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authorLinus Torvalds <torvalds@linux-foundation.org>2019-02-03 20:02:03 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-02-03 20:02:03 +0300
commitcc6810e36bd875f197fcd6c74ad01f48090ecc05 (patch)
tree3f0624fb3fef50dca9d71334d72543fd5c2e0643 /arch
parent58f6d4287af751a75b24f4d32e6e1b077146ab18 (diff)
parentb284909abad48b07d3071a9fc9b5692b3e64914b (diff)
downloadlinux-cc6810e36bd875f197fcd6c74ad01f48090ecc05.tar.xz
Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull cpu hotplug fixes from Thomas Gleixner: "Two fixes for the cpu hotplug machinery: - Replace the overly clever 'SMT disabled by BIOS' detection logic as it breaks KVM scenarios and prevents speculation control updates when the Hyperthreads are brought online late after boot. - Remove a redundant invocation of the speculation control update function" * 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM x86/speculation: Remove redundant arch_smt_update() invocation
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/bugs.c2
-rw-r--r--arch/x86/kvm/vmx/vmx.c3
2 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 1de0f4170178..01874d54f4fd 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -71,7 +71,7 @@ void __init check_bugs(void)
* identify_boot_cpu() initialized SMT support information, let the
* core code know.
*/
- cpu_smt_check_topology_early();
+ cpu_smt_check_topology();
if (!IS_ENABLED(CONFIG_SMP)) {
pr_info("CPU: ");
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 4341175339f3..95d618045001 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -26,6 +26,7 @@
#include <linux/mod_devicetable.h>
#include <linux/mm.h>
#include <linux/sched.h>
+#include <linux/sched/smt.h>
#include <linux/slab.h>
#include <linux/tboot.h>
#include <linux/trace_events.h>
@@ -6823,7 +6824,7 @@ static int vmx_vm_init(struct kvm *kvm)
* Warn upon starting the first VM in a potentially
* insecure environment.
*/
- if (cpu_smt_control == CPU_SMT_ENABLED)
+ if (sched_smt_active())
pr_warn_once(L1TF_MSG_SMT);
if (l1tf_vmx_mitigation == VMENTER_L1D_FLUSH_NEVER)
pr_warn_once(L1TF_MSG_L1D);