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Thu, 30 Apr 2020 10:29:48 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 8E59EC432C2; Thu, 30 Apr 2020 10:29:47 +0000 (UTC) Received: from quicinc.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: svaddagi) by smtp.codeaurora.org (Postfix) with ESMTPSA id EF410C433CB; Thu, 30 Apr 2020 10:29:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org EF410C433CB Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=vatsa@codeaurora.org Date: Thu, 30 Apr 2020 15:59:39 +0530 From: Srivatsa Vaddagiri To: Will Deacon Subject: Re: [RFC/PATCH 0/1] virtio_mmio: hypervisor specific interfaces for MMIO Message-ID: <20200430102939.GG5097@quicinc.com> References: <1588240976-10213-1-git-send-email-vatsa@codeaurora.org> <20200430100821.GC19932@willie-the-truck> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200430100821.GC19932@willie-the-truck> User-Agent: Mutt/1.5.24 (2015-08-30) 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 X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Srivatsa Vaddagiri Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" * Will Deacon [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