From: Paolo Bonzini <pbonzini@redhat.com>
To: Bandan Das <bsd@redhat.com>, kvm@vger.kernel.org
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
Gleb Natapov <gleb@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 3/6] KVM: emulate: cleanup decode_rm
Date: Sun, 13 Apr 2014 08:51:03 -0400 [thread overview]
Message-ID: <534A8837.8010308@redhat.com> (raw)
In-Reply-To: <1397174612-17373-4-git-send-email-bsd@redhat.com>
Il 10/04/2014 20:03, Bandan Das ha scritto:
> - if (ctxt->rex_prefix) {
> - ctxt->modrm_reg = (ctxt->rex_prefix & 4) << 1; /* REX.R */
> - index_reg = (ctxt->rex_prefix & 2) << 2; /* REX.X */
> - ctxt->modrm_rm = base_reg = (ctxt->rex_prefix & 1) << 3; /* REG.B */
> - }
> + index_reg = (ctxt->rex_prefix << 2) & 8; /* REX.X */
> + base_reg = (ctxt->rex_prefix << 3) & 8; /* REG.B */
This is REX.B (preexisting typo), and please leave REX.R here too for
clarity.
Also, the function is "decode_modrm", not "decode_rm" (in the commit
message).
Otherwise the series seems okay from a somewhat cursory review.
Paolo
>
> - ctxt->modrm_mod |= (ctxt->modrm & 0xc0) >> 6;
> - ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3;
> - ctxt->modrm_rm |= (ctxt->modrm & 0x07);
> + ctxt->modrm_mod = (ctxt->modrm & 0xc0) >> 6;
> + ctxt->modrm_reg = ((ctxt->rex_prefix << 1) & 8) | /* REX.R */
> + ((ctxt->modrm & 0x38) >> 3);
> + ctxt->modrm_rm = base_reg | (ctxt->modrm & 0x07);
> ctxt->modrm_seg = VCPU_SREG_DS;
>
next prev parent reply other threads:[~2014-04-13 12:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-11 0:03 [RFC PATCH v2 0/6] Emulator speedups - avoid initializations where possible Bandan Das
2014-04-11 0:03 ` [RFC PATCH v2 1/6] KVM: emulate: move init_decode_cache to emulate.c Bandan Das
2014-04-11 0:03 ` [RFC PATCH v2 2/6] KVM: emulate: Remove ctxt->intercept and ctxt->check_perm checks Bandan Das
2014-04-11 0:03 ` [RFC PATCH v2 3/6] KVM: emulate: cleanup decode_rm Bandan Das
2014-04-13 12:51 ` Paolo Bonzini [this message]
2014-04-11 0:03 ` [RFC PATCH v2 4/6] KVM: emulate: clean up initializations in init_decode_cache Bandan Das
2014-04-11 0:03 ` [RFC PATCH v2 5/6] KVM: emulate: rework seg_override Bandan Das
2014-04-11 0:03 ` [RFC PATCH v2 6/6] KVM: emulate: remove memopp and rip_relative Bandan Das
2014-04-13 12:48 ` Paolo Bonzini
2014-04-14 14:01 ` Bandan Das
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=534A8837.8010308@redhat.com \
--to=pbonzini@redhat.com \
--cc=bsd@redhat.com \
--cc=gleb@kernel.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mtosatti@redhat.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.