Messages in this thread | | | From | Lai Jiangshan <> | Date | Thu, 18 Jun 2020 21:52:02 +0800 | Subject | Re: [PATCH V2 0/4] x86/entry: simply stack switching when exception on userspace |
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Hello and Ping
On Tue, Jun 16, 2020 at 9:56 AM Lai Jiangshan <jiangshanlai+lkml@gmail.com> wrote: > > On Sat, May 30, 2020 at 2:33 AM Andy Lutomirski <luto@kernel.org> wrote: > > > > On Fri, May 29, 2020 at 1:26 AM Lai Jiangshan <laijs@linux.alibaba.com> wrote: > > > > > > 7f2590a110b8("x86/entry/64: Use a per-CPU trampoline stack for IDT entries") > > > has resulted that when exception on userspace, the kernel (error_entry) > > > always push the pt_regs to entry stack(sp0), and then copy them to the > > > kernel stack.
Ping Andy Lutomirski for having added the overhead two years ago.
> > > > > > And recent x86/entry work makes interrupt also use idtentry > > > and makes all the interrupt code save the pt_regs on the sp0 stack > > > and then copy it to the thread stack like exception. > > >
Ping Thomas Gleixner for having added the overhead recently.
> > Hello, All > > This patchset can be smoothly applicable to the newest tip/x86/entry > which has 5.8-rc1 merged. Which means I don't have to respin/resend it > until any update is needed. > > Could you have a review on it please. > > Thanks > Lai
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