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AJvYcCXc0PG26JKGbMK8LvxOXJUJGFVTEJ+2BvztGcS5ykpiqz5+k1Eps1kVkhuZJUhR8JBJYSfyAESIdQ==@kvack.org X-Gm-Message-State: AOJu0Yx1VEoDDtHkRHWt/qUZgSaFKXJ/8lvsuOlVdi2TgNVg10mv5mTF Z0BkyEMpn0jPIEK/5ItVxqIP/1CcXfL4boFOA30TDgdIOkrctTXhtDVW775MdOMR8fM0DLgOkA= = X-Google-Smtp-Source: AGHT+IFJlj4nTok+ueA0jACRwns8uL5LH08IddJBcx9wqowAWc71zjFE+8nTZuhjVvmJcfe8xTEJ+RPsaQ== X-Received: from wmsp15.prod.google.com ([2002:a05:600c:1d8f:b0:43c:ec4d:6037]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:4fce:b0:43b:cd0d:9466 with SMTP id 5b1f17b1804b1-43d07fd485emr45933555e9.9.1741802317784; Wed, 12 Mar 2025 10:58:37 -0700 (PDT) Date: Wed, 12 Mar 2025 17:58:19 +0000 In-Reply-To: <20250312175824.1809636-1-tabba@google.com> Mime-Version: 1.0 References: <20250312175824.1809636-1-tabba@google.com> X-Mailer: git-send-email 2.49.0.rc0.332.g42c0ae87b1-goog Message-ID: <20250312175824.1809636-7-tabba@google.com> Subject: [PATCH v6 06/10] KVM: x86: Mark KVM_X86_SW_PROTECTED_VM as supporting guest_memfd shared memory From: Fuad Tabba To: 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, david@redhat.com, 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, tabba@google.com X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 180C5180007 X-Stat-Signature: c13pjwh5jd3x6wzwhcgcjo5qaaozb33y X-HE-Tag: 1741802318-486293 X-HE-Meta: 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 C6LSrvTd 2dHNVNTT8ZGfbJTKxFSTNI72uovUWgod1L8S/drmlFiHASb/01ye9v1LDnUi552xowGGoCUtnU9Nw1EnfO/fMJ/m407q1XDqa2qCxO1RmjfPPPa0uE4/ORPsGNsd9usvZh2BUd3giJvU1Rlu2t6YNrVk6HBt4B3NueWAy2olGAXexqLG2v/59VeFk67nbEmfpeCeX8Lxtc8bSC6bQ3/DzusYn6JoDhySHzYCbExxhU7K5rg9lfmR6F39cSjqtac47VjfYD2wM+tXLjuObN2BjvZ+uzsAZ7FZhE/4oeaBDNr92TfqRiaLX2lNPnAK3YgyVvEjNI2FZtMaOKha6bxcSn10HUaJw7cSQa52Nag7COJzj3ZU= 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: The KVM_X86_SW_PROTECTED_VM type is meant for experimentation and does not have any underlying support for protected guests. This makes it a good candidate for testing mapping shared memory. Therefore, when the kconfig option is enabled, mark KVM_X86_SW_PROTECTED_VM as supporting shared memory. This means that this memory is considered by guest_memfd to be shared with the host, with the possibility of in-place conversion between shared and private. This allows the host to map and fault in guest_memfd memory belonging to this VM type. Signed-off-by: Fuad Tabba --- arch/x86/include/asm/kvm_host.h | 5 +++++ arch/x86/kvm/Kconfig | 3 ++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 32ae3aa50c7e..b874e54a5ee4 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -2246,8 +2246,13 @@ void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level, #ifdef CONFIG_KVM_PRIVATE_MEM #define kvm_arch_has_private_mem(kvm) ((kvm)->arch.has_private_mem) + +#define kvm_arch_gmem_supports_shared_mem(kvm) \ + (IS_ENABLED(CONFIG_KVM_GMEM_SHARED_MEM) && \ + ((kvm)->arch.vm_type == KVM_X86_SW_PROTECTED_VM)) #else #define kvm_arch_has_private_mem(kvm) false +#define kvm_arch_gmem_supports_shared_mem(kvm) false #endif #define kvm_arch_has_readonly_mem(kvm) (!(kvm)->arch.has_protected_state) diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index ea2c4f21c1ca..22d1bcdaad58 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -45,7 +45,8 @@ config KVM_X86 select HAVE_KVM_PM_NOTIFIER if PM select KVM_GENERIC_HARDWARE_ENABLING select KVM_GENERIC_PRE_FAULT_MEMORY - select KVM_GENERIC_PRIVATE_MEM if KVM_SW_PROTECTED_VM + select KVM_PRIVATE_MEM if KVM_SW_PROTECTED_VM + select KVM_GMEM_SHARED_MEM if KVM_SW_PROTECTED_VM select KVM_WERROR if WERROR config KVM