linux-kernel - [PATCH 3.16 050/131] x86/xen: Add call of speculative_store_bypass_ht

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Message-ID: <lsq.1538257387.813871123@decadent.org.uk>
Date:   Sat, 29 Sep 2018 22:43:07 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, xen-devel@...ts.xenproject.org,
        "Juergen Gross" <jgross@...e.com>,
        "Brian Woods" <brian.woods@....com>,
        "Thomas Gleixner" <tglx@...utronix.de>, boris.ostrovsky@...cle.com,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Ingo Molnar" <mingo@...nel.org>
Subject: [PATCH 3.16 050/131] x86/xen: Add call of speculative_store_bypass_ht_init()
 to PV paths

3.16.59-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Juergen Gross <jgross@...e.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@....com>
Tested-by: Brian Woods <brian.woods@....com>
Signed-off-by: Juergen Gross <jgross@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: boris.ostrovsky@...cle.com
Cc: xen-devel@...ts.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@...nel.org>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/xen/smp_pv.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -27,6 +27,7 @@
 #include <xen/interface/xen.h>
 #include <xen/interface/vcpu.h>
 
+#include <asm/spec-ctrl.h>
 #include <asm/xen/interface.h>
 #include <asm/xen/hypercall.h>
 
@@ -83,6 +84,8 @@ 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);
@@ -334,6 +337,8 @@ static void __init xen_smp_prepare_cpus(
 	}
 	set_cpu_sibling_map(0);
 
+	speculative_store_bypass_ht_init();
+
 	if (xen_smp_intr_init(0))
 		BUG();