linux-kernel - Re: [PATCH RFC V9 19/19] kvm hypervisor: Add directed yield in vcpu block path

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Date:	Tue, 04 Jun 2013 12:58:46 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	gleb@...hat.com, mingo@...hat.com, jeremy@...p.org, x86@...nel.org,
	hpa@...or.com, pbonzini@...hat.com, linux-doc@...r.kernel.org,
	habanero@...ux.vnet.ibm.com, xen-devel@...ts.xensource.com,
	peterz@...radead.org, mtosatti@...hat.com,
	stefano.stabellini@...citrix.com, andi@...stfloor.org,
	attilio.rao@...rix.com, ouyang@...pitt.edu, gregkh@...e.de,
	agraf@...e.de, chegu_vinod@...com, torvalds@...ux-foundation.org,
	avi.kivity@...il.com, tglx@...utronix.de, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, riel@...hat.com, drjones@...hat.com,
	virtualization@...ts.linux-foundation.org,
	srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH RFC V9 19/19] kvm hypervisor: Add directed yield in vcpu
 block path

On 06/03/2013 09:35 PM, Konrad Rzeszutek Wilk wrote:
> On Sun, Jun 02, 2013 at 12:56:45AM +0530, Raghavendra K T wrote:
>> kvm hypervisor: Add directed yield in vcpu block path
>>
>> From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
>>
>> We use the improved PLE handler logic in vcpu block patch for
>> scheduling rather than plain schedule, so that we can make
>> intelligent decisions
>
> You are missing '.' there, and
>

Yep.

>>
>> Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
>> ---
>>   arch/ia64/include/asm/kvm_host.h    |    5 +++++
>>   arch/powerpc/include/asm/kvm_host.h |    5 +++++
>>   arch/s390/include/asm/kvm_host.h    |    5 +++++
>>   arch/x86/include/asm/kvm_host.h     |    2 +-
>>   arch/x86/kvm/x86.c                  |    8 ++++++++
>>   include/linux/kvm_host.h            |    2 +-
>>   virt/kvm/kvm_main.c                 |    6 ++++--
>>   7 files changed, 29 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h
>> index 989dd3f..999ab15 100644
>> --- a/arch/ia64/include/asm/kvm_host.h
>> +++ b/arch/ia64/include/asm/kvm_host.h
>> @@ -595,6 +595,11 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu);
>>   int kvm_pal_emul(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
>>   void kvm_sal_emul(struct kvm_vcpu *vcpu);
>>
>> +static inline void kvm_do_schedule(struct kvm_vcpu *vcpu)
>> +{
>> +	schedule();
>> +}
>> +
>>   #define __KVM_HAVE_ARCH_VM_ALLOC 1
>>   struct kvm *kvm_arch_alloc_vm(void);
>>   void kvm_arch_free_vm(struct kvm *kvm);
>> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
>> index af326cd..1aeecc0 100644
>> --- a/arch/powerpc/include/asm/kvm_host.h
>> +++ b/arch/powerpc/include/asm/kvm_host.h
>> @@ -628,4 +628,9 @@ struct kvm_vcpu_arch {
>>   #define __KVM_HAVE_ARCH_WQP
>>   #define __KVM_HAVE_CREATE_DEVICE
>>
>> +static inline void kvm_do_schedule(struct kvm_vcpu *vcpu)
>> +{
>> +	schedule();
>> +}
>> +
>>   #endif /* __POWERPC_KVM_HOST_H__ */
>> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
>> index 16bd5d1..db09a56 100644
>> --- a/arch/s390/include/asm/kvm_host.h
>> +++ b/arch/s390/include/asm/kvm_host.h
>> @@ -266,4 +266,9 @@ struct kvm_arch{
>>   };
>>
>>   extern int sie64a(struct kvm_s390_sie_block *, u64 *);
>> +static inline void kvm_do_schedule(struct kvm_vcpu *vcpu)
>> +{
>> +	schedule();
>> +}
>> +
>>   #endif
>> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
>> index 95702de..72ff791 100644
>> --- a/arch/x86/include/asm/kvm_host.h
>> +++ b/arch/x86/include/asm/kvm_host.h
>> @@ -1042,5 +1042,5 @@ int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
>>   int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data);
>>   void kvm_handle_pmu_event(struct kvm_vcpu *vcpu);
>>   void kvm_deliver_pmi(struct kvm_vcpu *vcpu);
>> -
>> +void kvm_do_schedule(struct kvm_vcpu *vcpu);
>>   #endif /* _ASM_X86_KVM_HOST_H */
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index b963c86..d26c4be 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -7281,6 +7281,14 @@ bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
>>   			kvm_x86_ops->interrupt_allowed(vcpu);
>>   }
>>
>> +void kvm_do_schedule(struct kvm_vcpu *vcpu)
>> +{
>> +	/* We try to yield to a kikced vcpu else do a schedule */
>
> s/kikced/kicked/

:(.  Thanks .. will change that.

>
[...]

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