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Sat, 17 Oct 2026 04:02:28 -0700 (PDT) Received: from x1c ([2405:9800:b670:b64b:7c65:ff3e:80ba:b06]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e97e804dd9sm20559955ad.16.2026.10.17.04.02.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Oct 2026 04:02:28 -0700 (PDT) From: Tharit Tangkijwanichakul To: Paolo Bonzini , Sean Christopherson Cc: Shuah Khan , Marc Zyngier , Oliver Upton , Fuad Tabba , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel-mentees@lists.linux.dev, skhan@linuxfoundation.org, me@brighamcampbell.com, jkoolstra@xs4all.nl, Tharit Tangkijwanichakul Subject: [PATCH 0/5] KVM: selftests: Reserve memslot 1 for ucall MMIO Date: Sat, 17 Oct 2026 18:02:08 +0700 Message-ID: <20261017110213.46199-1-tharitt97@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series addresses the TODO in __vm_create() to reserve memslot 1 for the ucall MMIO region. It introduces a shared base for test memslots, migrates existing test users, and adds a read-only region to prevent overlapping allocations. A regression test verifies overlap rejection and continued ucall operation. Testing: - Intel Core i5-10210U and Rockchip RK3588 (arm64). These tests are changed but not tested: - arm64/sea_to_user.c: not enough memory allocation. - x86/nested_vmsave_vmload_test.c: requires X86_FEATURE_SVM. - riscv/sbi_pmu_test.c: riscv hardware unavailability. The following test failures reproduce on both the unmodified base <8edffbc1f6272db167037e1a8c49b99e9cd04803> with host kernel 7.3.0-rc1-gd4b7fb647204 on RK3588 and with this series applied: - arm64/vgic_its_save.c - arm64/hypercalls.c These failures are unchanged by this series. Tharit Tangkijwanichakul (5): KVM: selftests: Introduce a shared base for test memslots KVM: selftests: Use the shared memslot base in memslot_perf_test KVM: selftests: Use the shared memslot base in memstress KVM: selftests: Reserve memslot 1 for the ucall MMIO address KVM: selftests: Test protection of the ucall MMIO region tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/arm64/hypercalls.c | 3 +- .../testing/selftests/kvm/arm64/sea_to_user.c | 2 +- .../kvm/arm64/stage2_block_transitions.c | 2 +- .../selftests/kvm/arm64/vgic_its_save.c | 2 +- .../selftests/kvm/arm64/vgic_lpi_stress.c | 2 +- tools/testing/selftests/kvm/dirty_log_test.c | 2 +- .../testing/selftests/kvm/guest_memfd_test.c | 2 +- .../testing/selftests/kvm/include/kvm_util.h | 1 + .../testing/selftests/kvm/include/memstress.h | 2 +- .../selftests/kvm/kvm_page_table_test.c | 2 +- tools/testing/selftests/kvm/lib/kvm_util.c | 19 ++++-- .../testing/selftests/kvm/memslot_perf_test.c | 62 +++++++++++-------- tools/testing/selftests/kvm/mmu_stress_test.c | 2 +- .../selftests/kvm/reserved_slot_test.c | 61 ++++++++++++++++++ .../selftests/kvm/riscv/sbi_pmu_test.c | 3 +- tools/testing/selftests/kvm/steal_time.c | 3 +- .../selftests/kvm/x86/nested_dirty_log_test.c | 2 +- .../kvm/x86/nested_vmsave_vmload_test.c | 2 +- 19 files changed, 128 insertions(+), 47 deletions(-) create mode 100644 tools/testing/selftests/kvm/reserved_slot_test.c -- 2.53.0