From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Fuad Tabba <tabba@google.com>
Cc: Ackerley Tng <ackerleytng@google.com>,
kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-mm@kvack.org, kvmarm@lists.linux.dev, pbonzini@redhat.com,
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peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com
Subject: Re: [PATCH v14 04/21] KVM: x86: Introduce kvm->arch.supports_gmem
Date: Thu, 17 Jul 2025 17:00:03 +0800 [thread overview]
Message-ID: <dbf3313e-3328-485c-9a77-2f853ad22525@intel.com> (raw)
In-Reply-To: <CA+EHjTzZH2NN31ZfTg0NX_o3dryqbkmR4s8Y47eFJ1TcO1kiDA@mail.gmail.com>
On 7/17/2025 4:49 PM, Fuad Tabba wrote:
> On Thu, 17 Jul 2025 at 02:48, Xiaoyao Li<xiaoyao.li@intel.com> wrote:
>> On 7/17/2025 8:12 AM, Ackerley Tng wrote:
>>> Xiaoyao Li<xiaoyao.li@intel.com> writes:
>>>
...
>>>>
>>>> Btw, it seems that supports_gmem can be enabled for all the types of VM?
>>>>
>>> For now, not really, because supports_gmem allows mmap support, and mmap
>>> support enables KVM_MEMSLOT_GMEM_ONLY, and KVM_MEMSLOT_GMEM_ONLY will
>>> mean that shared faults also get faulted from guest_memfd.
>> No, mmap support is checked by kvm_arch_supports_gmem_mmap() which is
>> independent to whether gmem is supported.
> It is dependent on gmem support:
>
> kvm_arch_supports_gmem_mmap(kvm) depends on
> CONFIG_KVM_GMEM_SUPPORTS_MMAP, which in turn selects KVM_GMEM.
My bad that my words leads to misunderstanding.
What I wanted to express it that support_gmem doesn't mean mmap support
is allowed, there is additional specific guard for mmap support via
kvm_arch_supports_gmem_mmap().
next prev parent reply other threads:[~2025-07-17 9:00 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-15 9:33 [PATCH v14 00/21] KVM: Enable host userspace mapping for guest_memfd-backed memory for non-CoCo VMs Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 01/21] KVM: Rename CONFIG_KVM_PRIVATE_MEM to CONFIG_KVM_GMEM Fuad Tabba
2025-07-16 3:43 ` Xiaoyao Li
2025-07-15 9:33 ` [PATCH v14 02/21] KVM: Rename CONFIG_KVM_GENERIC_PRIVATE_MEM to CONFIG_KVM_GENERIC_GMEM_POPULATE Fuad Tabba
2025-07-16 4:08 ` Xiaoyao Li
2025-07-16 8:11 ` Fuad Tabba
2025-07-16 8:31 ` Xiaoyao Li
2025-07-16 10:25 ` David Hildenbrand
2025-07-16 11:02 ` Xiaoyao Li
2025-07-16 11:05 ` Fuad Tabba
2025-07-16 11:15 ` David Hildenbrand
2025-07-16 12:01 ` Xiaoyao Li
2025-07-16 12:13 ` Fuad Tabba
2025-07-16 12:14 ` David Hildenbrand
2025-07-16 12:24 ` Fuad Tabba
2025-07-16 12:39 ` Xiaoyao Li
2025-07-16 12:54 ` Fuad Tabba
2025-07-16 12:59 ` David Hildenbrand
2025-07-15 9:33 ` [PATCH v14 03/21] KVM: Introduce kvm_arch_supports_gmem() Fuad Tabba
2025-07-16 5:07 ` Xiaoyao Li
2025-07-15 9:33 ` [PATCH v14 04/21] KVM: x86: Introduce kvm->arch.supports_gmem Fuad Tabba
2025-07-16 5:18 ` Xiaoyao Li
2025-07-17 0:12 ` Ackerley Tng
2025-07-17 1:48 ` Xiaoyao Li
2025-07-17 8:49 ` Fuad Tabba
2025-07-17 9:00 ` Xiaoyao Li [this message]
2025-07-17 16:50 ` Ackerley Tng
2025-07-17 16:59 ` Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 05/21] KVM: Rename kvm_slot_can_be_private() to kvm_slot_has_gmem() Fuad Tabba
2025-07-16 5:19 ` Xiaoyao Li
2025-07-15 9:33 ` [PATCH v14 06/21] KVM: Fix comments that refer to slots_lock Fuad Tabba
2025-07-16 5:20 ` Xiaoyao Li
2025-07-15 9:33 ` [PATCH v14 07/21] KVM: Fix comment that refers to kvm uapi header path Fuad Tabba
2025-07-16 5:24 ` Xiaoyao Li
2025-07-15 9:33 ` [PATCH v14 08/21] KVM: guest_memfd: Allow host to map guest_memfd pages Fuad Tabba
2025-07-16 5:40 ` Xiaoyao Li
2025-07-16 8:15 ` Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 09/21] KVM: guest_memfd: Track guest_memfd mmap support in memslot Fuad Tabba
2025-07-16 6:10 ` Xiaoyao Li
2025-07-16 8:21 ` Fuad Tabba
2025-07-16 8:52 ` Xiaoyao Li
2025-07-16 10:31 ` David Hildenbrand
2025-07-16 10:59 ` Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 10/21] KVM: x86/mmu: Generalize private_max_mapping_level x86 op to max_mapping_level Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 11/21] KVM: x86/mmu: Allow NULL-able fault in kvm_max_private_mapping_level Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 12/21] KVM: x86/mmu: Consult guest_memfd when computing max_mapping_level Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 13/21] KVM: x86/mmu: Handle guest page faults for guest_memfd with shared memory Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 14/21] KVM: x86: Enable guest_memfd mmap for default VM type Fuad Tabba
2025-07-16 10:32 ` David Hildenbrand
2025-07-15 9:33 ` [PATCH v14 15/21] KVM: arm64: Refactor user_mem_abort() Fuad Tabba
2025-07-16 10:36 ` David Hildenbrand
2025-07-16 11:26 ` Fuad Tabba
2025-07-16 15:08 ` Marc Zyngier
2025-07-15 9:33 ` [PATCH v14 16/21] KVM: arm64: Handle guest_memfd-backed guest page faults Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 17/21] KVM: arm64: nv: Handle VNCR_EL2-triggered faults backed by guest_memfd Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 18/21] KVM: arm64: Enable host mapping of shared guest_memfd memory Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 19/21] KVM: Introduce the KVM capability KVM_CAP_GMEM_MMAP Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 20/21] KVM: selftests: Do not use hardcoded page sizes in guest_memfd test Fuad Tabba
2025-07-15 9:33 ` [PATCH v14 21/21] KVM: selftests: guest_memfd mmap() test when mmap is supported Fuad Tabba
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