From: Alexander Graf <agraf@suse.de>
To: Avi Kivity <avi@redhat.com>
Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
KVM list <kvm@vger.kernel.org>,
kvm-ppc@vger.kernel.org
Subject: Re: [PATCH 01/26] KVM: PPC: Introduce shared page
Date: Tue, 29 Jun 2010 11:54:41 +0200 [thread overview]
Message-ID: <4C29C2E1.4000706@suse.de> (raw)
In-Reply-To: <4C274028.7020105@redhat.com>
Avi Kivity wrote:
> On 06/26/2010 02:24 AM, Alexander Graf wrote:
>> For transparent variable sharing between the hypervisor and guest, I
>> introduce
>> a shared page. This shared page will contain all the registers the
>> guest can
>> read and write safely without exiting guest context.
>>
>> This patch only implements the stubs required for the basic structure
>> of the
>> shared page. The actual register moving follows.
>>
>>
>> @@ -123,8 +123,14 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct
>> kvm *kvm, unsigned int id)
>> if (err)
>> goto free_vcpu;
>>
>> + vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
>> + if (!vcpu->arch.shared)
>> + goto uninit_vcpu;
>> +
>> return vcpu;
>>
>> +uninit_vcpu:
>> + kvm_vcpu_uninit(vcpu);
>> free_vcpu:
>> kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
>> out:
>> @@ -135,6 +141,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
>> {
>> struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu);
>>
>> + free_page((unsigned long)vcpu->arch.shared);
>> kvm_vcpu_uninit(vcpu);
>> kmem_cache_free(kvm_vcpu_cache, vcpu_44x);
>> }
>> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
>> index 884d4a5..ba79b35 100644
>> --- a/arch/powerpc/kvm/book3s.c
>> +++ b/arch/powerpc/kvm/book3s.c
>> @@ -1247,6 +1247,10 @@ struct kvm_vcpu
>> *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
>> if (err)
>> goto free_shadow_vcpu;
>>
>> + vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
>> + if (!vcpu->arch.shared)
>> + goto uninit_vcpu;
>> +
>> vcpu->arch.host_retip = kvm_return_point;
>> vcpu->arch.host_msr = mfmsr();
>> #ifdef CONFIG_PPC_BOOK3S_64
>> @@ -1277,6 +1281,8 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct
>> kvm *kvm, unsigned int id)
>>
>> return vcpu;
>>
>> +uninit_vcpu:
>> + kvm_vcpu_uninit(vcpu);
>> free_shadow_vcpu:
>> kfree(vcpu_book3s->shadow_vcpu);
>> free_vcpu:
>> @@ -1289,6 +1295,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
>> {
>> struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
>>
>> + free_page((unsigned long)vcpu->arch.shared);
>> kvm_vcpu_uninit(vcpu);
>> kfree(vcpu_book3s->shadow_vcpu);
>> vfree(vcpu_book3s);
>> diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c
>> index e8a00b0..71750f2 100644
>> --- a/arch/powerpc/kvm/e500.c
>> +++ b/arch/powerpc/kvm/e500.c
>> @@ -117,8 +117,14 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct
>> kvm *kvm, unsigned int id)
>> if (err)
>> goto uninit_vcpu;
>>
>> + vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
>> + if (!vcpu->arch.shared)
>> + goto uninit_tlb;
>> +
>> return vcpu;
>>
>> +uninit_tlb:
>> + kvmppc_e500_tlb_uninit(vcpu_e500);
>> uninit_vcpu:
>> kvm_vcpu_uninit(vcpu);
>> free_vcpu:
>> @@ -131,6 +137,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
>> {
>> struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
>>
>> + free_page((unsigned long)vcpu->arch.shared);
>> kvmppc_e500_tlb_uninit(vcpu_e500);
>> kvm_vcpu_uninit(vcpu);
>> kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
>>
>
> Code repeats 3x. Share please.
Looking at this again, I could combine the 3 lines of init code into 3
lines of code that do a generic function call and then error checking.
And I could convert the one free_page line with one function call that
would free the page. Is there a real gain behind this?
Alex
next prev parent reply other threads:[~2010-06-29 9:54 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-25 23:24 [PATCH 00/26] KVM PPC PV framework Alexander Graf
2010-06-25 23:24 ` [PATCH 01/26] KVM: PPC: Introduce shared page Alexander Graf
2010-06-27 12:12 ` Avi Kivity
2010-06-29 9:54 ` Alexander Graf [this message]
2010-06-29 10:55 ` Avi Kivity
2010-06-25 23:24 ` [PATCH 02/26] KVM: PPC: Convert MSR to " Alexander Graf
2010-06-27 8:16 ` Avi Kivity
2010-06-27 9:38 ` Alexander Graf
2010-06-27 9:50 ` Avi Kivity
2010-06-27 10:40 ` Alexander Graf
2010-06-25 23:24 ` [PATCH 03/26] KVM: PPC: Convert DSISR " Alexander Graf
2010-06-25 23:24 ` [PATCH 04/26] KVM: PPC: Convert DAR " Alexander Graf
2010-06-25 23:24 ` [PATCH 05/26] KVM: PPC: Convert SRR0 and SRR1 " Alexander Graf
2010-06-25 23:24 ` [PATCH 06/26] KVM: PPC: Convert SPRG[0-4] " Alexander Graf
2010-06-25 23:24 ` [PATCH 07/26] KVM: PPC: Implement hypervisor interface Alexander Graf
2010-06-25 23:24 ` [PATCH 08/26] KVM: PPC: Add PV guest critical sections Alexander Graf
2010-06-27 8:21 ` Avi Kivity
2010-06-27 9:40 ` Alexander Graf
2010-06-27 9:52 ` Avi Kivity
2010-06-27 10:33 ` Alexander Graf
2010-06-27 10:59 ` Avi Kivity
2010-06-27 11:49 ` Alexander Graf
2010-06-27 11:53 ` Avi Kivity
2010-06-27 12:06 ` Alexander Graf
2010-06-27 22:03 ` Benjamin Herrenschmidt
2010-06-27 10:03 ` Avi Kivity
2010-06-27 10:35 ` Alexander Graf
2010-06-25 23:24 ` [PATCH 09/26] KVM: PPC: Add PV guest scratch registers Alexander Graf
2010-06-27 8:22 ` Avi Kivity
2010-06-27 9:41 ` Alexander Graf
2010-06-27 9:53 ` Avi Kivity
2010-06-25 23:24 ` [PATCH 10/26] KVM: PPC: Tell guest about pending interrupts Alexander Graf
2010-06-25 23:24 ` [PATCH 11/26] KVM: PPC: Make RMO a define Alexander Graf
2010-06-26 16:52 ` Segher Boessenkool
2010-06-27 9:08 ` Alexander Graf
2010-06-29 7:32 ` Segher Boessenkool
2010-06-29 7:39 ` Alexander Graf
2010-06-29 7:52 ` Segher Boessenkool
2010-06-29 8:04 ` Alexander Graf
2010-06-25 23:25 ` [PATCH 12/26] KVM: PPC: First magic page steps Alexander Graf
2010-06-27 8:24 ` Avi Kivity
2010-06-27 9:44 ` Alexander Graf
2010-06-25 23:25 ` [PATCH 13/26] KVM: PPC: Magic Page Book3s support Alexander Graf
2010-06-25 23:25 ` [PATCH 14/26] KVM: PPC: Magic Page BookE support Alexander Graf
2010-06-25 23:25 ` [PATCH 15/26] KVM: PPC: Expose magic page support to guest Alexander Graf
2010-06-25 23:25 ` [PATCH 16/26] KVM: Move kvm_guest_init out of generic code Alexander Graf
2010-06-25 23:25 ` [PATCH 17/26] KVM: PPC: Generic KVM PV guest support Alexander Graf
2010-06-25 23:25 ` [PATCH 18/26] KVM: PPC: KVM PV guest stubs Alexander Graf
2010-06-27 8:28 ` Avi Kivity
2010-06-27 9:47 ` Alexander Graf
2010-06-27 10:16 ` Avi Kivity
2010-06-27 10:38 ` Alexander Graf
2010-06-27 22:04 ` Benjamin Herrenschmidt
2010-06-28 4:39 ` Matt Evans
2010-06-28 6:33 ` Alexander Graf
2010-06-28 8:15 ` Avi Kivity
2010-06-28 8:23 ` Alexander Graf
2010-06-28 8:33 ` Avi Kivity
2010-06-25 23:25 ` [PATCH 19/26] KVM: PPC: PV instructions to loads and stores Alexander Graf
2010-06-25 23:25 ` [PATCH 20/26] KVM: PPC: PV tlbsync to nop Alexander Graf
2010-06-25 23:25 ` [PATCH 21/26] KVM: PPC: Introduce kvm_tmp framework Alexander Graf
2010-06-25 23:25 ` [PATCH 22/26] KVM: PPC: PV assembler helpers Alexander Graf
2010-06-25 23:25 ` [PATCH 23/26] KVM: PPC: PV mtmsrd L=1 Alexander Graf
2010-06-25 23:25 ` [PATCH 24/26] KVM: PPC: PV mtmsrd L=0 and mtmsr Alexander Graf
2010-06-26 17:03 ` Segher Boessenkool
2010-06-27 9:10 ` Alexander Graf
2010-06-29 7:37 ` Segher Boessenkool
2010-06-25 23:25 ` [PATCH 25/26] KVM: PPC: PV wrteei Alexander Graf
2010-06-25 23:25 ` [PATCH 26/26] KVM: PPC: Add Documentation about PV interface Alexander Graf
2010-06-27 8:14 ` Avi Kivity
2010-06-27 9:33 ` Alexander Graf
[not found] ` <4C270876.2050806%40redhat.com>
2010-06-28 7:18 ` Milton Miller
2010-06-28 7:49 ` Alexander Graf
2010-06-28 8:13 ` Avi Kivity
2010-06-28 8:21 ` Alexander Graf
2010-06-28 8:32 ` Avi Kivity
2010-06-27 8:34 ` Avi Kivity
2010-06-27 9:49 ` Alexander Graf
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