From: Juergen Gross <jgross@suse.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org
Cc: Juergen Gross <jgross@suse.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
xen-devel@lists.xenproject.org
Subject: [PATCH] x86/xen: set default memory type for pv guests to WB
Date: Thu, 15 Jun 2023 14:39:59 +0200 [thread overview]
Message-ID: <20230615123959.12298-1-jgross@suse.com> (raw)
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>
---
Based on tip x86/mtrr branch
---
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 8732b85d5650..93b658248d01 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)
--
2.35.3
next reply other threads:[~2023-06-15 12:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-15 12:39 Juergen Gross [this message]
2023-06-15 19:37 ` Boris Ostrovsky
2023-06-16 9:33 ` [tip: x86/mtrr] x86/xen: Set default memory type for PV " tip-bot2 for Juergen Gross
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