From: Oliver Upton <oliver.upton@linux.dev>
To: ankita@nvidia.com
Cc: jgg@nvidia.com, maz@kernel.org, james.morse@arm.com,
suzuki.poulose@arm.com, yuzenghui@huawei.com,
reinette.chatre@intel.com, surenb@google.com,
stefanha@redhat.com, brauner@kernel.org, catalin.marinas@arm.com,
will@kernel.org, mark.rutland@arm.com,
alex.williamson@redhat.com, kevin.tian@intel.com,
yi.l.liu@intel.com, ardb@kernel.org, akpm@linux-foundation.org,
andreyknvl@gmail.com, wangjinchao@xfusion.com, gshan@redhat.com,
ricarkol@google.com, linux-mm@kvack.org, lpieralisi@kernel.org,
rananta@google.com, ryan.roberts@arm.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, kvmarm@lists.linux.dev,
mochs@nvidia.com, zhiw@nvidia.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v6 3/4] kvm: arm64: set io memory s2 pte as normalnc for vfio pci device
Date: Thu, 8 Feb 2024 13:26:52 +0000 [thread overview]
Message-ID: <ZcTWnDBfAtMriXqp@linux.dev> (raw)
In-Reply-To: <20240207204652.22954-4-ankita@nvidia.com>
On Thu, Feb 08, 2024 at 02:16:51AM +0530, ankita@nvidia.com wrote:
> @@ -1557,10 +1559,18 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
> if (exec_fault)
> prot |= KVM_PGTABLE_PROT_X;
>
> - if (device)
> - prot |= KVM_PGTABLE_PROT_DEVICE;
> - else if (cpus_have_final_cap(ARM64_HAS_CACHE_DIC))
> + if (device) {
> + /*
> + * To provide VM with the ability to get device IO memory
> + * with NormalNC property, map device MMIO as NormalNC in S2.
> + */
nit: the comment doesn't provide anything of value, the logic is rather
straightforward here.
> + if (vfio_allow_wc)
> + prot |= KVM_PGTABLE_PROT_NORMAL_NC;
> + else
> + prot |= KVM_PGTABLE_PROT_DEVICE;
> + } else if (cpus_have_final_cap(ARM64_HAS_CACHE_DIC)) {
> prot |= KVM_PGTABLE_PROT_X;
> + }
>
> /*
> * Under the premise of getting a FSC_PERM fault, we just need to relax
> --
> 2.34.1
>
--
Thanks,
Oliver
next prev parent reply other threads:[~2024-02-08 13:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-07 20:46 [PATCH v6 0/4] kvm: arm64: allow the VM to select DEVICE_* and NORMAL_NC for IO memory ankita
2024-02-07 20:46 ` [PATCH v6 1/4] kvm: arm64: introduce new flag for non-cacheable " ankita
2024-02-08 13:00 ` Catalin Marinas
2024-02-08 13:24 ` Oliver Upton
2024-02-09 14:10 ` Ankit Agrawal
2024-02-08 13:19 ` Will Deacon
2024-02-09 14:12 ` Ankit Agrawal
2024-02-07 20:46 ` [PATCH v6 2/4] mm: introduce new flag to indicate wc safe ankita
2024-02-08 13:03 ` Catalin Marinas
2024-02-08 14:34 ` Jason Gunthorpe
2024-02-07 20:46 ` [PATCH v6 3/4] kvm: arm64: set io memory s2 pte as normalnc for vfio pci device ankita
2024-02-08 13:26 ` Oliver Upton [this message]
2024-02-08 14:51 ` Catalin Marinas
2024-02-09 14:05 ` Ankit Agrawal
2024-02-07 20:46 ` [PATCH v6 4/4] vfio: convey kvm that the vfio-pci device is wc safe ankita
2024-02-08 14:53 ` Catalin Marinas
2024-02-08 17:30 ` Alex Williamson
2024-02-08 17:54 ` Jason Gunthorpe
2024-02-09 14:02 ` Ankit Agrawal
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