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From: "Jürgen Groß" <jgross@suse.com>
To: Brian Gerst <brgerst@gmail.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Deep Shah <sdeep@vmware.com>,
	"VMware, Inc." <pv-drivers@vmware.com>,
	the arch/x86 maintainers <x86@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Virtualization <virtualization@lists.linux-foundation.org>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Andy Lutomirski <luto@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	xen-devel <xen-devel@lists.xenproject.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH v2 0/4] Remove 32-bit Xen PV guest support
Date: Thu, 2 Jul 2020 17:45:23 +0200
Message-ID: <e277e875-c159-4281-e9b7-08c91882d1fb@suse.com> (raw)
In-Reply-To: <CAMzpN2hvK2T7Qje51MPjMyTggxT7_=EFnt7gAmJEa1Zq+t3LtA@mail.gmail.com>

On 02.07.20 16:48, Brian Gerst wrote:
> On Wed, Jul 1, 2020 at 7:07 AM Juergen Gross <jgross@suse.com> wrote:
>>
>> The long term plan has been to replace Xen PV guests by PVH. The first
>> victim of that plan are now 32-bit PV guests, as those are used only
>> rather seldom these days. Xen on x86 requires 64-bit support and with
>> Grub2 now supporting PVH officially since version 2.04 there is no
>> need to keep 32-bit PV guest support alive in the Linux kernel.
>> Additionally Meltdown mitigation is not available in the kernel running
>> as 32-bit PV guest, so dropping this mode makes sense from security
>> point of view, too.
> 
> One thing that you missed is removing VDSO_NOTE_NONEGSEG_BIT from
> vdso32/note.S.  With that removed there is no difference from the
> 64-bit version.

Oh, this means we can probably remove arch/x86/xen/vdso.h completely.

> 
> Otherwise this series looks good to me.

Thanks,


Juergen


      reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-01 11:06 Juergen Gross
2020-07-01 11:06 ` [PATCH v2 1/4] x86/xen: remove " Juergen Gross
2020-07-01 16:33   ` Brian Gerst
2020-07-02 22:59   ` Boris Ostrovsky
2020-07-02 23:24     ` Andrew Cooper
2020-07-02 23:27       ` Boris Ostrovsky
2020-07-03  5:15     ` Jürgen Groß
2020-07-01 11:06 ` [PATCH v2 2/4] x86/paravirt: remove 32-bit support from PARAVIRT_XXL Juergen Gross
2020-07-01 11:06 ` [PATCH v2 3/4] x86/paravirt: cleanup paravirt macros Juergen Gross
2020-07-01 11:06 ` [PATCH v2 4/4] x86/paravirt: use CONFIG_PARAVIRT_XXL instead of CONFIG_PARAVIRT Juergen Gross
2020-07-02  8:18 ` [PATCH v2 0/4] Remove 32-bit Xen PV guest support Peter Zijlstra
2020-07-02 14:48 ` Brian Gerst
2020-07-02 15:45   ` Jürgen Groß [this message]

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