search for: lidt

...On Thu, Aug 27, 2020 at 11:26:57AM -0400, Arvind Sankar wrote: > On Mon, Aug 24, 2020 at 10:54:08AM +0200, Joerg Roedel wrote: > > + pushq %rsi > > + call load_stage1_idt > > + popq %rsi > > + > > Do we need the functions later in the series or could this just use lidt > directly? The function also sets up the actual IDT entries in the table before doing the lidt, so this needs to be a call to a C function. Setting up IDT entries in assembly does not result in readable code. > Is there any risk of exceptions getting triggered during the move of the > c...

Stop using extra underscores on asm and volatiles, that is just silly. Also, make lgdt/lidt/sgdt/sldt explicitly "l". Index: linux-2.6.13/include/asm-i386/desc.h =================================================================== --- linux-2.6.13.orig/include/asm-i386/desc.h 2005-08-08 17:10:49.000000000 -0700 +++ linux-2.6.13/include/asm-i386/desc.h 2005-08-08 17:15:46.00000000...

Stop using extra underscores on asm and volatiles, that is just silly. Also, make lgdt/lidt/sgdt/sldt explicitly "l". Index: linux-2.6.13/include/asm-i386/desc.h =================================================================== --- linux-2.6.13.orig/include/asm-i386/desc.h 2005-08-08 17:10:49.000000000 -0700 +++ linux-2.6.13/include/asm-i386/desc.h 2005-08-08 17:15:46.00000000...

Stop using extra underscores on asm and volatiles, that is just silly. Also, make lgdt/lidt/sgdt/sldt explicitly "l". Patch-base: 2.6.13-rc5-mm1 Patch-keys: i386 desc cleanup Signed-off-by: Zachary Amsden <zach@vmware.com> Index: linux-2.6.13/include/asm-i386/mach-default/mach_desc.h =================================================================== --- linux-2.6.13.orig...

Stop using extra underscores on asm and volatiles, that is just silly. Also, make lgdt/lidt/sgdt/sldt explicitly "l". Patch-base: 2.6.13-rc5-mm1 Patch-keys: i386 desc cleanup Signed-off-by: Zachary Amsden <zach@vmware.com> Index: linux-2.6.13/include/asm-i386/mach-default/mach_desc.h =================================================================== --- linux-2.6.13.orig...

...+ /* Don't add a printk in there. printk relies on the PDA which is not initialized yet. */ static void __init clear_bss(void) @@ -62,7 +66,7 @@ void __init x86_64_start_kernel(char * r for (i = 0; i < IDT_ENTRIES; i++) set_intr_gate(i, early_idt_handler); - asm volatile("lidt %0" :: "m" (idt_descr)); + load_idt((const struct desc_ptr *)&idt_descr); early_printk("Kernel alive\n"); @@ -70,7 +74,7 @@ void __init x86_64_start_kernel(char * r * switch to init_level4_pgt from boot_level4_pgt */ memcpy(init_level4_pgt, boot_level4_pgt...

...+ /* Don't add a printk in there. printk relies on the PDA which is not initialized yet. */ static void __init clear_bss(void) @@ -62,7 +66,7 @@ void __init x86_64_start_kernel(char * r for (i = 0; i < IDT_ENTRIES; i++) set_intr_gate(i, early_idt_handler); - asm volatile("lidt %0" :: "m" (idt_descr)); + load_idt((const struct desc_ptr *)&idt_descr); early_printk("Kernel alive\n"); @@ -70,7 +74,7 @@ void __init x86_64_start_kernel(char * r * switch to init_level4_pgt from boot_level4_pgt */ memcpy(init_level4_pgt, boot_level4_pgt...

...0x4856 (0) movl %cr0, %eax (XEN) HVM10: 0x00004859: 0x0:0x4859 (0) opc 0xC (XEN) HVM10: 0x0000485B: 0x0:0x485B (0) movl %eax, %cr0 (XEN) HVM10: 0x000048C1: 0x0:0x48C1 (0) <VM86_REAL> (XEN) HVM10: 0x00008DCE: 0x0:0x8DCE (0) lgdt 0x4810 <47, 0x4810> (XEN) HVM10: 0x00008DD3: 0x0:0x8DD3 (0) lidt 0x9FBC <2048, 0x100000> (XEN) HVM10: 0x00008DD8: 0x0:0x8DD8 (0) movl %cr0, %eax (XEN) HVM10: 0x00008DDB: 0x0:0x8DDB (0) opc 0xC (XEN) HVM10: 0x00008DDD: 0x0:0x8DDD (0) movl %eax, %cr0 (XEN) HVM10: 0x00008E89: 0x0:0x8E89 (0) <VM86_REAL> (XEN) HVM10: 0x00008DCE: 0x0:0x8DCE (0) lgdt 0x4810...

...olatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8)) -#define load_LDT_desc() __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8)) - -#define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr)) -#define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr)) -#define load_tr(tr) __asm__ __volatile("ltr %0"::"mr" (tr)) -#define load_ldt(ldt) __asm__ __volatile("lldt %0"::"mr" (ldt)) - -#define store_gdt(dtr) __asm__ ("sgdt %0":"=m" (*dtr)) -#define store_idt(dtr)...

...olatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8)) -#define load_LDT_desc() __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8)) - -#define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr)) -#define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr)) -#define load_tr(tr) __asm__ __volatile("ltr %0"::"mr" (tr)) -#define load_ldt(ldt) __asm__ __volatile("lldt %0"::"mr" (ldt)) - -#define store_gdt(dtr) __asm__ ("sgdt %0":"=m" (*dtr)) -#define store_idt(dtr)...

...72e36..7f2d5e14db73 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -220,6 +220,9 @@ SYM_CODE_START(secondary_startup_64) */ movq initial_stack(%rip), %rsp + /* Setup a TSS for early IST handlers - needs %gs to be set up */ + call early_load_tss + /* Load IDT */ lidt idt_descr(%rip) -- 2.17.1

...) +{ + asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8)); +} + +static inline void native_load_gdt(const struct desc_ptr *dtr) +{ + asm volatile("lgdt %w0"::"m" (*dtr)); +} + +static inline void native_load_idt(const struct desc_ptr *dtr) +{ + asm volatile("lidt %w0"::"m" (*dtr)); +} + +#ifdef CONFIG_PARAVIRT +#include <asm/paravirt.h> +#else +#define load_idt native_load_idt +#define load_gdt native_load_gdt +#define load_TR_desc native_load_tr_desc +#define set_ldt native_set_ldt +#define load_TLS native_load_TLS +#endif /* CONFIG_PA...

...) +{ + asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8)); +} + +static inline void native_load_gdt(const struct desc_ptr *dtr) +{ + asm volatile("lgdt %w0"::"m" (*dtr)); +} + +static inline void native_load_idt(const struct desc_ptr *dtr) +{ + asm volatile("lidt %w0"::"m" (*dtr)); +} + +#ifdef CONFIG_PARAVIRT +#include <asm/paravirt.h> +#else +#define load_idt native_load_idt +#define load_gdt native_load_gdt +#define load_TR_desc native_load_tr_desc +#define set_ldt native_set_ldt +#define load_TLS native_load_TLS +#endif /* CONFIG_PA...

...(u32)(address >> 32); > + > + memcpy(&boot_idt[vector], &entry, sizeof(entry)); > +} > + > +/* Have this here so we don't need to include <asm/desc.h> */ > +static void load_boot_idt(const struct desc_ptr *dtr) > +{ > + asm volatile("lidt %0"::"m" (*dtr)); > +} > + > +/* Setup IDT before kernel jumping to .Lrelocated */ > +void load_stage1_idt(void) > +{ > + boot_idt_desc.address = (unsigned long)boot_idt; > + > + load_boot_idt(&boot_idt_desc); > +} > + > +/* Setup IDT...

...s latest cr4 setting */ + mov REF(mmu_cr4_features), GREG(ax) + mov GREG(ax), %cr4 + + mov REF(saved_cr3), GREG(ax) + mov GREG(ax), %cr3 + + mov REF(saved_cr0), GREG(ax) + mov GREG(ax), %cr0 + + lgdt REF(saved_gdt) + lidt REF(saved_idt) + lldt REF(saved_ldt) + + mov REF(saved_ss), %ss + LOAD_GREG(sp) + +#if defined(__x86_64__) + + mov REF(saved_cr8), %rax + mov %rax, %cr8 + + pushq SAVED_GREG(flags) + popfq + + /* Idle vcpu doesn''t...

...>> 16) & 0xffff); + entry.offset_high = (u32)(address >> 32); + + memcpy(&boot_idt[vector], &entry, sizeof(entry)); +} + +/* Have this here so we don't need to include <asm/desc.h> */ +static void load_boot_idt(const struct desc_ptr *dtr) +{ + asm volatile("lidt %0"::"m" (*dtr)); +} + +/* Setup IDT before kernel jumping to .Lrelocated */ +void load_stage1_idt(void) +{ + boot_idt_desc.address = (unsigned long)boot_idt; + + load_boot_idt(&boot_idt_desc); +} + +/* Setup IDT after kernel jumping to .Lrelocated */ +void load_stage2_idt(void...

...>> 16) & 0xffff); + entry.offset_high = (u32)(address >> 32); + + memcpy(&boot_idt[vector], &entry, sizeof(entry)); +} + +/* Have this here so we don't need to include <asm/desc.h> */ +static void load_boot_idt(const struct desc_ptr *dtr) +{ + asm volatile("lidt %0"::"m" (*dtr)); +} + +/* Setup IDT before kernel jumping to .Lrelocated */ +void load_stage1_idt(void) +{ + boot_idt_desc.address = (unsigned long)boot_idt; + + load_boot_idt(&boot_idt_desc); +} + +/* Setup IDT after kernel jumping to .Lrelocated */ +void load_stage2_idt(void...

...e_gdt: .word 0 .long 0 @@ -184,7 +197,11 @@ ENTRY(wakeup_end) .org 0x1000 wakeup_pmode_return: +#ifndef __XEN__ movw $__KERNEL_DS, %ax +#else + movw $__HYPERVISOR_DS, %ax +#endif movw %ax, %ss movw %ax, %ds movw %ax, %es @@ -196,7 +213,11 @@ wakeup_pmode_return: lgdt saved_gdt lidt saved_idt lldt saved_ldt +#ifndef __XEN__ ljmp $(__KERNEL_CS),$1f +#else + ljmp $(__HYPERVISOR_CS),$1f +#endif 1: movl %cr3, %eax movl %eax, %cr3 diff -r 13e258a58044 xen/arch/x86/x86_32/mm.c --- a/xen/arch/x86/x86_32/mm.c Wed Feb 14 11:13:40 2007 +0800 +++ b/xen/arch/x86/x86_32/mm.c We...

(Andrew, please sit these in the -mm tree for cooking) Create a paravirt.h header for (almost) all the critical operations which need to be replaced with hypervisor calls. For the moment, this simply includes no_paravirt.h, where all the native implementations now live. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Zachary Amsden <zach@vmware.com>

(Andrew, please sit these in the -mm tree for cooking) Create a paravirt.h header for (almost) all the critical operations which need to be replaced with hypervisor calls. For the moment, this simply includes no_paravirt.h, where all the native implementations now live. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Zachary Amsden <zach@vmware.com>