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To: linux-tip-commits@vger.kernel.org
Subject: [tip: x86/mtrr] x86/xen: Set default memory type for PV guests to WB
Cc: Juergen Gross <jgross@suse.com>,
"Borislav Petkov (AMD)" <bp@alien8.de>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>, x86@kernel.org,
linux-kernel@vger.kernel.org
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References: <20230615123959.12298-1-jgross@suse.com>
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[tip:,x86/mtrr] x86/xen: Set default memory type for PV guests to WB
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Commit Message
tip-bot2 for Thomas Gleixner
June 16, 2023, 9:33 a.m. UTC
The following commit has been merged into the x86/mtrr branch of tip: Commit-ID: 30d65d1b19850c9bc8c17dba8ebe9be5e0c17054 Gitweb: https://git.kernel.org/tip/30d65d1b19850c9bc8c17dba8ebe9be5e0c17054 Author: Juergen Gross <jgross@suse.com> AuthorDate: Thu, 15 Jun 2023 14:39:59 +02:00 Committer: Borislav Petkov (AMD) <bp@alien8.de> CommitterDate: Fri, 16 Jun 2023 11:22:33 +02:00 x86/xen: Set default memory type for PV guests to WB When running as an unprivileged PV guest under Xen (not dom0), the default MTRR memory type should be write-back. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/20230615123959.12298-1-jgross@suse.com --- arch/x86/xen/enlighten_pv.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 8732b85..93b6582 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -187,6 +187,8 @@ static void __init xen_pv_init_platform(void) if (xen_initial_domain()) xen_set_mtrr_data(); + else + mtrr_overwrite_state(NULL, 0, MTRR_TYPE_WRBACK); } static void __init xen_pv_guest_late_init(void)