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

[linux-2.6-block.git] / arch / x86 / kernel / paravirt_patch_64.c

// SPDX-License-Identifier: GPL-2.0
#include <asm/paravirt.h>
#include <asm/asm-offsets.h>
#include <linux/stringify.h>

DEF_NATIVE(irq, irq_disable, "cli");
DEF_NATIVE(irq, irq_enable, "sti");
DEF_NATIVE(irq, restore_fl, "pushq %rdi; popfq");
DEF_NATIVE(irq, save_fl, "pushfq; popq %rax");
DEF_NATIVE(mmu, read_cr2, "movq %cr2, %rax");
DEF_NATIVE(mmu, read_cr3, "movq %cr3, %rax");
DEF_NATIVE(mmu, write_cr3, "movq %rdi, %cr3");
#ifdef CONFIG_PARAVIRT_XXL
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);
}

extern bool pv_is_native_spin_unlock(void);
extern bool pv_is_native_vcpu_is_preempted(void);

unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
{
	const unsigned char *start, *end;
	unsigned ret;

#define PATCH_SITE(ops, x)					\
		case PARAVIRT_PATCH(ops.x):			\
			start = start_##ops##_##x;		\
			end = end_##ops##_##x;			\
			goto patch_site
	switch(type) {
		PATCH_SITE(irq, restore_fl);
		PATCH_SITE(irq, save_fl);
		PATCH_SITE(irq, irq_enable);
		PATCH_SITE(irq, irq_disable);
#ifdef CONFIG_PARAVIRT_XXL
		PATCH_SITE(cpu, usergs_sysret64);
		PATCH_SITE(cpu, swapgs);
		PATCH_SITE(cpu, wbinvd);
#endif
		PATCH_SITE(mmu, read_cr2);
		PATCH_SITE(mmu, read_cr3);
		PATCH_SITE(mmu, write_cr3);
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
		case PARAVIRT_PATCH(lock.queued_spin_unlock):
			if (pv_is_native_spin_unlock()) {
				start = start_lock_queued_spin_unlock;
				end   = end_lock_queued_spin_unlock;
				goto patch_site;
			}
			goto patch_default;

		case PARAVIRT_PATCH(lock.vcpu_is_preempted):
			if (pv_is_native_vcpu_is_preempted()) {
				start = start_lock_vcpu_is_preempted;
				end   = end_lock_vcpu_is_preempted;
				goto patch_site;
			}
			goto patch_default;
#endif

	default:
patch_default: __maybe_unused
		ret = paravirt_patch_default(type, ibuf, addr, len);
		break;

patch_site:
		ret = paravirt_patch_insns(ibuf, len, start, end);
		break;
	}
#undef PATCH_SITE
	return ret;
}