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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

...@@ > #include <asm/debugreg.h> > #include <asm/nmi.h> > > +#include "process-io.h" > + > /* > * per-CPU TSS segments. Threads are completely 'soft' on Linux, > * no more per-task TSS's. The TSS size is kept cacheline-aligned > @@ -104,23 +106,7 @@ void arch_task_cache_init(void) > void exit_thread(void) > { > struct task_struct *me = current; > - struct thread_struct *t = &me->thread; > - unsigned long *bp = t->io_bitmap_ptr; > - > - if (bp) { > - struct...

...b/arch/x86/kernel/process.c @@ -29,6 +29,8 @@ #include <asm/debugreg.h> #include <asm/nmi.h> +#include "process-io.h" + /* * per-CPU TSS segments. Threads are completely 'soft' on Linux, * no more per-task TSS's. The TSS size is kept cacheline-aligned @@ -104,23 +106,7 @@ void arch_task_cache_init(void) void exit_thread(void) { struct task_struct *me = current; - struct thread_struct *t = &me->thread; - unsigned long *bp = t->io_bitmap_ptr; - - if (bp) { - struct tss_struct *tss = &per_cpu(init_tss, get_cpu()); - - t->io_bitmap_pt...

...b/arch/x86/kernel/process.c @@ -29,6 +29,8 @@ #include <asm/debugreg.h> #include <asm/nmi.h> +#include "process-io.h" + /* * per-CPU TSS segments. Threads are completely 'soft' on Linux, * no more per-task TSS's. The TSS size is kept cacheline-aligned @@ -104,23 +106,7 @@ void arch_task_cache_init(void) void exit_thread(void) { struct task_struct *me = current; - struct thread_struct *t = &me->thread; - unsigned long *bp = t->io_bitmap_ptr; - - if (bp) { - struct tss_struct *tss = &per_cpu(init_tss, get_cpu()); - - t->io_bitmap_pt...

These two patches were originally part of the XSM series that I have posted, and remain prerequisites for that series. However, they are independent of the XSM changes and are a useful simplification regardless of the use of XSM. The Acked-bys on these patches were provided before rebasing them over the copyback changes in 26268:1b72138bddda, which had minor conflicts that I resolved. [PATCH

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.

...22 +- include/xen/interface/xencomm.h | 41 ++ include/xen/page.h | 181 +------ include/xen/xen-ops.h | 6 + include/xen/xencomm.h | 77 +++ 93 files changed, 9174 insertions(+), 1049 deletions(-)

...22 +- include/xen/interface/xencomm.h | 41 ++ include/xen/page.h | 181 +------ include/xen/xen-ops.h | 6 + include/xen/xencomm.h | 77 +++ 93 files changed, 9174 insertions(+), 1049 deletions(-)