From c7245da6ae7e5208504ff027c4e0eec69b788651 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge <jeremy@goop.org> Date: Wed, 25 Jun 2008 00:19:27 -0400 Subject: x86/paravirt, 64-bit: don't restore user rsp within sysret There's no need to combine restoring the user rsp within the sysret pvop, so split it out. This makes the pvop's semantics closer to the machine instruction. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citirx.com> Cc: xen-devel <xen-devel@lists.xensource.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> --- arch/x86/kernel/entry_64.S | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/x86/kernel/entry_64.S') diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 0056bc4c61a9..18447a373fbd 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -59,8 +59,7 @@ #endif #ifdef CONFIG_PARAVIRT -ENTRY(native_usersp_sysret) - movq %gs:pda_oldrsp,%rsp +ENTRY(native_usergs_sysret) swapgs sysretq #endif /* CONFIG_PARAVIRT */ @@ -275,7 +274,8 @@ sysret_check: CFI_REGISTER rip,rcx RESTORE_ARGS 0,-ARG_SKIP,1 /*CFI_REGISTER rflags,r11*/ - USERSP_SYSRET + movq %gs:pda_oldrsp, %rsp + USERGS_SYSRET CFI_RESTORE_STATE /* Handle reschedules */ -- cgit v1.2.2