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authorLinus Torvalds <torvalds@linux-foundation.org>2020-05-19 11:48:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-05-19 11:48:21 -0700
commit97076ea41a093e67db20d0e40f728a054b799630 (patch)
tree378736869d0764ad7966639ec340edc127c97bf7 /arch
parentc2b00cbda9f92820ddbe2ae8f97628dae84ccc37 (diff)
parent38dce4195f0daefb566279fd9fd51e1fbd62ae1b (diff)
downloadlinux-sh-97076ea41a093e67db20d0e40f728a054b799630.tar.gz
Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv fix from Wei Liu: "One patch from Vitaly to fix reenlightenment notifications" * tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: x86/hyperv: Properly suspend/resume reenlightenment notifications
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/hyperv/hv_init.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index fd51bac11b46..acf76b466db6 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -226,10 +226,18 @@ static int hv_cpu_die(unsigned int cpu)
rdmsrl(HV_X64_MSR_REENLIGHTENMENT_CONTROL, *((u64 *)&re_ctrl));
if (re_ctrl.target_vp == hv_vp_index[cpu]) {
- /* Reassign to some other online CPU */
+ /*
+ * Reassign reenlightenment notifications to some other online
+ * CPU or just disable the feature if there are no online CPUs
+ * left (happens on hibernation).
+ */
new_cpu = cpumask_any_but(cpu_online_mask, cpu);
- re_ctrl.target_vp = hv_vp_index[new_cpu];
+ if (new_cpu < nr_cpu_ids)
+ re_ctrl.target_vp = hv_vp_index[new_cpu];
+ else
+ re_ctrl.enabled = 0;
+
wrmsrl(HV_X64_MSR_REENLIGHTENMENT_CONTROL, *((u64 *)&re_ctrl));
}
@@ -293,6 +301,13 @@ static void hv_resume(void)
hv_hypercall_pg = hv_hypercall_pg_saved;
hv_hypercall_pg_saved = NULL;
+
+ /*
+ * Reenlightenment notifications are disabled by hv_cpu_die(0),
+ * reenable them here if hv_reenlightenment_cb was previously set.
+ */
+ if (hv_reenlightenment_cb)
+ set_hv_tscchange_cb(hv_reenlightenment_cb);
}
/* Note: when the ops are called, only CPU0 is online and IRQs are disabled. */