From: Paolo Bonzini <pbonzini@redhat.com>
To: Nadav Amit <namit@cs.technion.ac.il>, mtosatti@redhat.com, hpa@zytor.com
Cc: gleb@kernel.org, tglx@linutronix.de, mingo@redhat.com,
x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/5] KVM: x86: Wrong register masking in 64-bit mode
Date: Wed, 07 May 2014 17:52:35 +0200 [thread overview]
Message-ID: <536A56C3.7050907@redhat.com> (raw)
In-Reply-To: <1399465972-4026-5-git-send-email-namit@cs.technion.ac.il>
Il 07/05/2014 14:32, Nadav Amit ha scritto:
> 32-bit operations are zero extended in 64-bit mode. Currently, the code does
> not handle them correctly and keeps the high bits. In 16-bit mode, the high
> 32-bits are kept intact.
>
> In addition, although it is not well-documented, when address override prefix
> is used with REP-string instruction, RCX high half is zeroed even if ECX was
> zero on the first iteration (as if an assignment was performed to ECX).
Is this true even for REPZ and ZF=0 or REPNZ and ZF=1?
Paolo
next prev parent reply other threads:[~2014-05-07 15:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-07 12:32 [PATCH 0/5] KVM: x86: Fix exit handler and emulation bugs Nadav Amit
2014-05-07 12:32 ` [PATCH 1/5] KVM: x86: Emulator does not calculate address correctly Nadav Amit
2014-05-07 13:57 ` Paolo Bonzini
2014-05-07 15:21 ` Nadav Amit
2014-05-07 12:32 ` [PATCH 2/5] KVM: vmx: handle_dr does not handle RSP correctly Nadav Amit
2014-05-07 12:32 ` [PATCH 3/5] KVM: x86: Mark bit 7 in long-mode PDPTE according to 1GB pages support Nadav Amit
2014-05-07 12:32 ` [PATCH 4/5] KVM: x86: Wrong register masking in 64-bit mode Nadav Amit
2014-05-07 14:50 ` Bandan Das
2014-05-07 15:24 ` Paolo Bonzini
2014-05-07 16:11 ` Nadav Amit
2014-05-07 15:52 ` Paolo Bonzini [this message]
2014-05-08 12:27 ` Nadav Amit
2014-05-07 12:32 ` [PATCH 5/5] KVM: x86: Fix wrong masking on relative jump/call Nadav Amit
2014-05-07 14:43 ` Bandan Das
2014-05-07 15:57 ` Nadav Amit
2014-05-07 15:59 ` Paolo Bonzini
2014-05-07 16:00 ` [PATCH 0/5] KVM: x86: Fix exit handler and emulation bugs Paolo Bonzini
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=536A56C3.7050907@redhat.com \
--to=pbonzini@redhat.com \
--cc=gleb@kernel.org \
--cc=hpa@zytor.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=mtosatti@redhat.com \
--cc=namit@cs.technion.ac.il \
--cc=tglx@linutronix.de \
--cc=x86@kernel.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 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.