x86_64: LRET to userspace
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- v1 Latest2 patches 2 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | x86_64,entry,xen: Do not invoke espfix64 on Xenarch/ arch/ arch/ | +11 | 2 replies | |
| 2/2 | x86_64,entry: Use lret to return to userspace when possiblearch/ arch/ arch/ +3 more | +126 | 0 replies |
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Cover letter [PATCH 0/2] x86_64: LRET to userspace
This series is based on tip/perf/urgent. It should apply to any recent kernel, but my test case [1] will OOPS without the fix in tip/perf/urgent.
The first patch or something like it is needed for 3.16, regardless of any lret hackery -- I think it's making its way toward a pull request this week, but I haven't seen it land in -tip yet.
I'm repeating it here because the LRET stuff won't work on paravirt, and patch 1 puts the machinery for that in place.
tl;dr Read patch 2. To test, apply patch 1 and consider basing on tip/perf/urgent.
[1] sigreturn_32 from https://gitorious.org/linux-test-utils/linux-clock-tests/
Andy Lutomirski (2):
x86_64,entry,xen: Do not invoke espfix64 on Xen x86_64,entry: Use lret to return to userspace when possible
arch/x86/include/asm/irqflags.h | 3 +- arch/x86/include/asm/paravirt.h | 4 ++ arch/x86/include/asm/traps.h | 6 ++ arch/x86/kernel/cpu/mcheck/mce.c | 2 + arch/x86/kernel/entry_64.S | 121 ++++++++++++++++++++++++++++++------ arch/x86/kernel/nmi.c | 21 +++++++ arch/x86/kernel/paravirt_patch_64.c | 2 - 7 files changed, 136 insertions(+), 23 deletions(-)
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