From: Avi Kivity <avi@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, mingo@elte.hu,
a.p.zijlstra@chello.nl, tglx@linutronix.de, hpa@zytor.com,
riel@redhat.com
Subject: Re: [PATCH v2 09/12] Retry fault before vmentry
Date: Wed, 25 Nov 2009 15:09:36 +0200 [thread overview]
Message-ID: <4B0D2C90.2060200@redhat.com> (raw)
In-Reply-To: <1258985167-29178-10-git-send-email-gleb@redhat.com>
On 11/23/2009 04:06 PM, Gleb Natapov wrote:
> When page is swapped in it is mapped into guest memory only after guest
> tries to access it again and generate another fault. To save this fault
> we can map it immediately since we know that guest is going to access
> the page.
>
>
> -static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
> +static int tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t cr3, gva_t gpa,
> u32 error_code)
> {
> pfn_t pfn;
> @@ -2230,7 +2233,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
> mmu_seq = vcpu->kvm->mmu_notifier_seq;
> smp_rmb();
>
> - if (can_do_async_pf(vcpu)) {
> + if (cr3 == vcpu->arch.cr3&& can_do_async_pf(vcpu)) {
>
Why check cr3 here?
> -static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
> +static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t cr3, gva_t addr,
> u32 error_code)
>
I'd be slightly happier if we had a page_fault_other_cr3() op that
switched cr3, called the original, then switched back (the tdp version
need not change anything).
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, mingo@elte.hu,
a.p.zijlstra@chello.nl, tglx@linutronix.de, hpa@zytor.com,
riel@redhat.com
Subject: Re: [PATCH v2 09/12] Retry fault before vmentry
Date: Wed, 25 Nov 2009 15:09:36 +0200 [thread overview]
Message-ID: <4B0D2C90.2060200@redhat.com> (raw)
In-Reply-To: <1258985167-29178-10-git-send-email-gleb@redhat.com>
On 11/23/2009 04:06 PM, Gleb Natapov wrote:
> When page is swapped in it is mapped into guest memory only after guest
> tries to access it again and generate another fault. To save this fault
> we can map it immediately since we know that guest is going to access
> the page.
>
>
> -static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
> +static int tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t cr3, gva_t gpa,
> u32 error_code)
> {
> pfn_t pfn;
> @@ -2230,7 +2233,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
> mmu_seq = vcpu->kvm->mmu_notifier_seq;
> smp_rmb();
>
> - if (can_do_async_pf(vcpu)) {
> + if (cr3 == vcpu->arch.cr3&& can_do_async_pf(vcpu)) {
>
Why check cr3 here?
> -static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
> +static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t cr3, gva_t addr,
> u32 error_code)
>
I'd be slightly happier if we had a page_fault_other_cr3() op that
switched cr3, called the original, then switched back (the tdp version
need not change anything).
--
error compiling committee.c: too many arguments to function
--
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next prev parent reply other threads:[~2009-11-25 13:09 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-23 14:05 [PATCH v2 00/12] KVM: Add asynchronous page fault for PV guest Gleb Natapov
2009-11-23 14:05 ` Gleb Natapov
2009-11-23 14:05 ` [PATCH v2 01/12] Move kvm_smp_prepare_boot_cpu() from kvmclock.c to kvm.c Gleb Natapov
2009-11-23 14:05 ` Gleb Natapov
2009-11-23 14:05 ` [PATCH v2 02/12] Add PV MSR to enable asynchronous page faults delivery Gleb Natapov
2009-11-23 14:05 ` Gleb Natapov
2009-11-25 12:32 ` Avi Kivity
2009-11-25 12:32 ` Avi Kivity
2009-11-23 14:05 ` [PATCH v2 03/12] Add async PF initialization to PV guest Gleb Natapov
2009-11-23 14:05 ` Gleb Natapov
2009-11-23 14:05 ` [PATCH v2 04/12] Add "handle page fault" PV helper Gleb Natapov
2009-11-23 14:05 ` Gleb Natapov
2009-11-23 15:32 ` Peter Zijlstra
2009-11-23 15:32 ` Peter Zijlstra
2009-11-23 14:06 ` [PATCH v2 05/12] Handle asynchronous page fault in a PV guest Gleb Natapov
2009-11-23 14:06 ` Gleb Natapov
2009-11-25 12:45 ` Avi Kivity
2009-11-25 12:45 ` Avi Kivity
2009-11-23 14:06 ` [PATCH v2 06/12] Export __get_user_pages_fast Gleb Natapov
2009-11-23 14:06 ` Gleb Natapov
2009-11-23 14:06 ` [PATCH v2 07/12] Add get_user_pages() variant that fails if major fault is required Gleb Natapov
2009-11-23 14:06 ` Gleb Natapov
2009-11-23 14:06 ` [PATCH v2 08/12] Inject asynchronous page fault into a guest if page is swapped out Gleb Natapov
2009-11-23 14:06 ` Gleb Natapov
2009-11-25 13:03 ` Avi Kivity
2009-11-25 13:03 ` Avi Kivity
2009-11-23 14:06 ` [PATCH v2 09/12] Retry fault before vmentry Gleb Natapov
2009-11-23 14:06 ` Gleb Natapov
2009-11-25 13:09 ` Avi Kivity [this message]
2009-11-25 13:09 ` Avi Kivity
2009-11-25 13:20 ` Gleb Natapov
2009-11-25 13:20 ` Gleb Natapov
2009-11-23 14:06 ` [PATCH v2 10/12] Maintain preemptability count even for !CONFIG_PREEMPT kernels Gleb Natapov
2009-11-23 14:06 ` Gleb Natapov
2009-11-23 15:34 ` Peter Zijlstra
2009-11-23 15:34 ` Peter Zijlstra
2009-11-23 15:58 ` Gleb Natapov
2009-11-23 15:58 ` Gleb Natapov
2009-11-23 17:30 ` Christoph Lameter
2009-11-23 17:30 ` Christoph Lameter
2009-11-24 7:12 ` Gleb Natapov
2009-11-24 7:12 ` Gleb Natapov
2009-11-24 15:14 ` Christoph Lameter
2009-11-24 15:14 ` Christoph Lameter
2009-11-30 10:56 ` Gleb Natapov
2009-11-30 10:56 ` Gleb Natapov
2009-11-30 10:58 ` Gleb Natapov
2009-11-30 10:58 ` Gleb Natapov
2009-11-30 10:59 ` Peter Zijlstra
2009-11-30 10:59 ` Peter Zijlstra
2009-11-30 11:01 ` Avi Kivity
2009-11-30 11:01 ` Avi Kivity
2009-11-30 11:05 ` Peter Zijlstra
2009-11-30 11:05 ` Peter Zijlstra
2009-11-30 16:23 ` Christoph Lameter
2009-11-30 16:23 ` Christoph Lameter
2009-11-23 14:06 ` [PATCH v2 11/12] Handle async PF in non preemptable context Gleb Natapov
2009-11-23 14:06 ` Gleb Natapov
2009-11-23 14:06 ` [PATCH v2 12/12] Send async PF when guest is not in userspace too Gleb Natapov
2009-11-23 14:06 ` Gleb Natapov
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