Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 16 Jun 2023 09:33:07 -0000
From:   "tip-bot2 for Juergen Gross" <tip-bot2@linutronix.de>
Sender: tip-bot2@linutronix.de
Reply-to: linux-kernel@vger.kernel.org
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
In-Reply-To: <20230615123959.12298-1-jgross@suse.com>
References: <20230615123959.12298-1-jgross@suse.com>
MIME-Version: 1.0
Message-ID: <168690798706.404.5612585523577062985.tip-bot2@tip-bot2>
Robot-ID: <tip-bot2@linutronix.de>
Robot-Unsubscribe: Contact <mailto:tglx@linutronix.de> to get blacklisted from these emails
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Precedence: bulk

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)