diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 1d9b4a300c8c..f95dcb209fdf 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1189,15 +1189,13 @@ ENTRY(paranoid_entry) 1: /* * Always stash CR3 in %r14. This value will be restored, - * verbatim, at exit. Needed if kernel is interrupted - * after switching to the user CR3 value but before - * returning to userspace. + * verbatim, at exit. Needed if paranoid_entry interrupted + * another entry that already switched to the user CR3 value + * but has not yet returned to userspace. * * This is also why CS (stashed in the "iret frame" by the * hardware at entry) can not be used: this may be a return - * to kernel code, but with a user CR3 value. The %ebx flag - * for SWAPGS is also unusable for CR3 because there is a - * window with a user GS and a kernel CR3. + * to kernel code, but with a user CR3 value. */ SAVE_AND_SWITCH_TO_KERNEL_CR3 scratch_reg=%rax save_reg=%r14 |