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Tue, 22 Sep 2020 13:49:13 -0700 (PDT) From: David Brazdil To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v4 00/10] Independent per-CPU data section for nVHE Date: Tue, 22 Sep 2020 21:49:00 +0100 Message-Id: <20200922204910.7265-1-dbrazdil@google.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200922_164917_138160_D3DB161F X-CRM114-Status: GOOD ( 17.38 ) X-Spam-Score: -15.7 (---------------) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-15.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:342 listed in] [list.dnswl.org] -7.5 USER_IN_DEF_SPF_WL From: address is in the default SPF white-list -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM white-list -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.5 ENV_AND_HDR_SPF_MATCH Env and Hdr From used in default SPF WL Match -0.0 DKIMWL_WL_MED DKIMwl.org - Medium trust sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kernel-team@android.com, Suzuki K Poulose , Catalin Marinas , linux-kernel@vger.kernel.org, James Morse , linux-arm-kernel@lists.infradead.org, Marc Zyngier , Tejun Heo , Dennis Zhou , Christoph Lameter , David Brazdil , Will Deacon , Julien Thierry Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Introduce '.hyp.data..percpu' as part of ongoing effort to make nVHE hyp code self-contained and independent of the rest of the kernel. Main benefits: * independent nVHE per-CPU data section that can be unmapped from host, * more robust linking of nVHE hyp code, * no need for hyp-specific macros to access per-CPU variables. The series is structured as follows: - patch 1: Improve existing hyp build rules. This could be sent and merged independently of per-CPU but this series builds on it. - patches 2-3: Minor cleanups. - patches 4-5: Replace hyp helpers for accessing per-CPU variables with common helpers modified to work correctly in hyp. Per-CPU variables can now be accessed with one API anywhere. - patches 6-8: Where VHE and nVHE use per-CPU variables defined in kernel proper, move their definitions to hyp/ where they are duplicated and owned by VHE/nVHE, respectively. Non-VHE hyp code now refers only to per-CPU variables defined in its source files. Helpers are added so that kernel proper can continue to access nVHE hyp variables, same way as it does with other nVHE symbols. - patches 9-10: Introduce '.hyp.data..percpu' ELF section and allocate memory for every CPU core during KVM init. All nVHE per-CPU state is now grouped together in ELF and in memory. Introducing a new per-CPU variable does not require adding new memory mappings any more. nVHE hyp code cannot accidentally refer to kernel-proper per-CPU data as it only has the pointer to its own per-CPU memory. Patches are rebased on v5.9-rc6 and available in branch 'topic/percpu-v4' at: https://android-kvm.googlesource.com/linux For maintainers: In case of interest, there are patches that remove the need for redefining macros under DEBUG_PREEMPT available at the same repo, branch 'topic/percpu-v3-debug-preempt'. Since they are non-trivial, I am not going to post them here so late in the 5.10 window. I plan to post them for 5.11 when they will also be useful for other patches. Changes v3 -> v4: * Drop patch that marked pages allocated for hyp reserved * Copy arm64_ssbd_callback_required at cpu_init_hyp_mode * Use read_sysreg in __hyp_my_cpu_offset * Simplify per-CPU region allocation code * Use same subsection name regex as other kernel linker scripts * Rename helper per-CPU macros * Add .gitignore for hyp linker script Changes v2 -> v3: * Use PERCPU_INPUT in hyp.ld instead of modifying PERCPU_SECTION * Only pass linker script once to LD (fix error message) * Renamed '.hyp.o' to '.nvhe.o' * Use __KVM_VHE_HYPERVISOR__ to select TPIDR_EL2 instead of alternatives * Move all prefixing-related macros to hyp_image.h Changes v1 -> v2: * partially link hyp code, add linker script David Brazdil (10): kvm: arm64: Partially link nVHE hyp code, simplify HYPCOPY kvm: arm64: Move nVHE hyp namespace macros to hyp_image.h kvm: arm64: Only define __kvm_ex_table for CONFIG_KVM kvm: arm64: Remove __hyp_this_cpu_read kvm: arm64: Remove hyp_adr/ldr_this_cpu kvm: arm64: Add helpers for accessing nVHE hyp per-cpu vars kvm: arm64: Duplicate arm64_ssbd_callback_required for nVHE hyp kvm: arm64: Create separate instances of kvm_host_data for VHE/nVHE kvm: arm64: Set up hyp percpu data for nVHE kvm: arm64: Remove unnecessary hyp mappings arch/arm64/include/asm/assembler.h | 29 +++++--- arch/arm64/include/asm/hyp_image.h | 36 ++++++++++ arch/arm64/include/asm/kvm_asm.h | 82 +++++++++++------------ arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/include/asm/kvm_mmu.h | 22 ++---- arch/arm64/include/asm/percpu.h | 28 +++++++- arch/arm64/kernel/image-vars.h | 4 -- arch/arm64/kernel/vmlinux.lds.S | 13 ++++ arch/arm64/kvm/arm.c | 61 +++++++++++++---- arch/arm64/kvm/hyp/hyp-entry.S | 2 +- arch/arm64/kvm/hyp/include/hyp/debug-sr.h | 4 +- arch/arm64/kvm/hyp/include/hyp/switch.h | 8 +-- arch/arm64/kvm/hyp/nvhe/.gitignore | 2 + arch/arm64/kvm/hyp/nvhe/Makefile | 60 +++++++++-------- arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 19 ++++++ arch/arm64/kvm/hyp/nvhe/switch.c | 8 ++- arch/arm64/kvm/hyp/vhe/switch.c | 5 +- arch/arm64/kvm/hyp/vhe/sysreg-sr.c | 4 +- arch/arm64/kvm/pmu.c | 13 ++-- 19 files changed, 272 insertions(+), 130 deletions(-) create mode 100644 arch/arm64/include/asm/hyp_image.h create mode 100644 arch/arm64/kvm/hyp/nvhe/.gitignore create mode 100644 arch/arm64/kvm/hyp/nvhe/hyp.lds.S --- 2.28.0.681.g6f77f65b4e-goog