search for: io_bitmap_longs

.../arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -255,7 +255,11 @@ struct x86_hw_tss { /* * IO-bitmap sizes: */ +#ifdef CONFIG_X86_IOPORT #define IO_BITMAP_BITS 65536 +#else +#define IO_BITMAP_BITS 0 +#endif #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define INVALID_IO_BITMAP_OFFSET 0x8000 @@ -269,6 +273,7 @@ struct tss_struct { */ struct x86_hw_tss x86_tss; +#ifdef CONFIG_X86_IOPORT /* * The extra 1 is there because the CPU will access an * additional byte beyond the end of the IO permission @@...

.../arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -255,7 +255,11 @@ struct x86_hw_tss { /* * IO-bitmap sizes: */ +#ifdef CONFIG_X86_IOPORT #define IO_BITMAP_BITS 65536 +#else +#define IO_BITMAP_BITS 0 +#endif #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define INVALID_IO_BITMAP_OFFSET 0x8000 @@ -269,6 +273,7 @@ struct tss_struct { */ struct x86_hw_tss x86_tss; +#ifdef CONFIG_X86_IOPORT /* * The extra 1 is there because the CPU will access an * additional byte beyond the end of the IO permission @@...

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

.../arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -256,7 +256,11 @@ struct x86_hw_tss { /* * IO-bitmap sizes: */ +#ifdef CONFIG_X86_IOPORT #define IO_BITMAP_BITS 65536 +#else +#define IO_BITMAP_BITS 0 +#endif #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define INVALID_IO_BITMAP_OFFSET 0x8000 @@ -269,6 +273,7 @@ struct tss_struct { */ struct x86_hw_tss x86_tss; +#ifdef CONFIG_X86_IOPORT /* * The extra 1 is there because the CPU will access an * additional byte beyond the end of the IO permission @@...

.../arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -256,7 +256,11 @@ struct x86_hw_tss { /* * IO-bitmap sizes: */ +#ifdef CONFIG_X86_IOPORT #define IO_BITMAP_BITS 65536 +#else +#define IO_BITMAP_BITS 0 +#endif #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define INVALID_IO_BITMAP_OFFSET 0x8000 @@ -270,6 +274,7 @@ struct tss_struct { */ struct x86_hw_tss x86_tss; +#ifdef CONFIG_X86_IOPORT /* * The extra 1 is there because the CPU will access an * additional byte beyond the end of the IO permission @@...

...e/asm/processor.h > @@ -256,7 +256,11 @@ struct x86_hw_tss { > /* > * IO-bitmap sizes: > */ > +#ifdef CONFIG_X86_IOPORT > #define IO_BITMAP_BITS 65536 > +#else > +#define IO_BITMAP_BITS 0 > +#endif > #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) > #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) > #define INVALID_IO_BITMAP_OFFSET 0x8000 > @@ -269,6 +273,7 @@ struct tss_struct { > */ > struct x86_hw_tss x86_tss; > > +#ifdef CONFIG_X86_IOPORT > /* > * The extra 1 is there because the CPU will access an > * additional...

...e/asm/processor.h > @@ -256,7 +256,11 @@ struct x86_hw_tss { > /* > * IO-bitmap sizes: > */ > +#ifdef CONFIG_X86_IOPORT > #define IO_BITMAP_BITS 65536 > +#else > +#define IO_BITMAP_BITS 0 > +#endif > #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) > #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) > #define INVALID_IO_BITMAP_OFFSET 0x8000 > @@ -269,6 +273,7 @@ struct tss_struct { > */ > struct x86_hw_tss x86_tss; > > +#ifdef CONFIG_X86_IOPORT > /* > * The extra 1 is there because the CPU will access an > * additional...

...t x86_hw_tss { > /* > * IO-bitmap sizes: > */ > +#ifdef CONFIG_X86_IOPORT > #define IO_BITMAP_BITS 65536 > +#else > +#define IO_BITMAP_BITS 0 > +#endif > #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) > #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) > #define INVALID_IO_BITMAP_OFFSET 0x8000 > @@ -269,6 +273,7 @@ struct tss_struct { > */ > struct x86_hw_tss x86_tss; > > +#ifdef CONFIG_X86_IOPORT > /* > * The extra 1 is th...

...t x86_hw_tss { > /* > * IO-bitmap sizes: > */ > +#ifdef CONFIG_X86_IOPORT > #define IO_BITMAP_BITS 65536 > +#else > +#define IO_BITMAP_BITS 0 > +#endif > #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) > #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) > #define INVALID_IO_BITMAP_OFFSET 0x8000 > @@ -269,6 +273,7 @@ struct tss_struct { > */ > struct x86_hw_tss x86_tss; > > +#ifdef CONFIG_X86_IOPORT > /* > * The extra 1 is th...

...t x86_hw_tss { > /* > * IO-bitmap sizes: > */ > +#ifdef CONFIG_X86_IOPORT > #define IO_BITMAP_BITS 65536 > +#else > +#define IO_BITMAP_BITS 0 > +#endif > #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) > #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) > #define INVALID_IO_BITMAP_OFFSET 0x8000 > @@ -269,6 +273,7 @@ struct tss_struct { > */ > struct x86_hw_tss x86_tss; > > +#ifdef CONFIG_X86_IOPORT > /* > * The extra 1 is th...

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.

.../arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -255,7 +255,11 @@ struct x86_hw_tss { /* * IO-bitmap sizes: */ +#ifdef CONFIG_X86_IOPORT #define IO_BITMAP_BITS 65536 +#else +#define IO_BITMAP_BITS 0 +#endif #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define INVALID_IO_BITMAP_OFFSET 0x8000 @@ -269,6 +273,7 @@ struct tss_struct { */ struct x86_hw_tss x86_tss; +#ifdef CONFIG_X86_IOPORT /* * The extra 1 is there because the CPU will access an * additional byte beyond the end of the IO permission @@...

...gement tools have no choice but to > go the lrmi/io path. As with any userspace interface, some callers may potentially still exist. And this still has "default y", too, to avoid user surprises. > Still makes sense IMHO. > > From a code perspective however you could define IO_BITMAP_LONGS to 0, > add an IO_BITMAP_SIZE (defined as LONGS + 1 or 0) and as far as I can see > gcc would then optimise out a lot of the code you are ifdeffing IO_BITMAP_LONGS already gets defined to (0/sizeof(long)). And as far as I can tell, that would only work for init_tss_io, not anything else. Ev...

.../arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -255,7 +255,11 @@ struct x86_hw_tss { /* * IO-bitmap sizes: */ +#ifdef CONFIG_X86_IOPORT #define IO_BITMAP_BITS 65536 +#else +#define IO_BITMAP_BITS 0 +#endif #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define INVALID_IO_BITMAP_OFFSET 0x8000 @@ -269,6 +273,7 @@ struct tss_struct { */ struct x86_hw_tss x86_tss; +#ifdef CONFIG_X86_IOPORT /* * The extra 1 is there because the CPU will access an * additional byte beyond the end of the IO permission @@...

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