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Date:   Wed, 31 Jan 2018 12:52:11 +0100
From:   Borislav Petkov <bp@suse.de>
To:     "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Christophe de Dinechin <christophe.de.dinechin@gmail.com>,
        Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        David Woodhouse <dwmw2@infradead.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Eduardo Habkost <ehabkost@redhat.com>,
        KarimAllah Ahmed <karahmed@amazon.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andi Kleen <ak@linux.intel.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Andy Lutomirski <luto@kernel.org>,
        Ashok Raj <ashok.raj@intel.com>,
        Asit Mallick <asit.k.mallick@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "H . Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>,
        Joerg Roedel <joro@8bytes.org>,
        Jun Nakajima <jun.nakajima@intel.com>,
        Laura Abbott <labbott@redhat.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
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        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        KVM list <kvm@vger.kernel.org>,
        the arch/x86 maintainers <x86@kernel.org>
Subject: Re: [RFC,05/10] x86/speculation: Add basic IBRS support
 infrastructure
Message-ID: <20180131115211.2cxz2xj6elv37p6t@pd.tnic>
References: <20180129201404.GA1588@localhost.localdomain>
 <1517257022.18619.30.camel@infradead.org>
 <20180129204256.GV25150@localhost.localdomain>
 <31415b7f-9c76-c102-86cd-6bf4e23e3aee@linux.intel.com>
 <1517259759.18619.38.camel@infradead.org>
 <CA+55aFxBh3LvsQq9wy313NQCn3iu+yuAmsi0zNVxWmGDUUds-A@mail.gmail.com>
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 <200C59E8-80F3-4FEC-BA3B-E6A56FA12C74@dinechin.org>
 <alpine.DEB.2.20.1801311111181.2293@nanos>
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On Wed, Jan 31, 2018 at 11:04:07AM +0000, Dr. David Alan Gilbert wrote:
> That half is the easy bit, we've already got that (thanks to Eduardo),
> QEMU has -IBRS variants of CPU types, so if you start a VM with
> -cpu Broadwell-IBRS

Eww, a CPU model with a specific feature bit. I hope you guys don't add
a model like that for every CPU feature.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--