Patch "x86/xen: Add call of speculative_store_bypass_ht_init() to PV paths" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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 4.4-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-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From 9dee2b7c4d4868423d9812c969b0b724fdf780c6 Mon Sep 17 00:00:00 2001
From: Juergen Gross <jgross@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 <jgross@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.woods@amd.com>
Tested-by: Brian Woods <brian.woods@amd.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Cc: <stable@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: boris.ostrovsky@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-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@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);
@@ -357,6 +360,8 @@ 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 jgross@suse.com are

queue-4.4/x86-xen-add-call-of-speculative_store_bypass_ht_init-to-pv-paths.patch
queue-4.4/xen-set-cpu-capabilities-from-xen_start_kernel.patch
queue-4.4/x86-xen-zero-msr_ia32_spec_ctrl-before-suspend.patch
queue-4.4/x86-paravirt-make-native_save_fl-extern-inline.patch
queue-4.4/x86-amd-don-t-set-x86_bug_sysret_ss_attrs-when-running-under-xen.patch

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