From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [RFC PATCH 2/9] powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE]
Date: Sat, 7 Nov 2020 01:59:22 +1000 [thread overview]
Message-ID: <20201106155929.2246055-3-npiggin@gmail.com> (raw)
In-Reply-To: <20201106155929.2246055-1-npiggin@gmail.com>
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.
XXX: May need to make this radix-only opt. - might take SLB or HPT faults
on the context tracking, etc.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/exceptions-64s.S | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index ea7bb7cc0db1..ad9f51e49806 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1905,8 +1905,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
mtctr r10
bctr
.else
- li r10,MSR_RI
- mtmsrd r10,1 /* Set RI (EE=0) */
#ifdef CONFIG_RELOCATABLE
__LOAD_HANDLER(r10, system_call_common)
mtctr r10
--
2.23.0
next prev parent reply other threads:[~2020-11-06 16:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-06 15:59 [RFC PATCH 0/9] powerpc/64s: fast interrupt exit Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 1/9] powerpc/64s: syscall real mode entry use mtmsrd rather than rfid Nicholas Piggin
2020-11-06 15:59 ` Nicholas Piggin [this message]
2020-11-06 15:59 ` [RFC PATCH 3/9] powerpc/64s: introduce different functions to return from SRR vs HSRR interrupts Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 4/9] powerpc/64s: avoid reloading (H)SRR registers if they are still valid Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 5/9] powerpc/64: move interrupt return asm to interrupt_64.S Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 6/9] powerpc/64s: save one more register in the masked interrupt handler Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 7/9] powerpc/64s: allow alternate return locations for soft-masked interrupts Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 8/9] powerpc/64s: interrupt soft-enable race fix Nicholas Piggin
2020-11-06 15:59 ` [RFC PATCH 9/9] powerpc/64s: use interrupt restart table to speed up return from interrupt Nicholas Piggin
2020-11-07 10:35 ` [RFC PATCH 0/9] powerpc/64s: fast interrupt exit Christophe Leroy
2020-11-10 8:49 ` Nicholas Piggin
2020-11-10 11:31 ` Christophe Leroy
2020-11-11 4:49 ` Nicholas Piggin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201106155929.2246055-3-npiggin@gmail.com \
--to=npiggin@gmail.com \
--cc=linuxppc-dev@lists.ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).