From: Juergen Gross <jgross@suse.com>
To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
x86@kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: Re: [patch 3/3] x86/paravirt: Replace paravirt patch asm magic
Date: Thu, 25 Apr 2019 09:46:15 +0200 [thread overview]
Message-ID: <6da95feb-e8ea-0c9b-d4c1-fa3556d6026a@suse.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1904250921010.1762@nanos.tec.linutronix.de>
On 25/04/2019 09:22, Thomas Gleixner wrote:
> On Thu, 25 Apr 2019, Ingo Molnar wrote:
>>> +# else
>>> + .irq_restore_fl = { 0x50, 0x9d }, // push %eax; popf
>>> + .mmu_write_cr3 = { 0x0f, 0x22, 0xd8 }, // mov %eax, %cr3
>>> + .cpu_iret = { 0xcf }, // iret
>>> +# endif
>>
>> I think these open-coded hexa versions are somewhat fragile as well, how
>> about putting these into a .S file and controlling the sections in an LTO
>> safe manner there?
>>
>> That will also allow us to write proper asm, and global labels can be
>> used to extract the patchlets and their length?
>
> We are not changing these any other day and I really don't see a reason to
> have these things global just because.
What about generating the hex values from the Makefile using a temporary
.S file? This would make the result easy verifiable and I don't think
setting this up is too complicated.
Juergen
next prev parent reply other threads:[~2019-04-25 7:46 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-24 13:41 [patch 0/3] x86/paravirt: Rework paravirt patching Thomas Gleixner
2019-04-24 13:41 ` [patch 1/3] x86/paravirt: Remove bogus extern declarations Thomas Gleixner
2019-04-25 7:31 ` [tip:x86/paravirt] " tip-bot for Thomas Gleixner
2019-05-24 7:58 ` tip-bot for Thomas Gleixner
2019-04-24 13:41 ` [patch 2/3] x86/paravirt: Unify 32/64 bit patch code Thomas Gleixner
2019-04-25 7:32 ` [tip:x86/paravirt] " tip-bot for Thomas Gleixner
2019-05-24 8:00 ` [tip:x86/paravirt] x86/paravirt: Unify the 32/64 bit paravirt patching code tip-bot for Thomas Gleixner
2019-04-24 13:41 ` [patch 3/3] x86/paravirt: Replace paravirt patch asm magic Thomas Gleixner
2019-04-25 6:52 ` Ingo Molnar
2019-04-25 7:22 ` Thomas Gleixner
2019-04-25 7:46 ` Juergen Gross [this message]
2019-04-25 8:10 ` [PATCH] x86/paravirt: Match paravirt patchlet field definition ordering to initialization ordering Ingo Molnar
2019-04-25 9:17 ` [PATCH] x86/paravirt: Detect oversized patching bugs as they happen and BUG_ON() to avoid later crashes Ingo Molnar
2019-04-25 9:21 ` Peter Zijlstra
2019-04-25 9:50 ` x86/paravirt: Detect over-sized patching bugs in paravirt_patch_call() Ingo Molnar
2019-04-25 10:22 ` Peter Zijlstra
2019-04-25 10:57 ` Ingo Molnar
2019-04-25 11:30 ` Juergen Gross
2019-04-25 12:30 ` Juergen Gross
2019-04-25 11:40 ` Peter Zijlstra
2019-04-25 12:30 ` Peter Zijlstra
2019-05-24 7:59 ` [tip:x86/paravirt] " tip-bot for Ingo Molnar
2019-05-24 7:58 ` [tip:x86/paravirt] x86/paravirt: Detect over-sized patching bugs in paravirt_patch_insns() tip-bot for Ingo Molnar
2019-05-24 8:01 ` [tip:x86/paravirt] x86/paravirt: Match paravirt patchlet field definition ordering to initialization ordering tip-bot for Ingo Molnar
2019-04-25 8:08 ` [patch 3/3] x86/paravirt: Replace paravirt patch asm magic Peter Zijlstra
2019-04-25 8:19 ` Peter Zijlstra
2019-04-25 9:20 ` Ingo Molnar
2019-05-24 8:00 ` [tip:x86/paravirt] x86/paravirt: Replace the " tip-bot for Thomas Gleixner
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