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x86/paravirt: split paravirt definitions into paravirt_types.h
Split the monolithic asm/paravirt.h into separate paravirt.h (inlines and other "active" definitions), and paravirt_types.h (types, constants and other "passive" definitions). This makes it easier to use the type/constant definitions without pulling in everything else and causing circular dependency problems. [ Impact: cleanup ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge
parent
3fe0344faf
commit
ac5672f82c
@ -7,689 +7,11 @@
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#include <asm/pgtable_types.h>
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#include <asm/asm.h>
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/* Bitmask of what can be clobbered: usually at least eax. */
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#define CLBR_NONE 0
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#define CLBR_EAX (1 << 0)
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#define CLBR_ECX (1 << 1)
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#define CLBR_EDX (1 << 2)
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#define CLBR_EDI (1 << 3)
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#ifdef CONFIG_X86_32
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/* CLBR_ANY should match all regs platform has. For i386, that's just it */
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#define CLBR_ANY ((1 << 4) - 1)
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#define CLBR_ARG_REGS (CLBR_EAX | CLBR_EDX | CLBR_ECX)
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#define CLBR_RET_REG (CLBR_EAX | CLBR_EDX)
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#define CLBR_SCRATCH (0)
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#else
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#define CLBR_RAX CLBR_EAX
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#define CLBR_RCX CLBR_ECX
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#define CLBR_RDX CLBR_EDX
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#define CLBR_RDI CLBR_EDI
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#define CLBR_RSI (1 << 4)
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#define CLBR_R8 (1 << 5)
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#define CLBR_R9 (1 << 6)
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#define CLBR_R10 (1 << 7)
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#define CLBR_R11 (1 << 8)
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#define CLBR_ANY ((1 << 9) - 1)
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#define CLBR_ARG_REGS (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
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CLBR_RCX | CLBR_R8 | CLBR_R9)
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#define CLBR_RET_REG (CLBR_RAX)
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#define CLBR_SCRATCH (CLBR_R10 | CLBR_R11)
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#include <asm/desc_defs.h>
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#endif /* X86_64 */
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#define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
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#include <asm/paravirt_types.h>
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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#include <linux/cpumask.h>
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#include <asm/kmap_types.h>
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#include <asm/desc_defs.h>
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struct page;
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struct thread_struct;
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struct desc_ptr;
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struct tss_struct;
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struct mm_struct;
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struct desc_struct;
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struct task_struct;
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/*
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* Wrapper type for pointers to code which uses the non-standard
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* calling convention. See PV_CALL_SAVE_REGS_THUNK below.
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*/
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struct paravirt_callee_save {
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void *func;
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};
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/* general info */
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struct pv_info {
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unsigned int kernel_rpl;
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int shared_kernel_pmd;
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int paravirt_enabled;
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const char *name;
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};
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struct pv_init_ops {
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/*
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* Patch may replace one of the defined code sequences with
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* arbitrary code, subject to the same register constraints.
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* This generally means the code is not free to clobber any
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* registers other than EAX. The patch function should return
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* the number of bytes of code generated, as we nop pad the
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* rest in generic code.
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*/
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unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
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unsigned long addr, unsigned len);
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/* Basic arch-specific setup */
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void (*arch_setup)(void);
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char *(*memory_setup)(void);
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void (*post_allocator_init)(void);
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/* Print a banner to identify the environment */
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void (*banner)(void);
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};
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struct pv_lazy_ops {
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/* Set deferred update mode, used for batching operations. */
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void (*enter)(void);
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void (*leave)(void);
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};
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struct pv_time_ops {
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void (*time_init)(void);
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/* Set and set time of day */
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unsigned long (*get_wallclock)(void);
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int (*set_wallclock)(unsigned long);
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unsigned long long (*sched_clock)(void);
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unsigned long (*get_tsc_khz)(void);
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};
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struct pv_cpu_ops {
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/* hooks for various privileged instructions */
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unsigned long (*get_debugreg)(int regno);
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void (*set_debugreg)(int regno, unsigned long value);
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void (*clts)(void);
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unsigned long (*read_cr0)(void);
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void (*write_cr0)(unsigned long);
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unsigned long (*read_cr4_safe)(void);
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unsigned long (*read_cr4)(void);
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void (*write_cr4)(unsigned long);
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#ifdef CONFIG_X86_64
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unsigned long (*read_cr8)(void);
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void (*write_cr8)(unsigned long);
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#endif
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/* Segment descriptor handling */
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void (*load_tr_desc)(void);
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void (*load_gdt)(const struct desc_ptr *);
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void (*load_idt)(const struct desc_ptr *);
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void (*store_gdt)(struct desc_ptr *);
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void (*store_idt)(struct desc_ptr *);
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void (*set_ldt)(const void *desc, unsigned entries);
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unsigned long (*store_tr)(void);
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void (*load_tls)(struct thread_struct *t, unsigned int cpu);
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#ifdef CONFIG_X86_64
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void (*load_gs_index)(unsigned int idx);
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#endif
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void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
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const void *desc);
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void (*write_gdt_entry)(struct desc_struct *,
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int entrynum, const void *desc, int size);
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void (*write_idt_entry)(gate_desc *,
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int entrynum, const gate_desc *gate);
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void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
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void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
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void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
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void (*set_iopl_mask)(unsigned mask);
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void (*wbinvd)(void);
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void (*io_delay)(void);
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/* cpuid emulation, mostly so that caps bits can be disabled */
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void (*cpuid)(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx);
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/* MSR, PMC and TSR operations.
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err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
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u64 (*read_msr_amd)(unsigned int msr, int *err);
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u64 (*read_msr)(unsigned int msr, int *err);
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int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
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u64 (*read_tsc)(void);
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u64 (*read_pmc)(int counter);
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unsigned long long (*read_tscp)(unsigned int *aux);
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/*
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* Atomically enable interrupts and return to userspace. This
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* is only ever used to return to 32-bit processes; in a
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* 64-bit kernel, it's used for 32-on-64 compat processes, but
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* never native 64-bit processes. (Jump, not call.)
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*/
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void (*irq_enable_sysexit)(void);
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/*
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* Switch to usermode gs and return to 64-bit usermode using
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* sysret. Only used in 64-bit kernels to return to 64-bit
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* processes. Usermode register state, including %rsp, must
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* already be restored.
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*/
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void (*usergs_sysret64)(void);
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/*
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* Switch to usermode gs and return to 32-bit usermode using
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* sysret. Used to return to 32-on-64 compat processes.
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* Other usermode register state, including %esp, must already
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* be restored.
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*/
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void (*usergs_sysret32)(void);
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/* Normal iret. Jump to this with the standard iret stack
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frame set up. */
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void (*iret)(void);
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void (*swapgs)(void);
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void (*start_context_switch)(struct task_struct *prev);
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void (*end_context_switch)(struct task_struct *next);
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};
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struct pv_irq_ops {
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void (*init_IRQ)(void);
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/*
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* Get/set interrupt state. save_fl and restore_fl are only
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* expected to use X86_EFLAGS_IF; all other bits
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* returned from save_fl are undefined, and may be ignored by
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* restore_fl.
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*
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* NOTE: These functions callers expect the callee to preserve
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* more registers than the standard C calling convention.
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*/
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struct paravirt_callee_save save_fl;
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struct paravirt_callee_save restore_fl;
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struct paravirt_callee_save irq_disable;
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struct paravirt_callee_save irq_enable;
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void (*safe_halt)(void);
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void (*halt)(void);
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#ifdef CONFIG_X86_64
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void (*adjust_exception_frame)(void);
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#endif
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};
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struct pv_apic_ops {
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#ifdef CONFIG_X86_LOCAL_APIC
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void (*setup_boot_clock)(void);
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void (*setup_secondary_clock)(void);
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void (*startup_ipi_hook)(int phys_apicid,
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unsigned long start_eip,
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unsigned long start_esp);
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#endif
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};
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struct pv_mmu_ops {
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/*
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* Called before/after init_mm pagetable setup. setup_start
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* may reset %cr3, and may pre-install parts of the pagetable;
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* pagetable setup is expected to preserve any existing
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* mapping.
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*/
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void (*pagetable_setup_start)(pgd_t *pgd_base);
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void (*pagetable_setup_done)(pgd_t *pgd_base);
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unsigned long (*read_cr2)(void);
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void (*write_cr2)(unsigned long);
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unsigned long (*read_cr3)(void);
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void (*write_cr3)(unsigned long);
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/*
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* Hooks for intercepting the creation/use/destruction of an
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* mm_struct.
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*/
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void (*activate_mm)(struct mm_struct *prev,
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struct mm_struct *next);
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void (*dup_mmap)(struct mm_struct *oldmm,
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struct mm_struct *mm);
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void (*exit_mmap)(struct mm_struct *mm);
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/* TLB operations */
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void (*flush_tlb_user)(void);
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void (*flush_tlb_kernel)(void);
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void (*flush_tlb_single)(unsigned long addr);
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void (*flush_tlb_others)(const struct cpumask *cpus,
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struct mm_struct *mm,
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unsigned long va);
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/* Hooks for allocating and freeing a pagetable top-level */
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int (*pgd_alloc)(struct mm_struct *mm);
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void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
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/*
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* Hooks for allocating/releasing pagetable pages when they're
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* attached to a pagetable
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*/
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void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
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void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
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void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);
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void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
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void (*release_pte)(unsigned long pfn);
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void (*release_pmd)(unsigned long pfn);
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void (*release_pud)(unsigned long pfn);
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/* Pagetable manipulation functions */
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void (*set_pte)(pte_t *ptep, pte_t pteval);
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void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval);
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void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
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void (*pte_update)(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep);
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void (*pte_update_defer)(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep);
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pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep);
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void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte);
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struct paravirt_callee_save pte_val;
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struct paravirt_callee_save make_pte;
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struct paravirt_callee_save pgd_val;
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struct paravirt_callee_save make_pgd;
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#if PAGETABLE_LEVELS >= 3
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#ifdef CONFIG_X86_PAE
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void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
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void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep);
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void (*pmd_clear)(pmd_t *pmdp);
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#endif /* CONFIG_X86_PAE */
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void (*set_pud)(pud_t *pudp, pud_t pudval);
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struct paravirt_callee_save pmd_val;
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struct paravirt_callee_save make_pmd;
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#if PAGETABLE_LEVELS == 4
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struct paravirt_callee_save pud_val;
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struct paravirt_callee_save make_pud;
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void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
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#endif /* PAGETABLE_LEVELS == 4 */
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#endif /* PAGETABLE_LEVELS >= 3 */
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#ifdef CONFIG_HIGHPTE
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void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
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#endif
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struct pv_lazy_ops lazy_mode;
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/* dom0 ops */
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/* Sometimes the physical address is a pfn, and sometimes its
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an mfn. We can tell which is which from the index. */
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void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
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phys_addr_t phys, pgprot_t flags);
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};
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struct raw_spinlock;
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struct pv_lock_ops {
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int (*spin_is_locked)(struct raw_spinlock *lock);
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int (*spin_is_contended)(struct raw_spinlock *lock);
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void (*spin_lock)(struct raw_spinlock *lock);
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void (*spin_lock_flags)(struct raw_spinlock *lock, unsigned long flags);
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int (*spin_trylock)(struct raw_spinlock *lock);
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void (*spin_unlock)(struct raw_spinlock *lock);
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};
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/* This contains all the paravirt structures: we get a convenient
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* number for each function using the offset which we use to indicate
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* what to patch. */
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struct paravirt_patch_template {
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struct pv_init_ops pv_init_ops;
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struct pv_time_ops pv_time_ops;
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struct pv_cpu_ops pv_cpu_ops;
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struct pv_irq_ops pv_irq_ops;
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struct pv_apic_ops pv_apic_ops;
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struct pv_mmu_ops pv_mmu_ops;
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struct pv_lock_ops pv_lock_ops;
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};
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extern struct pv_info pv_info;
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extern struct pv_init_ops pv_init_ops;
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extern struct pv_time_ops pv_time_ops;
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extern struct pv_cpu_ops pv_cpu_ops;
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extern struct pv_irq_ops pv_irq_ops;
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extern struct pv_apic_ops pv_apic_ops;
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extern struct pv_mmu_ops pv_mmu_ops;
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extern struct pv_lock_ops pv_lock_ops;
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#define PARAVIRT_PATCH(x) \
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(offsetof(struct paravirt_patch_template, x) / sizeof(void *))
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#define paravirt_type(op) \
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[paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
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[paravirt_opptr] "i" (&(op))
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#define paravirt_clobber(clobber) \
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[paravirt_clobber] "i" (clobber)
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/*
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* Generate some code, and mark it as patchable by the
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* apply_paravirt() alternate instruction patcher.
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*/
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#define _paravirt_alt(insn_string, type, clobber) \
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"771:\n\t" insn_string "\n" "772:\n" \
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".pushsection .parainstructions,\"a\"\n" \
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_ASM_ALIGN "\n" \
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_ASM_PTR " 771b\n" \
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" .byte " type "\n" \
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" .byte 772b-771b\n" \
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" .short " clobber "\n" \
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".popsection\n"
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/* Generate patchable code, with the default asm parameters. */
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#define paravirt_alt(insn_string) \
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_paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
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/* Simple instruction patching code. */
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#define DEF_NATIVE(ops, name, code) \
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extern const char start_##ops##_##name[], end_##ops##_##name[]; \
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asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
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unsigned paravirt_patch_nop(void);
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unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
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unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
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unsigned paravirt_patch_ignore(unsigned len);
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unsigned paravirt_patch_call(void *insnbuf,
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const void *target, u16 tgt_clobbers,
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unsigned long addr, u16 site_clobbers,
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unsigned len);
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unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
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unsigned long addr, unsigned len);
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unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
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unsigned long addr, unsigned len);
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unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
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const char *start, const char *end);
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unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
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unsigned long addr, unsigned len);
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int paravirt_disable_iospace(void);
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/*
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* This generates an indirect call based on the operation type number.
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* The type number, computed in PARAVIRT_PATCH, is derived from the
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* offset into the paravirt_patch_template structure, and can therefore be
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* freely converted back into a structure offset.
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*/
|
||||
#define PARAVIRT_CALL "call *%c[paravirt_opptr];"
|
||||
|
||||
/*
|
||||
* These macros are intended to wrap calls through one of the paravirt
|
||||
* ops structs, so that they can be later identified and patched at
|
||||
* runtime.
|
||||
*
|
||||
* Normally, a call to a pv_op function is a simple indirect call:
|
||||
* (pv_op_struct.operations)(args...).
|
||||
*
|
||||
* Unfortunately, this is a relatively slow operation for modern CPUs,
|
||||
* because it cannot necessarily determine what the destination
|
||||
* address is. In this case, the address is a runtime constant, so at
|
||||
* the very least we can patch the call to e a simple direct call, or
|
||||
* ideally, patch an inline implementation into the callsite. (Direct
|
||||
* calls are essentially free, because the call and return addresses
|
||||
* are completely predictable.)
|
||||
*
|
||||
* For i386, these macros rely on the standard gcc "regparm(3)" calling
|
||||
* convention, in which the first three arguments are placed in %eax,
|
||||
* %edx, %ecx (in that order), and the remaining arguments are placed
|
||||
* on the stack. All caller-save registers (eax,edx,ecx) are expected
|
||||
* to be modified (either clobbered or used for return values).
|
||||
* X86_64, on the other hand, already specifies a register-based calling
|
||||
* conventions, returning at %rax, with parameteres going on %rdi, %rsi,
|
||||
* %rdx, and %rcx. Note that for this reason, x86_64 does not need any
|
||||
* special handling for dealing with 4 arguments, unlike i386.
|
||||
* However, x86_64 also have to clobber all caller saved registers, which
|
||||
* unfortunately, are quite a bit (r8 - r11)
|
||||
*
|
||||
* The call instruction itself is marked by placing its start address
|
||||
* and size into the .parainstructions section, so that
|
||||
* apply_paravirt() in arch/i386/kernel/alternative.c can do the
|
||||
* appropriate patching under the control of the backend pv_init_ops
|
||||
* implementation.
|
||||
*
|
||||
* Unfortunately there's no way to get gcc to generate the args setup
|
||||
* for the call, and then allow the call itself to be generated by an
|
||||
* inline asm. Because of this, we must do the complete arg setup and
|
||||
* return value handling from within these macros. This is fairly
|
||||
* cumbersome.
|
||||
*
|
||||
* There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
|
||||
* It could be extended to more arguments, but there would be little
|
||||
* to be gained from that. For each number of arguments, there are
|
||||
* the two VCALL and CALL variants for void and non-void functions.
|
||||
*
|
||||
* When there is a return value, the invoker of the macro must specify
|
||||
* the return type. The macro then uses sizeof() on that type to
|
||||
* determine whether its a 32 or 64 bit value, and places the return
|
||||
* in the right register(s) (just %eax for 32-bit, and %edx:%eax for
|
||||
* 64-bit). For x86_64 machines, it just returns at %rax regardless of
|
||||
* the return value size.
|
||||
*
|
||||
* 64-bit arguments are passed as a pair of adjacent 32-bit arguments
|
||||
* i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
|
||||
* in low,high order
|
||||
*
|
||||
* Small structures are passed and returned in registers. The macro
|
||||
* calling convention can't directly deal with this, so the wrapper
|
||||
* functions must do this.
|
||||
*
|
||||
* These PVOP_* macros are only defined within this header. This
|
||||
* means that all uses must be wrapped in inline functions. This also
|
||||
* makes sure the incoming and outgoing types are always correct.
|
||||
*/
|
||||
#ifdef CONFIG_X86_32
|
||||
#define PVOP_VCALL_ARGS \
|
||||
unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
|
||||
#define PVOP_CALL_ARGS PVOP_VCALL_ARGS
|
||||
|
||||
#define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
|
||||
|
||||
#define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
|
||||
"=c" (__ecx)
|
||||
#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
|
||||
|
||||
#define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
|
||||
#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
|
||||
|
||||
#define EXTRA_CLOBBERS
|
||||
#define VEXTRA_CLOBBERS
|
||||
#else /* CONFIG_X86_64 */
|
||||
#define PVOP_VCALL_ARGS \
|
||||
unsigned long __edi = __edi, __esi = __esi, \
|
||||
__edx = __edx, __ecx = __ecx
|
||||
#define PVOP_CALL_ARGS PVOP_VCALL_ARGS, __eax
|
||||
|
||||
#define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
|
||||
|
||||
#define PVOP_VCALL_CLOBBERS "=D" (__edi), \
|
||||
"=S" (__esi), "=d" (__edx), \
|
||||
"=c" (__ecx)
|
||||
#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
|
||||
|
||||
#define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
|
||||
#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
|
||||
|
||||
#define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
|
||||
#define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
|
||||
#endif /* CONFIG_X86_32 */
|
||||
|
||||
#ifdef CONFIG_PARAVIRT_DEBUG
|
||||
#define PVOP_TEST_NULL(op) BUG_ON(op == NULL)
|
||||
#else
|
||||
#define PVOP_TEST_NULL(op) ((void)op)
|
||||
#endif
|
||||
|
||||
#define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \
|
||||
pre, post, ...) \
|
||||
({ \
|
||||
rettype __ret; \
|
||||
PVOP_CALL_ARGS; \
|
||||
PVOP_TEST_NULL(op); \
|
||||
/* This is 32-bit specific, but is okay in 64-bit */ \
|
||||
/* since this condition will never hold */ \
|
||||
if (sizeof(rettype) > sizeof(unsigned long)) { \
|
||||
asm volatile(pre \
|
||||
paravirt_alt(PARAVIRT_CALL) \
|
||||
post \
|
||||
: call_clbr \
|
||||
: paravirt_type(op), \
|
||||
paravirt_clobber(clbr), \
|
||||
##__VA_ARGS__ \
|
||||
: "memory", "cc" extra_clbr); \
|
||||
__ret = (rettype)((((u64)__edx) << 32) | __eax); \
|
||||
} else { \
|
||||
asm volatile(pre \
|
||||
paravirt_alt(PARAVIRT_CALL) \
|
||||
post \
|
||||
: call_clbr \
|
||||
: paravirt_type(op), \
|
||||
paravirt_clobber(clbr), \
|
||||
##__VA_ARGS__ \
|
||||
: "memory", "cc" extra_clbr); \
|
||||
__ret = (rettype)__eax; \
|
||||
} \
|
||||
__ret; \
|
||||
})
|
||||
|
||||
#define __PVOP_CALL(rettype, op, pre, post, ...) \
|
||||
____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \
|
||||
EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
|
||||
|
||||
#define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \
|
||||
____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
|
||||
PVOP_CALLEE_CLOBBERS, , \
|
||||
pre, post, ##__VA_ARGS__)
|
||||
|
||||
|
||||
#define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
|
||||
({ \
|
||||
PVOP_VCALL_ARGS; \
|
||||
PVOP_TEST_NULL(op); \
|
||||
asm volatile(pre \
|
||||
paravirt_alt(PARAVIRT_CALL) \
|
||||
post \
|
||||
: call_clbr \
|
||||
: paravirt_type(op), \
|
||||
paravirt_clobber(clbr), \
|
||||
##__VA_ARGS__ \
|
||||
: "memory", "cc" extra_clbr); \
|
||||
})
|
||||
|
||||
#define __PVOP_VCALL(op, pre, post, ...) \
|
||||
____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
|
||||
VEXTRA_CLOBBERS, \
|
||||
pre, post, ##__VA_ARGS__)
|
||||
|
||||
#define __PVOP_VCALLEESAVE(rettype, op, pre, post, ...) \
|
||||
____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
|
||||
PVOP_VCALLEE_CLOBBERS, , \
|
||||
pre, post, ##__VA_ARGS__)
|
||||
|
||||
|
||||
|
||||
#define PVOP_CALL0(rettype, op) \
|
||||
__PVOP_CALL(rettype, op, "", "")
|
||||
#define PVOP_VCALL0(op) \
|
||||
__PVOP_VCALL(op, "", "")
|
||||
|
||||
#define PVOP_CALLEE0(rettype, op) \
|
||||
__PVOP_CALLEESAVE(rettype, op, "", "")
|
||||
#define PVOP_VCALLEE0(op) \
|
||||
__PVOP_VCALLEESAVE(op, "", "")
|
||||
|
||||
|
||||
#define PVOP_CALL1(rettype, op, arg1) \
|
||||
__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
|
||||
#define PVOP_VCALL1(op, arg1) \
|
||||
__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
|
||||
|
||||
#define PVOP_CALLEE1(rettype, op, arg1) \
|
||||
__PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
|
||||
#define PVOP_VCALLEE1(op, arg1) \
|
||||
__PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
|
||||
|
||||
|
||||
#define PVOP_CALL2(rettype, op, arg1, arg2) \
|
||||
__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2))
|
||||
#define PVOP_VCALL2(op, arg1, arg2) \
|
||||
__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2))
|
||||
|
||||
#define PVOP_CALLEE2(rettype, op, arg1, arg2) \
|
||||
__PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2))
|
||||
#define PVOP_VCALLEE2(op, arg1, arg2) \
|
||||
__PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2))
|
||||
|
||||
|
||||
#define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
|
||||
__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
|
||||
#define PVOP_VCALL3(op, arg1, arg2, arg3) \
|
||||
__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
|
||||
|
||||
/* This is the only difference in x86_64. We can make it much simpler */
|
||||
#ifdef CONFIG_X86_32
|
||||
#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
|
||||
__PVOP_CALL(rettype, op, \
|
||||
"push %[_arg4];", "lea 4(%%esp),%%esp;", \
|
||||
PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
|
||||
PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
|
||||
#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
|
||||
__PVOP_VCALL(op, \
|
||||
"push %[_arg4];", "lea 4(%%esp),%%esp;", \
|
||||
"0" ((u32)(arg1)), "1" ((u32)(arg2)), \
|
||||
"2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
|
||||
#else
|
||||
#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
|
||||
__PVOP_CALL(rettype, op, "", "", \
|
||||
PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
|
||||
PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
|
||||
#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
|
||||
__PVOP_VCALL(op, "", "", \
|
||||
PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
|
||||
PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
|
||||
#endif
|
||||
|
||||
static inline int paravirt_enabled(void)
|
||||
{
|
||||
@ -1393,20 +715,6 @@ static inline void pmd_clear(pmd_t *pmdp)
|
||||
}
|
||||
#endif /* CONFIG_X86_PAE */
|
||||
|
||||
/* Lazy mode for batching updates / context switch */
|
||||
enum paravirt_lazy_mode {
|
||||
PARAVIRT_LAZY_NONE,
|
||||
PARAVIRT_LAZY_MMU,
|
||||
PARAVIRT_LAZY_CPU,
|
||||
};
|
||||
|
||||
enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
|
||||
void paravirt_start_context_switch(struct task_struct *prev);
|
||||
void paravirt_end_context_switch(struct task_struct *next);
|
||||
|
||||
void paravirt_enter_lazy_mmu(void);
|
||||
void paravirt_leave_lazy_mmu(void);
|
||||
|
||||
#define __HAVE_ARCH_START_CONTEXT_SWITCH
|
||||
static inline void arch_start_context_switch(struct task_struct *prev)
|
||||
{
|
||||
@ -1437,12 +745,6 @@ static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
|
||||
pv_mmu_ops.set_fixmap(idx, phys, flags);
|
||||
}
|
||||
|
||||
void _paravirt_nop(void);
|
||||
u32 _paravirt_ident_32(u32);
|
||||
u64 _paravirt_ident_64(u64);
|
||||
|
||||
#define paravirt_nop ((void *)_paravirt_nop)
|
||||
|
||||
#if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
|
||||
|
||||
static inline int __raw_spin_is_locked(struct raw_spinlock *lock)
|
||||
@ -1479,17 +781,6 @@ static __always_inline void __raw_spin_unlock(struct raw_spinlock *lock)
|
||||
|
||||
#endif
|
||||
|
||||
/* These all sit in the .parainstructions section to tell us what to patch. */
|
||||
struct paravirt_patch_site {
|
||||
u8 *instr; /* original instructions */
|
||||
u8 instrtype; /* type of this instruction */
|
||||
u8 len; /* length of original instruction */
|
||||
u16 clobbers; /* what registers you may clobber */
|
||||
};
|
||||
|
||||
extern struct paravirt_patch_site __parainstructions[],
|
||||
__parainstructions_end[];
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
#define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
|
||||
#define PV_RESTORE_REGS "popl %edx; popl %ecx;"
|
||||
|
||||
720
arch/x86/include/asm/paravirt_types.h
Normal file
720
arch/x86/include/asm/paravirt_types.h
Normal file
@ -0,0 +1,720 @@
|
||||
#ifndef _ASM_X86_PARAVIRT_TYPES_H
|
||||
#define _ASM_X86_PARAVIRT_TYPES_H
|
||||
|
||||
/* Bitmask of what can be clobbered: usually at least eax. */
|
||||
#define CLBR_NONE 0
|
||||
#define CLBR_EAX (1 << 0)
|
||||
#define CLBR_ECX (1 << 1)
|
||||
#define CLBR_EDX (1 << 2)
|
||||
#define CLBR_EDI (1 << 3)
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
/* CLBR_ANY should match all regs platform has. For i386, that's just it */
|
||||
#define CLBR_ANY ((1 << 4) - 1)
|
||||
|
||||
#define CLBR_ARG_REGS (CLBR_EAX | CLBR_EDX | CLBR_ECX)
|
||||
#define CLBR_RET_REG (CLBR_EAX | CLBR_EDX)
|
||||
#define CLBR_SCRATCH (0)
|
||||
#else
|
||||
#define CLBR_RAX CLBR_EAX
|
||||
#define CLBR_RCX CLBR_ECX
|
||||
#define CLBR_RDX CLBR_EDX
|
||||
#define CLBR_RDI CLBR_EDI
|
||||
#define CLBR_RSI (1 << 4)
|
||||
#define CLBR_R8 (1 << 5)
|
||||
#define CLBR_R9 (1 << 6)
|
||||
#define CLBR_R10 (1 << 7)
|
||||
#define CLBR_R11 (1 << 8)
|
||||
|
||||
#define CLBR_ANY ((1 << 9) - 1)
|
||||
|
||||
#define CLBR_ARG_REGS (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
|
||||
CLBR_RCX | CLBR_R8 | CLBR_R9)
|
||||
#define CLBR_RET_REG (CLBR_RAX)
|
||||
#define CLBR_SCRATCH (CLBR_R10 | CLBR_R11)
|
||||
|
||||
#endif /* X86_64 */
|
||||
|
||||
#define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
|
||||
#include <asm/desc_defs.h>
|
||||
#include <asm/kmap_types.h>
|
||||
|
||||
struct page;
|
||||
struct thread_struct;
|
||||
struct desc_ptr;
|
||||
struct tss_struct;
|
||||
struct mm_struct;
|
||||
struct desc_struct;
|
||||
struct task_struct;
|
||||
struct cpumask;
|
||||
|
||||
/*
|
||||
* Wrapper type for pointers to code which uses the non-standard
|
||||
* calling convention. See PV_CALL_SAVE_REGS_THUNK below.
|
||||
*/
|
||||
struct paravirt_callee_save {
|
||||
void *func;
|
||||
};
|
||||
|
||||
/* general info */
|
||||
struct pv_info {
|
||||
unsigned int kernel_rpl;
|
||||
int shared_kernel_pmd;
|
||||
int paravirt_enabled;
|
||||
const char *name;
|
||||
};
|
||||
|
||||
struct pv_init_ops {
|
||||
/*
|
||||
* Patch may replace one of the defined code sequences with
|
||||
* arbitrary code, subject to the same register constraints.
|
||||
* This generally means the code is not free to clobber any
|
||||
* registers other than EAX. The patch function should return
|
||||
* the number of bytes of code generated, as we nop pad the
|
||||
* rest in generic code.
|
||||
*/
|
||||
unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
|
||||
unsigned long addr, unsigned len);
|
||||
|
||||
/* Basic arch-specific setup */
|
||||
void (*arch_setup)(void);
|
||||
char *(*memory_setup)(void);
|
||||
void (*post_allocator_init)(void);
|
||||
|
||||
/* Print a banner to identify the environment */
|
||||
void (*banner)(void);
|
||||
};
|
||||
|
||||
|
||||
struct pv_lazy_ops {
|
||||
/* Set deferred update mode, used for batching operations. */
|
||||
void (*enter)(void);
|
||||
void (*leave)(void);
|
||||
};
|
||||
|
||||
struct pv_time_ops {
|
||||
void (*time_init)(void);
|
||||
|
||||
/* Set and set time of day */
|
||||
unsigned long (*get_wallclock)(void);
|
||||
int (*set_wallclock)(unsigned long);
|
||||
|
||||
unsigned long long (*sched_clock)(void);
|
||||
unsigned long (*get_tsc_khz)(void);
|
||||
};
|
||||
|
||||
struct pv_cpu_ops {
|
||||
/* hooks for various privileged instructions */
|
||||
unsigned long (*get_debugreg)(int regno);
|
||||
void (*set_debugreg)(int regno, unsigned long value);
|
||||
|
||||
void (*clts)(void);
|
||||
|
||||
unsigned long (*read_cr0)(void);
|
||||
void (*write_cr0)(unsigned long);
|
||||
|
||||
unsigned long (*read_cr4_safe)(void);
|
||||
unsigned long (*read_cr4)(void);
|
||||
void (*write_cr4)(unsigned long);
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
unsigned long (*read_cr8)(void);
|
||||
void (*write_cr8)(unsigned long);
|
||||
#endif
|
||||
|
||||
/* Segment descriptor handling */
|
||||
void (*load_tr_desc)(void);
|
||||
void (*load_gdt)(const struct desc_ptr *);
|
||||
void (*load_idt)(const struct desc_ptr *);
|
||||
void (*store_gdt)(struct desc_ptr *);
|
||||
void (*store_idt)(struct desc_ptr *);
|
||||
void (*set_ldt)(const void *desc, unsigned entries);
|
||||
unsigned long (*store_tr)(void);
|
||||
void (*load_tls)(struct thread_struct *t, unsigned int cpu);
|
||||
#ifdef CONFIG_X86_64
|
||||
void (*load_gs_index)(unsigned int idx);
|
||||
#endif
|
||||
void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
|
||||
const void *desc);
|
||||
void (*write_gdt_entry)(struct desc_struct *,
|
||||
int entrynum, const void *desc, int size);
|
||||
void (*write_idt_entry)(gate_desc *,
|
||||
int entrynum, const gate_desc *gate);
|
||||
void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
|
||||
void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
|
||||
|
||||
void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
|
||||
|
||||
void (*set_iopl_mask)(unsigned mask);
|
||||
|
||||
void (*wbinvd)(void);
|
||||
void (*io_delay)(void);
|
||||
|
||||
/* cpuid emulation, mostly so that caps bits can be disabled */
|
||||
void (*cpuid)(unsigned int *eax, unsigned int *ebx,
|
||||
unsigned int *ecx, unsigned int *edx);
|
||||
|
||||
/* MSR, PMC and TSR operations.
|
||||
err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
|
||||
u64 (*read_msr_amd)(unsigned int msr, int *err);
|
||||
u64 (*read_msr)(unsigned int msr, int *err);
|
||||
int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
|
||||
|
||||
u64 (*read_tsc)(void);
|
||||
u64 (*read_pmc)(int counter);
|
||||
unsigned long long (*read_tscp)(unsigned int *aux);
|
||||
|
||||
/*
|
||||
* Atomically enable interrupts and return to userspace. This
|
||||
* is only ever used to return to 32-bit processes; in a
|
||||
* 64-bit kernel, it's used for 32-on-64 compat processes, but
|
||||
* never native 64-bit processes. (Jump, not call.)
|
||||
*/
|
||||
void (*irq_enable_sysexit)(void);
|
||||
|
||||
/*
|
||||
* Switch to usermode gs and return to 64-bit usermode using
|
||||
* sysret. Only used in 64-bit kernels to return to 64-bit
|
||||
* processes. Usermode register state, including %rsp, must
|
||||
* already be restored.
|
||||
*/
|
||||
void (*usergs_sysret64)(void);
|
||||
|
||||
/*
|
||||
* Switch to usermode gs and return to 32-bit usermode using
|
||||
* sysret. Used to return to 32-on-64 compat processes.
|
||||
* Other usermode register state, including %esp, must already
|
||||
* be restored.
|
||||
*/
|
||||
void (*usergs_sysret32)(void);
|
||||
|
||||
/* Normal iret. Jump to this with the standard iret stack
|
||||
frame set up. */
|
||||
void (*iret)(void);
|
||||
|
||||
void (*swapgs)(void);
|
||||
|
||||
void (*start_context_switch)(struct task_struct *prev);
|
||||
void (*end_context_switch)(struct task_struct *next);
|
||||
};
|
||||
|
||||
struct pv_irq_ops {
|
||||
void (*init_IRQ)(void);
|
||||
|
||||
/*
|
||||
* Get/set interrupt state. save_fl and restore_fl are only
|
||||
* expected to use X86_EFLAGS_IF; all other bits
|
||||
* returned from save_fl are undefined, and may be ignored by
|
||||
* restore_fl.
|
||||
*
|
||||
* NOTE: These functions callers expect the callee to preserve
|
||||
* more registers than the standard C calling convention.
|
||||
*/
|
||||
struct paravirt_callee_save save_fl;
|
||||
struct paravirt_callee_save restore_fl;
|
||||
struct paravirt_callee_save irq_disable;
|
||||
struct paravirt_callee_save irq_enable;
|
||||
|
||||
void (*safe_halt)(void);
|
||||
void (*halt)(void);
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
void (*adjust_exception_frame)(void);
|
||||
#endif
|
||||
};
|
||||
|
||||
struct pv_apic_ops {
|
||||
#ifdef CONFIG_X86_LOCAL_APIC
|
||||
void (*setup_boot_clock)(void);
|
||||
void (*setup_secondary_clock)(void);
|
||||
|
||||
void (*startup_ipi_hook)(int phys_apicid,
|
||||
unsigned long start_eip,
|
||||
unsigned long start_esp);
|
||||
#endif
|
||||
};
|
||||
|
||||
struct pv_mmu_ops {
|
||||
/*
|
||||
* Called before/after init_mm pagetable setup. setup_start
|
||||
* may reset %cr3, and may pre-install parts of the pagetable;
|
||||
* pagetable setup is expected to preserve any existing
|
||||
* mapping.
|
||||
*/
|
||||
void (*pagetable_setup_start)(pgd_t *pgd_base);
|
||||
void (*pagetable_setup_done)(pgd_t *pgd_base);
|
||||
|
||||
unsigned long (*read_cr2)(void);
|
||||
void (*write_cr2)(unsigned long);
|
||||
|
||||
unsigned long (*read_cr3)(void);
|
||||
void (*write_cr3)(unsigned long);
|
||||
|
||||
/*
|
||||
* Hooks for intercepting the creation/use/destruction of an
|
||||
* mm_struct.
|
||||
*/
|
||||
void (*activate_mm)(struct mm_struct *prev,
|
||||
struct mm_struct *next);
|
||||
void (*dup_mmap)(struct mm_struct *oldmm,
|
||||
struct mm_struct *mm);
|
||||
void (*exit_mmap)(struct mm_struct *mm);
|
||||
|
||||
|
||||
/* TLB operations */
|
||||
void (*flush_tlb_user)(void);
|
||||
void (*flush_tlb_kernel)(void);
|
||||
void (*flush_tlb_single)(unsigned long addr);
|
||||
void (*flush_tlb_others)(const struct cpumask *cpus,
|
||||
struct mm_struct *mm,
|
||||
unsigned long va);
|
||||
|
||||
/* Hooks for allocating and freeing a pagetable top-level */
|
||||
int (*pgd_alloc)(struct mm_struct *mm);
|
||||
void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
|
||||
|
||||
/*
|
||||
* Hooks for allocating/releasing pagetable pages when they're
|
||||
* attached to a pagetable
|
||||
*/
|
||||
void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
|
||||
void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
|
||||
void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);
|
||||
void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
|
||||
void (*release_pte)(unsigned long pfn);
|
||||
void (*release_pmd)(unsigned long pfn);
|
||||
void (*release_pud)(unsigned long pfn);
|
||||
|
||||
/* Pagetable manipulation functions */
|
||||
void (*set_pte)(pte_t *ptep, pte_t pteval);
|
||||
void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t pteval);
|
||||
void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
|
||||
void (*pte_update)(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep);
|
||||
void (*pte_update_defer)(struct mm_struct *mm,
|
||||
unsigned long addr, pte_t *ptep);
|
||||
|
||||
pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep);
|
||||
void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t pte);
|
||||
|
||||
struct paravirt_callee_save pte_val;
|
||||
struct paravirt_callee_save make_pte;
|
||||
|
||||
struct paravirt_callee_save pgd_val;
|
||||
struct paravirt_callee_save make_pgd;
|
||||
|
||||
#if PAGETABLE_LEVELS >= 3
|
||||
#ifdef CONFIG_X86_PAE
|
||||
void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
|
||||
void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep);
|
||||
void (*pmd_clear)(pmd_t *pmdp);
|
||||
|
||||
#endif /* CONFIG_X86_PAE */
|
||||
|
||||
void (*set_pud)(pud_t *pudp, pud_t pudval);
|
||||
|
||||
struct paravirt_callee_save pmd_val;
|
||||
struct paravirt_callee_save make_pmd;
|
||||
|
||||
#if PAGETABLE_LEVELS == 4
|
||||
struct paravirt_callee_save pud_val;
|
||||
struct paravirt_callee_save make_pud;
|
||||
|
||||
void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
|
||||
#endif /* PAGETABLE_LEVELS == 4 */
|
||||
#endif /* PAGETABLE_LEVELS >= 3 */
|
||||
|
||||
#ifdef CONFIG_HIGHPTE
|
||||
void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
|
||||
#endif
|
||||
|
||||
struct pv_lazy_ops lazy_mode;
|
||||
|
||||
/* dom0 ops */
|
||||
|
||||
/* Sometimes the physical address is a pfn, and sometimes its
|
||||
an mfn. We can tell which is which from the index. */
|
||||
void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
|
||||
phys_addr_t phys, pgprot_t flags);
|
||||
};
|
||||
|
||||
struct raw_spinlock;
|
||||
struct pv_lock_ops {
|
||||
int (*spin_is_locked)(struct raw_spinlock *lock);
|
||||
int (*spin_is_contended)(struct raw_spinlock *lock);
|
||||
void (*spin_lock)(struct raw_spinlock *lock);
|
||||
void (*spin_lock_flags)(struct raw_spinlock *lock, unsigned long flags);
|
||||
int (*spin_trylock)(struct raw_spinlock *lock);
|
||||
void (*spin_unlock)(struct raw_spinlock *lock);
|
||||
};
|
||||
|
||||
/* This contains all the paravirt structures: we get a convenient
|
||||
* number for each function using the offset which we use to indicate
|
||||
* what to patch. */
|
||||
struct paravirt_patch_template {
|
||||
struct pv_init_ops pv_init_ops;
|
||||
struct pv_time_ops pv_time_ops;
|
||||
struct pv_cpu_ops pv_cpu_ops;
|
||||
struct pv_irq_ops pv_irq_ops;
|
||||
struct pv_apic_ops pv_apic_ops;
|
||||
struct pv_mmu_ops pv_mmu_ops;
|
||||
struct pv_lock_ops pv_lock_ops;
|
||||
};
|
||||
|
||||
extern struct pv_info pv_info;
|
||||
extern struct pv_init_ops pv_init_ops;
|
||||
extern struct pv_time_ops pv_time_ops;
|
||||
extern struct pv_cpu_ops pv_cpu_ops;
|
||||
extern struct pv_irq_ops pv_irq_ops;
|
||||
extern struct pv_apic_ops pv_apic_ops;
|
||||
extern struct pv_mmu_ops pv_mmu_ops;
|
||||
extern struct pv_lock_ops pv_lock_ops;
|
||||
|
||||
#define PARAVIRT_PATCH(x) \
|
||||
(offsetof(struct paravirt_patch_template, x) / sizeof(void *))
|
||||
|
||||
#define paravirt_type(op) \
|
||||
[paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
|
||||
[paravirt_opptr] "i" (&(op))
|
||||
#define paravirt_clobber(clobber) \
|
||||
[paravirt_clobber] "i" (clobber)
|
||||
|
||||
/*
|
||||
* Generate some code, and mark it as patchable by the
|
||||
* apply_paravirt() alternate instruction patcher.
|
||||
*/
|
||||
#define _paravirt_alt(insn_string, type, clobber) \
|
||||
"771:\n\t" insn_string "\n" "772:\n" \
|
||||
".pushsection .parainstructions,\"a\"\n" \
|
||||
_ASM_ALIGN "\n" \
|
||||
_ASM_PTR " 771b\n" \
|
||||
" .byte " type "\n" \
|
||||
" .byte 772b-771b\n" \
|
||||
" .short " clobber "\n" \
|
||||
".popsection\n"
|
||||
|
||||
/* Generate patchable code, with the default asm parameters. */
|
||||
#define paravirt_alt(insn_string) \
|
||||
_paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
|
||||
|
||||
/* Simple instruction patching code. */
|
||||
#define DEF_NATIVE(ops, name, code) \
|
||||
extern const char start_##ops##_##name[], end_##ops##_##name[]; \
|
||||
asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
|
||||
|
||||
unsigned paravirt_patch_nop(void);
|
||||
unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
|
||||
unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
|
||||
unsigned paravirt_patch_ignore(unsigned len);
|
||||
unsigned paravirt_patch_call(void *insnbuf,
|
||||
const void *target, u16 tgt_clobbers,
|
||||
unsigned long addr, u16 site_clobbers,
|
||||
unsigned len);
|
||||
unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
|
||||
unsigned long addr, unsigned len);
|
||||
unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
|
||||
unsigned long addr, unsigned len);
|
||||
|
||||
unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
|
||||
const char *start, const char *end);
|
||||
|
||||
unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
|
||||
unsigned long addr, unsigned len);
|
||||
|
||||
int paravirt_disable_iospace(void);
|
||||
|
||||
/*
|
||||
* This generates an indirect call based on the operation type number.
|
||||
* The type number, computed in PARAVIRT_PATCH, is derived from the
|
||||
* offset into the paravirt_patch_template structure, and can therefore be
|
||||
* freely converted back into a structure offset.
|
||||
*/
|
||||
#define PARAVIRT_CALL "call *%c[paravirt_opptr];"
|
||||
|
||||
/*
|
||||
* These macros are intended to wrap calls through one of the paravirt
|
||||
* ops structs, so that they can be later identified and patched at
|
||||
* runtime.
|
||||
*
|
||||
* Normally, a call to a pv_op function is a simple indirect call:
|
||||
* (pv_op_struct.operations)(args...).
|
||||
*
|
||||
* Unfortunately, this is a relatively slow operation for modern CPUs,
|
||||
* because it cannot necessarily determine what the destination
|
||||
* address is. In this case, the address is a runtime constant, so at
|
||||
* the very least we can patch the call to e a simple direct call, or
|
||||
* ideally, patch an inline implementation into the callsite. (Direct
|
||||
* calls are essentially free, because the call and return addresses
|
||||
* are completely predictable.)
|
||||
*
|
||||
* For i386, these macros rely on the standard gcc "regparm(3)" calling
|
||||
* convention, in which the first three arguments are placed in %eax,
|
||||
* %edx, %ecx (in that order), and the remaining arguments are placed
|
||||
* on the stack. All caller-save registers (eax,edx,ecx) are expected
|
||||
* to be modified (either clobbered or used for return values).
|
||||
* X86_64, on the other hand, already specifies a register-based calling
|
||||
* conventions, returning at %rax, with parameteres going on %rdi, %rsi,
|
||||
* %rdx, and %rcx. Note that for this reason, x86_64 does not need any
|
||||
* special handling for dealing with 4 arguments, unlike i386.
|
||||
* However, x86_64 also have to clobber all caller saved registers, which
|
||||
* unfortunately, are quite a bit (r8 - r11)
|
||||
*
|
||||
* The call instruction itself is marked by placing its start address
|
||||
* and size into the .parainstructions section, so that
|
||||
* apply_paravirt() in arch/i386/kernel/alternative.c can do the
|
||||
* appropriate patching under the control of the backend pv_init_ops
|
||||
* implementation.
|
||||
*
|
||||
* Unfortunately there's no way to get gcc to generate the args setup
|
||||
* for the call, and then allow the call itself to be generated by an
|
||||
* inline asm. Because of this, we must do the complete arg setup and
|
||||
* return value handling from within these macros. This is fairly
|
||||
* cumbersome.
|
||||
*
|
||||
* There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
|
||||
* It could be extended to more arguments, but there would be little
|
||||
* to be gained from that. For each number of arguments, there are
|
||||
* the two VCALL and CALL variants for void and non-void functions.
|
||||
*
|
||||
* When there is a return value, the invoker of the macro must specify
|
||||
* the return type. The macro then uses sizeof() on that type to
|
||||
* determine whether its a 32 or 64 bit value, and places the return
|
||||
* in the right register(s) (just %eax for 32-bit, and %edx:%eax for
|
||||
* 64-bit). For x86_64 machines, it just returns at %rax regardless of
|
||||
* the return value size.
|
||||
*
|
||||
* 64-bit arguments are passed as a pair of adjacent 32-bit arguments
|
||||
* i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
|
||||
* in low,high order
|
||||
*
|
||||
* Small structures are passed and returned in registers. The macro
|
||||
* calling convention can't directly deal with this, so the wrapper
|
||||
* functions must do this.
|
||||
*
|
||||
* These PVOP_* macros are only defined within this header. This
|
||||
* means that all uses must be wrapped in inline functions. This also
|
||||
* makes sure the incoming and outgoing types are always correct.
|
||||
*/
|
||||
#ifdef CONFIG_X86_32
|
||||
#define PVOP_VCALL_ARGS \
|
||||
unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
|
||||
#define PVOP_CALL_ARGS PVOP_VCALL_ARGS
|
||||
|
||||
#define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
|
||||
|
||||
#define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
|
||||
"=c" (__ecx)
|
||||
#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
|
||||
|
||||
#define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
|
||||
#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
|
||||
|
||||
#define EXTRA_CLOBBERS
|
||||
#define VEXTRA_CLOBBERS
|
||||
#else /* CONFIG_X86_64 */
|
||||
#define PVOP_VCALL_ARGS \
|
||||
unsigned long __edi = __edi, __esi = __esi, \
|
||||
__edx = __edx, __ecx = __ecx
|
||||
#define PVOP_CALL_ARGS PVOP_VCALL_ARGS, __eax
|
||||
|
||||
#define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
|
||||
#define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
|
||||
|
||||
#define PVOP_VCALL_CLOBBERS "=D" (__edi), \
|
||||
"=S" (__esi), "=d" (__edx), \
|
||||
"=c" (__ecx)
|
||||
#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
|
||||
|
||||
#define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
|
||||
#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
|
||||
|
||||
#define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
|
||||
#define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
|
||||
#endif /* CONFIG_X86_32 */
|
||||
|
||||
#ifdef CONFIG_PARAVIRT_DEBUG
|
||||
#define PVOP_TEST_NULL(op) BUG_ON(op == NULL)
|
||||
#else
|
||||
#define PVOP_TEST_NULL(op) ((void)op)
|
||||
#endif
|
||||
|
||||
#define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \
|
||||
pre, post, ...) \
|
||||
({ \
|
||||
rettype __ret; \
|
||||
PVOP_CALL_ARGS; \
|
||||
PVOP_TEST_NULL(op); \
|
||||
/* This is 32-bit specific, but is okay in 64-bit */ \
|
||||
/* since this condition will never hold */ \
|
||||
if (sizeof(rettype) > sizeof(unsigned long)) { \
|
||||
asm volatile(pre \
|
||||
paravirt_alt(PARAVIRT_CALL) \
|
||||
post \
|
||||
: call_clbr \
|
||||
: paravirt_type(op), \
|
||||
paravirt_clobber(clbr), \
|
||||
##__VA_ARGS__ \
|
||||
: "memory", "cc" extra_clbr); \
|
||||
__ret = (rettype)((((u64)__edx) << 32) | __eax); \
|
||||
} else { \
|
||||
asm volatile(pre \
|
||||
paravirt_alt(PARAVIRT_CALL) \
|
||||
post \
|
||||
: call_clbr \
|
||||
: paravirt_type(op), \
|
||||
paravirt_clobber(clbr), \
|
||||
##__VA_ARGS__ \
|
||||
: "memory", "cc" extra_clbr); \
|
||||
__ret = (rettype)__eax; \
|
||||
} \
|
||||
__ret; \
|
||||
})
|
||||
|
||||
#define __PVOP_CALL(rettype, op, pre, post, ...) \
|
||||
____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \
|
||||
EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
|
||||
|
||||
#define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \
|
||||
____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
|
||||
PVOP_CALLEE_CLOBBERS, , \
|
||||
pre, post, ##__VA_ARGS__)
|
||||
|
||||
|
||||
#define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
|
||||
({ \
|
||||
PVOP_VCALL_ARGS; \
|
||||
PVOP_TEST_NULL(op); \
|
||||
asm volatile(pre \
|
||||
paravirt_alt(PARAVIRT_CALL) \
|
||||
post \
|
||||
: call_clbr \
|
||||
: paravirt_type(op), \
|
||||
paravirt_clobber(clbr), \
|
||||
##__VA_ARGS__ \
|
||||
: "memory", "cc" extra_clbr); \
|
||||
})
|
||||
|
||||
#define __PVOP_VCALL(op, pre, post, ...) \
|
||||
____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
|
||||
VEXTRA_CLOBBERS, \
|
||||
pre, post, ##__VA_ARGS__)
|
||||
|
||||
#define __PVOP_VCALLEESAVE(rettype, op, pre, post, ...) \
|
||||
____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
|
||||
PVOP_VCALLEE_CLOBBERS, , \
|
||||
pre, post, ##__VA_ARGS__)
|
||||
|
||||
|
||||
|
||||
#define PVOP_CALL0(rettype, op) \
|
||||
__PVOP_CALL(rettype, op, "", "")
|
||||
#define PVOP_VCALL0(op) \
|
||||
__PVOP_VCALL(op, "", "")
|
||||
|
||||
#define PVOP_CALLEE0(rettype, op) \
|
||||
__PVOP_CALLEESAVE(rettype, op, "", "")
|
||||
#define PVOP_VCALLEE0(op) \
|
||||
__PVOP_VCALLEESAVE(op, "", "")
|
||||
|
||||
|
||||
#define PVOP_CALL1(rettype, op, arg1) \
|
||||
__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
|
||||
#define PVOP_VCALL1(op, arg1) \
|
||||
__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
|
||||
|
||||
#define PVOP_CALLEE1(rettype, op, arg1) \
|
||||
__PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
|
||||
#define PVOP_VCALLEE1(op, arg1) \
|
||||
__PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
|
||||
|
||||
|
||||
#define PVOP_CALL2(rettype, op, arg1, arg2) \
|
||||
__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2))
|
||||
#define PVOP_VCALL2(op, arg1, arg2) \
|
||||
__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2))
|
||||
|
||||
#define PVOP_CALLEE2(rettype, op, arg1, arg2) \
|
||||
__PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2))
|
||||
#define PVOP_VCALLEE2(op, arg1, arg2) \
|
||||
__PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2))
|
||||
|
||||
|
||||
#define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
|
||||
__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
|
||||
#define PVOP_VCALL3(op, arg1, arg2, arg3) \
|
||||
__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
|
||||
PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
|
||||
|
||||
/* This is the only difference in x86_64. We can make it much simpler */
|
||||
#ifdef CONFIG_X86_32
|
||||
#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
|
||||
__PVOP_CALL(rettype, op, \
|
||||
"push %[_arg4];", "lea 4(%%esp),%%esp;", \
|
||||
PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
|
||||
PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
|
||||
#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
|
||||
__PVOP_VCALL(op, \
|
||||
"push %[_arg4];", "lea 4(%%esp),%%esp;", \
|
||||
"0" ((u32)(arg1)), "1" ((u32)(arg2)), \
|
||||
"2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
|
||||
#else
|
||||
#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
|
||||
__PVOP_CALL(rettype, op, "", "", \
|
||||
PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
|
||||
PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
|
||||
#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
|
||||
__PVOP_VCALL(op, "", "", \
|
||||
PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
|
||||
PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
|
||||
#endif
|
||||
|
||||
/* Lazy mode for batching updates / context switch */
|
||||
enum paravirt_lazy_mode {
|
||||
PARAVIRT_LAZY_NONE,
|
||||
PARAVIRT_LAZY_MMU,
|
||||
PARAVIRT_LAZY_CPU,
|
||||
};
|
||||
|
||||
enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
|
||||
void paravirt_start_context_switch(struct task_struct *prev);
|
||||
void paravirt_end_context_switch(struct task_struct *next);
|
||||
|
||||
void paravirt_enter_lazy_mmu(void);
|
||||
void paravirt_leave_lazy_mmu(void);
|
||||
|
||||
void _paravirt_nop(void);
|
||||
u32 _paravirt_ident_32(u32);
|
||||
u64 _paravirt_ident_64(u64);
|
||||
|
||||
#define paravirt_nop ((void *)_paravirt_nop)
|
||||
|
||||
/* These all sit in the .parainstructions section to tell us what to patch. */
|
||||
struct paravirt_patch_site {
|
||||
u8 *instr; /* original instructions */
|
||||
u8 instrtype; /* type of this instruction */
|
||||
u8 len; /* length of original instruction */
|
||||
u16 clobbers; /* what registers you may clobber */
|
||||
};
|
||||
|
||||
extern struct paravirt_patch_site __parainstructions[],
|
||||
__parainstructions_end[];
|
||||
|
||||
#endif /* __ASSEMBLY__ */
|
||||
|
||||
#endif /* _ASM_X86_PARAVIRT_TYPES_H */
|
||||
Loading…
Reference in New Issue
Block a user