From: Will Deacon <will@kernel.org> To: Srivatsa Vaddagiri <vatsa@codeaurora.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 11:08:22 +0100 [thread overview] Message-ID: <20200430100821.GC19932@willie-the-truck> (raw) In-Reply-To: <1588240976-10213-1-git-send-email-vatsa@codeaurora.org> On Thu, Apr 30, 2020 at 03:32:55PM +0530, Srivatsa Vaddagiri wrote: > The Type-1 hypervisor we are dealing with does not allow for MMIO transport. > [1] summarizes some of the problems we have in making virtio work on such > hypervisors. This patch proposes a solution for transport problem viz how we can > do config space IO on such a hypervisor. Hypervisor specific methods > introduced allows for seamless IO of config space. Seamless huh? You'd hope that might obviate the need for extra patches... > 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? Will
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From: Will Deacon <will@kernel.org> To: Srivatsa Vaddagiri <vatsa@codeaurora.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 11:08:22 +0100 [thread overview] Message-ID: <20200430100821.GC19932@willie-the-truck> (raw) In-Reply-To: <1588240976-10213-1-git-send-email-vatsa@codeaurora.org> On Thu, Apr 30, 2020 at 03:32:55PM +0530, Srivatsa Vaddagiri wrote: > The Type-1 hypervisor we are dealing with does not allow for MMIO transport. > [1] summarizes some of the problems we have in making virtio work on such > hypervisors. This patch proposes a solution for transport problem viz how we can > do config space IO on such a hypervisor. Hypervisor specific methods > introduced allows for seamless IO of config space. Seamless huh? You'd hope that might obviate the need for extra patches... > 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? Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-04-30 10:08 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 [this message] 2020-04-30 10:08 ` Will Deacon 2020-04-30 10:29 ` Srivatsa Vaddagiri 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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