Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Thu, 10 Aug 2023 08:48:31 -0700
From:   Nathan Chancellor <nathan@kernel.org>
To:     Borislav Petkov <bp@alien8.de>
Cc:     x86@kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: Hang when booting guest kernels compiled with clang after SRSO
 mitigations
Message-ID: <20230810154831.GA38495@dev-arch.thelio-3990X>
References: <20230810081038.GAZNSbftb6DOgg/U7e@fat_crate.local>
 <20230810090835.GBZNSpE6tCw+Ci+9yh@fat_crate.local>
 <20230810101649.GA1795474@dev-arch.thelio-3990X>
 <20230810125122.GIZNTdSuFvA3Cjfexq@fat_crate.local>
 <20230810132706.GA3805855@dev-arch.thelio-3990X>
 <20230810133216.GKZNTm4KpohRR4gVsT@fat_crate.local>
 <20230810134056.GA130730@dev-arch.thelio-3990X>
 <20230810144344.GLZNT3oM6MLVdzGlyd@fat_crate.local>
 <20230810150706.GA42856@dev-arch.thelio-3990X>
 <20230810151410.GNZNT+wn/cLBWiU6dO@fat_crate.local>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230810151410.GNZNT+wn/cLBWiU6dO@fat_crate.local>
Precedence: bulk

On Thu, Aug 10, 2023 at 05:14:10PM +0200, Borislav Petkov wrote:
> On Thu, Aug 10, 2023 at 08:07:06AM -0700, Nathan Chancellor wrote:
> >   [    2.408527] microcode: microcode updated early to new patch_level=0x0830107a
> 
> Hm, a wild guess: can you boot the *host* with "dis_ucode_ldr" on the
> kernel cmdline and see if it still reproduces?

It does.

> Also, can you bisect rc5..master to see which exact patch is causing
> this?

Sure thing. I at least isolated it to the SRSO merge, so I will just
bisect that to see the exact commit that causes this.

Cheers,
Nathan