From: "Jan Beulich" <JBeulich@suse.com>
To: Juergen Gross <jgross@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
linux-kernel@vger.kernel.org, mingo@redhat.com,
Borislav Petkov <bp@alien8.de>,
hpa@zytor.com, xen-devel <xen-devel@lists.xenproject.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
tglx@linutronix.de
Subject: Re: [PATCH] xen: fix dom0 boot on huge systems
Date: Thu, 07 Mar 2019 03:45:54 -0700 [thread overview]
Message-ID: <5C80F662020000780021C674__35515.562414524$1551955621$gmane$org@prv1-mh.provo.novell.com> (raw)
In-Reply-To: <20190307091119.6700-1-jgross@suse.com>
>>> On 07.03.19 at 10:11, <jgross@suse.com> wrote:
> Commit f7c90c2aa40048 ("x86/xen: don't write ptes directly in 32-bit
> PV guests") introduced a regression for booting dom0 on huge systems
> with lots of RAM (in the TB range).
>
> Reason is that on those hosts the p2m list needs to be moved early in
> the boot process and this requires temporary page tables to be created.
> Said commit modified xen_set_pte_init() to use a hypercall for writing
> a PTE, but this requires the page table being in the direct mapped
> area, which is not the case for the temporary page tables used in
> xen_relocate_p2m().
>
> As the page tables are completely written before being linked to the
> actual address space instead of set_pte() a plain write to memory can
> be used in xen_relocate_p2m().
>
> Fixes: f7c90c2aa40048 ("x86/xen: don't write ptes directly in 32-bit PV guests")
> Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
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next prev parent reply other threads:[~2019-03-07 10:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-07 9:11 [PATCH] xen: fix dom0 boot on huge systems Juergen Gross
2019-03-07 10:45 ` Jan Beulich [this message]
2019-03-07 10:45 ` [Xen-devel] " Jan Beulich
-- strict thread matches above, loose matches on Subject: below --
2019-03-07 9:11 Juergen Gross
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