Boris Ostrovsky 5fdf5d37f4 x86/xen: Avoid fast syscall path for Xen PV guests ... After 32-bit syscall rewrite, and specifically after commit: 5f310f739b ("x86/entry/32: Re-implement SYSENTER using the new C path") ... the stack frame that is passed to xen_sysexit is no longer a "standard" one (i.e. it's not pt_regs). Since we end up calling xen_iret from xen_sysexit we don't need to fix up the stack and instead follow entry_SYSENTER_32's IRET path directly to xen_iret. We can do the same thing for compat mode even though stack does not need to be fixed. This will allow us to drop usergs_sysret32 paravirt op (in the subsequent patch) Suggested-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: Borislav Petkov <bp@suse.de> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: david.vrabel@citrix.com Cc: konrad.wilk@oracle.com Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1447970147-1733-2-git-send-email-boris.ostrovsky@oracle.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-11-23 10:48:16 +01:00
..
syscalls	mm: mlock: add new mlock system call	2015-11-05 19:34:48 -08:00
vdso	Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-03 21:23:56 -08:00
vsyscall	x86/entry/vsyscall: Fix undefined symbol warning	2015-09-21 09:56:59 +02:00
calling.h	x86/asm/entry/64: Save all regs on interrupt entry	2015-07-07 10:59:07 +02:00
common.c	x86/entry/32: Fix entry_INT80_32() to expect interrupts to be on	2015-10-18 12:11:16 +02:00
entry_32.S	x86/xen: Avoid fast syscall path for Xen PV guests	2015-11-23 10:48:16 +01:00
entry_64_compat.S	x86/xen: Avoid fast syscall path for Xen PV guests	2015-11-23 10:48:16 +01:00
entry_64.S	x86/entry/64/compat: Migrate the body of the syscall entry to C	2015-10-09 09:41:09 +02:00
Makefile	x86/entry: Move C entry and exit code to arch/x86/entry/common.c	2015-07-07 10:59:05 +02:00
syscall_32.c	x86/syscalls: Give sys_call_ptr_t a useful type	2015-10-09 09:41:08 +02:00
syscall_64.c	x86/syscalls: Give sys_call_ptr_t a useful type	2015-10-09 09:41:08 +02:00
thunk_32.S	Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-06-22 17:59:09 -07:00
thunk_64.S	Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-06-22 17:59:09 -07:00