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AJvYcCVm2lPBQCiVlLJmU3gYa5YMkhTlVfGhnsJ9UXPrRhwVbSjsASV05994okRI3FrPlCPuL9/eoBKK/Q==@kvack.org X-Gm-Message-State: AOJu0YzsQ+29rom7mfG0a7OVd8W+iwttqBx/lyPOXxexHBmjYYobhsBA wi19Nttq1jD4xTssAD27jMrCYPQpg/+MxOJFXnjyvL+VDwEYW22UyT4Gqh9ajOsDeoFRAkrKhA= = X-Google-Smtp-Source: AGHT+IH7GwjRIYej47ad9eSczR4IN/8XTDl2Y0w5DE8LJkqljmss+RSdA/meE0fu/iiOZNhdn1995hFeMQ== X-Received: from wmbep11.prod.google.com ([2002:a05:600c:840b:b0:43b:c7e5:66e0]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:1c12:b0:43d:4686:5cfb with SMTP id 5b1f17b1804b1-441b1f5fc52mr33367835e9.27.1746032242127; Wed, 30 Apr 2025 09:57:22 -0700 (PDT) Date: Wed, 30 Apr 2025 17:56:54 +0100 In-Reply-To: <20250430165655.605595-1-tabba@google.com> Mime-Version: 1.0 References: <20250430165655.605595-1-tabba@google.com> X-Mailer: git-send-email 2.49.0.967.g6a0df3ecc3-goog Message-ID: <20250430165655.605595-13-tabba@google.com> Subject: [PATCH v8 12/13] KVM: x86: KVM_X86_SW_PROTECTED_VM to support 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, pankaj.gupta@amd.com, tabba@google.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 8A105140008 X-Stat-Signature: kdt6swf8c8nqphg964jakxjm8xuer5cs X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1746032243-737007 X-HE-Meta: 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 UjIlJeMD Z+PsSAnGh3CsCJnC2e2IZj834liIN+xTEYdf08i1cvIPdZ+QQ/cQtiwZ0ogT0KJCglDTeJbcAFLqBHpeNFdEnTKibfO/GgnhSUCIg47ijnfBOONIRUAnI8Fgi/jU/JfCVrijKP68rV5hngNMI+9lu5X0Hof82NUr1Wu92ESG5AQka//8r6MwNZSBBHbec35PIyFAy2T8FHNYcZ+ETTTzeDLsNUhOx9/PBWs4mVIdZFJRZN0LsxrKMXn9zqHWrwcKEaYwCH2LJYZSHokBjvZ5Kugr4goZgbdrhTujOddRBx/OwAfUv/MzK9+0wPbwnNNPwnQcqqItFOGKAlS/pNjax4SRp4ystroDNe5e+0tUqBxXEF041F6UKX9CvANsrcXX/6e/UNURrpfdijo0FJ87sC1u7BkqDHOOUofwrLdbtX/iXJrIqEXDTgKaFPoMy5Eod6aiNHwmMkDIn0FIvOsjxSfJy8CZisoPyN/G19y741JYid8YbziFts2Xa/HGl3hBBdMywINC1ALRtv+gVAchCnAL4qOqgGQOViABoOP6ArsnBxfTa5skdNBgqOvTPSFoYukhcXqs3g64ZSU4urDzEbdb3rty+1K2KtgSvHQSX6RdmKmMTrPFoNpwpoBYTmZc3xb4dr1/NWt4gIKkdX6hJEBTJdw== 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 underlying support for protected guests. This makes it a good candidate for testing mapping shared memory. Therefore, only when the kconfig option for in-place shared memory is enabled (KVM_GMEM_SHARED_MEM), mark this type as supporting shared memory. This means that this memory is considered by guest_memfd to be shared with the host, which is now able 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 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 709cc2a7ba66..1858dde449c3 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -2255,8 +2255,13 @@ void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level, #ifdef CONFIG_KVM_GMEM #define kvm_arch_supports_gmem(kvm) ((kvm)->arch.supports_gmem) + +#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_supports_gmem(kvm) false +#define kvm_arch_gmem_supports_shared_mem(kvm) false #endif #define kvm_arch_has_readonly_mem(kvm) (!(kvm)->arch.has_protected_state) -- 2.49.0.901.g37484f566f-goog