linux-kernel - Re: Xen PV dom0 "tried to execute NX-protected page" when running nested in KVM

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Message-ID: <2c24aca9-5e67-4c0f-b890-92a0ad8e1975@citrix.com>
Date: Thu, 19 Jun 2025 12:31:22 +0100
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: Marek Marczykowski-Górecki
 <marmarek@...isiblethingslab.com>, Dave Hansen
 <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>
Cc: xen-devel <xen-devel@...ts.xenproject.org>, linux-kernel@...r.kernel.org
Subject: Re: Xen PV dom0 "tried to execute NX-protected page" when running
 nested in KVM - 6.15 regression

On 19/06/2025 12:24 pm, Marek Marczykowski-Górecki wrote:
> Hi,
>
> With Linux 6.15.2 I got a crash like below. It worked fine with Linux
> 6.14.11. Furthermore, the failure seems to be hardware-dependent. It
> happens when running on Intel Core i9-13900H, but does not happen when
> running on Intel Xeon E5-2620v4 (in both cases QEMU uses -cpu host).

Yes, it's a known regression in Linux's ITS / CVE-2024-28956 patches.

https://lore.kernel.org/lkml/20250603111446.2609381-1-rppt@kernel.org/

It's hardware-dependent because so is Indirect Target Selection.

~Andrew