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x86/paravirt: Move the Xen-only pv_cpu_ops under the PARAVIRT_XXL umbrella

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Most of the paravirt ops defined in pv_cpu_ops are for Xen PV guests
only. Define them only if CONFIG_PARAVIRT_XXL is set.

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/20180828074026.820-13-jgross@suse.com
This commit is contained in:
Juergen Gross
2018-08-28 09:40:23 +02:00
committed by Thomas Gleixner
parent 40181646db
commit 9bad5658ea
16 changed files with 78 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
arch/x86/kernel/paravirt.c
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@ -101,6 +101,7 @@ static unsigned paravirt_patch_call(void *insnbuf, const void *target,
return 5;
}
#ifdef CONFIG_PARAVIRT_XXL
static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
unsigned long addr, unsigned len)
{
@ -119,6 +120,7 @@ static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
return 5;
}
#endif
DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key);
@ -150,10 +152,12 @@ unsigned paravirt_patch_default(u8 type, void *insnbuf,
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 */
ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
#endif
else
/* Otherwise call the function. */
ret = paravirt_patch_call(insnbuf, opfunc, addr, len);
@ -262,6 +266,7 @@ void paravirt_flush_lazy_mmu(void)
preempt_enable();
}
#ifdef CONFIG_PARAVIRT_XXL
void paravirt_start_context_switch(struct task_struct *prev)
{
BUG_ON(preemptible());
@ -282,6 +287,7 @@ void paravirt_end_context_switch(struct task_struct *next)
if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
arch_enter_lazy_mmu_mode();
}
#endif
enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
{
@ -320,6 +326,9 @@ struct paravirt_patch_template pv_ops = {
.time.steal_clock = native_steal_clock,
/* Cpu ops. */
.cpu.io_delay = native_io_delay,
#ifdef CONFIG_PARAVIRT_XXL
.cpu.cpuid = native_cpuid,
.cpu.get_debugreg = native_get_debugreg,
.cpu.set_debugreg = native_set_debugreg,
@ -361,10 +370,10 @@ struct paravirt_patch_template pv_ops = {
.cpu.swapgs = native_swapgs,
.cpu.set_iopl_mask = native_set_iopl_mask,
.cpu.io_delay = native_io_delay,
.cpu.start_context_switch = paravirt_nop,
.cpu.end_context_switch = paravirt_nop,
#endif /* CONFIG_PARAVIRT_XXL */
/* Irq ops. */
.irq.save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
@ -464,10 +473,12 @@ struct paravirt_patch_template pv_ops = {
#endif
};
#ifdef CONFIG_PARAVIRT_XXL
/* At this point, native_get/set_debugreg has real function entries */
NOKPROBE_SYMBOL(native_get_debugreg);
NOKPROBE_SYMBOL(native_set_debugreg);
NOKPROBE_SYMBOL(native_load_idt);
#endif
EXPORT_SYMBOL_GPL(pv_ops);
EXPORT_SYMBOL_GPL(pv_info);