search for: tss_desc

...kernel/head64.c +++ b/arch/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 l...

Hi Josh, On Tue, Oct 22, 2013, at 3:34, Josh Triplett wrote: > __set_tss_desc has a complex calculation of the TSS segment limit, > duplicating the quirky details of the I/O bitmap array length, and > requiring a complex comment to explain. Replace that calculation with a > simpler one based on the offsetof the "stack" field that follows the > array. &...

Hi Josh, On Tue, Oct 22, 2013, at 3:34, Josh Triplett wrote: > __set_tss_desc has a complex calculation of the TSS segment limit, > duplicating the quirky details of the I/O bitmap array length, and > requiring a complex comment to explain. Replace that calculation with a > simpler one based on the offsetof the "stack" field that follows the > array. &...

On Mon, Oct 21, 2013 at 7:34 PM, Josh Triplett <josh at joshtriplett.org> wrote: > __set_tss_desc has a complex calculation of the TSS segment limit, > duplicating the quirky details of the I/O bitmap array length, and > requiring a complex comment to explain. Replace that calculation with a > simpler one based on the offsetof the "stack" field that follows the > array. &...

On Mon, Oct 21, 2013 at 7:34 PM, Josh Triplett <josh at joshtriplett.org> wrote: > __set_tss_desc has a complex calculation of the TSS segment limit, > duplicating the quirky details of the I/O bitmap array length, and > requiring a complex comment to explain. Replace that calculation with a > simpler one based on the offsetof the "stack" field that follows the > array. &...

...s_setup_io_bitmap(struct tss_struct *tss) #endif } +void tss_setup(int cpu) +{ + struct tss_struct *tss = per_cpu_ptr(&cpu_tss_rw, cpu); + struct cpu_entry_area *cea = get_cpu_entry_area(cpu); + + /* Initialize the TSS for cpu. */ + tss_setup_ist(tss, cea); + tss_setup_io_bitmap(tss); + set_tss_desc(cpu, &cea->tss.x86_tss); +} + /* * cpu_init() initializes state that is per-CPU. Some data is already * initialized (naturally) in the bootstrap process, such as the GDT @@ -1862,7 +1872,6 @@ static inline void tss_setup_io_bitmap(struct tss_struct *tss) */ void cpu_init(void) { - s...

...e/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) & 0xF; - d-&g...

...e/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) & 0xF; - d-&g...

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.

__set_tss_desc has a complex calculation of the TSS segment limit, duplicating the quirky details of the I/O bitmap array length, and requiring a complex comment to explain. Replace that calculation with a simpler one based on the offsetof the "stack" field that follows the array. That then removes th...

__set_tss_desc has a complex calculation of the TSS segment limit, duplicating the quirky details of the I/O bitmap array length, and requiring a complex comment to explain. Replace that calculation with a simpler one based on the offsetof the "stack" field that follows the array. That then removes th...

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

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