The series adds support for ARM64 to mshv_vtl driver. For this, common Hyper-V code is refactored, necessary support is added, mshv_vtl_main.c is refactored and then finally support is added in Kconfig.
Changes since v1: https://lore.kernel.org/all/[email protected]/ Patch 1: arm64: smp: Export arch_smp_send_reschedule for mshv_vtl module * Changed prefix in subject (Michael) * Sashiko - no issues Patch 2: * Add #include <linux/io.h> in hv_common.c (Michael) * Remove ms_hyperv.hints change from non TDX case, as it won't matter in failure case (Michael) * Add ms_hyperv.hints &= ~HV_X64_ENLIGHTENED_VMCS_RECOMMENDED for TDX case, to maintain parity with existing code. (Sashiko) * Handle synic_eventring_tail -ENOMEM issue by returning early (Michael|Sashiko) * Only 4k page is used here, so add dependency on PAGE_SIZE_4KB for MSHV_VTL as well in a later Kconfig patch (Sashiko|Michael) * Use HV_HYP_PAGE_SIZE instead of PAGE_SIZE to avoid page size mismatch issues (Sashiko) * s/"vmalloc_to_pfn(*hvp)"/ "page_to_hvpfn(vmalloc_to_page(*hvp))" in hv_common.c (Sashiko|Michael) * s/GFP_KERNEL/flags in __vmalloc. (Sashiko|Michael) * Limit code to 80 lines in hv_common_cpu_init (Mukesh R.) * Move arch based definition of HV_VP_ASSIST_PAGE_ADDRESS_SHIFT to hvgdk_mini.h (Michael) * Added a comment about x64 vmalloc_to_pfn(*hvp)) (Michael) * Move remaining hv_vp_assist_page code from arch/x86/include/asm/mshyperv.h to include/asm-generic/mshyperv.h (Michael) * s/HV_SYN_REG_VP_ASSIST_PAGE/HV_MSR_VP_ASSIST_PAGE (Michael) Patch 3: * Rework the code and remove these new APIs. Move the vmbus_handler global variable and hv_setup_vmbus_handler()/hv_remove_vmbus_handler() from arch/x86 to drivers/hv/hv_common.c so that the same APIs can be used to setup per-cpu vmbus handlers as well for arm64. (Michael) Patch 4: * Sashiko's comments are generic and outside the scope of the refactoring this patch is doing. Will take it up separately. Patch 6: * Sashiko's comment regarding race condition is false positive. * Regarding memory leak on cpu offline - online - beyond the scope of this series, I will fix it separately. Patch 7: * Subject s/"arch: arm64:"/"arm64: hyperv:" (Michael) * Changed commit msg as per Michael's suggestion * Add kernel_neon_begin(), kernel_neon_end() calls (Sashiko) * Removed Note prefix from comments (Michael) * Added compile time check for cpu context to be within 1024 bytes of mshv_vtl_run * Moved the declarations of mshv_vtl_return_call to generic file Patch 8: * Split the patch into three patches - number 8-10 (Michael) * Moved hv_vtl_configure_reg_page declaration to asm-generic header * Sashiko's other reviews are for existing code, I will take them separately Patch 9: (now patch 11) No changes required for Sashiko's comments as most of such controls are intentionally designated to OpenVMM to keep kernel driver simpler. Patch 10: (now patch 13) * Remove hv_setup_percpu_vmbus_handler invocations, after redesign in previous patchsets (Michael) * Simplified mshv_vtl_get_vsm_regs() by moving arch specific code (for x86) to hv_vtl - mshv_vtl_return_call_init(). This removes arch checks in mshv_vtl driver. Add a separate patch for this (now patch 12) * Other Sachiko's reviews are related to existing code - can be taken up separately Patch 11 (now patch 15): * Only 4k page is supported, so add dependency on PAGE_SIZE_4KB for MSHV_VTL (Sashiko|Mihael) * Remove "Kconfig: " from subject line. (Michael) New patch 14: Add a Kconfig dependency on 4K PAGE_SIZE for MSHV_VTL to manage assumptions in MSHV_VTL driver Change prefix in subjects as per below naming convention: mshv_vtl_main changes - "mshv_vtl: " arch/arm64 Hyper-V changes - "arm64: hyperv: " arch/x86 Hyper-V changes - "x86/hyperv: " Add Reviewed-by on already reviewed patches. Naman Jain (15): arm64: smp: Export arch_smp_send_reschedule for mshv_vtl module Drivers: hv: Move hv_vp_assist_page to common files Drivers: hv: Move vmbus_handler to common code mshv_vtl: Refactor the driver for ARM64 support to be added Drivers: hv: Export vmbus_interrupt for mshv_vtl module mshv_vtl: Make sint vector architecture neutral arm64: hyperv: Add support for mshv_vtl_return_call Drivers: hv: Move hv_call_(get|set)_vp_registers() declarations Drivers: hv: mshv_vtl: Move hv_vtl_configure_reg_page() to x86 arm64: hyperv: Add hv_vtl_configure_reg_page() stub mshv_vtl: Let userspace do VSM configuration mshv_vtl: Move VSM code page offset logic to x86 files mshv_vtl: Add remaining support for arm64 Drivers: hv: Add 4K page dependency in MSHV_VTL Drivers: hv: Add ARM64 support for MSHV_VTL in Kconfig arch/arm64/hyperv/Makefile | 1 + arch/arm64/hyperv/hv_vtl.c | 165 ++++++++++++++++++++++++ arch/arm64/include/asm/mshyperv.h | 25 ++++ arch/arm64/kernel/smp.c | 1 + arch/x86/hyperv/hv_init.c | 88 +------------ arch/x86/hyperv/hv_vtl.c | 149 ++++++++++++++++++++- arch/x86/include/asm/mshyperv.h | 21 +-- arch/x86/kernel/cpu/mshyperv.c | 12 -- drivers/hv/Kconfig | 7 +- drivers/hv/hv_common.c | 103 ++++++++++++++- drivers/hv/mshv.h | 8 -- drivers/hv/mshv_vtl.h | 3 + drivers/hv/mshv_vtl_main.c | 208 +++--------------------------- drivers/hv/vmbus_drv.c | 18 +-- include/asm-generic/mshyperv.h | 62 +++++++++ include/hyperv/hvgdk_mini.h | 6 +- 16 files changed, 550 insertions(+), 327 deletions(-) create mode 100644 arch/arm64/hyperv/hv_vtl.c -- 2.43.0
