[PATCH 00/14] powerpc/64: fast interrupt exits · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 01/14] powerpc: remove interrupt exit helpers unused argument · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
Re: [PATCH 01/14] powerpc: remove interrupt exit helpers unused argument · Christophe Leroy <hidden> · 2021-05-17
[PATCH 02/14] powerpc/64s: security fallback improvement · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 04/14] powerpc/64s: avoid reloading (H)SRR registers if they are still valid · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
Re: [PATCH 04/14] powerpc/64s: avoid reloading (H)SRR registers if they are still valid · Michael Ellerman <mpe@ellerman.id.au> · 2021-04-02
Re: [PATCH 04/14] powerpc/64s: avoid reloading (H)SRR registers if they are still valid · Nicholas Piggin <npiggin@gmail.com> · 2021-04-04
Re: [PATCH 04/14] powerpc/64s: avoid reloading (H)SRR registers if they are still valid · Michael Ellerman <mpe@ellerman.id.au> · 2021-04-03
Re: [PATCH 04/14] powerpc/64s: avoid reloading (H)SRR registers if they are still valid · Nicholas Piggin <npiggin@gmail.com> · 2021-04-04
[PATCH 03/14] powerpc/64s: introduce different functions to return from SRR vs HSRR interrupts · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 05/14] powerpc/64: move interrupt return asm to interrupt_64.S · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 06/14] powerpc/64s: save one more register in the masked interrupt handler · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 07/14] powerpc/64: allow alternate return locations for soft-masked interrupts · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 08/14] powerpc/64: interrupt soft-enable race fix · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 09/14] powerpc/64: treat low kernel text as irqs soft-masked · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 10/14] powerpc/64: use interrupt restart table to speed up return from interrupt · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
Re: [PATCH 10/14] powerpc/64: use interrupt restart table to speed up return from interrupt · Christophe Leroy <hidden> · 2021-03-16
Re: [PATCH 10/14] powerpc/64: use interrupt restart table to speed up return from interrupt · Nicholas Piggin <npiggin@gmail.com> · 2021-03-16
[PATCH 11/14] powerpc/64e: Remove PPR from pt_regs · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 12/14] powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE] · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
Re: [PATCH 12/14] powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE] · Christophe Leroy <hidden> · 2021-03-16
Re: [PATCH 12/14] powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE] · Nicholas Piggin <npiggin@gmail.com> · 2021-03-16
Re: [PATCH 12/14] powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE] · Michael Ellerman <mpe@ellerman.id.au> · 2021-03-19
[PATCH 13/14] powerpc/64: handle MSR EE and RI in interrupt entry wrapper · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
[PATCH 14/14] powerpc/64s: use the same default PPR for user and kernel · Nicholas Piggin <npiggin@gmail.com> · 2021-03-15
Re: [PATCH 14/14] powerpc/64s: use the same default PPR for user and kernel · Christophe Leroy <hidden> · 2021-05-17

Re: [PATCH 12/14] powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE]

From: Nicholas Piggin <npiggin@gmail.com>
Date: 2021-03-16 08:14:33

Excerpts from Christophe Leroy's message of March 16, 2021 5:21 pm:


Le 15/03/2021 à 23:04, Nicholas Piggin a écrit :

quoted

This extends the MSR[RI]=0 window a little further into the system
call in order to pair RI and EE enabling with a single mtmsrd.

Time ago, I proposed to delay that on PPC32 and Michael objected, see 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/9f9dd859d571e324c7412ed9db9da8cfba678257.1548956511.git.christophe.leroy@c-s.fr/

Yeah, it is a concern. The speedup should be at least 5% I think on
64s (have not measured in isolation yet), so might be worth it.

We'll see.

Thanks,
Nick

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