linux-kernel - Re: [PATCH RFC 2/4] xen/pvhvm: Introduce xen_pvhvm_kexec

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Message-ID: <87r41mty9q.fsf@vitty.brq.redhat.com>
Date:	Tue, 15 Jul 2014 17:52:33 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	xen-devel@...ts.xenproject.org,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Andrew Jones <drjones@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/4] xen/pvhvm: Introduce xen_pvhvm_kexec_shutdown()

Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> writes:

> On Tue, Jul 15, 2014 at 03:40:38PM +0200, Vitaly Kuznetsov wrote:
>> PVHVM guest requires special actions before kexec. Register specific
>> xen_pvhvm_kexec_shutdown() handler for machine_ops.shutdown().
>> 
>
> This looks close to what I had sent as an RFC to you?
>

Yes, I stole that part from your "RFC: VCPU_reset_cpu_info" patch to
call xen_unmap_all_pirqs() on shutdown. I'm looking at SMP issues your
patches address as well.

>> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
>> ---
>>  arch/x86/xen/enlighten.c | 9 +++++++++
>>  arch/x86/xen/smp.c       | 9 +++++++++
>>  arch/x86/xen/smp.h       | 1 +
>>  3 files changed, 19 insertions(+)
>> 
>> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
>> index a11af62..8074e4a 100644
>> --- a/arch/x86/xen/enlighten.c
>> +++ b/arch/x86/xen/enlighten.c
>> @@ -1833,6 +1833,12 @@ static struct notifier_block xen_hvm_cpu_notifier = {
>>  	.notifier_call	= xen_hvm_cpu_notify,
>>  };
>>  
>> +static void xen_pvhvm_kexec_shutdown(void)
>> +{
>> +	xen_kexec_shutdown();
>> +	native_machine_shutdown();
>> +}
>> +
>>  static void __init xen_hvm_guest_init(void)
>>  {
>>  	init_hvm_pv_info();
>> @@ -1849,6 +1855,9 @@ static void __init xen_hvm_guest_init(void)
>>  	x86_init.irqs.intr_init = xen_init_IRQ;
>>  	xen_hvm_init_time_ops();
>>  	xen_hvm_init_mmu_ops();
>> +#ifdef CONFIG_KEXEC
>> +	machine_ops.shutdown = xen_pvhvm_kexec_shutdown;
>> +#endif
>>  }
>>  
>>  static uint32_t __init xen_hvm_platform(void)
>> diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
>> index 7005974..35dcf39 100644
>> --- a/arch/x86/xen/smp.c
>> +++ b/arch/x86/xen/smp.c
>> @@ -18,6 +18,7 @@
>>  #include <linux/smp.h>
>>  #include <linux/irq_work.h>
>>  #include <linux/tick.h>
>> +#include <linux/kexec.h>
>>  
>>  #include <asm/paravirt.h>
>>  #include <asm/desc.h>
>> @@ -762,6 +763,14 @@ static void xen_hvm_cpu_die(unsigned int cpu)
>>  	native_cpu_die(cpu);
>>  }
>>  
>> +void xen_kexec_shutdown(void)
>> +{
>> +#ifdef CONFIG_KEXEC
>> +	if (!kexec_in_progress)
>> +		return;
>> +#endif
>> +}
>> +
>>  void __init xen_hvm_smp_init(void)
>>  {
>>  	if (!xen_have_vector_callback)
>> diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
>> index c7c2d89..1af0493 100644
>> --- a/arch/x86/xen/smp.h
>> +++ b/arch/x86/xen/smp.h
>> @@ -8,4 +8,5 @@ extern void xen_send_IPI_allbutself(int vector);
>>  extern void xen_send_IPI_all(int vector);
>>  extern void xen_send_IPI_self(int vector);
>>  
>> +extern void xen_kexec_shutdown(void);
>>  #endif
>> -- 
>> 1.9.3
>> 

-- 
  Vitaly
--
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