linux-kernel - Re: [PATCH 5/7] x86/cpu: Enable LASS (Linear Address Space Separation)

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Message-ID: <2f24d157-8e8d-b632-0dc5-e082cf4ba8f4@intel.com>
Date:   Fri, 13 Jan 2023 11:39:48 -0800
From:   Sohil Mehta <sohil.mehta@...el.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Yian Chen <yian.chen@...el.com>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ravi Shankar <ravi.v.shankar@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Paul Lai <paul.c.lai@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Florian Weimer <fweimer@...hat.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 5/7] x86/cpu: Enable LASS (Linear Address Space
 Separation)

Adding folks from the previous discussion when a similar suggestion was
made by Kees. There didn't seem to be any major objection that time.

https://lore.kernel.org/lkml/202205111424.DEB0E3418@keescook/

On 1/12/2023 5:17 PM, Sohil Mehta wrote:
> We can make CONFIG_LEGACY_VSYSCALL_NONE as the default instead of the
> current CONFIG_LEGACY_VSYSCALL_XONLY. The kernel can disable LASS at
> boot time if a user/admin has shown explicit preference by selecting
> CONFIG_LEGACY_VSYSCALL_XONLY or by providing command line parameter
> vsyscall=xonly/emulate.
> 
> Thoughts?