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AJvYcCUHqn8PUk/Vy+oib/WZkQC6lNNIS5yFKfShKPyArC4SFwd5ZlgbV1t1SSS06CqzoKMR8Qal2mbsrg==@kvack.org X-Gm-Message-State: AOJu0YxHKsuapabp3b32EnAQMvNpz8/T2oxViyD4SfgvtUsCcKHRMtHG lte45Ts4J8Coxsb0DPNGJbiUmfSDyVV/bMlziu/RF+cdbVGl8D2+RhI9DB7xLmanTJrSeI7noA= = X-Google-Smtp-Source: AGHT+IEzzWpqEnLXSXMECYOpjexIXQkN5OcLraeoWVVOWbC+GmYVuhkSVhxjsVgVJQAszWAWjCT5GaMLGQ== X-Received: from wmqa13.prod.google.com ([2002:a05:600c:348d:b0:439:64f9:d801]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:1f89:b0:439:96b2:e8f with SMTP id 5b1f17b1804b1-43bb4550794mr52549605e9.28.1741021826102; Mon, 03 Mar 2025 09:10:26 -0800 (PST) Date: Mon, 3 Mar 2025 17:10:09 +0000 In-Reply-To: <20250303171013.3548775-1-tabba@google.com> Mime-Version: 1.0 References: <20250303171013.3548775-1-tabba@google.com> X-Mailer: git-send-email 2.48.1.711.g2feabab25a-goog Message-ID: <20250303171013.3548775-6-tabba@google.com> Subject: [PATCH v5 5/9] 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-Stat-Signature: bpoxwg9aqwh1z518sxx8eyxu1db3nqkn X-Rspamd-Queue-Id: 5FF671C0019 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1741021827-4717 X-HE-Meta: U2FsdGVkX186hAPjKn13nSRrB1wsv367tRPInZB1qwD5wNdpcaQo+OOAqmMwFZZvhN0auRn8TORDV6j2Lp/6CCQ1FIgTwMvEMKR/nG/CF0gubBPHyupxPi09op1XGXUg0Te94MErVV+A7PS6Y1E6r/m6tRudt9fM3eB9SHAZzlWNap4XWkcJwzIAcpXelZMqijFgY+fbqOGEr90jR7Fnd1RDL5JOWPATODJGQNDI1eNV9KtMBa7sTx8KxufeV3dfzDC6X8KF2E7O7OLfnE2bI1w91u/12zV5FlX/LWU4D2+Cm/PmTrZRJsaemUjocH6XvYLJvtB6WY34vP+xhRxUncF+e3JZEeN3h+dgzvJJCgFmRgyKga3GQuHmkmdx/59ANpm4ueC5crBuZ2j2WXn90V8+ir1jq7IsJHvz/i9BGsNtYbWxcdkvdZEsE5x/41sfCUiqyd7EigTpMLzg2StluHy5KLWD2eR6IQybueOubaHI8yo13Nutk+DU6SJalpDAhqZY7ckk8G7et0AIWrrc0tiSE6kQvbq2cIX23Lv5y3MF1ZS810ib8sN+EGmDbxupZ7Ixgh0OzbB3ozC4nd2Z5t3Ep2S7gmv+em/6qBaKhYf7kNHi7F80NmVLpFOGfmIwBJ3dwDDIpZ/DzVwI3q8CGEs0FuwvGseagtiUBqkX74zEXrawzpYDezdPH7kemPK50Vo3LewFePEoECyxeFAd/5nPMlok+zOJR2L6d/AmcGnU4VkPVmfKYH/dzSm7RtthwoZ0OI4uCpyPQKe4AEWUUNlYzEvt3DwfwkkmbVdzohV/wEel2C6U8VkFGDC1KAnvVT4Vzd7T1cBGTVaZFgRLr9NcHltpZ1YOUJn6R1aUGBCjxBVr7q31NvS2krd1eH6N6o9mO1x5uedvdd88QL6n2jZpkUqPfCkJHNyzgh8IdxldQX8TAJxdziE5ijdI4XwHjEzGh4tkNtyNry8dHZE gB8+wr2j 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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: 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 0b7af5902ff7..c6e4925bdc8a 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -2245,8 +2245,13 @@ 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