search for: set_tssldt_descriptor

.../include/asm-x86/desc.h b/include/asm-x86/desc.h index 8849666..e302a02 100644 --- a/include/asm-x86/desc.h +++ b/include/asm-x86/desc.h @@ -125,21 +125,6 @@ static inline void native_write_gdt_entry(struct desc_struct *gdt, int entry, memcpy(&gdt[entry], desc, size); } -static inline void set_tssldt_descriptor(struct ldttss_desc64 *d, - unsigned long tss, unsigned type, - unsigned size) -{ - memset(d, 0, sizeof(*d)); - d->limit0 = size & 0xFFFF; - d->base0 = PTR_LOW(tss); - d->base1 = PTR_MIDDLE(tss) & 0xFF; - d->type = type; - d->p = 1; - d->limit1 = (size >> 16...

.../include/asm-x86/desc.h b/include/asm-x86/desc.h index 8849666..e302a02 100644 --- a/include/asm-x86/desc.h +++ b/include/asm-x86/desc.h @@ -125,21 +125,6 @@ static inline void native_write_gdt_entry(struct desc_struct *gdt, int entry, memcpy(&gdt[entry], desc, size); } -static inline void set_tssldt_descriptor(struct ldttss_desc64 *d, - unsigned long tss, unsigned type, - unsigned size) -{ - memset(d, 0, sizeof(*d)); - d->limit0 = size & 0xFFFF; - d->base0 = PTR_LOW(tss); - d->base1 = PTR_MIDDLE(tss) & 0xFF; - d->type = type; - d->p = 1; - d->limit1 = (size >> 16...

...desc tss; > > - /* > - * sizeof(unsigned long) coming from an extra "long" at the end > - * of the iobitmap. See tss_struct definition in processor.h > - * > - * -1? seg base+limit should be pointing to the address of the > - * last valid byte > - */ > - set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, > - IO_BITMAP_OFFSET + IO_BITMAP_BYTES + > - sizeof(unsigned long) - 1); > + set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, TSS_LIMIT); > write_gdt_entry(d, entry, &tss, DESC_TSS); > } > > diff --...

...desc tss; > > - /* > - * sizeof(unsigned long) coming from an extra "long" at the end > - * of the iobitmap. See tss_struct definition in processor.h > - * > - * -1? seg base+limit should be pointing to the address of the > - * last valid byte > - */ > - set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, > - IO_BITMAP_OFFSET + IO_BITMAP_BYTES + > - sizeof(unsigned long) - 1); > + set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, TSS_LIMIT); > write_gdt_entry(d, entry, &tss, DESC_TSS); > } > > diff --...

Hi, this is a series of patches that unify the struct desc_struct and friends across x86_64 and i386. As usual, it provides paravirt capabilities as a side-effect for x86_64. I consider the main goal, namely, of unifying the desc_struct, an ongoing effort, being this the beginning. A lot of old code has to be touched to accomplish that. I don't consider this patch ready for inclusion.

Hi, this is a series of patches that unify the struct desc_struct and friends across x86_64 and i386. As usual, it provides paravirt capabilities as a side-effect for x86_64. I consider the main goal, namely, of unifying the desc_struct, an ongoing effort, being this the beginning. A lot of old code has to be touched to accomplish that. I don't consider this patch ready for inclusion.

...sc_struct *d = get_cpu_gdt_table(cpu); tss_desc tss; - /* - * sizeof(unsigned long) coming from an extra "long" at the end - * of the iobitmap. See tss_struct definition in processor.h - * - * -1? seg base+limit should be pointing to the address of the - * last valid byte - */ - set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, - IO_BITMAP_OFFSET + IO_BITMAP_BYTES + - sizeof(unsigned long) - 1); + set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, TSS_LIMIT); write_gdt_entry(d, entry, &tss, DESC_TSS); } diff --git a/arch/x86/include/asm/processo...

...sc_struct *d = get_cpu_gdt_table(cpu); tss_desc tss; - /* - * sizeof(unsigned long) coming from an extra "long" at the end - * of the iobitmap. See tss_struct definition in processor.h - * - * -1? seg base+limit should be pointing to the address of the - * last valid byte - */ - set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, - IO_BITMAP_OFFSET + IO_BITMAP_BYTES + - sizeof(unsigned long) - 1); + set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, TSS_LIMIT); write_gdt_entry(d, entry, &tss, DESC_TSS); } diff --git a/arch/x86/include/asm/processo...

...d be pointing to the address of the > - * last valid byte I think it might be better to keep at least a minimal comment near the TSS_LIMIT declaration, just to explain the "-1" part, which is not entirely obvious from just reading the code. -Kees > - */ > - set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, > - IO_BITMAP_OFFSET + IO_BITMAP_BYTES + > - sizeof(unsigned long) - 1); > + set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, TSS_LIMIT); > write_gdt_entry(d, ent...

...d be pointing to the address of the > - * last valid byte I think it might be better to keep at least a minimal comment near the TSS_LIMIT declaration, just to explain the "-1" part, which is not entirely obvious from just reading the code. -Kees > - */ > - set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, > - IO_BITMAP_OFFSET + IO_BITMAP_BYTES + > - sizeof(unsigned long) - 1); > + set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, TSS_LIMIT); > write_gdt_entry(d, ent...

...rch/x86/kernel/head64.c @@ -523,6 +523,19 @@ void __head early_idt_setup_early_handler(unsigned long physaddr) } } +void __head early_load_tss(void) +{ + struct desc_struct *gdt = (struct desc_struct *)boot_gdt; + struct tss_struct *tss = this_cpu_ptr(&cpu_tss_rw); + tss_desc tss_desc; + + set_tssldt_descriptor(&tss_desc, (unsigned long)tss, DESC_TSS, + __KERNEL_TSS_LIMIT); + native_write_gdt_entry(gdt, GDT_ENTRY_TSS, &tss_desc, DESC_TSS); + + asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8)); +} + void __head early_idt_setup(unsigned long physbase) { gate_desc *idt =...

...ne void load_TLS(struct threa gdt[2] = t->tls_array[2]; } +static inline void native_set_ldt(const void *addr, + unsigned int entries) +{ + if (likely(entries == 0)) + __asm__ __volatile__ ("lldt %w0" :: "r" (0)); + else { + unsigned cpu = smp_processor_id(); + + set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_LDT], (unsigned long)addr, + DESC_LDT, entries * 8 - 1); + __asm__ __volatile__ ("lldt %w0"::"r" (GDT_ENTRY_LDT*8)); + } +} + /* * load one particular LDT into the current CPU */ -static inline void load_LDT_nolock (mm_context_t *pc, int...

...ne void load_TLS(struct threa gdt[2] = t->tls_array[2]; } +static inline void native_set_ldt(const void *addr, + unsigned int entries) +{ + if (likely(entries == 0)) + __asm__ __volatile__ ("lldt %w0" :: "r" (0)); + else { + unsigned cpu = smp_processor_id(); + + set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_LDT], (unsigned long)addr, + DESC_LDT, entries * 8 - 1); + __asm__ __volatile__ ("lldt %w0"::"r" (GDT_ENTRY_LDT*8)); + } +} + /* * load one particular LDT into the current CPU */ -static inline void load_LDT_nolock (mm_context_t *pc, int...

This patch series makes it possible to compile out the iopl and ioperm system calls, which allow privileged processes to request permission to directly poke I/O ports from userspace. Nothing on a modern Linux system uses these calls anymore, and anything new should be using /dev/port instead, or better yet writing a driver. Copying the bloat-o-meter stats from the final patch: 32-bit

This patch series makes it possible to compile out the iopl and ioperm system calls, which allow privileged processes to request permission to directly poke I/O ports from userspace. Nothing on a modern Linux system uses these calls anymore, and anything new should be using /dev/port instead, or better yet writing a driver. Copying the bloat-o-meter stats from the final patch: 32-bit

The 32-bit and 64-bit versions of copy_thread have functionally identical handling for copying the I/O bitmap, modulo differences in error handling. Clean up the error paths in both by moving the copy of the I/O bitmap to the end, to eliminate the need to free it if subsequent copy steps fail; move the resulting identical code to a static inline in a common header. Signed-off-by: Josh Triplett

The 32-bit and 64-bit versions of copy_thread have functionally identical handling for copying the I/O bitmap, modulo differences in error handling. Clean up the error paths in both by moving the copy of the I/O bitmap to the end, to eliminate the need to free it if subsequent copy steps fail; move the resulting identical code to a static inline in a common header. Signed-off-by: Josh Triplett

This patch series makes it possible to compile out the userspace IO system calls, iopl and ioperm. The first patch does some 32/64 unification in copy_thread to make subsequent changes easier. The second patch simplifies the complex calculation of the TSS segment limit, which also makes it easier to change in the last patch. Patches 3-9 introduce helpers to make it easier to compile out IO.

This patch series makes it possible to compile out the userspace IO system calls, iopl and ioperm. The first patch does some 32/64 unification in copy_thread to make subsequent changes easier. The second patch simplifies the complex calculation of the TSS segment limit, which also makes it easier to change in the last patch. Patches 3-9 introduce helpers to make it easier to compile out IO.

The 32-bit and 64-bit versions of copy_thread have functionally identical handling for copying the I/O bitmap, modulo differences in error handling. Clean up the error paths in both by moving the copy of the I/O bitmap to the end, to eliminate the need to free it if subsequent copy steps fail; move the resulting identical code to a static inline in a common header. Signed-off-by: Josh Triplett