linux-kernel - Re: [PATCH v6 4/6] kvm, mem-hotplug: Reload L1' apic access page on migration in vcpu_enter

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Date:	Wed, 17 Sep 2014 16:13:41 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Paolo Bonzini <pbonzini@...hat.com>, <gleb@...nel.org>,
	<mtosatti@...hat.com>, <nadav.amit@...il.com>, <jan.kiszka@....de>
CC:	<kvm@...r.kernel.org>, <laijs@...fujitsu.com>,
	<isimatu.yasuaki@...fujitsu.com>, <guz.fnst@...fujitsu.com>,
	<linux-kernel@...r.kernel.org>, <tangchen@...fujitsu.com>
Subject: Re: [PATCH v6 4/6] kvm, mem-hotplug: Reload L1' apic access page
 on migration in vcpu_enter_guest().


On 09/16/2014 07:24 PM, Paolo Bonzini wrote:
> Il 16/09/2014 12:42, Tang Chen ha scritto:
>> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
>> index 33712fb..0df82c1 100644
>> --- a/virt/kvm/kvm_main.c
>> +++ b/virt/kvm/kvm_main.c
>> @@ -210,6 +210,11 @@ void kvm_make_scan_ioapic_request(struct kvm *kvm)
>>   	make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
>>   }
>>   
>> +void kvm_reload_apic_access_page(struct kvm *kvm)
>> +{
>> +	make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD);
>> +}
>> +
>>   int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
>>   {
>>   	struct page *page;
>> @@ -294,6 +299,13 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
>>   	if (need_tlb_flush)
>>   		kvm_flush_remote_tlbs(kvm);
>>   
>> +	/*
>> +	 * The physical address of apic access page is stored in VMCS.
>> +	 * Update it when it becomes invalid.
>> +	 */
>> +	if (address == gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT))
>> +		kvm_reload_apic_access_page(kvm);
> This cannot be in the generic code.  It is architecture-specific.

Yes.

> Please add a new function kvm_arch_mmu_notifier_invalidate_page, and
> call it outside the mmu_lock.

Then I think we need a macro to control the calling of this arch function
since other architectures do not have it.

>
> kvm_reload_apic_access_page need not be in virt/kvm/kvm_main.c, either.

Since kvm_reload_apic_access_page() only calls make_all_cpus_request(),
and make_all_cpus_request() is static, I'd like to make it non-static, 
rename
it to kvm_make_all_cpus_request() and call it directly in 
kvm_arch_mmu_notifier_invalidate_page().
we don't need kvm_reload_apic_access_page() actually.

Thanks.

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