linux-kernel - Re: [RFC PATCH] x86/virt/tdx: Disable KEXEC in the presence of TDX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <7695034c0c7bf91532fb5cbd05d9a4b8cb77e70f.camel@intel.com>
Date: Fri, 19 Jan 2024 00:52:29 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"nik.borisov@...e.com" <nik.borisov@...e.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
	"x86@...nel.org" <x86@...nel.org>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>
Subject: Re: [RFC PATCH] x86/virt/tdx: Disable KEXEC in the presence of TDX

On Fri, 2024-01-19 at 02:49 +0200, Nikolay Borisov wrote:
> [Adding Kirill as he has a series in flight about KEXEC]
> 
> On 18.01.24 г. 23:31 ч., Huang, Kai wrote:
> > On Thu, 2024-01-18 at 18:01 +0200, Nikolay Borisov wrote:
> > > TDX doesn't currently support kexec so disable the latter when TDX
> > > is detected at boot time. If kexec must absolutely be supported then
> > > TDX can be disabled from the bios.
> > > 
> > > Making this decision at run time rather than as a compile time option
> > > allows distribution kernels to have both enabled and delegate to the
> > > user whether they want to use TDX/Kexec.
> > > 
> > > Signed-off-by: Nikolay Borisov <nik.borisov@...e.com>
> > 
> > Hi Nikolay,
> > 
> > Thanks for the patch.
> > 
> > I am working in progress on patches to make kexec() work with TDX.  I plan to
> > send them out soon (e.g., next week), but I think perhaps your patch is
> > reasonable before that is merged.
> 
> I thought Kirill's series rectifies this ?
> 

No that's for TDX guest.