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[2003:d8:2f25:9c00:e2c7:6eb5:8a51:1c60]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a35ca5a5b4sm18981429f8f.21.2025.05.21.03.26.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 May 2025 03:26:25 -0700 (PDT) Message-ID: Date: Wed, 21 May 2025 12:26:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 14/17] KVM: arm64: Enable mapping guest_memfd in arm64 To: Fuad Tabba Cc: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com References: <20250513163438.3942405-1-tabba@google.com> <20250513163438.3942405-15-tabba@google.com> <2084504e-2a11-404a-bbe8-930384106f53@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: yg5tdgtgzdq5qbfqwtxz6xowd3tc1o9c X-Rspamd-Queue-Id: E21E11C0002 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1747823191-806551 X-HE-Meta: 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 4B3c4BYP hceaKyTx2seL1Iny70DNAYj5JWhka0hzuvPaPQDW/L5ng5XFyDlBxz5lyNGdzJS11vn8cogct43nWkyQX3kllxOVecjyaxNLPOU4+/thEmhKbsQ9MuApGKxavKuhEuW1sdS8tgqi9vam9x58o7Qlk0mlVvsHuJnUgUFx9qyaxOr1Fe3PRLSdWSLaQRrQsStGV4dyi X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 21.05.25 12:12, Fuad Tabba wrote: > Hi David, > > On Wed, 21 May 2025 at 09:05, David Hildenbrand wrote: >> >> On 13.05.25 18:34, Fuad Tabba wrote: >>> Enable mapping guest_memfd in arm64. For now, it applies to all >>> VMs in arm64 that use guest_memfd. In the future, new VM types >>> can restrict this via kvm_arch_gmem_supports_shared_mem(). >>> >>> Signed-off-by: Fuad Tabba >>> --- >>> arch/arm64/include/asm/kvm_host.h | 10 ++++++++++ >>> arch/arm64/kvm/Kconfig | 1 + >>> 2 files changed, 11 insertions(+) >>> >>> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h >>> index 08ba91e6fb03..2514779f5131 100644 >>> --- a/arch/arm64/include/asm/kvm_host.h >>> +++ b/arch/arm64/include/asm/kvm_host.h >>> @@ -1593,4 +1593,14 @@ static inline bool kvm_arch_has_irq_bypass(void) >>> return true; >>> } >>> >>> +static inline bool kvm_arch_supports_gmem(struct kvm *kvm) >>> +{ >>> + return IS_ENABLED(CONFIG_KVM_GMEM); >>> +} >>> + >>> +static inline bool kvm_arch_vm_supports_gmem_shared_mem(struct kvm *kvm) >>> +{ >>> + return IS_ENABLED(CONFIG_KVM_GMEM_SHARED_MEM); >>> +} >>> + >>> #endif /* __ARM64_KVM_HOST_H__ */ >>> diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig >>> index 096e45acadb2..8c1e1964b46a 100644 >>> --- a/arch/arm64/kvm/Kconfig >>> +++ b/arch/arm64/kvm/Kconfig >>> @@ -38,6 +38,7 @@ menuconfig KVM >>> select HAVE_KVM_VCPU_RUN_PID_CHANGE >>> select SCHED_INFO >>> select GUEST_PERF_EVENTS if PERF_EVENTS >>> + select KVM_GMEM_SHARED_MEM >>> help >>> Support hosting virtualized guest machines. >>> >> >> Do we have to reject somewhere if we are given a guest_memfd that was >> *not* created using the SHARED flag? Or will existing checks already >> reject that? > > We don't reject, but I don't think we need to. A user can create a > guest_memfd that's private in arm64, it would just be useless. But the arm64 fault routine would not be able to handle that properly, no? -- Cheers, David / dhildenb