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From: Jan Beulich <jbeulich@suse.com>
To: "George Dunlap" <george.dunlap@citrix.com>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Cc: xen-devel@lists.xenproject.org, Jann Horn <jannh@google.com>
Subject: Re: [PATCH v2] SUPPORT.md: Un-shimmed 32-bit PV guests are no longer supported
Date: Thu, 6 May 2021 15:09:35 +0200	[thread overview]
Message-ID: <acd695c1-dc04-4606-5212-5fd993e355b1@suse.com> (raw)
In-Reply-To: <20210506124752.65844-1-george.dunlap@citrix.com>

On 06.05.2021 14:47, George Dunlap wrote:
> --- a/xen/arch/x86/Kconfig
> +++ b/xen/arch/x86/Kconfig
> @@ -55,7 +55,7 @@ config PV
>  config PV32
>  	bool "Support for 32bit PV guests"
>  	depends on PV
> -	default y
> +	default PV_SHIM
>  	select COMPAT
>  	---help---
>  	  The 32bit PV ABI uses Ring1, an area of the x86 architecture which
> @@ -67,7 +67,10 @@ config PV32
>  	  reduction, or performance reasons.  Backwards compatibility can be
>  	  provided via the PV Shim mechanism.
>  
> -	  If unsure, say Y.
> +	  Note that outside of PV Shim, 32-bit PV guests are not security
> +	  supported anymore.
> +
> +	  If unsure, use the default setting.

Alongside this I wonder whether we should also default opt_pv32 to false
then, unless running in shim mode.

Jan


  reply	other threads:[~2021-05-06 13:09 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-06 12:47 George Dunlap
2021-05-06 13:09 ` Jan Beulich [this message]
2021-05-06 14:32   ` Andrew Cooper
2021-05-07 10:26 ` Roger Pau Monné
2021-05-07 11:05   ` Jan Beulich
2021-06-04 13:14 ` George Dunlap
2021-06-07  9:18 ` Jan Beulich

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