From: Catalin Marinas <catalin.marinas@arm.com>
To: ankita@nvidia.com
Cc: jgg@nvidia.com, maz@kernel.org, oliver.upton@linux.dev,
james.morse@arm.com, suzuki.poulose@arm.com,
yuzenghui@huawei.com, reinette.chatre@intel.com,
surenb@google.com, stefanha@redhat.com, brauner@kernel.org,
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 1/4] kvm: arm64: introduce new flag for non-cacheable IO memory
Date: Thu, 8 Feb 2024 13:00:59 +0000 [thread overview]
Message-ID: <ZcTQi0wWZgvl05LB@arm.com> (raw)
In-Reply-To: <20240207204652.22954-2-ankita@nvidia.com>
On Thu, Feb 08, 2024 at 02:16:49AM +0530, ankita@nvidia.com wrote:
> diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> index c651df904fe3..2a893724ee9b 100644
> --- a/arch/arm64/kvm/hyp/pgtable.c
> +++ b/arch/arm64/kvm/hyp/pgtable.c
> @@ -717,15 +717,28 @@ void kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu,
> static int stage2_set_prot_attr(struct kvm_pgtable *pgt, enum kvm_pgtable_prot prot,
> kvm_pte_t *ptep)
> {
> - bool device = prot & KVM_PGTABLE_PROT_DEVICE;
> - kvm_pte_t attr = device ? KVM_S2_MEMATTR(pgt, DEVICE_nGnRE) :
> - KVM_S2_MEMATTR(pgt, NORMAL);
> + kvm_pte_t attr;
> u32 sh = KVM_PTE_LEAF_ATTR_LO_S2_SH_IS;
>
> + switch (prot & (KVM_PGTABLE_PROT_DEVICE |
> + KVM_PGTABLE_PROT_NORMAL_NC)) {
> + case 0:
> + attr = KVM_S2_MEMATTR(pgt, NORMAL);
> + break;
> + case KVM_PGTABLE_PROT_DEVICE:
> + if (prot & KVM_PGTABLE_PROT_X)
> + return -EINVAL;
> + attr = KVM_S2_MEMATTR(pgt, DEVICE_nGnRE);
> + break;
> + case KVM_PGTABLE_PROT_NORMAL_NC:
> + attr = KVM_S2_MEMATTR(pgt, NORMAL_NC);
> + break;
Does it make sense to allow executable here as well? I don't think it's
harmful but not sure there's a use-case for it either.
> + default:
> + WARN_ON_ONCE(1);
Return -EINVAL?
--
Catalin
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next prev parent reply other threads:[~2024-02-08 13:01 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 [this message]
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
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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