d3561b7fa0
Create a paravirt.h header for all the critical operations which need to be
replaced with hypervisor calls, and include that instead of defining native
operations, when CONFIG_PARAVIRT.
This patch does the dumbest possible replacement of paravirtualized
instructions: calls through a "paravirt_ops" structure. Currently these are
function implementations of native hardware: hypervisors will override the ops
structure with their own variants.
All the pv-ops functions are declared "fastcall" so that a specific
register-based ABI is used, to make inlining assember easier.
And:
+From: Andy Whitcroft <apw@shadowen.org>
The paravirt ops introduce a 'weak' attribute onto memory_setup().
Code ordering leads to the following warnings on x86:
arch/i386/kernel/setup.c:651: warning: weak declaration of
`memory_setup' after first use results in unspecified behavior
Move memory_setup() to avoid this.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
282 lines
8.2 KiB
C
282 lines
8.2 KiB
C
#ifndef __ASM_PARAVIRT_H
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#define __ASM_PARAVIRT_H
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/* Various instructions on x86 need to be replaced for
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* para-virtualization: those hooks are defined here. */
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#include <linux/linkage.h>
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#ifdef CONFIG_PARAVIRT
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#ifndef __ASSEMBLY__
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struct thread_struct;
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struct Xgt_desc_struct;
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struct tss_struct;
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struct paravirt_ops
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{
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unsigned int kernel_rpl;
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int paravirt_enabled;
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const char *name;
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void (*arch_setup)(void);
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char *(*memory_setup)(void);
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void (*init_IRQ)(void);
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void (*banner)(void);
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unsigned long (*get_wallclock)(void);
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int (*set_wallclock)(unsigned long);
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void (*time_init)(void);
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/* All the function pointers here are declared as "fastcall"
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so that we get a specific register-based calling
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convention. This makes it easier to implement inline
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assembler replacements. */
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void (fastcall *cpuid)(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx);
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unsigned long (fastcall *get_debugreg)(int regno);
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void (fastcall *set_debugreg)(int regno, unsigned long value);
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void (fastcall *clts)(void);
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unsigned long (fastcall *read_cr0)(void);
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void (fastcall *write_cr0)(unsigned long);
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unsigned long (fastcall *read_cr2)(void);
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void (fastcall *write_cr2)(unsigned long);
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unsigned long (fastcall *read_cr3)(void);
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void (fastcall *write_cr3)(unsigned long);
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unsigned long (fastcall *read_cr4_safe)(void);
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unsigned long (fastcall *read_cr4)(void);
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void (fastcall *write_cr4)(unsigned long);
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unsigned long (fastcall *save_fl)(void);
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void (fastcall *restore_fl)(unsigned long);
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void (fastcall *irq_disable)(void);
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void (fastcall *irq_enable)(void);
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void (fastcall *safe_halt)(void);
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void (fastcall *halt)(void);
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void (fastcall *wbinvd)(void);
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/* err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
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u64 (fastcall *read_msr)(unsigned int msr, int *err);
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int (fastcall *write_msr)(unsigned int msr, u64 val);
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u64 (fastcall *read_tsc)(void);
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u64 (fastcall *read_pmc)(void);
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void (fastcall *load_tr_desc)(void);
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void (fastcall *load_gdt)(const struct Xgt_desc_struct *);
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void (fastcall *load_idt)(const struct Xgt_desc_struct *);
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void (fastcall *store_gdt)(struct Xgt_desc_struct *);
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void (fastcall *store_idt)(struct Xgt_desc_struct *);
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void (fastcall *set_ldt)(const void *desc, unsigned entries);
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unsigned long (fastcall *store_tr)(void);
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void (fastcall *load_tls)(struct thread_struct *t, unsigned int cpu);
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void (fastcall *write_ldt_entry)(void *dt, int entrynum,
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u32 low, u32 high);
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void (fastcall *write_gdt_entry)(void *dt, int entrynum,
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u32 low, u32 high);
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void (fastcall *write_idt_entry)(void *dt, int entrynum,
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u32 low, u32 high);
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void (fastcall *load_esp0)(struct tss_struct *tss,
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struct thread_struct *thread);
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void (fastcall *set_iopl_mask)(unsigned mask);
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void (fastcall *io_delay)(void);
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void (*const_udelay)(unsigned long loops);
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/* These two are jmp to, not actually called. */
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void (fastcall *irq_enable_sysexit)(void);
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void (fastcall *iret)(void);
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};
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extern struct paravirt_ops paravirt_ops;
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#define paravirt_enabled() (paravirt_ops.paravirt_enabled)
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static inline void load_esp0(struct tss_struct *tss,
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struct thread_struct *thread)
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{
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paravirt_ops.load_esp0(tss, thread);
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}
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#define ARCH_SETUP paravirt_ops.arch_setup();
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static inline unsigned long get_wallclock(void)
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{
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return paravirt_ops.get_wallclock();
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}
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static inline int set_wallclock(unsigned long nowtime)
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{
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return paravirt_ops.set_wallclock(nowtime);
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}
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static inline void do_time_init(void)
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{
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return paravirt_ops.time_init();
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}
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/* The paravirtualized CPUID instruction. */
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static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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paravirt_ops.cpuid(eax, ebx, ecx, edx);
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}
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/*
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* These special macros can be used to get or set a debugging register
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*/
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#define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg)
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#define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val)
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#define clts() paravirt_ops.clts()
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#define read_cr0() paravirt_ops.read_cr0()
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#define write_cr0(x) paravirt_ops.write_cr0(x)
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#define read_cr2() paravirt_ops.read_cr2()
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#define write_cr2(x) paravirt_ops.write_cr2(x)
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#define read_cr3() paravirt_ops.read_cr3()
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#define write_cr3(x) paravirt_ops.write_cr3(x)
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#define read_cr4() paravirt_ops.read_cr4()
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#define read_cr4_safe(x) paravirt_ops.read_cr4_safe()
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#define write_cr4(x) paravirt_ops.write_cr4(x)
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static inline unsigned long __raw_local_save_flags(void)
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{
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return paravirt_ops.save_fl();
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}
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static inline void raw_local_irq_restore(unsigned long flags)
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{
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return paravirt_ops.restore_fl(flags);
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}
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static inline void raw_local_irq_disable(void)
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{
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paravirt_ops.irq_disable();
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}
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static inline void raw_local_irq_enable(void)
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{
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paravirt_ops.irq_enable();
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}
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static inline unsigned long __raw_local_irq_save(void)
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{
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unsigned long flags = paravirt_ops.save_fl();
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paravirt_ops.irq_disable();
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return flags;
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}
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static inline void raw_safe_halt(void)
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{
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paravirt_ops.safe_halt();
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}
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static inline void halt(void)
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{
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paravirt_ops.safe_halt();
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}
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#define wbinvd() paravirt_ops.wbinvd()
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#define get_kernel_rpl() (paravirt_ops.kernel_rpl)
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#define rdmsr(msr,val1,val2) do { \
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int _err; \
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u64 _l = paravirt_ops.read_msr(msr,&_err); \
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val1 = (u32)_l; \
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val2 = _l >> 32; \
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} while(0)
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#define wrmsr(msr,val1,val2) do { \
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u64 _l = ((u64)(val2) << 32) | (val1); \
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paravirt_ops.write_msr((msr), _l); \
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} while(0)
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#define rdmsrl(msr,val) do { \
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int _err; \
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val = paravirt_ops.read_msr((msr),&_err); \
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} while(0)
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#define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val)))
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#define wrmsr_safe(msr,a,b) ({ \
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u64 _l = ((u64)(b) << 32) | (a); \
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paravirt_ops.write_msr((msr),_l); \
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})
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/* rdmsr with exception handling */
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#define rdmsr_safe(msr,a,b) ({ \
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int _err; \
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u64 _l = paravirt_ops.read_msr(msr,&_err); \
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(*a) = (u32)_l; \
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(*b) = _l >> 32; \
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_err; })
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#define rdtsc(low,high) do { \
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u64 _l = paravirt_ops.read_tsc(); \
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low = (u32)_l; \
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high = _l >> 32; \
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} while(0)
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#define rdtscl(low) do { \
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u64 _l = paravirt_ops.read_tsc(); \
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low = (int)_l; \
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} while(0)
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#define rdtscll(val) (val = paravirt_ops.read_tsc())
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#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
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#define rdpmc(counter,low,high) do { \
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u64 _l = paravirt_ops.read_pmc(); \
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low = (u32)_l; \
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high = _l >> 32; \
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} while(0)
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#define load_TR_desc() (paravirt_ops.load_tr_desc())
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#define load_gdt(dtr) (paravirt_ops.load_gdt(dtr))
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#define load_idt(dtr) (paravirt_ops.load_idt(dtr))
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#define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries)))
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#define store_gdt(dtr) (paravirt_ops.store_gdt(dtr))
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#define store_idt(dtr) (paravirt_ops.store_idt(dtr))
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#define store_tr(tr) ((tr) = paravirt_ops.store_tr())
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#define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu)))
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#define write_ldt_entry(dt, entry, low, high) \
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(paravirt_ops.write_ldt_entry((dt), (entry), (low), (high)))
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#define write_gdt_entry(dt, entry, low, high) \
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(paravirt_ops.write_gdt_entry((dt), (entry), (low), (high)))
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#define write_idt_entry(dt, entry, low, high) \
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(paravirt_ops.write_idt_entry((dt), (entry), (low), (high)))
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#define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask))
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/* The paravirtualized I/O functions */
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static inline void slow_down_io(void) {
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paravirt_ops.io_delay();
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#ifdef REALLY_SLOW_IO
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paravirt_ops.io_delay();
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paravirt_ops.io_delay();
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paravirt_ops.io_delay();
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#endif
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}
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#define CLI_STRING "pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax"
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#define STI_STRING "pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax"
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#else /* __ASSEMBLY__ */
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#define INTERRUPT_RETURN jmp *%cs:paravirt_ops+PARAVIRT_iret
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#define DISABLE_INTERRUPTS pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax
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#define ENABLE_INTERRUPTS pushl %eax; pushl %ecx; pushl %edx; call *%cs:paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax
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#define ENABLE_INTERRUPTS_SYSEXIT jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit
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#define GET_CR0_INTO_EAX call *paravirt_ops+PARAVIRT_read_cr0
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_PARAVIRT */
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#endif /* __ASM_PARAVIRT_H */
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