From: Usama Arif <usamaarif642@gmail.com>
To: dwmw@amazon.co.uk, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, dave.hansen@linux.intel.com, ardb@kernel.org,
hpa@zytor.com
Cc: x86@kernel.org, apopple@nvidia.com, thuth@redhat.com,
nik.borisov@suse.com, kas@kernel.org,
linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
kernel-team@meta.com,
Michael van der Westhuizen <rmikey@meta.com>,
Tobias Fleig <tfleig@meta.com>
Subject: Re: [PATCH 0/3] x86: Fix kexec 5-level to 4-level paging transition
Date: Wed, 22 Oct 2025 23:25:39 +0100 [thread overview]
Message-ID: <b202b140-b669-4260-891d-aa451521664a@gmail.com> (raw)
In-Reply-To: <20251022220755.1026144-1-usamaarif642@gmail.com>
On 22/10/2025 23:06, Usama Arif wrote:
> This series addresses critical bugs in the kexec path when transitioning
> from a kernel using 5-level page tables to one using 4-level page tables.
>
> The root cause is improper handling of PGD entry value during the page level
> transition. Specifically p4d value is masked with PAGE_MASK instead of
> PTE_PFN_MASK, failing to account for high-order software bits like
> _PAGE_BIT_NOPTISHADOW (bit 58).
s/p4d value/PGD entry value/ for consistency.
prev parent reply other threads:[~2025-10-22 22:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-22 22:06 [PATCH 0/3] x86: Fix kexec 5-level to 4-level paging transition Usama Arif
2025-10-22 22:06 ` [PATCH 1/3] x86/boot: Fix page table access in " Usama Arif
2025-10-22 23:16 ` Dave Hansen
2025-10-22 23:49 ` Usama Arif
2025-10-25 21:50 ` H. Peter Anvin
2025-10-23 17:43 ` kernel test robot
2025-10-24 8:07 ` kernel test robot
2025-10-22 22:06 ` [PATCH 2/3] efi/libstub: " Usama Arif
2025-10-23 14:13 ` Ard Biesheuvel
2025-10-23 14:28 ` Kiryl Shutsemau
2025-10-22 22:06 ` [PATCH 3/3] x86/mm: Move _PAGE_BIT_NOPTISHADOW from bit 58 to bit 9 Usama Arif
2025-10-22 23:35 ` Dave Hansen
2025-10-22 23:58 ` Usama Arif
2025-10-23 14:05 ` Dave Hansen
2025-10-23 14:24 ` Kiryl Shutsemau
2025-10-23 15:12 ` Dave Hansen
2025-10-23 15:25 ` Kiryl Shutsemau
2025-10-23 22:15 ` Usama Arif
2025-10-22 22:25 ` Usama Arif [this message]
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