From: Marc Zyngier <maz@kernel.org>
To: Peter Xu <peterx@redhat.com>
Cc: kvm@vger.kernel.org, catalin.marinas@arm.com,
andrew.jones@linux.dev, will@kernel.org, shan.gavin@gmail.com,
bgardon@google.com, dmatlack@google.com, pbonzini@redhat.com,
zhenyzha@redhat.com, shuah@kernel.org,
kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH v4 3/6] KVM: arm64: Enable ring-based dirty memory tracking
Date: Fri, 30 Sep 2022 10:28:34 +0100 [thread overview]
Message-ID: <86a66h6wjh.wl-maz@kernel.org> (raw)
In-Reply-To: <YzWsY3WtmP5fS9TJ@x1n>
On Thu, 29 Sep 2022 15:32:03 +0100,
Peter Xu <peterx@redhat.com> wrote:
>
> > If I'm correct, Marc may be talking about SMMU, which is emulated in host
> > instead of QEMU. In this case, the DMA target pages are similar to those
> > pages for vgic/its tables. Both sets of pages are invisible from QEMU.
>
> OK, I'm not aware the SMMU can also be emulated in the host kernel, thanks
> Gavin. If so then we really need to think as I mentioned above since we
> will only sync this when switchover, and if the DMA range can cover a large
> portion of guest mem (assuming the physical pages to DMA can be randomly
> allocated by guest device drivers) then it may be another problem to cause
> drastic downtime.
I don't know where this is coming from. The kernel has no SMMU
emulation at all.
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2022-09-30 9:28 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-27 0:54 [PATCH v4 0/6] KVM: arm64: Enable ring-based dirty memory tracking Gavin Shan
2022-09-27 0:54 ` [PATCH v4 1/6] KVM: x86: Introduce KVM_REQ_RING_SOFT_FULL Gavin Shan
2022-09-27 10:26 ` Marc Zyngier
2022-09-27 11:31 ` Gavin Shan
2022-09-27 16:00 ` Peter Xu
2022-09-27 0:54 ` [PATCH v4 2/6] KVM: x86: Move declaration of kvm_cpu_dirty_log_size() to kvm_dirty_ring.h Gavin Shan
2022-09-27 16:00 ` Peter Xu
2022-09-27 0:54 ` [PATCH v4 3/6] KVM: arm64: Enable ring-based dirty memory tracking Gavin Shan
2022-09-27 16:02 ` Peter Xu
2022-09-27 17:32 ` Marc Zyngier
2022-09-27 18:21 ` Peter Xu
2022-09-27 23:47 ` Gavin Shan
2022-09-28 8:25 ` Marc Zyngier
2022-09-28 14:52 ` Peter Xu
2022-09-29 9:50 ` Gavin Shan
2022-09-29 11:31 ` Gavin Shan
2022-09-29 14:44 ` Marc Zyngier
2022-09-29 14:32 ` Peter Xu
2022-09-30 9:28 ` Marc Zyngier [this message]
2022-09-29 14:42 ` Marc Zyngier
2022-10-04 4:26 ` Gavin Shan
2022-10-04 4:26 ` Gavin Shan
2022-10-04 13:26 ` Peter Xu
2022-10-04 13:26 ` Peter Xu
2022-10-04 15:45 ` Marc Zyngier
2022-10-04 15:45 ` Marc Zyngier
2022-09-29 14:34 ` Marc Zyngier
2022-09-27 0:54 ` [PATCH v4 4/6] KVM: selftests: Use host page size to map ring buffer in dirty_log_test Gavin Shan
2022-09-27 0:54 ` [PATCH v4 5/6] KVM: selftests: Clear dirty ring states between two modes " Gavin Shan
2022-09-27 0:54 ` [PATCH v4 6/6] KVM: selftests: Automate choosing dirty ring size " Gavin Shan
2022-09-27 10:30 ` [PATCH v4 0/6] KVM: arm64: Enable ring-based dirty memory tracking Marc Zyngier
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