Messages in this thread Patch in this message | | | Date | Sat, 23 Oct 2010 17:04:47 +0200 (CEST) | From | Thomas Gleixner <> | Subject | [GIT pull] x86 vm86 for 2.6.37 |
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Linus,
Please pull the latest x86-vm86-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-vm86-for-linus
Thanks,
tglx
------------------> Bart Oldeman (1): x86, vm86: Fix preemption bug for int1 debug and int3 breakpoint handlers.
arch/x86/kernel/traps.c | 1 + arch/x86/kernel/vm86_32.c | 10 ++++++++-- 2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 60788de..9f4edeb 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -575,6 +575,7 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code) if (regs->flags & X86_VM_MASK) { handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, 1); + preempt_conditional_cli(regs); return; } diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c index 5ffb562..61fb985 100644 --- a/arch/x86/kernel/vm86_32.c +++ b/arch/x86/kernel/vm86_32.c @@ -551,8 +551,14 @@ cannot_handle: int handle_vm86_trap(struct kernel_vm86_regs *regs, long error_code, int trapno) { if (VMPI.is_vm86pus) { - if ((trapno == 3) || (trapno == 1)) - return_to_32bit(regs, VM86_TRAP + (trapno << 8)); + if ((trapno == 3) || (trapno == 1)) { + KVM86->regs32->ax = VM86_TRAP + (trapno << 8); + /* setting this flag forces the code in entry_32.S to + call save_v86_state() and change the stack pointer + to KVM86->regs32 */ + set_thread_flag(TIF_IRET); + return 0; + } do_int(regs, trapno, (unsigned char __user *) (regs->pt.ss << 4), SP(regs)); return 0; }
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