, flush_tlb_single, "invlpg (%rdi)");
DEF_NATIVE(pv_cpu_ops, clts, "clts");
DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
DEF_NATIVE(pv_cpu_ops, irq_enable_sysexit, "swapgs; sti; sysexit");
DEF_NATIVE(pv_cpu_ops, usergs_sysret64, "swapgs; sysretq");
DEF_NATIVE(pv_cpu_ops, usergs_sysret32, "swapgs; sysretl");
DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");

3
arch/x86/xen/enlighten.c
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@ -1229,10 +1229,7 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.iret = xen_iret,
#ifdef CONFIG_X86_64
.usergs_sysret32 = xen_sysret32,
.usergs_sysret64 = xen_sysret64,
#else
.irq_enable_sysexit = xen_sysexit,
#endif
.load_tr_desc = paravirt_nop,

14
arch/x86/xen/xen-asm_32.S
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@ -34,20 +34,6 @@ check_events:
pop %eax
ret
/*
* We can't use sysexit directly, because we're not running in ring0.
* But we can easily fake it up using iret. Assuming xen_sysexit is
* jumped to with a standard stack frame, we can just strip it back to
* a standard iret frame and use iret.
*/
ENTRY(xen_sysexit)
movl PT_EAX(%esp), %eax /* Shouldn't be necessary? */
orl $X86_EFLAGS_IF, PT_EFLAGS(%esp)
lea PT_EIP(%esp), %esp
jmp xen_iret
ENDPROC(xen_sysexit)
/*
* This is run where a normal iret would be run, with the same stack setup:
* 8: eflags

3
arch/x86/xen/xen-ops.h
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@ -139,9 +139,6 @@ DECL_ASM(void, xen_restore_fl_direct, unsigned long);
/* These are not functions, and cannot be called normally */
__visible void xen_iret(void);
#ifdef CONFIG_X86_32
__visible void xen_sysexit(void);
#endif
__visible void xen_sysret32(void);
__visible void xen_sysret64(void);
__visible void xen_adjust_exception_frame(void);