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AJvYcCWp2coRtG0QB5a6ME0jQro5sewIukEwseMpY3KNWM5cF/tDagDux6JFOkvZuQXTpZxRp1rSEMiyNyw5o7c=@vger.kernel.org X-Gm-Message-State: AOJu0YzWdB11d4+qiflkT1xnBaZ9iyR8bpe+1x3zv13thn4YfYId/KP2 Vf9JNjp6yrrsT+f823oNui0WMNHm+DFpnV+6GDtfXnWiEilA2dorRFgp8GOUHeokwAZvzamcZzK tCOoQ9lteplF51mYxLlNraTaiPw== X-Received: from pgli25.prod.google.com ([2002:a63:1319:0:b0:c6e:1869:6f24]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:9992:b0:398:a5c7:3dc9 with SMTP id adf61e73a8af0-39c87b6affdmr315892637.49.1774563901450; Thu, 26 Mar 2026 15:25:01 -0700 (PDT) Date: Thu, 26 Mar 2026 15:24:27 -0700 In-Reply-To: <20260326-gmem-inplace-conversion-v4-0-e202fe950ffd@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260326-gmem-inplace-conversion-v4-0-e202fe950ffd@google.com> X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Developer-Signature: v=1; a=ed25519-sha256; t=1774563861; l=2780; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=7TZkUYE885M/wXgOBZe37BZPynsdjK5T8U6+o9woLC4=; b=314JAxzEs6WcJiM6YyGFVmcscyTLi7cuvImPq+mUF9Ii+v6RmtfL08R7F3Q+0ERv7vn2+MJyY FZVNih8negYDvxZ4BfDeQXb+WPayqddg+asn8A0sbOoVY9TrZpWfcM2 X-Mailer: b4 0.14.3 Message-ID: <20260326-gmem-inplace-conversion-v4-18-e202fe950ffd@google.com> Subject: [PATCH RFC v4 18/44] KVM: selftests: Create gmem fd before "regular" fd when adding memslot From: Ackerley Tng To: aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, david@kernel.org, ira.weiny@intel.com, jmattson@google.com, jroedel@suse.de, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, tabba@google.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Jason Gunthorpe , Vlastimil Babka Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, Ackerley Tng Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Sean Christopherson When adding a memslot associated a guest_memfd instance, create/dup the guest_memfd before creating the "normal" backing file. This will allow dup'ing the gmem fd as the normal fd when guest_memfd supports mmap(), i.e. to make guest_memfd the _only_ backing source for the memslot. Signed-off-by: Sean Christopherson --- tools/testing/selftests/kvm/lib/kvm_util.c | 45 +++++++++++++++-----------= ---- 1 file changed, 23 insertions(+), 22 deletions(-) diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/sel= ftests/kvm/lib/kvm_util.c index 1959bf556e88e..610cb32ff207e 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -1061,6 +1061,29 @@ void vm_mem_add(struct kvm_vm *vm, enum vm_mem_backi= ng_src_type src_type, if (alignment > 1) region->mmap_size +=3D alignment; =20 + if (flags & KVM_MEM_GUEST_MEMFD) { + if (guest_memfd < 0) { + uint32_t guest_memfd_flags =3D 0; + + TEST_ASSERT(!guest_memfd_offset, + "Offset must be zero when creating new guest_memfd"); + guest_memfd =3D vm_create_guest_memfd(vm, mem_size, guest_memfd_flags); + } else { + /* + * Install a unique fd for each memslot so that the fd + * can be closed when the region is deleted without + * needing to track if the fd is owned by the framework + * or by the caller. + */ + guest_memfd =3D kvm_dup(guest_memfd); + } + + region->region.guest_memfd =3D guest_memfd; + region->region.guest_memfd_offset =3D guest_memfd_offset; + } else { + region->region.guest_memfd =3D -1; + } + region->fd =3D -1; if (backing_src_is_shared(src_type)) region->fd =3D kvm_memfd_alloc(region->mmap_size, @@ -1090,28 +1113,6 @@ void vm_mem_add(struct kvm_vm *vm, enum vm_mem_backi= ng_src_type src_type, =20 region->backing_src_type =3D src_type; =20 - if (flags & KVM_MEM_GUEST_MEMFD) { - if (guest_memfd < 0) { - uint32_t guest_memfd_flags =3D 0; - TEST_ASSERT(!guest_memfd_offset, - "Offset must be zero when creating new guest_memfd"); - guest_memfd =3D vm_create_guest_memfd(vm, mem_size, guest_memfd_flags); - } else { - /* - * Install a unique fd for each memslot so that the fd - * can be closed when the region is deleted without - * needing to track if the fd is owned by the framework - * or by the caller. - */ - guest_memfd =3D kvm_dup(guest_memfd); - } - - region->region.guest_memfd =3D guest_memfd; - region->region.guest_memfd_offset =3D guest_memfd_offset; - } else { - region->region.guest_memfd =3D -1; - } - region->unused_phy_pages =3D sparsebit_alloc(); if (vm_arch_has_protected_memory(vm)) region->protected_phy_pages =3D sparsebit_alloc(); --=20 2.53.0.1018.g2bb0e51243-goog