Message ID | 20200917140457.1950760-2-marcelo.cerri@canonical.com |
---|---|
State | New |
Headers | show |
Series | LP:#1895980 - Unexpected warning when hibernating | expand |
On Thu, Sep 17, 2020 at 11:04:57AM -0300, Marcelo Henrique Cerri wrote: > From: Vitaly Kuznetsov <vkuznets@redhat.com> > > BugLink: https://bugs.launchpad.net/bugs/1895980 > > Errors during hibernation with reenlightenment notifications enabled were > reported: > > [ 51.730435] PM: hibernation entry > [ 51.737435] PM: Syncing filesystems ... > ... > [ 54.102216] Disabling non-boot CPUs ... > [ 54.106633] smpboot: CPU 1 is now offline > [ 54.110006] unchecked MSR access error: WRMSR to 0x40000106 (tried to > write 0x47c72780000100ee) at rIP: 0xffffffff90062f24 > native_write_msr+0x4/0x20) > [ 54.110006] Call Trace: > [ 54.110006] hv_cpu_die+0xd9/0xf0 > ... > > Normally, hv_cpu_die() just reassigns reenlightenment notifications to some > other CPU when the CPU receiving them goes offline. Upon hibernation, there > is no other CPU which is still online so cpumask_any_but(cpu_online_mask) > returns >= nr_cpu_ids and using it as hv_vp_index index is incorrect. > Disable the feature when cpumask_any_but() fails. > > Also, as we now disable reenlightenment notifications upon hibernation we > need to restore them on resume. Check if hv_reenlightenment_cb was > previously set and restore from hv_resume(). > > Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> > Reviewed-by: Dexuan Cui <decui@microsoft.com> > Reviewed-by: Tianyu Lan <Tianyu.Lan@microsoft.com> > Link: https://lore.kernel.org/r/20200512160153.134467-1-vkuznets@redhat.com > Signed-off-by: Wei Liu <wei.liu@kernel.org> > (cherry picked from commit 38dce4195f0daefb566279fd9fd51e1fbd62ae1b) > Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com> > --- > arch/x86/hyperv/hv_init.c | 19 +++++++++++++++++-- > 1 file changed, 17 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c > index c14469fe93d2..1412e59eda01 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. */ > -- > 2.25.1 Just a little concerned on testing for the second part of the commit, but as it's restricted to the resume path and this is mentioned as work in progress, please apply. Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
LGTM Acked-by: Ian May <ian.may@canonical.com> On 2020-09-17 11:04:57 , Marcelo Henrique Cerri wrote: > From: Vitaly Kuznetsov <vkuznets@redhat.com> > > BugLink: https://bugs.launchpad.net/bugs/1895980 > > Errors during hibernation with reenlightenment notifications enabled were > reported: > > [ 51.730435] PM: hibernation entry > [ 51.737435] PM: Syncing filesystems ... > ... > [ 54.102216] Disabling non-boot CPUs ... > [ 54.106633] smpboot: CPU 1 is now offline > [ 54.110006] unchecked MSR access error: WRMSR to 0x40000106 (tried to > write 0x47c72780000100ee) at rIP: 0xffffffff90062f24 > native_write_msr+0x4/0x20) > [ 54.110006] Call Trace: > [ 54.110006] hv_cpu_die+0xd9/0xf0 > ... > > Normally, hv_cpu_die() just reassigns reenlightenment notifications to some > other CPU when the CPU receiving them goes offline. Upon hibernation, there > is no other CPU which is still online so cpumask_any_but(cpu_online_mask) > returns >= nr_cpu_ids and using it as hv_vp_index index is incorrect. > Disable the feature when cpumask_any_but() fails. > > Also, as we now disable reenlightenment notifications upon hibernation we > need to restore them on resume. Check if hv_reenlightenment_cb was > previously set and restore from hv_resume(). > > Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> > Reviewed-by: Dexuan Cui <decui@microsoft.com> > Reviewed-by: Tianyu Lan <Tianyu.Lan@microsoft.com> > Link: https://lore.kernel.org/r/20200512160153.134467-1-vkuznets@redhat.com > Signed-off-by: Wei Liu <wei.liu@kernel.org> > (cherry picked from commit 38dce4195f0daefb566279fd9fd51e1fbd62ae1b) > Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com> > --- > arch/x86/hyperv/hv_init.c | 19 +++++++++++++++++-- > 1 file changed, 17 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c > index c14469fe93d2..1412e59eda01 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. */ > -- > 2.25.1 > > > -- > kernel-team mailing list > kernel-team@lists.ubuntu.com > https://lists.ubuntu.com/mailman/listinfo/kernel-team
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index c14469fe93d2..1412e59eda01 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. */