Zachary Amsden a520112930 [PATCH] x86: make IOPL explicit ... The pushf/popf in switch_to are ONLY used to switch IOPL. Making this explicit in C code is more clear. This pushf/popf pair was added as a bugfix for leaking IOPL to unprivileged processes when using sysenter/sysexit based system calls (sysexit does not restore flags). When requesting an IOPL change in sys_iopl(), it is just as easy to change the current flags and the flags in the stack image (in case an IRET is required), but there is no reason to force an IRET if we came in from the SYSENTER path. This change is the minimal solution for supporting a paravirtualized Linux kernel that allows user processes to run with I/O privilege. Other solutions require radical rewrites of part of the low level fault / system call handling code, or do not fully support sysenter based system calls. Unfortunately, this added one field to the thread_struct. But as a bonus, on P4, the fastest time measured for switch_to() went from 312 to 260 cycles, a win of about 17% in the fast case through this performance critical path. Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2005-09-05 00:06:12 -07:00
..
boot	[PATCH] coverity: i386: build.c: negative return to unsigned fix	2005-06-28 21:20:33 -07:00
crypto	[PATCH] arch/i386/crypto/aes.c: fix sparse warnings	2005-06-25 16:24:59 -07:00
kernel	[PATCH] x86: make IOPL explicit	2005-09-05 00:06:12 -07:00
lib	[PATCH] Remove i386_ksyms.c, almost.	2005-06-23 09:45:11 -07:00
mach-default	[PATCH] x86_64: CPU hotplug support	2005-06-25 16:24:30 -07:00
mach-es7000	[PATCH] ES7000 platform update (i386)	2005-09-05 00:06:10 -07:00
mach-generic	[PATCH] x86: sutomatically enable bigsmp when we have more than 8 CPUs	2005-09-05 00:06:10 -07:00
mach-visws	[PATCH] visws: linkage fix	2005-08-07 10:00:38 -07:00
mach-voyager	[PATCH] x86: more asm cleanups	2005-09-05 00:06:12 -07:00
math-emu	[PATCH] i386: inline assembler: cleanup and encapsulate descriptor and task register management	2005-09-05 00:06:11 -07:00
mm	[PATCH] i386: use set_pte macros in a couple places where they were missing	2005-09-05 00:06:12 -07:00
oprofile	[PATCH] xen: x86: Rename usermode macro	2005-06-23 09:45:14 -07:00
pci	[PATCH] x86: pci_assign_unassigned_resources() update	2005-08-30 11:14:48 -07:00
power	[PATCH] i386: inline assembler: cleanup and encapsulate descriptor and task register management	2005-09-05 00:06:11 -07:00
defconfig	[PATCH] swsusp: kill config_pm_disk	2005-06-25 16:24:32 -07:00
Kconfig	[PATCH] sparsemem extreme implementation	2005-09-05 00:05:38 -07:00
Kconfig.debug	[PATCH] i386: add missing Kconfig help text	2005-07-27 16:25:58 -07:00
Makefile	[PATCH] biarch compiler support for i386	2005-06-23 09:45:07 -07:00