diff options
| -rw-r--r-- | arch/x86/kernel/Makefile_64 | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/paravirt_patch_64.c | 56 |
2 files changed, 57 insertions, 0 deletions
diff --git a/arch/x86/kernel/Makefile_64 b/arch/x86/kernel/Makefile_64 index 7fcf972aa5d..b8f9d13eb5e 100644 --- a/arch/x86/kernel/Makefile_64 +++ b/arch/x86/kernel/Makefile_64 @@ -41,6 +41,7 @@ obj-$(CONFIG_X86_VSMP) += vsmp_64.o obj-$(CONFIG_K8_NB) += k8.o obj-$(CONFIG_AUDIT) += audit_64.o obj-$(CONFIG_EFI) += efi.o efi_64.o efi_stub_64.o +obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_64.o obj-$(CONFIG_MODULES) += module_64.o obj-$(CONFIG_PCI) += early-quirks.o diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c new file mode 100644 index 00000000000..cbfc4f3069e --- /dev/null +++ b/arch/x86/kernel/paravirt_patch_64.c @@ -0,0 +1,56 @@ +#include <asm/paravirt.h> +#include <asm/asm-offsets.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"); + +/* the three commands give us more control to how to return from a syscall */ +DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "movq %gs:" __stringify(pda_oldrsp) ", %rsp; swapgs; sysretq;"); +DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs"); + +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_syscall_ret); + 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; +} |