Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946630AbWKAK1R (ORCPT ); Wed, 1 Nov 2006 05:27:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946597AbWKAK1R (ORCPT ); Wed, 1 Nov 2006 05:27:17 -0500 Received: from ozlabs.org ([203.10.76.45]:44738 "EHLO ozlabs.org") by vger.kernel.org with ESMTP id S1946630AbWKAK1P (ORCPT ); Wed, 1 Nov 2006 05:27:15 -0500 Subject: [PATCH 1/7] paravirtualization: header and stubs for paravirtualizing critical operations From: Rusty Russell To: Andi Kleen Cc: Andi Kleen , virtualization@lists.osdl.org, Chris Wright , akpm@osdl.org, linux-kernel@vger.kernel.org In-Reply-To: <20061030231132.GA98768@muc.de> References: <20061029024504.760769000@sous-sol.org> <20061029024607.401333000@sous-sol.org> <200610290831.21062.ak@suse.de> <1162178936.9802.34.camel@localhost.localdomain> <20061030231132.GA98768@muc.de> Content-Type: text/plain Date: Wed, 01 Nov 2006 21:27:07 +1100 Message-Id: <1162376827.23462.5.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.8.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 36393 Lines: 1309 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. Signed-off-by: Rusty Russell Signed-off-by: Chris Wright Cc: Jeremy Fitzhardinge Cc: Zachary Amsden =================================================================== --- a/arch/i386/Kconfig +++ b/arch/i386/Kconfig @@ -196,6 +196,17 @@ config X86_ES7000 should say N here. endchoice + +config PARAVIRT + bool "Paravirtualization support (EXPERIMENTAL)" + depends on EXPERIMENTAL + help + Paravirtualization is a way of running multiple instances of + Linux on the same machine, under a hypervisor. This option + changes the kernel so it can modify itself when it is run + under a hypervisor, improving performance significantly. + However, when run without a hypervisor the kernel is + theoretically slower. If in doubt, say N. config ACPI_SRAT bool =================================================================== --- a/arch/i386/boot/compressed/misc.c +++ b/arch/i386/boot/compressed/misc.c @@ -9,6 +9,7 @@ * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 */ +#undef CONFIG_PARAVIRT #include #include #include =================================================================== --- a/arch/i386/kernel/Makefile +++ b/arch/i386/kernel/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_EARLY_PRINTK) += early_prin obj-$(CONFIG_EARLY_PRINTK) += early_printk.o obj-$(CONFIG_HPET_TIMER) += hpet.o obj-$(CONFIG_K8_NB) += k8.o +obj-$(CONFIG_PARAVIRT) += paravirt.o EXTRA_AFLAGS := -traditional =================================================================== --- a/arch/i386/kernel/asm-offsets.c +++ b/arch/i386/kernel/asm-offsets.c @@ -101,4 +101,14 @@ void foo(void) BLANK(); OFFSET(PDA_cpu, i386_pda, cpu_number); OFFSET(PDA_pcurrent, i386_pda, pcurrent); + +#ifdef CONFIG_PARAVIRT + BLANK(); + OFFSET(PARAVIRT_enabled, paravirt_ops, paravirt_enabled); + OFFSET(PARAVIRT_irq_disable, paravirt_ops, irq_disable); + OFFSET(PARAVIRT_irq_enable, paravirt_ops, irq_enable); + OFFSET(PARAVIRT_irq_enable_sysexit, paravirt_ops, irq_enable_sysexit); + OFFSET(PARAVIRT_iret, paravirt_ops, iret); + OFFSET(PARAVIRT_read_cr0, paravirt_ops, read_cr0); +#endif } =================================================================== --- a/arch/i386/kernel/entry.S +++ b/arch/i386/kernel/entry.S @@ -61,13 +61,6 @@ DF_MASK = 0x00000400 DF_MASK = 0x00000400 NT_MASK = 0x00004000 VM_MASK = 0x00020000 - -/* These are replaces for paravirtualization */ -#define DISABLE_INTERRUPTS cli -#define ENABLE_INTERRUPTS sti -#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit -#define INTERRUPT_RETURN iret -#define GET_CR0_INTO_EAX movl %cr0, %eax #ifdef CONFIG_PREEMPT #define preempt_stop DISABLE_INTERRUPTS; TRACE_IRQS_OFF @@ -416,6 +409,20 @@ ldt_ss: jnz restore_nocheck testl $0x00400000, %eax # returning to 32bit stack? jnz restore_nocheck # allright, normal return + +#ifdef CONFIG_PARAVIRT + /* + * The kernel can't run on a non-flat stack if paravirt mode + * is active. Rather than try to fixup the high bits of + * ESP, bypass this code entirely. This may break DOSemu + * and/or Wine support in a paravirt VM, although the option + * is still available to implement the setting of the high + * 16-bits in the INTERRUPT_RETURN paravirt-op. + */ + cmpl $0, paravirt_ops+PARAVIRT_enabled + jne restore_nocheck +#endif + /* If returning to userspace with 16bit stack, * try to fix the higher word of ESP, as the CPU * won't restore it. @@ -830,6 +837,19 @@ 1: INTERRUPT_RETURN .long 1b,iret_exc .previous KPROBE_END(nmi) + +#ifdef CONFIG_PARAVIRT +ENTRY(native_iret) +1: iret +.section __ex_table,"a" + .align 4 + .long 1b,iret_exc +.previous + +ENTRY(native_irq_enable_sysexit) + sti + sysexit +#endif KPROBE_ENTRY(int3) RING0_INT_FRAME =================================================================== --- a/arch/i386/kernel/i8259.c +++ b/arch/i386/kernel/i8259.c @@ -392,7 +392,10 @@ void __init init_ISA_irqs (void) } } -void __init init_IRQ(void) +/* Overridden in paravirt.c */ +void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ"))); + +void __init native_init_IRQ(void) { int i; =================================================================== --- a/arch/i386/kernel/setup.c +++ b/arch/i386/kernel/setup.c @@ -1405,7 +1405,7 @@ void __init setup_arch(char **cmdline_p) efi_init(); else { printk(KERN_INFO "BIOS-provided physical RAM map:\n"); - print_memory_map(machine_specific_memory_setup()); + print_memory_map(memory_setup()); } copy_edd(); =================================================================== --- a/arch/i386/kernel/smpboot.c +++ b/arch/i386/kernel/smpboot.c @@ -33,6 +33,11 @@ * Dave Jones : Report invalid combinations of Athlon CPUs. * Rusty Russell : Hacked into shape for new "hotplug" boot process. */ + +/* SMP boot always wants to use real time delay to allow sufficient time for + * the APs to come online */ +#define USE_REAL_TIME_DELAY + #include #include #include =================================================================== --- a/arch/i386/kernel/time.c +++ b/arch/i386/kernel/time.c @@ -56,6 +56,7 @@ #include #include #include +#include #include "mach_time.h" @@ -116,10 +117,7 @@ static int set_rtc_mmss(unsigned long no /* gets recalled with irq locally disabled */ /* XXX - does irqsave resolve this? -johnstul */ spin_lock_irqsave(&rtc_lock, flags); - if (efi_enabled) - retval = efi_set_rtc_mmss(nowtime); - else - retval = mach_set_rtc_mmss(nowtime); + retval = set_wallclock(nowtime); spin_unlock_irqrestore(&rtc_lock, flags); return retval; @@ -211,10 +209,7 @@ unsigned long read_persistent_clock(void spin_lock_irqsave(&rtc_lock, flags); - if (efi_enabled) - retval = efi_get_time(); - else - retval = mach_get_cmos_time(); + retval = get_wallclock(); spin_unlock_irqrestore(&rtc_lock, flags); @@ -280,7 +275,7 @@ static void __init hpet_time_init(void) printk("Using HPET for base-timer\n"); } - time_init_hook(); + do_time_init(); } #endif @@ -296,5 +291,5 @@ void __init time_init(void) return; } #endif - time_init_hook(); -} + do_time_init(); +} =================================================================== --- a/drivers/net/de600.c +++ b/drivers/net/de600.c @@ -43,7 +43,6 @@ static const char version[] = "de600.c: * modify the following "#define": (see for more info) #define REALLY_SLOW_IO */ -#define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */ /* use 0 for production, 1 for verification, >2 for debug */ #ifdef DE600_DEBUG =================================================================== --- a/include/asm-i386/delay.h +++ b/include/asm-i386/delay.h @@ -15,6 +15,13 @@ extern void __const_udelay(unsigned long extern void __const_udelay(unsigned long usecs); extern void __delay(unsigned long loops); +#if defined(CONFIG_PARAVIRT) && !defined(USE_REAL_TIME_DELAY) +#define udelay(n) paravirt_ops.const_udelay((n) * 0x10c7ul) + +#define ndelay(n) paravirt_ops.const_udelay((n) * 5ul) + +#else /* !PARAVIRT || USE_REAL_TIME_DELAY */ + #define udelay(n) (__builtin_constant_p(n) ? \ ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \ __udelay(n)) @@ -22,6 +29,7 @@ extern void __delay(unsigned long loops) #define ndelay(n) (__builtin_constant_p(n) ? \ ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \ __ndelay(n)) +#endif void use_tsc_delay(void); =================================================================== --- a/include/asm-i386/desc.h +++ b/include/asm-i386/desc.h @@ -55,6 +55,9 @@ static inline void pack_gate(u32 *low, u #define DESCTYPE_DPL3 0x60 /* DPL-3 */ #define DESCTYPE_S 0x10 /* !system */ +#ifdef CONFIG_PARAVIRT +#include +#else #define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8)) #define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr)) @@ -89,7 +92,11 @@ static inline void write_dt_entry(void * lp[1] = entry_high; } -static inline void set_ldt(void *addr, unsigned int entries) +#define set_ldt native_set_ldt +#endif /* CONFIG_PARAVIRT */ + +static inline fastcall void native_set_ldt(const void *addr, + unsigned int entries) { if (likely(entries == 0)) __asm__ __volatile__("lldt %w0"::"q" (0)); =================================================================== --- a/include/asm-i386/io.h +++ b/include/asm-i386/io.h @@ -256,11 +256,11 @@ static inline void flush_write_buffers(v #endif /* __KERNEL__ */ -#ifdef SLOW_IO_BY_JUMPING -#define __SLOW_DOWN_IO "jmp 1f; 1: jmp 1f; 1:" -#else +#if defined(CONFIG_PARAVIRT) +#include +#else + #define __SLOW_DOWN_IO "outb %%al,$0x80;" -#endif static inline void slow_down_io(void) { __asm__ __volatile__( @@ -270,6 +270,8 @@ static inline void slow_down_io(void) { #endif : : ); } + +#endif #ifdef CONFIG_X86_NUMAQ extern void *xquad_portio; /* Where the IO area was mapped */ =================================================================== --- a/include/asm-i386/irq.h +++ b/include/asm-i386/irq.h @@ -41,4 +41,7 @@ extern void fixup_irqs(cpumask_t map); extern void fixup_irqs(cpumask_t map); #endif +void init_IRQ(void); +void __init native_init_IRQ(void); + #endif /* _ASM_IRQ_H */ =================================================================== --- a/include/asm-i386/irqflags.h +++ b/include/asm-i386/irqflags.h @@ -10,6 +10,9 @@ #ifndef _ASM_IRQFLAGS_H #define _ASM_IRQFLAGS_H +#ifdef CONFIG_PARAVIRT +#include +#else #ifndef __ASSEMBLY__ static inline unsigned long __raw_local_save_flags(void) @@ -24,9 +27,6 @@ static inline unsigned long __raw_local_ return flags; } - -#define raw_local_save_flags(flags) \ - do { (flags) = __raw_local_save_flags(); } while (0) static inline void raw_local_irq_restore(unsigned long flags) { @@ -66,18 +66,6 @@ static inline void halt(void) __asm__ __volatile__("hlt": : :"memory"); } -static inline int raw_irqs_disabled_flags(unsigned long flags) -{ - return !(flags & (1 << 9)); -} - -static inline int raw_irqs_disabled(void) -{ - unsigned long flags = __raw_local_save_flags(); - - return raw_irqs_disabled_flags(flags); -} - /* * For spinlocks, etc: */ @@ -90,9 +78,33 @@ static inline unsigned long __raw_local_ return flags; } +#else +#define DISABLE_INTERRUPTS cli +#define ENABLE_INTERRUPTS sti +#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit +#define INTERRUPT_RETURN iret +#define GET_CR0_INTO_EAX movl %cr0, %eax +#endif /* __ASSEMBLY__ */ +#endif /* CONFIG_PARAVIRT */ + +#ifndef __ASSEMBLY__ +#define raw_local_save_flags(flags) \ + do { (flags) = __raw_local_save_flags(); } while (0) + #define raw_local_irq_save(flags) \ do { (flags) = __raw_local_irq_save(); } while (0) +static inline int raw_irqs_disabled_flags(unsigned long flags) +{ + return !(flags & (1 << 9)); +} + +static inline int raw_irqs_disabled(void) +{ + unsigned long flags = __raw_local_save_flags(); + + return raw_irqs_disabled_flags(flags); +} #endif /* __ASSEMBLY__ */ /* =================================================================== --- a/include/asm-i386/mach-default/setup_arch.h +++ b/include/asm-i386/mach-default/setup_arch.h @@ -2,4 +2,6 @@ /* no action for generic */ +#ifndef ARCH_SETUP #define ARCH_SETUP +#endif =================================================================== --- a/include/asm-i386/msr.h +++ b/include/asm-i386/msr.h @@ -1,5 +1,9 @@ #ifndef __ASM_MSR_H #define __ASM_MSR_H + +#ifdef CONFIG_PARAVIRT +#include +#else /* * Access to machine-specific registers (available on 586 and better only) @@ -77,6 +81,7 @@ static inline void wrmsrl (unsigned long __asm__ __volatile__("rdpmc" \ : "=a" (low), "=d" (high) \ : "c" (counter)) +#endif /* !CONFIG_PARAVIRT */ /* symbolic names for some interesting MSRs */ /* Intel defined MSRs. */ =================================================================== --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -146,8 +146,8 @@ static inline void detect_ht(struct cpui #define X86_EFLAGS_VIP 0x00100000 /* Virtual Interrupt Pending */ #define X86_EFLAGS_ID 0x00200000 /* CPUID detection flag */ -static inline void __cpuid(unsigned int *eax, unsigned int *ebx, - unsigned int *ecx, unsigned int *edx) +static inline fastcall void native_cpuid(unsigned int *eax, unsigned int *ebx, + unsigned int *ecx, unsigned int *edx) { /* ecx is often an input as well as an output. */ __asm__("cpuid" @@ -548,6 +548,12 @@ static inline void rep_nop(void) #define cpu_relax() rep_nop() +#ifdef CONFIG_PARAVIRT +#include +#else +#define paravirt_enabled() 0 +#define __cpuid native_cpuid + static inline void load_esp0(struct tss_struct *tss, struct thread_struct *thread) { tss->esp0 = thread->esp0; @@ -570,10 +576,13 @@ static inline void load_esp0(struct tss_ : /* no output */ \ :"r" (value)) +#define set_iopl_mask native_set_iopl_mask +#endif /* CONFIG_PARAVIRT */ + /* * Set IOPL bits in EFLAGS from given mask */ -static inline void set_iopl_mask(unsigned mask) +static fastcall inline void native_set_iopl_mask(unsigned mask) { unsigned int reg; __asm__ __volatile__ ("pushfl;" =================================================================== --- a/include/asm-i386/segment.h +++ b/include/asm-i386/segment.h @@ -131,5 +131,7 @@ #define SEGMENT_LDT 0x4 #define SEGMENT_GDT 0x0 +#ifndef CONFIG_PARAVIRT #define get_kernel_rpl() 0 #endif +#endif =================================================================== --- a/include/asm-i386/setup.h +++ b/include/asm-i386/setup.h @@ -70,6 +70,14 @@ struct e820entry; struct e820entry; char * __init machine_specific_memory_setup(void); +#ifndef CONFIG_PARAVIRT +static inline char *memory_setup(void) +{ + return machine_specific_memory_setup(); +} +#else +#include +#endif int __init copy_e820_map(struct e820entry * biosmap, int nr_map); int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map); =================================================================== --- a/include/asm-i386/spinlock.h +++ b/include/asm-i386/spinlock.h @@ -7,8 +7,12 @@ #include #include +#ifdef CONFIG_PARAVIRT +#include +#else #define CLI_STRING "cli" #define STI_STRING "sti" +#endif /* CONFIG_PARAVIRT */ /* * Your basic SMP spinlocks, allowing only a single CPU anywhere =================================================================== --- a/include/asm-i386/system.h +++ b/include/asm-i386/system.h @@ -88,6 +88,9 @@ __asm__ __volatile__ ("movw %%dx,%1\n\t" #define savesegment(seg, value) \ asm volatile("mov %%" #seg ",%0":"=rm" (value)) +#ifdef CONFIG_PARAVIRT +#include +#else #define read_cr0() ({ \ unsigned int __dummy; \ __asm__ __volatile__( \ @@ -139,16 +142,17 @@ __asm__ __volatile__ ("movw %%dx,%1\n\t" #define write_cr4(x) \ __asm__ __volatile__("movl %0,%%cr4": :"r" (x)) -/* - * Clear and set 'TS' bit respectively - */ -#define clts() __asm__ __volatile__ ("clts") -#define stts() write_cr0(8 | read_cr0()) - -#endif /* __KERNEL__ */ - #define wbinvd() \ __asm__ __volatile__ ("wbinvd": : :"memory") + +/* Clear the 'TS' bit */ +#define clts() __asm__ __volatile__ ("clts") +#endif/* CONFIG_PARAVIRT */ + +/* Set the 'TS' bit */ +#define stts() write_cr0(8 | read_cr0()) + +#endif /* __KERNEL__ */ static inline unsigned long get_limit(unsigned long segment) { =================================================================== --- /dev/null +++ b/arch/i386/kernel/paravirt.c @@ -0,0 +1,399 @@ +/* Paravirtualization interfaces + Copyright (C) 2006 Rusty Russell IBM Corporation + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +*/ +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +/* nop stub */ +static void native_nop(void) +{ +} + +static void __init default_banner(void) +{ + printk(KERN_INFO "Booting paravirtualized kernel on %s\n", + paravirt_ops.name); +} + +static fastcall unsigned long native_get_debugreg(int regno) +{ + unsigned long val = 0; /* Damn you, gcc! */ + + switch (regno) { + case 0: + asm("movl %%db0, %0" :"=r" (val)); break; + case 1: + asm("movl %%db1, %0" :"=r" (val)); break; + case 2: + asm("movl %%db2, %0" :"=r" (val)); break; + case 3: + asm("movl %%db3, %0" :"=r" (val)); break; + case 6: + asm("movl %%db6, %0" :"=r" (val)); break; + case 7: + asm("movl %%db7, %0" :"=r" (val)); break; + default: + BUG(); + } + return val; +} + +static fastcall void native_set_debugreg(int regno, unsigned long value) +{ + switch (regno) { + case 0: + asm("movl %0,%%db0" : /* no output */ :"r" (value)); + break; + case 1: + asm("movl %0,%%db1" : /* no output */ :"r" (value)); + break; + case 2: + asm("movl %0,%%db2" : /* no output */ :"r" (value)); + break; + case 3: + asm("movl %0,%%db3" : /* no output */ :"r" (value)); + break; + case 6: + asm("movl %0,%%db6" : /* no output */ :"r" (value)); + break; + case 7: + asm("movl %0,%%db7" : /* no output */ :"r" (value)); + break; + default: + BUG(); + } +} + +void init_IRQ(void) +{ + paravirt_ops.init_IRQ(); +} + +static fastcall void native_clts(void) +{ + asm volatile ("clts"); +} + +static fastcall unsigned long native_read_cr0(void) +{ + unsigned long val; + asm volatile("movl %%cr0,%0\n\t" :"=r" (val)); + return val; +} + +static fastcall void native_write_cr0(unsigned long val) +{ + asm volatile("movl %0,%%cr0": :"r" (val)); +} + +static fastcall unsigned long native_read_cr2(void) +{ + unsigned long val; + asm volatile("movl %%cr2,%0\n\t" :"=r" (val)); + return val; +} + +static fastcall void native_write_cr2(unsigned long val) +{ + asm volatile("movl %0,%%cr2": :"r" (val)); +} + +static fastcall unsigned long native_read_cr3(void) +{ + unsigned long val; + asm volatile("movl %%cr3,%0\n\t" :"=r" (val)); + return val; +} + +static fastcall void native_write_cr3(unsigned long val) +{ + asm volatile("movl %0,%%cr3": :"r" (val)); +} + +static fastcall unsigned long native_read_cr4(void) +{ + unsigned long val; + asm volatile("movl %%cr4,%0\n\t" :"=r" (val)); + return val; +} + +static fastcall unsigned long native_read_cr4_safe(void) +{ + unsigned long val; + /* This could fault if %cr4 does not exist */ + asm("1: movl %%cr4, %0 \n" + "2: \n" + ".section __ex_table,\"a\" \n" + ".long 1b,2b \n" + ".previous \n" + : "=r" (val): "0" (0)); + return val; +} + +static fastcall void native_write_cr4(unsigned long val) +{ + asm volatile("movl %0,%%cr4": :"r" (val)); +} + +static fastcall unsigned long native_save_fl(void) +{ + unsigned long f; + asm volatile("pushfl ; popl %0":"=g" (f): /* no input */); + return f; +} + +static fastcall void native_restore_fl(unsigned long f) +{ + asm volatile("pushl %0 ; popfl": /* no output */ + :"g" (f) + :"memory", "cc"); +} + +static fastcall void native_irq_disable(void) +{ + asm volatile("cli": : :"memory"); +} + +static fastcall void native_irq_enable(void) +{ + asm volatile("sti": : :"memory"); +} + +static fastcall void native_safe_halt(void) +{ + asm volatile("sti; hlt": : :"memory"); +} + +static fastcall void native_halt(void) +{ + asm volatile("hlt": : :"memory"); +} + +static fastcall void native_wbinvd(void) +{ + asm volatile("wbinvd": : :"memory"); +} + +static fastcall unsigned long long native_read_msr(unsigned int msr, int *err) +{ + unsigned long long val; + + asm volatile("2: rdmsr ; xorl %0,%0\n" + "1:\n\t" + ".section .fixup,\"ax\"\n\t" + "3: movl %3,%0 ; jmp 1b\n\t" + ".previous\n\t" + ".section __ex_table,\"a\"\n" + " .align 4\n\t" + " .long 2b,3b\n\t" + ".previous" + : "=r" (*err), "=A" (val) + : "c" (msr), "i" (-EFAULT)); + + return val; +} + +static fastcall int native_write_msr(unsigned int msr, unsigned long long val) +{ + int err; + asm volatile("2: wrmsr ; xorl %0,%0\n" + "1:\n\t" + ".section .fixup,\"ax\"\n\t" + "3: movl %4,%0 ; jmp 1b\n\t" + ".previous\n\t" + ".section __ex_table,\"a\"\n" + " .align 4\n\t" + " .long 2b,3b\n\t" + ".previous" + : "=a" (err) + : "c" (msr), "0" ((u32)val), "d" ((u32)(val>>32)), + "i" (-EFAULT)); + return err; +} + +static fastcall unsigned long long native_read_tsc(void) +{ + unsigned long long val; + asm volatile("rdtsc" : "=A" (val)); + return val; +} + +static fastcall unsigned long long native_read_pmc(void) +{ + unsigned long long val; + asm volatile("rdpmc" : "=A" (val)); + return val; +} + +static fastcall void native_load_tr_desc(void) +{ + asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8)); +} + +static fastcall void native_load_gdt(const struct Xgt_desc_struct *dtr) +{ + asm volatile("lgdt %0"::"m" (*dtr)); +} + +static fastcall void native_load_idt(const struct Xgt_desc_struct *dtr) +{ + asm volatile("lidt %0"::"m" (*dtr)); +} + +static fastcall void native_store_gdt(struct Xgt_desc_struct *dtr) +{ + asm ("sgdt %0":"=m" (*dtr)); +} + +static fastcall void native_store_idt(struct Xgt_desc_struct *dtr) +{ + asm ("sidt %0":"=m" (*dtr)); +} + +static fastcall unsigned long native_store_tr(void) +{ + unsigned long tr; + asm ("str %0":"=r" (tr)); + return tr; +} + +static fastcall void native_load_tls(struct thread_struct *t, unsigned int cpu) +{ +#define C(i) get_cpu_gdt_table(cpu)[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i] + C(0); C(1); C(2); +#undef C +} + +static inline void native_write_dt_entry(void *dt, int entry, u32 entry_low, u32 entry_high) +{ + u32 *lp = (u32 *)((char *)dt + entry*8); + lp[0] = entry_low; + lp[1] = entry_high; +} + +static fastcall void native_write_ldt_entry(void *dt, int entrynum, u32 low, u32 high) +{ + native_write_dt_entry(dt, entrynum, low, high); +} + +static fastcall void native_write_gdt_entry(void *dt, int entrynum, u32 low, u32 high) +{ + native_write_dt_entry(dt, entrynum, low, high); +} + +static fastcall void native_write_idt_entry(void *dt, int entrynum, u32 low, u32 high) +{ + native_write_dt_entry(dt, entrynum, low, high); +} + +static fastcall void native_load_esp0(struct tss_struct *tss, + struct thread_struct *thread) +{ + tss->esp0 = thread->esp0; + + /* This can only happen when SEP is enabled, no need to test "SEP"arately */ + if (unlikely(tss->ss1 != thread->sysenter_cs)) { + tss->ss1 = thread->sysenter_cs; + wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); + } +} + +static fastcall void native_io_delay(void) +{ + asm volatile("outb %al,$0x80"); +} + +/* These are in entry.S */ +extern fastcall void native_iret(void); +extern fastcall void native_irq_enable_sysexit(void); + +static int __init print_banner(void) +{ + paravirt_ops.banner(); + return 0; +} +core_initcall(print_banner); + +struct paravirt_ops paravirt_ops = { + .name = "bare hardware", + .paravirt_enabled = 0, + .kernel_rpl = 0, + + .banner = default_banner, + .arch_setup = native_nop, + .memory_setup = machine_specific_memory_setup, + .get_wallclock = native_get_wallclock, + .set_wallclock = native_set_wallclock, + .time_init = time_init_hook, + .init_IRQ = native_init_IRQ, + + .cpuid = native_cpuid, + .get_debugreg = native_get_debugreg, + .set_debugreg = native_set_debugreg, + .clts = native_clts, + .read_cr0 = native_read_cr0, + .write_cr0 = native_write_cr0, + .read_cr2 = native_read_cr2, + .write_cr2 = native_write_cr2, + .read_cr3 = native_read_cr3, + .write_cr3 = native_write_cr3, + .read_cr4 = native_read_cr4, + .read_cr4_safe = native_read_cr4_safe, + .write_cr4 = native_write_cr4, + .save_fl = native_save_fl, + .restore_fl = native_restore_fl, + .irq_disable = native_irq_disable, + .irq_enable = native_irq_enable, + .safe_halt = native_safe_halt, + .halt = native_halt, + .wbinvd = native_wbinvd, + .read_msr = native_read_msr, + .write_msr = native_write_msr, + .read_tsc = native_read_tsc, + .read_pmc = native_read_pmc, + .load_tr_desc = native_load_tr_desc, + .set_ldt = native_set_ldt, + .load_gdt = native_load_gdt, + .load_idt = native_load_idt, + .store_gdt = native_store_gdt, + .store_idt = native_store_idt, + .store_tr = native_store_tr, + .load_tls = native_load_tls, + .write_ldt_entry = native_write_ldt_entry, + .write_gdt_entry = native_write_gdt_entry, + .write_idt_entry = native_write_idt_entry, + .load_esp0 = native_load_esp0, + + .set_iopl_mask = native_set_iopl_mask, + .io_delay = native_io_delay, + .const_udelay = __const_udelay, + + .irq_enable_sysexit = native_irq_enable_sysexit, + .iret = native_iret, +}; +EXPORT_SYMBOL(paravirt_ops); =================================================================== --- /dev/null +++ b/include/asm-i386/paravirt.h @@ -0,0 +1,286 @@ +#ifndef __ASM_PARAVIRT_H +#define __ASM_PARAVIRT_H +/* Various instructions on x86 need to be replaced for + * para-virtualization: those hooks are defined here. */ +#include + +#ifdef CONFIG_PARAVIRT +#ifndef __ASSEMBLY__ +struct thread_struct; +struct Xgt_desc_struct; +struct tss_struct; +struct paravirt_ops +{ + unsigned int kernel_rpl; + int paravirt_enabled; + const char *name; + + void (*arch_setup)(void); + char *(*memory_setup)(void); + void (*init_IRQ)(void); + + void (*banner)(void); + + unsigned long (*get_wallclock)(void); + int (*set_wallclock)(unsigned long); + void (*time_init)(void); + + /* All the function pointers here are declared as "fastcall" + so that we get a specific register-based calling + convention. This makes it easier to implement inline + assembler replacements. */ + + void (fastcall *cpuid)(unsigned int *eax, unsigned int *ebx, + unsigned int *ecx, unsigned int *edx); + + unsigned long (fastcall *get_debugreg)(int regno); + void (fastcall *set_debugreg)(int regno, unsigned long value); + + void (fastcall *clts)(void); + + unsigned long (fastcall *read_cr0)(void); + void (fastcall *write_cr0)(unsigned long); + + unsigned long (fastcall *read_cr2)(void); + void (fastcall *write_cr2)(unsigned long); + + unsigned long (fastcall *read_cr3)(void); + void (fastcall *write_cr3)(unsigned long); + + unsigned long (fastcall *read_cr4_safe)(void); + unsigned long (fastcall *read_cr4)(void); + void (fastcall *write_cr4)(unsigned long); + + unsigned long (fastcall *save_fl)(void); + void (fastcall *restore_fl)(unsigned long); + void (fastcall *irq_disable)(void); + void (fastcall *irq_enable)(void); + void (fastcall *safe_halt)(void); + void (fastcall *halt)(void); + void (fastcall *wbinvd)(void); + + /* err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */ + u64 (fastcall *read_msr)(unsigned int msr, int *err); + int (fastcall *write_msr)(unsigned int msr, u64 val); + + u64 (fastcall *read_tsc)(void); + u64 (fastcall *read_pmc)(void); + + void (fastcall *load_tr_desc)(void); + void (fastcall *load_gdt)(const struct Xgt_desc_struct *); + void (fastcall *load_idt)(const struct Xgt_desc_struct *); + void (fastcall *store_gdt)(struct Xgt_desc_struct *); + void (fastcall *store_idt)(struct Xgt_desc_struct *); + void (fastcall *set_ldt)(const void *desc, unsigned entries); + unsigned long (fastcall *store_tr)(void); + void (fastcall *load_tls)(struct thread_struct *t, unsigned int cpu); + void (fastcall *write_ldt_entry)(void *dt, int entrynum, + u32 low, u32 high); + void (fastcall *write_gdt_entry)(void *dt, int entrynum, + u32 low, u32 high); + void (fastcall *write_idt_entry)(void *dt, int entrynum, + u32 low, u32 high); + void (fastcall *load_esp0)(struct tss_struct *tss, + struct thread_struct *thread); + + void (fastcall *set_iopl_mask)(unsigned mask); + + void (fastcall *io_delay)(void); + void (*const_udelay)(unsigned long loops); + + /* These two are jmp to, not actually called. */ + void (fastcall *irq_enable_sysexit)(void); + void (fastcall *iret)(void); +}; + +extern struct paravirt_ops paravirt_ops; + +#define paravirt_enabled() (paravirt_ops.paravirt_enabled) + +static inline void load_esp0(struct tss_struct *tss, + struct thread_struct *thread) +{ + paravirt_ops.load_esp0(tss, thread); +} + +#define ARCH_SETUP paravirt_ops.arch_setup(); +static inline char *memory_setup(void) +{ + return paravirt_ops.memory_setup(); +} + +static inline unsigned long get_wallclock(void) +{ + return paravirt_ops.get_wallclock(); +} + +static inline int set_wallclock(unsigned long nowtime) +{ + return paravirt_ops.set_wallclock(nowtime); +} + +static inline void do_time_init(void) +{ + return paravirt_ops.time_init(); +} + +/* The paravirtualized CPUID instruction. */ +static inline void __cpuid(unsigned int *eax, unsigned int *ebx, + unsigned int *ecx, unsigned int *edx) +{ + paravirt_ops.cpuid(eax, ebx, ecx, edx); +} + +/* + * These special macros can be used to get or set a debugging register + */ +#define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg) +#define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val) + +#define clts() paravirt_ops.clts() + +#define read_cr0() paravirt_ops.read_cr0() +#define write_cr0(x) paravirt_ops.write_cr0(x) + +#define read_cr2() paravirt_ops.read_cr2() +#define write_cr2(x) paravirt_ops.write_cr2(x) + +#define read_cr3() paravirt_ops.read_cr3() +#define write_cr3(x) paravirt_ops.write_cr3(x) + +#define read_cr4() paravirt_ops.read_cr4() +#define read_cr4_safe(x) paravirt_ops.read_cr4_safe() +#define write_cr4(x) paravirt_ops.write_cr4(x) + +static inline unsigned long __raw_local_save_flags(void) +{ + return paravirt_ops.save_fl(); +} + +static inline void raw_local_irq_restore(unsigned long flags) +{ + return paravirt_ops.restore_fl(flags); +} + +static inline void raw_local_irq_disable(void) +{ + paravirt_ops.irq_disable(); +} + +static inline void raw_local_irq_enable(void) +{ + paravirt_ops.irq_enable(); +} + +static inline unsigned long __raw_local_irq_save(void) +{ + unsigned long flags = paravirt_ops.save_fl(); + + paravirt_ops.irq_disable(); + + return flags; +} + +static inline void raw_safe_halt(void) +{ + paravirt_ops.safe_halt(); +} + +static inline void halt(void) +{ + paravirt_ops.safe_halt(); +} +#define wbinvd() paravirt_ops.wbinvd() + +#define get_kernel_rpl() (paravirt_ops.kernel_rpl) + +#define rdmsr(msr,val1,val2) do { \ + int _err; \ + u64 _l = paravirt_ops.read_msr(msr,&_err); \ + val1 = (u32)_l; \ + val2 = _l >> 32; \ +} while(0) + +#define wrmsr(msr,val1,val2) do { \ + u64 _l = ((u64)(val2) << 32) | (val1); \ + paravirt_ops.write_msr((msr), _l); \ +} while(0) + +#define rdmsrl(msr,val) do { \ + int _err; \ + val = paravirt_ops.read_msr((msr),&_err); \ +} while(0) + +#define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val))) +#define wrmsr_safe(msr,a,b) ({ \ + u64 _l = ((u64)(b) << 32) | (a); \ + paravirt_ops.write_msr((msr),_l); \ +}) + +/* rdmsr with exception handling */ +#define rdmsr_safe(msr,a,b) ({ \ + int _err; \ + u64 _l = paravirt_ops.read_msr(msr,&_err); \ + (*a) = (u32)_l; \ + (*b) = _l >> 32; \ + _err; }) + +#define rdtsc(low,high) do { \ + u64 _l = paravirt_ops.read_tsc(); \ + low = (u32)_l; \ + high = _l >> 32; \ +} while(0) + +#define rdtscl(low) do { \ + u64 _l = paravirt_ops.read_tsc(); \ + low = (int)_l; \ +} while(0) + +#define rdtscll(val) (val = paravirt_ops.read_tsc()) + +#define write_tsc(val1,val2) wrmsr(0x10, val1, val2) + +#define rdpmc(counter,low,high) do { \ + u64 _l = paravirt_ops.read_pmc(); \ + low = (u32)_l; \ + high = _l >> 32; \ +} while(0) + +#define load_TR_desc() (paravirt_ops.load_tr_desc()) +#define load_gdt(dtr) (paravirt_ops.load_gdt(dtr)) +#define load_idt(dtr) (paravirt_ops.load_idt(dtr)) +#define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries))) +#define store_gdt(dtr) (paravirt_ops.store_gdt(dtr)) +#define store_idt(dtr) (paravirt_ops.store_idt(dtr)) +#define store_tr(tr) ((tr) = paravirt_ops.store_tr()) +#define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu))) +#define write_ldt_entry(dt, entry, low, high) \ + (paravirt_ops.write_ldt_entry((dt), (entry), (low), (high))) +#define write_gdt_entry(dt, entry, low, high) \ + (paravirt_ops.write_gdt_entry((dt), (entry), (low), (high))) +#define write_idt_entry(dt, entry, low, high) \ + (paravirt_ops.write_idt_entry((dt), (entry), (low), (high))) +#define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask)) + +/* The paravirtualized I/O functions */ +static inline void slow_down_io(void) { + paravirt_ops.io_delay(); +#ifdef REALLY_SLOW_IO + paravirt_ops.io_delay(); + paravirt_ops.io_delay(); + paravirt_ops.io_delay(); +#endif +} + +#define CLI_STRING "pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax" +#define STI_STRING "pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax" +#else /* __ASSEMBLY__ */ + +#define INTERRUPT_RETURN jmp *%cs:paravirt_ops+PARAVIRT_iret +#define DISABLE_INTERRUPTS pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax +#define ENABLE_INTERRUPTS pushl %eax; pushl %ecx; pushl %edx; call *%cs:paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax +#define ENABLE_INTERRUPTS_SYSEXIT jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit +#define GET_CR0_INTO_EAX call *paravirt_ops+PARAVIRT_read_cr0 +#endif /* __ASSEMBLY__ */ +#endif /* CONFIG_PARAVIRT */ +#endif /* __ASM_PARAVIRT_H */ =================================================================== --- /dev/null +++ b/include/asm-i386/time.h @@ -0,0 +1,41 @@ +#ifndef _ASMi386_TIME_H +#define _ASMi386_TIME_H + +#include +#include "mach_time.h" + +static inline unsigned long native_get_wallclock(void) +{ + unsigned long retval; + + if (efi_enabled) + retval = efi_get_time(); + else + retval = mach_get_cmos_time(); + + return retval; +} + +static inline int native_set_wallclock(unsigned long nowtime) +{ + int retval; + + if (efi_enabled) + retval = efi_set_rtc_mmss(nowtime); + else + retval = mach_set_rtc_mmss(nowtime); + + return retval; +} + +#ifdef CONFIG_PARAVIRT +#include +#else /* !CONFIG_PARAVIRT */ + +#define get_wallclock() native_get_wallclock() +#define set_wallclock(x) native_set_wallclock(x) +#define do_time_init() time_init_hook() + +#endif /* CONFIG_PARAVIRT */ + +#endif - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/