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authorZachary Amsden <zach@vmware.com>2005-09-03 15:56:44 -0700
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 00:06:12 -0700
commita5201129307f414890f9a4410e38da205f5d7359 (patch)
treead70c5f1d3b336ef5665a7fd5ad8707aaec23847 /include/asm-i386/system.h
parent0998e4228aca046fbd747c3fed909791d52e88eb (diff)
[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>
Diffstat (limited to 'include/asm-i386/system.h')
-rw-r--r--include/asm-i386/system.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h
index 37fd2f8c7196..acd5c26b69ba 100644
--- a/include/asm-i386/system.h
+++ b/include/asm-i386/system.h
@@ -14,8 +14,7 @@ extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev, struc
#define switch_to(prev,next,last) do { \
unsigned long esi,edi; \
- asm volatile("pushfl\n\t" \
- "pushl %%ebp\n\t" \
+ asm volatile("pushl %%ebp\n\t" \
"movl %%esp,%0\n\t" /* save ESP */ \
"movl %5,%%esp\n\t" /* restore ESP */ \
"movl $1f,%1\n\t" /* save EIP */ \
@@ -23,7 +22,6 @@ extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev, struc
"jmp __switch_to\n" \
"1:\t" \
"popl %%ebp\n\t" \
- "popfl" \
:"=m" (prev->thread.esp),"=m" (prev->thread.eip), \
"=a" (last),"=S" (esi),"=D" (edi) \
:"m" (next->thread.esp),"m" (next->thread.eip), \