From: David Hildenbrand <david@redhat.com>
To: ankita@nvidia.com, jgg@nvidia.com, maz@kernel.org,
oliver.upton@linux.dev, joey.gouly@arm.com,
suzuki.poulose@arm.com, yuzenghui@huawei.com,
catalin.marinas@arm.com, will@kernel.org, ryan.roberts@arm.com,
shahuang@redhat.com, lpieralisi@kernel.org, ddutile@redhat.com,
seanjc@google.com
Cc: 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 v9 1/6] KVM: arm64: Rename the device variable to s2_force_noncacheable
Date: Fri, 4 Jul 2025 15:57:17 +0200 [thread overview]
Message-ID: <126f839c-f0e5-42a4-a172-2cefd59e5750@redhat.com> (raw)
In-Reply-To: <20250621042111.3992-2-ankita@nvidia.com>
On 21.06.25 06:21, 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>
> Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
> ---
Reviewed-by: David Hildenbrand <david@redhat.com>
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2025-07-04 13:57 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-21 4:21 [PATCH v9 0/6] KVM: arm64: Map GPU device memory as cacheable ankita
2025-06-21 4:21 ` [PATCH v9 1/6] KVM: arm64: Rename the device variable to s2_force_noncacheable ankita
2025-07-04 13:41 ` Jason Gunthorpe
2025-07-04 13:57 ` David Hildenbrand [this message]
2025-06-21 4:21 ` [PATCH v9 2/6] KVM: arm64: Update the check to detect device memory ankita
2025-07-04 13:43 ` Jason Gunthorpe
2025-07-04 14:02 ` David Hildenbrand
2025-06-21 4:21 ` [PATCH v9 3/6] KVM: arm64: Block cacheable PFNMAP mapping ankita
2025-06-27 13:49 ` Will Deacon
2025-06-30 1:56 ` Ankit Agrawal
2025-06-30 12:25 ` Jason Gunthorpe
2025-07-04 12:21 ` David Hildenbrand
2025-07-04 16:04 ` Will Deacon
2025-07-04 16:47 ` Jason Gunthorpe
2025-07-08 12:47 ` Will Deacon
2025-07-04 13:45 ` Jason Gunthorpe
2025-07-04 14:09 ` David Hildenbrand
2025-06-21 4:21 ` [PATCH v9 4/6] KVM: arm64: New function to determine hardware cache management support ankita
2025-07-04 13:47 ` Jason Gunthorpe
2025-07-04 14:10 ` David Hildenbrand
2025-06-21 4:21 ` [PATCH v9 5/6] KVM: arm64: Allow cacheable stage 2 mapping using VMA flags ankita
2025-07-04 14:04 ` Jason Gunthorpe
2025-07-04 14:13 ` David Hildenbrand
2025-07-04 16:51 ` Ankit Agrawal
2025-06-21 4:21 ` [PATCH v9 6/6] KVM: arm64: Expose new KVM cap for cacheable PFNMAP ankita
2025-07-04 13:44 ` Jason Gunthorpe
2025-07-04 14:15 ` David Hildenbrand
2025-07-04 15:04 ` Jason Gunthorpe
2025-07-04 16:20 ` Ankit Agrawal
2025-07-04 16:56 ` Jason Gunthorpe
2025-06-27 5:03 ` [PATCH v9 0/6] KVM: arm64: Map GPU device memory as cacheable Ankit Agrawal
2025-07-02 9:33 ` Ankit Agrawal
2025-07-02 16:51 ` Donald Dutile
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