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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-06-25 08:19:28 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-08 15:15:52 +0400 |
| commit | 2be29982a08009c731307f4a39053b70ac4700da (patch) | |
| tree | f01fcf847f36b9da5cd87cefa7ee6c13d193077d /arch/x86/kernel/paravirt.c | |
| parent | c7245da6ae7e5208504ff027c4e0eec69b788651 (diff) | |
| download | linux-2be29982a08009c731307f4a39053b70ac4700da.tar.xz | |
x86/paravirt: add sysret/sysexit pvops for returning to 32-bit compatibility userspace
In a 64-bit system, we need separate sysret/sysexit operations to
return to a 32-bit userspace.
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>
Diffstat (limited to 'arch/x86/kernel/paravirt.c')
| -rw-r--r-- | arch/x86/kernel/paravirt.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index b0b17f0bc7e9..bf1067e89cad 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -141,7 +141,8 @@ unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf, ret = paravirt_patch_nop(); else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) || type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) || - type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret)) + type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret32) || + type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret64)) /* If operation requires a jmp, then jmp */ ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len); else @@ -193,7 +194,8 @@ static void native_flush_tlb_single(unsigned long addr) /* These are in entry.S */ extern void native_iret(void); extern void native_irq_enable_sysexit(void); -extern void native_usergs_sysret(void); +extern void native_usergs_sysret32(void); +extern void native_usergs_sysret64(void); static int __init print_banner(void) { @@ -329,10 +331,10 @@ struct pv_cpu_ops pv_cpu_ops = { .write_idt_entry = native_write_idt_entry, .load_sp0 = native_load_sp0, -#ifdef CONFIG_X86_32 .irq_enable_sysexit = native_irq_enable_sysexit, -#else - .usergs_sysret = native_usergs_sysret, +#ifdef CONFIG_X86_64 + .usergs_sysret32 = native_usergs_sysret32, + .usergs_sysret64 = native_usergs_sysret64, #endif .iret = native_iret, .swapgs = native_swapgs, |