From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Michael Kelley <mikelley@microsoft.com>,
"ltykernel\@gmail.com" <ltykernel@gmail.com>
Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>,
"linux-hyperv\@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>,
KY Srinivasan <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <liuwe@microsoft.com>,
"tglx\@linutronix.de" <tglx@linutronix.de>,
"mingo\@redhat.com" <mingo@redhat.com>,
"bp\@alien8.de" <bp@alien8.de>, "hpa\@zytor.com" <hpa@zytor.com>,
"x86\@kernel.org" <x86@kernel.org>
Subject: RE: [PATCH 0/4] x86/Hyper-V: Unload vmbus channel in hv panic callback
Date: Thu, 19 Mar 2020 09:03:57 +0100 [thread overview]
Message-ID: <87mu8c22ky.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <MW2PR2101MB10529A60AF5185BBD7B02E04D7F40@MW2PR2101MB1052.namprd21.prod.outlook.com>
Michael Kelley <mikelley@microsoft.com> writes:
>> > --- a/drivers/hv/vmbus_drv.c
>> > +++ b/drivers/hv/vmbus_drv.c
>> > @@ -53,9 +53,12 @@ static int hyperv_panic_event(struct notifier_block *nb, unsigned
>> long val,
>> > {
>> > struct pt_regs *regs;
>> >
>> > - regs = current_pt_regs();
>> > + vmbus_initiate_unload(true);
>> >
>> > - hyperv_report_panic(regs, val);
>> > + if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
>>
>> With Michael's effors to make code in drivers/hv arch agnostic, I think
>> we need a better, arch-neutral way.
>
> Vitaly -- could you elaborate on what part is not arch-neutral? I don't see
> a problem. ms_hyperv and the misc_features field exist for both the x86
> and ARM64 code branches. It turns out the particular bit for
> GUEST_CRASH_MSR_AVAILABLE is different on the two architectures, but
> the compiler will do the right thing.
>
Ah, apologies, missed the fact that we also call it
'HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE' - I have to admit I was confused
by the 'MSR' part. We can probably rename this to something like
HV_FEATURE_GUEST_CRASH_REGS_AVAILABLE - but not as part of the series.
--
Vitaly
next prev parent reply other threads:[~2020-03-19 8:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-17 13:25 [PATCH 0/4] x86/Hyper-V: Panic code path fixes ltykernel
2020-03-17 13:25 ` [PATCH 0/4] x86/Hyper-V: Unload vmbus channel in hv panic callback ltykernel
2020-03-17 17:35 ` Wei Liu
2020-03-19 8:24 ` Tianyu Lan
2020-03-18 15:58 ` Vitaly Kuznetsov
2020-03-19 0:33 ` Michael Kelley
2020-03-19 8:03 ` Vitaly Kuznetsov [this message]
2020-03-19 15:06 ` Michael Kelley
2020-03-19 8:03 ` Tianyu Lan
2020-03-17 13:25 ` [PATCH 2/4] x86/Hyper-V: Free hv_panic_page when fail to register kmsg dump ltykernel
2020-03-17 17:36 ` Wei Liu
2020-03-19 8:12 ` Tianyu Lan
2020-03-19 0:38 ` Michael Kelley
2020-03-17 13:25 ` [PATCH 3/4] x86/Hyper-V: Trigger crash enlightenment only once during system crash ltykernel
2020-03-19 0:45 ` Michael Kelley
2020-03-17 13:25 ` [PATCH 4/4] x86/Hyper-V: Report crash register data or ksmg before running crash kernel ltykernel
2020-03-19 0:51 ` Michael Kelley
2020-03-19 0:57 ` [PATCH 0/4] x86/Hyper-V: Panic code path fixes Michael Kelley
2020-03-19 14:08 ` Tianyu Lan
2020-03-19 15:14 ` Michael Kelley
2020-03-19 16:07 ` Michael Kelley
2020-03-20 2:21 ` Tianyu Lan
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