From: Joerg Roedel <joro@8bytes.org>
To: Mike Rapoport <rppt@kernel.org>
Cc: x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
hpa@zytor.com, jroedel@suse.de,
Andrew Morton <akpm@linux-foundation.org>,
Brijesh Singh <brijesh.singh@amd.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] x86/64/mm: Map all kernel memory into trampoline_pgd
Date: Wed, 15 Sep 2021 13:49:50 +0200 [thread overview]
Message-ID: <YUHd3kGUngaB758q@8bytes.org> (raw)
In-Reply-To: <YUBUx6KVwAp9b3b4@kernel.org>
Hi Mike,
On Tue, Sep 14, 2021 at 10:52:39AM +0300, Mike Rapoport wrote:
> On Mon, Sep 13, 2021 at 11:52:36AM +0200, Joerg Roedel wrote:
> > + for (i = pgd_index(__PAGE_OFFSET); i < PTRS_PER_PGD; i++)
> > + trampoline_pgd[i] = init_top_pgt[i].pgd;
>
> Don't we need to update the trampoline_pgd in sync_global_pgds() as well?
No, the trampoline_pgd is setup after preallocate_vmalloc_pages(), so
everything that would need synchronization is already in the reference
page-table.
Regards,
Joerg
prev parent reply other threads:[~2021-09-15 11:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-13 9:52 [PATCH] x86/64/mm: Map all kernel memory into trampoline_pgd Joerg Roedel
2021-09-14 7:52 ` Mike Rapoport
2021-09-15 11:49 ` Joerg Roedel [this message]
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