paravirt_patch_64.c

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#include <asm/paravirt.h>
#include <asm/asm-offsets.h>
#include <linux/stringify.h>

DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
DEF_NATIVE(pv_cpu_ops, iret, "iretq");
DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
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");

DEF_NATIVE(, mov32, "mov %edi, %eax");
DEF_NATIVE(, mov64, "mov %rdi, %rax");

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);
}

unsigned native_patch(u8 type, u16 clobbers, 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(pv_irq_ops, restore_fl);
        PATCH_SITE(pv_irq_ops, save_fl);
        PATCH_SITE(pv_irq_ops, irq_enable);
        PATCH_SITE(pv_irq_ops, irq_disable);
        PATCH_SITE(pv_cpu_ops, iret);
        PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
        PATCH_SITE(pv_cpu_ops, usergs_sysret32);
        PATCH_SITE(pv_cpu_ops, usergs_sysret64);
        PATCH_SITE(pv_cpu_ops, swapgs);
        PATCH_SITE(pv_mmu_ops, read_cr2);
        PATCH_SITE(pv_mmu_ops, read_cr3);
        PATCH_SITE(pv_mmu_ops, write_cr3);
        PATCH_SITE(pv_cpu_ops, clts);
        PATCH_SITE(pv_mmu_ops, flush_tlb_single);
        PATCH_SITE(pv_cpu_ops, wbinvd);

    patch_site:
        ret = paravirt_patch_insns(ibuf, len, start, end);
        break;

    default:
        ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
        break;
    }
#undef PATCH_SITE
    return ret;
}