From: Marc Zyngier <maz@kernel.org>
To: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, james.morse@arm.com,
suzuki.poulose@arm.com
Subject: Re: [PATCH 3/5] KVM: arm64: Rename __vcpu_sys_reg -> vcpu_sys_reg
Date: Wed, 14 Jul 2021 11:23:52 +0100 [thread overview]
Message-ID: <87k0lt6vnr.wl-maz@kernel.org> (raw)
In-Reply-To: <20210714095601.184854-4-alexandru.elisei@arm.com>
Hi Alex,
On Wed, 14 Jul 2021 10:55:59 +0100,
Alexandru Elisei <alexandru.elisei@arm.com> wrote:
>
> There are two macros to access a specific system register from a known
> kvm_cpu_context: __ctxt_sys_reg(), which returns a pointer to the register,
> and ctxt_sys_reg(), which deferences the pointer returned by
> __ctxt_sys_reg().
>
> __vcpu_sys_reg() serves a similar purpose, with the difference being that
> it takes a struct kvm_vcpu as a parameter. __vcpu_sys_reg(), although it
> looks like __ctxt_sys_reg(), it dereferences the pointer to the register,
> like ctxt_sys_reg() does, and indeed it is defined as an abstraction over
> ctxt_sys_reg().
>
> Let's remove this naming inconsistency by renaming __vcpu_sys_reg() to
> vcpu_sys_reg(), to make it clear it behaves like ctxt_sys_reg(), and not
> like __ctxt_sys_reg().
I can't say I'm keen on this change.
The leading underscores really are there to outline that *this is
dangerous*, as you really need to know which context you are in.
Dropping the leading '__' may give the false impression that this is
safe, and not actually a primitive that requires careful thinking
before use.
ctxt_sys_reg() is, on the other hand, clearly something that acts
solely on memory because it takes a context structure, and not a
vcpu. At least that's what the 'ctxt' prefix is supposed to convey
(not very successfully, apparently).
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-07-14 10:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 9:55 [PATCH 0/5] KVM: arm64: Cleanups and one optimization Alexandru Elisei
2021-07-14 9:55 ` [PATCH 1/5] KVM: arm64: Move vcpu_has_feature() to asm/kvm_host.h Alexandru Elisei
2021-07-14 9:55 ` [PATCH 2/5] KVM: arm64: Use vcpu_has_feature() to check the feature bits Alexandru Elisei
2021-07-14 9:55 ` [PATCH 3/5] KVM: arm64: Rename __vcpu_sys_reg -> vcpu_sys_reg Alexandru Elisei
2021-07-14 10:23 ` Marc Zyngier [this message]
2021-07-14 10:40 ` Alexandru Elisei
2021-07-14 9:56 ` [PATCH 4/5] KVM: arm64: Add __vcpu_sys_reg() Alexandru Elisei
2021-07-14 9:56 ` [PATCH 5/5] KVM: arm64: nVHE: Remove unneeded isb() when modifying PMSCR_EL1 Alexandru Elisei
2021-07-14 18:20 ` Will Deacon
2021-07-15 9:31 ` Alexandru Elisei
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=87k0lt6vnr.wl-maz@kernel.org \
--to=maz@kernel.org \
--cc=alexandru.elisei@arm.com \
--cc=james.morse@arm.com \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=suzuki.poulose@arm.com \
/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).