From: Nadav Amit <nadav.amit@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>,
"Haiyang Zhang" <haiyangz@microsoft.com>,
"Stephen Hemminger" <sthemmin@microsoft.com>,
"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"Roman Kagan" <rkagan@virtuozzo.com>
Subject: Re: [PATCH v2 1/4] x86/hyper-v: move synic/stimer control structures definitions to hyperv-tlfs.h
Date: Wed, 28 Nov 2018 09:55:37 -0800 [thread overview]
Message-ID: <B310522C-8D67-4143-8281-2C870A881F6B@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1811281404230.1532@nanos.tec.linutronix.de>
> On Nov 28, 2018, at 5:07 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
>
> On Wed, 28 Nov 2018, Vitaly Kuznetsov wrote:
>
>> Nadav Amit <nadav.amit@gmail.com> writes:
>>
>>> On a different note: how come all of the hyper-v structs are not marked
>>> with the “packed" attribute?
>>
>> "packed" should not be needed with proper padding; I vaguely remember
>> someone (from x86@?) arguing _against_ "packed".
>
> Packed needs to be used, when describing fixed format data structures in
> hardware or other ABIs, so the compiler cannot put alignment holes into
> them.
>
> Using packed for generic data structures might result in suboptimal layouts
> and prevents layout randomization.
Right, I forgot about the structs randomization. So at least for it, the
attribute should be needed.
To prevent conflicts, I think that this series should also add the
attribute in a first patch, which would be tagged for stable.
next prev parent reply other threads:[~2018-11-28 17:55 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-26 15:47 [PATCH v2 0/4] x86/kvm/hyper-v: Implement Direct Mode for synthetic timers Vitaly Kuznetsov
2018-11-26 15:47 ` [PATCH v2 1/4] x86/hyper-v: move synic/stimer control structures definitions to hyperv-tlfs.h Vitaly Kuznetsov
2018-11-26 17:00 ` Michael Kelley
2018-11-26 20:04 ` Roman Kagan
2018-11-27 13:10 ` Vitaly Kuznetsov
2018-11-27 15:52 ` Michael Kelley
2018-11-27 16:32 ` Vitaly Kuznetsov
2018-11-27 18:48 ` Roman Kagan
2018-11-28 1:49 ` Nadav Amit
2018-11-28 10:37 ` Vitaly Kuznetsov
2018-11-28 13:07 ` Thomas Gleixner
2018-11-28 17:55 ` Nadav Amit [this message]
2018-11-29 11:36 ` Vitaly Kuznetsov
2018-11-29 19:22 ` Thomas Gleixner
2018-11-29 7:52 ` Roman Kagan
2018-11-28 8:40 ` Paolo Bonzini
2018-11-26 15:47 ` [PATCH v2 2/4] x86/kvm/hyper-v: use stimer config definition from hyperv-tlfs.h Vitaly Kuznetsov
2018-11-26 15:47 ` [PATCH v2 3/4] x86/kvm/hyper-v: direct mode for synthetic timers Vitaly Kuznetsov
2018-11-26 16:44 ` Paolo Bonzini
2018-11-26 17:14 ` Vitaly Kuznetsov
2018-11-27 8:37 ` Roman Kagan
2018-11-27 13:54 ` Paolo Bonzini
2018-11-27 19:05 ` Roman Kagan
2018-11-28 8:43 ` Paolo Bonzini
2018-11-27 8:21 ` Roman Kagan
2018-12-03 17:12 ` Roman Kagan
2018-12-04 12:36 ` Vitaly Kuznetsov
2018-12-10 12:06 ` Roman Kagan
2018-12-10 12:54 ` Vitaly Kuznetsov
2018-12-10 13:21 ` Roman Kagan
2018-12-10 14:53 ` Vitaly Kuznetsov
2018-11-26 15:47 ` [PATCH v2 4/4] x86/kvm/hyper-v: avoid open-coding stimer_mark_pending() in kvm_hv_notify_acked_sint() Vitaly Kuznetsov
2018-11-26 16:45 ` Paolo Bonzini
2018-11-27 8:49 ` Roman Kagan
2018-11-26 16:45 ` [PATCH v2 0/4] x86/kvm/hyper-v: Implement Direct Mode for synthetic timers Paolo Bonzini
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