From: Catalin Marinas <catalin.marinas@arm.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
ankita@nvidia.com,
Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
oliver.upton@linux.dev, suzuki.poulose@arm.com,
yuzenghui@huawei.com, will@kernel.org, ardb@kernel.org,
akpm@linux-foundation.org, gshan@redhat.com, aniketa@nvidia.com,
cjia@nvidia.com, kwankhede@nvidia.com, targupta@nvidia.com,
vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com,
jhubbard@nvidia.com, danw@nvidia.com, mochs@nvidia.com,
kvmarm@lists.linux.dev, kvm@vger.kernel.org,
lpieralisi@kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 1/1] KVM: arm64: allow the VM to select DEVICE_* and NORMAL_NC for IO memory
Date: Tue, 5 Dec 2023 18:40:42 +0000 [thread overview]
Message-ID: <ZW9uqu7yOtyZfmvC@arm.com> (raw)
In-Reply-To: <86a5qobkt8.wl-maz@kernel.org>
On Tue, Dec 05, 2023 at 05:50:27PM +0000, Marc Zyngier wrote:
> On Tue, 05 Dec 2023 17:33:01 +0000,
> Catalin Marinas <catalin.marinas@arm.com> wrote:
> > Ideally we should do this for vfio only but we don't have an easy
> > way to convey this to KVM.
>
> But if we want to limit this to PCIe, we'll have to find out. The
> initial proposal (a long while ago) had a flag conveying some
> information, and I'd definitely feel more confident having something
> like that.
We can add a VM_PCI_IO in the high vma flags to be set by
vfio_pci_core_mmap(), though it limits it to 64-bit architectures. KVM
knows this is PCI and relaxes things a bit. It's not generic though if
we need this later for something else.
A question for Lorenzo: do these BARs appear in iomem_resource? We could
search that up instead of a flag, something like the page_is_ram()
helper.
--
Catalin
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
ankita@nvidia.com,
Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
oliver.upton@linux.dev, suzuki.poulose@arm.com,
yuzenghui@huawei.com, will@kernel.org, ardb@kernel.org,
akpm@linux-foundation.org, gshan@redhat.com, aniketa@nvidia.com,
cjia@nvidia.com, kwankhede@nvidia.com, targupta@nvidia.com,
vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com,
jhubbard@nvidia.com, danw@nvidia.com, mochs@nvidia.com,
kvmarm@lists.linux.dev, kvm@vger.kernel.org,
lpieralisi@kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 1/1] KVM: arm64: allow the VM to select DEVICE_* and NORMAL_NC for IO memory
Date: Tue, 5 Dec 2023 18:40:42 +0000 [thread overview]
Message-ID: <ZW9uqu7yOtyZfmvC@arm.com> (raw)
In-Reply-To: <86a5qobkt8.wl-maz@kernel.org>
On Tue, Dec 05, 2023 at 05:50:27PM +0000, Marc Zyngier wrote:
> On Tue, 05 Dec 2023 17:33:01 +0000,
> Catalin Marinas <catalin.marinas@arm.com> wrote:
> > Ideally we should do this for vfio only but we don't have an easy
> > way to convey this to KVM.
>
> But if we want to limit this to PCIe, we'll have to find out. The
> initial proposal (a long while ago) had a flag conveying some
> information, and I'd definitely feel more confident having something
> like that.
We can add a VM_PCI_IO in the high vma flags to be set by
vfio_pci_core_mmap(), though it limits it to 64-bit architectures. KVM
knows this is PCI and relaxes things a bit. It's not generic though if
we need this later for something else.
A question for Lorenzo: do these BARs appear in iomem_resource? We could
search that up instead of a flag, something like the page_is_ram()
helper.
--
Catalin
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-12-05 18:40 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-05 3:30 [PATCH v2 1/1] KVM: arm64: allow the VM to select DEVICE_* and NORMAL_NC for IO memory ankita
2023-12-05 3:30 ` ankita
2023-12-05 9:21 ` Marc Zyngier
2023-12-05 9:21 ` Marc Zyngier
2023-12-05 11:40 ` Catalin Marinas
2023-12-05 11:40 ` Catalin Marinas
2023-12-05 13:05 ` Jason Gunthorpe
2023-12-05 13:05 ` Jason Gunthorpe
2023-12-05 14:37 ` Lorenzo Pieralisi
2023-12-05 14:37 ` Lorenzo Pieralisi
2023-12-05 14:44 ` Jason Gunthorpe
2023-12-05 14:44 ` Jason Gunthorpe
2023-12-05 16:24 ` Catalin Marinas
2023-12-05 16:24 ` Catalin Marinas
2023-12-05 17:10 ` Jason Gunthorpe
2023-12-05 17:10 ` Jason Gunthorpe
2023-12-05 16:22 ` Catalin Marinas
2023-12-05 16:22 ` Catalin Marinas
2023-12-05 16:43 ` Jason Gunthorpe
2023-12-05 16:43 ` Jason Gunthorpe
2023-12-05 17:01 ` Marc Zyngier
2023-12-05 17:01 ` Marc Zyngier
2023-12-05 17:33 ` Catalin Marinas
2023-12-05 17:33 ` Catalin Marinas
2023-12-05 17:50 ` Marc Zyngier
2023-12-05 17:50 ` Marc Zyngier
2023-12-05 18:40 ` Catalin Marinas [this message]
2023-12-05 18:40 ` Catalin Marinas
2023-12-06 11:39 ` Marc Zyngier
2023-12-06 11:39 ` Marc Zyngier
2023-12-06 12:14 ` Catalin Marinas
2023-12-06 12:14 ` Catalin Marinas
2023-12-06 15:16 ` Jason Gunthorpe
2023-12-06 15:16 ` Jason Gunthorpe
2023-12-06 16:31 ` Catalin Marinas
2023-12-06 16:31 ` Catalin Marinas
2023-12-06 17:20 ` Jason Gunthorpe
2023-12-06 17:20 ` Jason Gunthorpe
2023-12-06 18:58 ` Catalin Marinas
2023-12-06 18:58 ` Catalin Marinas
2023-12-06 19:03 ` Jason Gunthorpe
2023-12-06 19:03 ` Jason Gunthorpe
2023-12-06 19:06 ` Catalin Marinas
2023-12-06 19:06 ` Catalin Marinas
2023-12-07 2:53 ` Ankit Agrawal
2023-12-07 2:53 ` Ankit Agrawal
2023-12-06 11:52 ` Lorenzo Pieralisi
2023-12-06 11:52 ` Lorenzo Pieralisi
2023-12-05 19:24 ` Catalin Marinas
2023-12-05 19:24 ` Catalin Marinas
2023-12-05 19:48 ` Jason Gunthorpe
2023-12-05 19:48 ` Jason Gunthorpe
2023-12-06 14:49 ` Catalin Marinas
2023-12-06 14:49 ` Catalin Marinas
2023-12-06 15:05 ` Jason Gunthorpe
2023-12-06 15:05 ` Jason Gunthorpe
2023-12-06 15:18 ` Lorenzo Pieralisi
2023-12-06 15:18 ` Lorenzo Pieralisi
2023-12-06 15:38 ` Jason Gunthorpe
2023-12-06 15:38 ` Jason Gunthorpe
2023-12-06 16:23 ` Catalin Marinas
2023-12-06 16:23 ` Catalin Marinas
2023-12-06 16:48 ` Jason Gunthorpe
2023-12-06 16:48 ` Jason Gunthorpe
2023-12-07 10:13 ` Lorenzo Pieralisi
2023-12-07 10:13 ` Lorenzo Pieralisi
2023-12-07 13:38 ` Jason Gunthorpe
2023-12-07 13:38 ` Jason Gunthorpe
2023-12-07 14:50 ` Lorenzo Pieralisi
2023-12-07 14:50 ` Lorenzo Pieralisi
2023-12-05 13:28 ` Lorenzo Pieralisi
2023-12-05 13:28 ` Lorenzo Pieralisi
2023-12-05 14:16 ` Shameerali Kolothum Thodi
2023-12-05 14:16 ` Shameerali Kolothum Thodi
2023-12-06 8:17 ` Shameerali Kolothum Thodi
2023-12-06 8:17 ` Shameerali Kolothum Thodi
2023-12-05 11:48 ` Catalin Marinas
2023-12-05 11:48 ` Catalin Marinas
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