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authorJuergen Gross <[email protected]>2023-06-15 14:39:59 +0200
committerBorislav Petkov (AMD) <[email protected]>2023-06-16 11:22:33 +0200
commit30d65d1b19850c9bc8c17dba8ebe9be5e0c17054 (patch)
treea407091cb50a0038b232a88e7867313ab51ec5e8
parent7c1dee734f3b8003429c40fb9186401485670dfd (diff)
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 <[email protected]> Signed-off-by: Borislav Petkov (AMD) <[email protected]> Reviewed-by: Boris Ostrovsky <[email protected]> Link: https://lore.kernel.org/r/[email protected]
-rw-r--r--arch/x86/xen/enlighten_pv.c2
1 files changed, 2 insertions, 0 deletions
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)