From: "Nikunj A. Dadhania" <nikunj@amd.com>
To: Dave Hansen <dave.hansen@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Borislav Petkov <bp@alien8.de>
Cc: <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
<tglx@kernel.org>, <mingo@redhat.com>,
<dave.hansen@linux.intel.com>, <hpa@zytor.com>, <xin@zytor.com>,
<seanjc@google.com>, <pbonzini@redhat.com>, <x86@kernel.org>,
<sohil.mehta@intel.com>, <jon.grimm@amd.com>
Subject: Re: [PATCH v2 1/2] x86/cpu: Disable CR pinning during CPU bringup
Date: Thu, 12 Mar 2026 20:23:19 +0530 [thread overview]
Message-ID: <a078ceb4-6e31-4e8a-89d8-023b95f56054@amd.com> (raw)
In-Reply-To: <ab5bf7bb-6511-49dc-a65d-86911e0f7091@intel.com>
On 3/12/2026 7:50 PM, Dave Hansen wrote:
> On 3/12/26 07:08, Nikunj A. Dadhania wrote:
>> 1) Back-porting complexity: The current issue affects kernels (6.9+)
>> where SEV-SNP guests fail to boot with FRED enabled. A simpler fix would
>> be easier to backport and verify across stable branches.
>
> The simplest fix is to disable FRED on those kernels, fwiw.
That would work, but disabling FRED means LTS users will not be able to use
FRED with confidential computing—that's not really a fix.
This isn't just SEV-SNP. Xin Li confirmed Intel TDX has the same issue: FRED
is enabled before exception handling is ready, and #VC/#VE can't be handled on
secondary CPUs.
The initialization order is wrong for both SEV-SNP and TDX. The fixes are small
and targeted—just ensuring FRED state is set up before it's needed.
Regards,
Nikunj
next prev parent reply other threads:[~2026-03-12 14:53 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-26 9:23 [PATCH v2 0/2] x86/fred: Fix SEV-ES/SNP guest boot failures Nikunj A Dadhania
2026-02-26 9:23 ` [PATCH v2 1/2] x86/cpu: Disable CR pinning during CPU bringup Nikunj A Dadhania
2026-03-09 13:46 ` Borislav Petkov
2026-03-09 15:38 ` Dave Hansen
2026-03-09 16:15 ` Borislav Petkov
2026-03-09 18:03 ` Dave Hansen
2026-03-09 18:40 ` Tom Lendacky
2026-03-09 19:27 ` Dave Hansen
2026-03-11 10:41 ` Nikunj A. Dadhania
2026-03-11 14:07 ` Dave Hansen
2026-03-11 15:42 ` Nikunj A. Dadhania
2026-03-11 17:28 ` Dave Hansen
2026-03-12 7:21 ` Nikunj A. Dadhania
2026-03-12 7:26 ` Nikunj A. Dadhania
2026-03-12 14:08 ` Nikunj A. Dadhania
2026-03-12 14:20 ` Dave Hansen
2026-03-12 14:53 ` Nikunj A. Dadhania [this message]
2026-03-12 15:02 ` Dave Hansen
2026-03-12 19:06 ` David Laight
2026-03-16 20:27 ` Chang S. Bae
2026-03-16 21:43 ` Dave Hansen
2026-03-17 4:12 ` Nikunj A. Dadhania
2026-03-17 14:26 ` Borislav Petkov
2026-03-17 15:31 ` Dave Hansen
2026-03-17 16:54 ` Borislav Petkov
2026-03-18 8:19 ` Nikunj A. Dadhania
2026-03-17 17:04 ` Chang S. Bae
2026-03-17 17:51 ` Chang S. Bae
2026-03-12 18:09 ` Sohil Mehta
2026-03-13 8:35 ` Nikunj A. Dadhania
2026-03-13 18:05 ` Sohil Mehta
2026-03-13 19:10 ` Borislav Petkov
2026-03-17 17:06 ` Chang S. Bae
2026-02-26 9:23 ` [PATCH v2 2/2] x86/fred: Fix early boot failures on SEV-ES/SNP guests Nikunj A Dadhania
2026-02-26 14:14 ` Tom Lendacky
2026-02-27 4:14 ` Nikunj A. Dadhania
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