From: Catalin Marinas <catalin.marinas@arm.com>
To: ankita@nvidia.com
Cc: jgg@nvidia.com, maz@kernel.org, oliver.upton@linux.dev,
joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com,
will@kernel.org, ryan.roberts@arm.com, shahuang@redhat.com,
lpieralisi@kernel.org, david@redhat.com, ddutile@redhat.com,
seanjc@google.com, aniketa@nvidia.com, cjia@nvidia.com,
kwankhede@nvidia.com, kjaju@nvidia.com, targupta@nvidia.com,
vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com,
jhubbard@nvidia.com, danw@nvidia.com, zhiw@nvidia.com,
mochs@nvidia.com, udhoke@nvidia.com, dnigam@nvidia.com,
alex.williamson@redhat.com, sebastianene@google.com,
coltonlewis@google.com, kevin.tian@intel.com, yi.l.liu@intel.com,
ardb@kernel.org, akpm@linux-foundation.org, gshan@redhat.com,
linux-mm@kvack.org, tabba@google.com, qperret@google.com,
kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, maobibo@loongson.cn
Subject: Re: [PATCH v10 1/6] KVM: arm64: Rename the device variable to s2_force_noncacheable
Date: Sun, 6 Jul 2025 19:51:13 -0500 [thread overview]
Message-ID: <aGsaAXt1PhltCIXo@arm.com> (raw)
In-Reply-To: <20250705071717.5062-2-ankita@nvidia.com>
On Sat, Jul 05, 2025 at 07:17:12AM +0000, ankita@nvidia.com wrote:
> From: Ankit Agrawal <ankita@nvidia.com>
>
> For cache maintenance on a region, ARM KVM relies on that
> region to be mapped to the Kernal virtual address as CMOs
> operate on VA.
>
> Currently the device variable is effectively trying to setup
> the S2 mapping as non cacheable for memory regions that are
> not mapped in the Kernel VA. This could be either device or
> Normal_NC depending on the VM_ALLOW_ANY_UNCACHED flag in the
> VMA.
>
> Thus "device" could be better renamed to s2_force_noncacheable
> which implies that it is ensuring that region be mapped as
> non-cacheable.
>
> CC: Catalin Marinas <catalin.marinas@arm.com>
> Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> Tested-by: Donald Dutile <ddutile@redhat.com>
> Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2025-07-07 0:51 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-05 7:17 [PATCH v10 0/6] KVM: arm64: Map GPU device memory as cacheable ankita
2025-07-05 7:17 ` [PATCH v10 1/6] KVM: arm64: Rename the device variable to s2_force_noncacheable ankita
2025-07-07 0:51 ` Catalin Marinas [this message]
2025-07-05 7:17 ` [PATCH v10 2/6] KVM: arm64: Update the check to detect device memory ankita
2025-07-07 0:52 ` Catalin Marinas
2025-07-05 7:17 ` [PATCH v10 3/6] KVM: arm64: Block cacheable PFNMAP mapping ankita
2025-07-07 0:54 ` Catalin Marinas
2025-07-05 7:17 ` [PATCH v10 4/6] KVM: arm64: New function to determine hardware cache management support ankita
2025-07-05 7:17 ` [PATCH v10 5/6] KVM: arm64: Allow cacheable stage 2 mapping using VMA flags ankita
2025-07-07 1:00 ` Catalin Marinas
2025-07-07 7:32 ` David Hildenbrand
2025-07-07 12:27 ` Jason Gunthorpe
2025-07-05 7:17 ` [PATCH v10 6/6] KVM: arm64: Expose new KVM cap for cacheable PFNMAP ankita
2025-07-07 1:02 ` Catalin Marinas
2025-07-07 16:39 ` [PATCH v10 0/6] KVM: arm64: Map GPU device memory as cacheable Ankit Agrawal
2025-07-07 23:57 ` Oliver Upton
2025-07-09 14:34 ` Ankit Agrawal
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