From: Paolo Bonzini <pbonzini@redhat.com>
To: Marc Zyngier <maz@kernel.org>, Gavin Shan <gshan@redhat.com>
Cc: catalin.marinas@arm.com, linux-kernel@vger.kernel.org,
shan.gavin@gmail.com, will@kernel.org,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH RFCv2 0/9] kvm/arm64: Support Async Page Fault
Date: Wed, 27 May 2020 18:10:33 +0200 [thread overview]
Message-ID: <eb2a2291-85b0-a39a-96d1-58e4652771ba@redhat.com> (raw)
In-Reply-To: <ae0f32fa338969d25dc3da56292e35ed@kernel.org>
On 27/05/20 09:48, Marc Zyngier wrote:
>
> My own question is whether this even makes any sense 10 years later.
> The HW has massively changed, and this adds a whole lot of complexity
> to both the hypervisor and the guest.
It still makes sense, but indeed it's for different reasons. One
example is host page cache sharing, where (parts of) the host page cache
are visible to the guest. In this context, async page faults are used
for any kind of host page faults, not just paging out memory due to
overcommit.
But I agree that it is very very important to design the exception model
first, as we're witnessing in x86 land the problems with a poor design.
Nothing major, but just pain all around.
Paolo
> It also plays very ugly games
> with the exception model, which doesn't give me the warm fuzzy feeling
> that it's going to be great.
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prev parent reply other threads:[~2020-05-27 16:10 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 3:29 [PATCH RFCv2 0/9] kvm/arm64: Support Async Page Fault Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 1/9] arm64: Probe for the presence of KVM hypervisor services during boot Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 2/9] arm/arm64: KVM: Advertise KVM UID to guests via SMCCC Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 3/9] kvm/arm64: Rename kvm_vcpu_get_hsr() to kvm_vcpu_get_esr() Gavin Shan
2020-05-26 10:42 ` Mark Rutland
2020-05-27 2:43 ` Gavin Shan
2020-05-27 7:20 ` Marc Zyngier
2020-05-28 6:34 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 4/9] kvm/arm64: Detach ESR operator from vCPU struct Gavin Shan
2020-05-26 10:51 ` Mark Rutland
2020-05-27 2:55 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 5/9] kvm/arm64: Replace hsr with esr Gavin Shan
2020-05-26 10:45 ` Mark Rutland
2020-05-27 2:56 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 6/9] kvm/arm64: Export kvm_handle_user_mem_abort() with prefault mode Gavin Shan
2020-05-26 10:58 ` Mark Rutland
2020-05-27 3:01 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 7/9] kvm/arm64: Support async page fault Gavin Shan
2020-05-26 12:34 ` Mark Rutland
2020-05-27 4:05 ` Gavin Shan
2020-05-27 7:37 ` Marc Zyngier
2020-05-28 6:32 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 8/9] kernel/sched: Add cpu_rq_is_locked() Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 9/9] arm64: Support async page fault Gavin Shan
2020-05-26 12:56 ` Mark Rutland
2020-05-27 6:48 ` Paolo Bonzini
2020-05-28 6:14 ` Gavin Shan
2020-05-28 7:03 ` Marc Zyngier
2020-05-28 10:53 ` Paolo Bonzini
2020-05-28 10:48 ` Paolo Bonzini
2020-05-28 23:02 ` Gavin Shan
2020-05-29 9:41 ` Marc Zyngier
2020-05-29 11:11 ` Paolo Bonzini
2020-05-31 12:44 ` Marc Zyngier
2020-06-01 9:21 ` Paolo Bonzini
2020-06-02 5:44 ` Gavin Shan
2020-05-25 23:39 ` [PATCH RFCv2 0/9] kvm/arm64: Support Async Page Fault Gavin Shan
2020-05-26 13:09 ` Mark Rutland
2020-05-27 2:39 ` Gavin Shan
2020-05-27 7:48 ` Marc Zyngier
2020-05-27 16:10 ` Paolo Bonzini [this message]
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