This is a note to let you know that I've just added the patch titled
x86/xen: Add call of speculative_store_bypass_ht_init() to PV paths
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-xen-add-call-of-speculative_store_bypass_ht_init-to-pv-paths.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@vger.kernel.org> know about it.
From 74899d92e66663dc7671a8017b3146dcd4735f3b Mon Sep 17 00:00:00 2001
From: Juergen Gross <jgr...@suse.com>
Date: Thu, 21 Jun 2018 10:43:31 +0200
Subject: x86/xen: Add call of speculative_store_bypass_ht_init() to PV paths
From: Juergen Gross <jgr...@suse.com>
commit 74899d92e66663dc7671a8017b3146dcd4735f3b upstream.
Commit:
1f50ddb4f418 ("x86/speculation: Handle HT correctly on AMD")
... added speculative_store_bypass_ht_init() to the per-CPU initialization
sequence.
speculative_store_bypass_ht_init() needs to be called on each CPU for
PV guests, too.
Reported-by: Brian Woods <brian.wo...@amd.com>
Tested-by: Brian Woods <brian.wo...@amd.com>
Signed-off-by: Juergen Gross <jgr...@suse.com>
Cc: <sta...@vger.kernel.org>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: boris.ostrov...@oracle.com
Cc: xen-devel@lists.xenproject.org
Fixes: 1f50ddb4f4189243c05926b842dc1a0332195f31 ("x86/speculation: Handle HT
correctly on AMD")
Link: https://lore.kernel.org/lkml/20180621084331.21228-1-jgr...@suse.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/xen/smp.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -28,6 +28,7 @@
#include <xen/interface/vcpu.h>
#include <xen/interface/xenpmu.h>
+#include <asm/spec-ctrl.h>
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>
@@ -87,6 +88,8 @@ static void cpu_bringup(void)
cpu_data(cpu).x86_max_cores = 1;
set_cpu_sibling_map(cpu);
+ speculative_store_bypass_ht_init();
+
xen_setup_cpu_clockevents();
notify_cpu_starting(cpu);
@@ -375,6 +378,8 @@ static void __init xen_smp_prepare_cpus(
}
set_cpu_sibling_map(0);
+ speculative_store_bypass_ht_init();
+
xen_pmu_init(0);
if (xen_smp_intr_init(0))
Patches currently in stable-queue which might be from jgr...@suse.com are
queue-4.9/x86-xen-add-call-of-speculative_store_bypass_ht_init-to-pv-paths.patch
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