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[2003:d8:2f25:9c00:e2c7:6eb5:8a51:1c60]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a367205338sm15379116f8f.98.2025.05.21.01.05.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 May 2025 01:05:29 -0700 (PDT) Message-ID: <2084504e-2a11-404a-bbe8-930384106f53@redhat.com> Date: Wed, 21 May 2025 10:05:26 +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 , kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org Cc: 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> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: o9me47yjboyc6snyyecau9kutgjw9it7 X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CEA85180011 X-HE-Tag: 1747814733-491612 X-HE-Meta: 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 csqjzSLF 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 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 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? -- Cheers, David / dhildenb