* [PATCH] x86/xen: set default memory type for pv guests to WB
@ 2023-06-15 12:39 Juergen Gross
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
0 siblings, 2 replies; 3+ messages in thread
From: Juergen Gross @ 2023-06-15 12:39 UTC (permalink / raw)
To: linux-kernel, x86
Cc: Juergen Gross, Boris Ostrovsky, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, Dave Hansen, H. Peter Anvin, xen-devel
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] x86/xen: set default memory type for pv guests to WB
2023-06-15 12:39 [PATCH] x86/xen: set default memory type for pv guests to WB Juergen Gross
@ 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
1 sibling, 0 replies; 3+ messages in thread
From: Boris Ostrovsky @ 2023-06-15 19:37 UTC (permalink / raw)
To: Juergen Gross, linux-kernel, x86
Cc: Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen,
H. Peter Anvin, xen-devel
On 6/15/23 8:39 AM, Juergen Gross wrote:
> 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>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* [tip: x86/mtrr] x86/xen: Set default memory type for PV guests to WB
2023-06-15 12:39 [PATCH] x86/xen: set default memory type for pv guests to WB Juergen Gross
2023-06-15 19:37 ` Boris Ostrovsky
@ 2023-06-16 9:33 ` tip-bot2 for Juergen Gross
1 sibling, 0 replies; 3+ messages in thread
From: tip-bot2 for Juergen Gross @ 2023-06-16 9:33 UTC (permalink / raw)
To: linux-tip-commits
Cc: Juergen Gross, Borislav Petkov (AMD), Boris Ostrovsky, x86, linux-kernel
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)
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-06-16 9:34 UTC | newest]
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2023-06-15 12:39 [PATCH] x86/xen: set default memory type for pv guests to WB Juergen Gross
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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