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From: Srivatsa Vaddagiri <vatsa@codeaurora.org>
To: Will Deacon <will@kernel.org>
Cc: konrad.wilk@oracle.com, mst@redhat.com, jasowang@redhat.com,
	jan.kiszka@siemens.com, stefano.stabellini@xilinx.com,
	iommu@lists.linux-foundation.org,
	virtualization@lists.linux-foundation.org,
	virtio-dev@lists.oasis-open.org, tsoni@codeaurora.org,
	pratikp@codeaurora.org, christoffer.dall@arm.com,
	alex.bennee@linaro.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC/PATCH 0/1] virtio_mmio: hypervisor specific interfaces for MMIO
Date: Thu, 30 Apr 2020 15:59:39 +0530	[thread overview]
Message-ID: <20200430102939.GG5097@quicinc.com> (raw)
In-Reply-To: <20200430100821.GC19932@willie-the-truck>

* Will Deacon <will@kernel.org> [2020-04-30 11:08:22]:

> > This patch is meant to seek comments. If its considered to be in right
> > direction, will work on making it more complete and send the next version!
> 
> What's stopping you from implementing the trapping support in the
> hypervisor? Unlike the other patches you sent out, where the guest memory
> is not accessible to the host, there doesn't seem to be any advantage to
> not having trapping support, or am I missing something here?

Hi Will,
	I have had this discussion with hypervisor folks. They seem to be
concerned about complexity of having a VM's fault be handled in another
untrusted VM. They are not keen to add MMIO support.

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation

WARNING: multiple messages have this Message-ID (diff)
From: Srivatsa Vaddagiri <vatsa@codeaurora.org>
To: Will Deacon <will@kernel.org>
Cc: tsoni@codeaurora.org, virtio-dev@lists.oasis-open.org,
	mst@redhat.com, jan.kiszka@siemens.com, jasowang@redhat.com,
	konrad.wilk@oracle.com, christoffer.dall@arm.com,
	virtualization@lists.linux-foundation.org,
	alex.bennee@linaro.org, iommu@lists.linux-foundation.org,
	stefano.stabellini@xilinx.com, pratikp@codeaurora.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC/PATCH 0/1] virtio_mmio: hypervisor specific interfaces for MMIO
Date: Thu, 30 Apr 2020 15:59:39 +0530	[thread overview]
Message-ID: <20200430102939.GG5097@quicinc.com> (raw)
In-Reply-To: <20200430100821.GC19932@willie-the-truck>

* Will Deacon <will@kernel.org> [2020-04-30 11:08:22]:

> > This patch is meant to seek comments. If its considered to be in right
> > direction, will work on making it more complete and send the next version!
> 
> What's stopping you from implementing the trapping support in the
> hypervisor? Unlike the other patches you sent out, where the guest memory
> is not accessible to the host, there doesn't seem to be any advantage to
> not having trapping support, or am I missing something here?

Hi Will,
	I have had this discussion with hypervisor folks. They seem to be
concerned about complexity of having a VM's fault be handled in another
untrusted VM. They are not keen to add MMIO support.

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2020-04-30 10:30 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-30 10:02 [RFC/PATCH 0/1] virtio_mmio: hypervisor specific interfaces for MMIO Srivatsa Vaddagiri
2020-04-30 10:02 ` Srivatsa Vaddagiri
2020-04-30 10:02 ` [RFC/PATCH 1/1] virtio: Introduce MMIO ops Srivatsa Vaddagiri
2020-04-30 10:02   ` Srivatsa Vaddagiri
2020-04-30 10:14   ` Will Deacon
2020-04-30 10:14     ` Will Deacon
2020-04-30 10:34     ` Srivatsa Vaddagiri
2020-04-30 10:34       ` Srivatsa Vaddagiri
2020-04-30 10:41       ` Will Deacon
2020-04-30 10:41         ` Will Deacon
2020-04-30 11:11         ` Srivatsa Vaddagiri
2020-04-30 11:11           ` Srivatsa Vaddagiri
2020-04-30 12:59           ` Jan Kiszka
2020-04-30 12:59             ` [virtio-dev] " Jan Kiszka
2020-04-30 12:59             ` Jan Kiszka
2020-04-30 13:33             ` Srivatsa Vaddagiri
2020-04-30 13:33               ` Srivatsa Vaddagiri
2020-04-30 13:33               ` Srivatsa Vaddagiri
2020-04-30 19:34               ` Michael S. Tsirkin
2020-04-30 19:34                 ` [virtio-dev] " Michael S. Tsirkin
2020-04-30 19:34                 ` Michael S. Tsirkin
2020-04-30 10:07 ` [RFC/PATCH 0/1] virtio_mmio: hypervisor specific interfaces for MMIO Michael S. Tsirkin
2020-04-30 10:07   ` [virtio-dev] " Michael S. Tsirkin
2020-04-30 10:07   ` Michael S. Tsirkin
2020-04-30 10:40   ` Srivatsa Vaddagiri
2020-04-30 10:40     ` Srivatsa Vaddagiri
2020-04-30 10:56   ` Jason Wang
2020-04-30 10:56     ` [virtio-dev] " Jason Wang
2020-04-30 10:56     ` Jason Wang
2020-04-30 10:08 ` Will Deacon
2020-04-30 10:08   ` Will Deacon
2020-04-30 10:29   ` Srivatsa Vaddagiri [this message]
2020-04-30 10:29     ` Srivatsa Vaddagiri
2020-04-30 10:39     ` Will Deacon
2020-04-30 10:39       ` Will Deacon
2020-04-30 11:02       ` Srivatsa Vaddagiri
2020-04-30 11:02         ` Srivatsa Vaddagiri
2020-04-30 11:02         ` Srivatsa Vaddagiri

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