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Fri, 15 Jan 2021 12:19:14 +0000 From: Anup Patel To: Palmer Dabbelt , Palmer Dabbelt , Paul Walmsley , Albert Ou , Paolo Bonzini Cc: Alexander Graf , Atish Patra , Alistair Francis , Damien Le Moal , Anup Patel , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v16 00/17] KVM RISC-V Support Date: Fri, 15 Jan 2021 17:48:29 +0530 Message-Id: <20210115121846.114528-1-anup.patel@wdc.com> X-Mailer: git-send-email 2.25.1 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [122.167.152.18] X-ClientProxiedBy: MAXPR0101CA0024.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:c::34) To DM6PR04MB6201.namprd04.prod.outlook.com (2603:10b6:5:127::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from wdc.com (122.167.152.18) by MAXPR0101CA0024.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:c::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3763.10 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?aHDKcv9JeDh/0OjKEGm7JDLCIdZHg8Iv/DbdRTumGiamYZQHGVx9TFdxaWaT?= =?us-ascii?Q?yaD2oUq8r0DTk1wGmuGT5ENJlQGHXEyKlwcRf/tZK+JyH9xKQmh1xLSlWsaP?= =?us-ascii?Q?k1FORXcG8M5ITHcFf9+ImaXPmh5GCflGrb0xSVEcw+WP9NpRAruf8u5lUd+v?= =?us-ascii?Q?GGiBZri6yGV9Euxw6i3Eh7r0f8G3MWC8GMlVChC/dS9T08pyK/MsSJTWoVIm?= =?us-ascii?Q?zD4yhCQaGs65802RjMEGPnCaxPHN6KXXiCjvTNA3Hgxyv1T7qcLXD7vPM7jH?= =?us-ascii?Q?dwlp+CON1c/32P/Utem3xWekSeEElHLCF9/y6M1efirmCRsoRPH7OqQMoOXt?= =?us-ascii?Q?bOSVW9n9BVtYPco6uJbRq9p557x0w3FpHw0hPuGnDgjq18PqsldDWfC7U5s6?= =?us-ascii?Q?3J18oTBSg73K/jkBIwPRO1if0t2bBreVgqYrhA6BX2ZOo4R/6EANVl7U9DQO?= =?us-ascii?Q?qgubp3/vEmdVsMAmPDz450wSWrTnL3+7nRGXcgdjRLcVD/vg5bYNPLUM2olh?= =?us-ascii?Q?ZMMjEqX/dMj7kIQOzw5AaNNMoUNP7mU1kCgDyZ9YuWD95Ipl4FRLObilqS0u?= =?us-ascii?Q?Bu62qZy4y96GWzxju08ynbYhNbMkswoOa335mRn0RUvJS83OB3Psr1WhQJoF?= =?us-ascii?Q?gytHXMHJnnDDl5V7qtJZbr78QmZvjbZbGz/ojTkCLGl2VZec8b6pGLMjlZ7x?= =?us-ascii?Q?JiApyKbKu64bid1S5+09zfzKK1j7Nu4yZyZQFdUy+QiZeVMu7//wVUpUiZz0?= =?us-ascii?Q?klG/yHOMxoxFuJ/B6i0OGiawu4BwjfOuzouMZl4ZvWldayhZZoc+yDLvZEtB?= =?us-ascii?Q?vmaG2Gaw5g220sz3jBIcMti0DMZmmT+E4g+Eq9Bh4wV6TRzoiDOydrZEA3pC?= =?us-ascii?Q?5EiWiknywkwJSntMPo2HInvI4YaqOSCzLTDZsfSilAf83Dv2IwmNXHB9fh21?= =?us-ascii?Q?ByQUt2pwNf0Wky25FwliMlk2evFJNaKWbvE89TZhM3wytBHmgCkJHanl1fMK?= =?us-ascii?Q?w6vJ?= X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5515c33b-2d33-48af-2cc8-08d8b94fc5cb X-MS-Exchange-CrossTenant-AuthSource: DM6PR04MB6201.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jan 2021 12:19:14.7205 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: TrtqYvltyH+AVakmOzWBYG4RQ1/PDEo/cwqfI9/TtO6Syg0tgzbZreLhAqj8y33TMXfaRtG67oVtRecLC6aleg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR04MB3769 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series adds initial KVM RISC-V support. Currently, we are able to boot Linux on RV64/RV32 Guest with multiple VCPUs. Key aspects of KVM RISC-V added by this series are: 1. No RISC-V specific KVM IOCTL 2. Minimal possible KVM world-switch which touches only GPRs and few CSRs 3. Both RV64 and RV32 host supported 4. Full Guest/VM switch is done via vcpu_get/vcpu_put infrastructure 5. KVM ONE_REG interface for VCPU register access from user-space 6. PLIC emulation is done in user-space 7. Timer and IPI emuation is done in-kernel 8. Both Sv39x4 and Sv48x4 supported for RV64 host 9. MMU notifiers supported 10. Generic dirtylog supported 11. FP lazy save/restore supported 12. SBI v0.1 emulation for KVM Guest available 13. Forward unhandled SBI calls to KVM userspace 14. Hugepage support for Guest/VM 15. IOEVENTFD support for Vhost Here's a brief TODO list which we will work upon after this series: 1. SBI v0.2 emulation in-kernel 2. SBI v0.2 hart state management emulation in-kernel 3. In-kernel PLIC emulation 4. ..... and more ..... This series can be found in riscv_kvm_v16 branch at: https//github.com/avpatel/linux.git Our work-in-progress KVMTOOL RISC-V port can be found in riscv_v6 branch at: https//github.com/avpatel/kvmtool.git The QEMU RISC-V hypervisor emulation is done by Alistair and is available in master branch at: https://git.qemu.org/git/qemu.git To play around with KVM RISC-V, refer KVM RISC-V wiki at: https://github.com/kvm-riscv/howto/wiki https://github.com/kvm-riscv/howto/wiki/KVM-RISCV64-on-QEMU https://github.com/kvm-riscv/howto/wiki/KVM-RISCV64-on-Spike Changes since v15: - Rebased on Linux-5.11-rc3 - Fixed kvm_stage2_map() to use gfn_to_pfn_prot() for determing writeability of a host pfn. - Use "__u64" in-place of "u64" and "__u32" in-place of "u32" for uapi/asm/kvm.h Changes since v14: - Rebased on Linux-5.10-rc3 - Fixed Stage2 (G-stage) PDG allocation to ensure it is 16KB aligned Changes since v13: - Rebased on Linux-5.9-rc3 - Fixed kvm_riscv_vcpu_set_reg_csr() for SIP updation in PATCH5 - Fixed instruction length computation in PATCH7 - Added ioeventfd support in PATCH7 - Ensure HSTATUS.SPVP is set to correct value before using HLV/HSV intructions in PATCH7 - Fixed stage2_map_page() to set PTE 'A' and 'D' bits correctly in PATCH10 - Added stage2 dirty page logging in PATCH10 - Allow KVM user-space to SET/GET SCOUNTER CSR in PATCH5 - Save/restore SCOUNTEREN in PATCH6 - Reduced quite a few instructions for __kvm_riscv_switch_to() by using CSR swap instruction in PATCH6 - Detect and use Sv48x4 when available in PATCH10 Changes since v12: - Rebased patches on Linux-5.8-rc4 - By default enable all counters in HCOUNTEREN - RISC-V H-Extension v0.6.1 spec support Changes since v11: - Rebased patches on Linux-5.7-rc3 - Fixed typo in typecast of stage2_map_size define - Introduced struct kvm_cpu_trap to represent trap details and use it as function parameter wherever applicable - Pass memslot to kvm_riscv_stage2_map() for supporing dirty page logging in future - RISC-V H-Extension v0.6 spec support - Send-out first three patches as separate series so that it can be taken by Palmer for Linux RISC-V Changes since v10: - Rebased patches on Linux-5.6-rc5 - Reduce RISCV_ISA_EXT_MAX from 256 to 64 - Separate PATCH for removing N-extension related defines - Added comments as requested by Palmer - Fixed HIDELEG CSR programming Changes since v9: - Rebased patches on Linux-5.5-rc3 - Squash PATCH19 and PATCH20 into PATCH5 - Squash PATCH18 into PATCH11 - Squash PATCH17 into PATCH16 - Added ONE_REG interface for VCPU timer in PATCH13 - Use HTIMEDELTA for VCPU timer in PATCH13 - Updated KVM RISC-V mailing list in MAINTAINERS entry - Update KVM kconfig option to depend on RISCV_SBI and MMU - Check for SBI v0.2 and SBI v0.2 RFENCE extension at boot-time - Use SBI v0.2 RFENCE extension in VMID implementation - Use SBI v0.2 RFENCE extension in Stage2 MMU implementation - Use SBI v0.2 RFENCE extension in SBI implementation - Moved to RISC-V Hypervisor v0.5 draft spec - Updated Documentation/virt/kvm/api.txt for timer ONE_REG interface Changes since v8: - Rebased series on Linux-5.4-rc3 and Atish's SBI v0.2 patches - Use HRTIMER_MODE_REL instead of HRTIMER_MODE_ABS in timer emulation - Fixed kvm_riscv_stage2_map() to handle hugepages - Added patch to forward unhandled SBI calls to user-space - Added patch for iterative/recursive stage2 page table programming - Added patch to remove per-CPU vsip_shadow variable - Added patch to fix race-condition in kvm_riscv_vcpu_sync_interrupts() Changes since v7: - Rebased series on Linux-5.4-rc1 and Atish's SBI v0.2 patches - Removed PATCH1, PATCH3, and PATCH20 because these already merged - Use kernel doc style comments for ISA bitmap functions - Don't parse X, Y, and Z extension in riscv_fill_hwcap() because it will be added in-future - Mark KVM RISC-V kconfig option as EXPERIMENTAL - Typo fix in commit description of PATCH6 of v7 series - Use separate structs for CORE and CSR registers of ONE_REG interface - Explicitly include asm/sbi.h in kvm/vcpu_sbi.c - Removed implicit switch-case fall-through in kvm_riscv_vcpu_exit() - No need to set VSSTATUS.MXR bit in kvm_riscv_vcpu_unpriv_read() - Removed register for instruction length in kvm_riscv_vcpu_unpriv_read() - Added defines for checking/decoding instruction length - Added separate patch to forward unhandled SBI calls to userspace tool Changes since v6: - Rebased patches on Linux-5.3-rc7 - Added "return_handled" in struct kvm_mmio_decode to ensure that kvm_riscv_vcpu_mmio_return() updates SEPC only once - Removed trap_stval parameter from kvm_riscv_vcpu_unpriv_read() - Updated git repo URL in MAINTAINERS entry Changes since v5: - Renamed KVM_REG_RISCV_CONFIG_TIMEBASE register to KVM_REG_RISCV_CONFIG_TBFREQ register in ONE_REG interface - Update SPEC in kvm_riscv_vcpu_mmio_return() for MMIO exits - Use switch case instead of illegal instruction opcode table for simplicity - Improve comments in stage2_remote_tlb_flush() for a potential remote TLB flush optimization - Handle all unsupported SBI calls in default case of kvm_riscv_vcpu_sbi_ecall() function - Fixed kvm_riscv_vcpu_sync_interrupts() for software interrupts - Improved unprivilege reads to handle traps due to Guest stage1 page table - Added separate patch to document RISC-V specific things in Documentation/virt/kvm/api.txt Changes since v4: - Rebased patches on Linux-5.3-rc5 - Added Paolo's Acked-by and Reviewed-by - Updated mailing list in MAINTAINERS entry Changes since v3: - Moved patch for ISA bitmap from KVM prep series to this series - Make vsip_shadow as run-time percpu variable instead of compile-time - Flush Guest TLBs on all Host CPUs whenever we run-out of VMIDs Changes since v2: - Removed references of KVM_REQ_IRQ_PENDING from all patches - Use kvm->srcu within in-kernel KVM run loop - Added percpu vsip_shadow to track last value programmed in VSIP CSR - Added comments about irqs_pending and irqs_pending_mask - Used kvm_arch_vcpu_runnable() in-place-of kvm_riscv_vcpu_has_interrupt() in system_opcode_insn() - Removed unwanted smp_wmb() in kvm_riscv_stage2_vmid_update() - Use kvm_flush_remote_tlbs() in kvm_riscv_stage2_vmid_update() - Use READ_ONCE() in kvm_riscv_stage2_update_hgatp() for vmid Changes since v1: - Fixed compile errors in building KVM RISC-V as module - Removed unused kvm_riscv_halt_guest() and kvm_riscv_resume_guest() - Set KVM_CAP_SYNC_MMU capability only after MMU notifiers are implemented - Made vmid_version as unsigned long instead of atomic - Renamed KVM_REQ_UPDATE_PGTBL to KVM_REQ_UPDATE_HGATP - Renamed kvm_riscv_stage2_update_pgtbl() to kvm_riscv_stage2_update_hgatp() - Configure HIDELEG and HEDELEG in kvm_arch_hardware_enable() - Updated ONE_REG interface for CSR access to user-space - Removed irqs_pending_lock and use atomic bitops instead - Added separate patch for FP ONE_REG interface - Added separate patch for updating MAINTAINERS file Anup Patel (13): RISC-V: Add hypervisor extension related CSR defines RISC-V: Add initial skeletal KVM support RISC-V: KVM: Implement VCPU create, init and destroy functions RISC-V: KVM: Implement VCPU interrupts and requests handling RISC-V: KVM: Implement KVM_GET_ONE_REG/KVM_SET_ONE_REG ioctls RISC-V: KVM: Implement VCPU world-switch RISC-V: KVM: Handle MMIO exits for VCPU RISC-V: KVM: Handle WFI exits for VCPU RISC-V: KVM: Implement VMID allocator RISC-V: KVM: Implement stage2 page table programming RISC-V: KVM: Implement MMU notifiers RISC-V: KVM: Document RISC-V specific parts of KVM API RISC-V: KVM: Add MAINTAINERS entry Atish Patra (4): RISC-V: KVM: Add timer functionality RISC-V: KVM: FP lazy save/restore RISC-V: KVM: Implement ONE REG interface for FP registers RISC-V: KVM: Add SBI v0.1 support Documentation/virt/kvm/api.rst | 193 ++++- MAINTAINERS | 11 + arch/riscv/Kconfig | 1 + arch/riscv/Makefile | 2 + arch/riscv/include/asm/csr.h | 89 ++ arch/riscv/include/asm/kvm_host.h | 278 +++++++ arch/riscv/include/asm/kvm_types.h | 7 + arch/riscv/include/asm/kvm_vcpu_timer.h | 44 + arch/riscv/include/asm/pgtable-bits.h | 1 + arch/riscv/include/uapi/asm/kvm.h | 128 +++ arch/riscv/kernel/asm-offsets.c | 156 ++++ arch/riscv/kvm/Kconfig | 36 + arch/riscv/kvm/Makefile | 15 + arch/riscv/kvm/main.c | 118 +++ arch/riscv/kvm/mmu.c | 860 +++++++++++++++++++ arch/riscv/kvm/tlb.S | 74 ++ arch/riscv/kvm/vcpu.c | 1012 +++++++++++++++++++++++ arch/riscv/kvm/vcpu_exit.c | 701 ++++++++++++++++ arch/riscv/kvm/vcpu_sbi.c | 173 ++++ arch/riscv/kvm/vcpu_switch.S | 400 +++++++++ arch/riscv/kvm/vcpu_timer.c | 225 +++++ arch/riscv/kvm/vm.c | 81 ++ arch/riscv/kvm/vmid.c | 120 +++ drivers/clocksource/timer-riscv.c | 8 + include/clocksource/timer-riscv.h | 16 + include/uapi/linux/kvm.h | 8 + 26 files changed, 4748 insertions(+), 9 deletions(-) create mode 100644 arch/riscv/include/asm/kvm_host.h create mode 100644 arch/riscv/include/asm/kvm_types.h create mode 100644 arch/riscv/include/asm/kvm_vcpu_timer.h create mode 100644 arch/riscv/include/uapi/asm/kvm.h create mode 100644 arch/riscv/kvm/Kconfig create mode 100644 arch/riscv/kvm/Makefile create mode 100644 arch/riscv/kvm/main.c create mode 100644 arch/riscv/kvm/mmu.c create mode 100644 arch/riscv/kvm/tlb.S create mode 100644 arch/riscv/kvm/vcpu.c create mode 100644 arch/riscv/kvm/vcpu_exit.c create mode 100644 arch/riscv/kvm/vcpu_sbi.c create mode 100644 arch/riscv/kvm/vcpu_switch.S create mode 100644 arch/riscv/kvm/vcpu_timer.c create mode 100644 arch/riscv/kvm/vm.c create mode 100644 arch/riscv/kvm/vmid.c create mode 100644 include/clocksource/timer-riscv.h -- 2.25.1