[v11,02/31] LoongArch: KVM: Implement kvm module related interface

Message ID	20230522031217.956464-3-zhaotianrui@loongson.cn (mailing list archive)
State	New, archived
Headers	show Return-Path: <kvm-owner@vger.kernel.org> From: Tianrui Zhao <zhaotianrui@loongson.cn> To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini <pbonzini@redhat.com>, Huacai Chen <chenhuacai@kernel.org>, WANG Xuerui <kernel@xen0n.name>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, loongarch@lists.linux.dev, Jens Axboe <axboe@kernel.dk>, Mark Brown <broonie@kernel.org>, Alex Deucher <alexander.deucher@amd.com>, Oliver Upton <oliver.upton@linux.dev>, maobibo@loongson.cn, Xi Ruoyao <xry111@xry111.site>, zhaotianrui@loongson.cn Subject: [PATCH v11 02/31] LoongArch: KVM: Implement kvm module related interface Date: Mon, 22 May 2023 11:11:48 +0800 Message-Id: <20230522031217.956464-3-zhaotianrui@loongson.cn> In-Reply-To: <20230522031217.956464-1-zhaotianrui@loongson.cn> References: <20230522031217.956464-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Add KVM LoongArch support \| expand [v11,00/31] Add KVM LoongArch support [v11,01/31] LoongArch: KVM: Add kvm related header files [v11,02/31] LoongArch: KVM: Implement kvm module related interface [v11,03/31] LoongArch: KVM: Implement kvm hardware enable, disable interface [v11,04/31] LoongArch: KVM: Implement VM related functions [v11,05/31] LoongArch: KVM: Add vcpu related header files [v11,06/31] LoongArch: KVM: Implement vcpu create and destroy interface [v11,07/31] LoongArch: KVM: Implement vcpu run interface [v11,08/31] LoongArch: KVM: Implement vcpu handle exit interface [v11,09/31] LoongArch: KVM: Implement vcpu get, vcpu set registers [v11,10/31] LoongArch: KVM: Implement vcpu ENABLE_CAP ioctl interface [v11,11/31] LoongArch: KVM: Implement fpu related operations for vcpu [v11,12/31] LoongArch: KVM: Implement vcpu interrupt operations [v11,13/31] LoongArch: KVM: Implement misc vcpu related interfaces [v11,14/31] LoongArch: KVM: Implement vcpu load and vcpu put operations [v11,15/31] LoongArch: KVM: Implement vcpu status description [v11,16/31] LoongArch: KVM: Implement update VM id function [v11,17/31] LoongArch: KVM: Implement virtual machine tlb operations [v11,18/31] LoongArch: KVM: Implement vcpu timer operations [v11,19/31] LoongArch: KVM: Implement kvm mmu operations [v11,20/31] LoongArch: KVM: Implement handle csr excption [v11,21/31] LoongArch: KVM: Implement handle iocsr exception [v11,22/31] LoongArch: KVM: Implement handle idle exception [v11,23/31] LoongArch: KVM: Implement handle gspr exception [v11,24/31] LoongArch: KVM: Implement handle mmio exception [v11,25/31] LoongArch: KVM: Implement handle fpu exception [v11,26/31] LoongArch: KVM: Implement kvm exception vector [v11,27/31] LoongArch: KVM: Implement vcpu world switch [v11,28/31] LoongArch: KVM: Implement probe virtualization when LoongArch cpu init [v11,29/31] LoongArch: KVM: Enable kvm config and add the makefile [v11,30/31] LoongArch: KVM: Supplement kvm document about LoongArch-specific part [v11,31/31] LoongArch: KVM: Add maintainers for LoongArch KVM

diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c new file mode 100644 index 000000000000..228d21dc40ae --- /dev/null +++ b/arch/loongarch/kvm/main.c @@ -0,0 +1,276 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/kvm_host.h> +#include <asm/cacheflush.h> + +static struct kvm_context __percpu *vmcs; +struct kvm_world_switch *kvm_loongarch_ops; +unsigned long vpid_mask; +static int gcsr_flag[CSR_MAX_NUMS]; + +int get_gcsr_flag(int csr) +{ + return gcsr_flag[csr]; +} + +static inline void set_gcsr_sw_flag(int csr) +{ + gcsr_flag[csr] |= SW_GCSR; +} + +static inline void set_gcsr_hw_flag(int csr) +{ + gcsr_flag[csr] |= HW_GCSR; +} + +/* + * The default value of gcsr_flag[CSR] is 0(INVALID_GCSR), and we use this + * function to set the flag to 1(SW_GCSR) or 2(HW_GCSR) if the gcsr is software + * or hardware. It will be used by get/set_gcsr, if gcsr_flag is HW we should + * use gcsrrd/gcsrwr to access it, else use sw csr to emulate it. + */ +static void _kvm_init_gcsr_flag(void) +{ + set_gcsr_hw_flag(LOONGARCH_CSR_CRMD); + set_gcsr_hw_flag(LOONGARCH_CSR_PRMD); + set_gcsr_hw_flag(LOONGARCH_CSR_EUEN); + set_gcsr_hw_flag(LOONGARCH_CSR_MISC); + set_gcsr_hw_flag(LOONGARCH_CSR_ECFG); + set_gcsr_hw_flag(LOONGARCH_CSR_ESTAT); + set_gcsr_hw_flag(LOONGARCH_CSR_ERA); + set_gcsr_hw_flag(LOONGARCH_CSR_BADV); + set_gcsr_hw_flag(LOONGARCH_CSR_BADI); + set_gcsr_hw_flag(LOONGARCH_CSR_EENTRY); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBIDX); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBEHI); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBELO0); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBELO1); + set_gcsr_hw_flag(LOONGARCH_CSR_ASID); + set_gcsr_hw_flag(LOONGARCH_CSR_PGDL); + set_gcsr_hw_flag(LOONGARCH_CSR_PGDH); + set_gcsr_hw_flag(LOONGARCH_CSR_PWCTL0); + set_gcsr_hw_flag(LOONGARCH_CSR_PWCTL1); + set_gcsr_hw_flag(LOONGARCH_CSR_STLBPGSIZE); + set_gcsr_hw_flag(LOONGARCH_CSR_RVACFG); + set_gcsr_hw_flag(LOONGARCH_CSR_CPUID); + set_gcsr_hw_flag(LOONGARCH_CSR_PRCFG1); + set_gcsr_hw_flag(LOONGARCH_CSR_PRCFG2); + set_gcsr_hw_flag(LOONGARCH_CSR_PRCFG3); + set_gcsr_hw_flag(LOONGARCH_CSR_KS0); + set_gcsr_hw_flag(LOONGARCH_CSR_KS1); + set_gcsr_hw_flag(LOONGARCH_CSR_KS2); + set_gcsr_hw_flag(LOONGARCH_CSR_KS3); + set_gcsr_hw_flag(LOONGARCH_CSR_KS4); + set_gcsr_hw_flag(LOONGARCH_CSR_KS5); + set_gcsr_hw_flag(LOONGARCH_CSR_KS6); + set_gcsr_hw_flag(LOONGARCH_CSR_KS7); + set_gcsr_hw_flag(LOONGARCH_CSR_TMID); + set_gcsr_hw_flag(LOONGARCH_CSR_TCFG); + set_gcsr_hw_flag(LOONGARCH_CSR_TVAL); + set_gcsr_hw_flag(LOONGARCH_CSR_CNTC); + set_gcsr_hw_flag(LOONGARCH_CSR_LLBCTL); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRENTRY); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRBADV); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRERA); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRSAVE); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRELO0); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRELO1); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBREHI); + set_gcsr_hw_flag(LOONGARCH_CSR_TLBRPRMD); + set_gcsr_hw_flag(LOONGARCH_CSR_DMWIN0); + set_gcsr_hw_flag(LOONGARCH_CSR_DMWIN1); + set_gcsr_hw_flag(LOONGARCH_CSR_DMWIN2); + set_gcsr_hw_flag(LOONGARCH_CSR_DMWIN3); + set_gcsr_hw_flag(LOONGARCH_CSR_MWPS); + set_gcsr_hw_flag(LOONGARCH_CSR_FWPS); + + set_gcsr_sw_flag(LOONGARCH_CSR_IMPCTL1); + set_gcsr_sw_flag(LOONGARCH_CSR_IMPCTL2); + set_gcsr_sw_flag(LOONGARCH_CSR_MERRCTL); + set_gcsr_sw_flag(LOONGARCH_CSR_MERRINFO1); + set_gcsr_sw_flag(LOONGARCH_CSR_MERRINFO2); + set_gcsr_sw_flag(LOONGARCH_CSR_MERRENTRY); + set_gcsr_sw_flag(LOONGARCH_CSR_MERRERA); + set_gcsr_sw_flag(LOONGARCH_CSR_MERRSAVE); + set_gcsr_sw_flag(LOONGARCH_CSR_CTAG); + set_gcsr_sw_flag(LOONGARCH_CSR_DEBUG); + set_gcsr_sw_flag(LOONGARCH_CSR_DERA); + set_gcsr_sw_flag(LOONGARCH_CSR_DESAVE); + set_gcsr_sw_flag(LOONGARCH_CSR_PRCFG1); + set_gcsr_sw_flag(LOONGARCH_CSR_PRCFG2); + set_gcsr_sw_flag(LOONGARCH_CSR_PRCFG3); + set_gcsr_sw_flag(LOONGARCH_CSR_PGD); + set_gcsr_sw_flag(LOONGARCH_CSR_TINTCLR); + + set_gcsr_sw_flag(LOONGARCH_CSR_FWPS); + set_gcsr_sw_flag(LOONGARCH_CSR_FWPC); + set_gcsr_sw_flag(LOONGARCH_CSR_MWPS); + set_gcsr_sw_flag(LOONGARCH_CSR_MWPC); + + set_gcsr_sw_flag(LOONGARCH_CSR_DB0ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_DB0MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_DB0CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_DB0ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_DB1ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_DB1MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_DB1CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_DB1ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_DB2ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_DB2MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_DB2CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_DB2ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_DB3ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_DB3MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_DB3CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_DB3ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_DB4ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_DB4MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_DB4CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_DB4ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_DB5ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_DB5MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_DB5CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_DB5ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_DB6ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_DB6MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_DB6CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_DB6ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_DB7ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_DB7MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_DB7CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_DB7ASID); + + set_gcsr_sw_flag(LOONGARCH_CSR_IB0ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_IB0MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_IB0CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_IB0ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_IB1ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_IB1MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_IB1CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_IB1ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_IB2ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_IB2MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_IB2CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_IB2ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_IB3ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_IB3MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_IB3CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_IB3ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_IB4ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_IB4MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_IB4CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_IB4ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_IB5ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_IB5MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_IB5CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_IB5ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_IB6ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_IB6MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_IB6CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_IB6ASID); + set_gcsr_sw_flag(LOONGARCH_CSR_IB7ADDR); + set_gcsr_sw_flag(LOONGARCH_CSR_IB7MASK); + set_gcsr_sw_flag(LOONGARCH_CSR_IB7CTRL); + set_gcsr_sw_flag(LOONGARCH_CSR_IB7ASID); + + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCTRL0); + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR0); + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCTRL1); + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR1); + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCTRL2); + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR2); + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCTRL3); + set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR3); +} + +static int kvm_loongarch_env_init(void) +{ + struct kvm_context *context; + int cpu, order; + void *addr; + + vmcs = alloc_percpu(struct kvm_context); + if (!vmcs) { + pr_err("kvm: failed to allocate percpu kvm_context\n"); + return -ENOMEM; + } + + kvm_loongarch_ops = kzalloc(sizeof(*kvm_loongarch_ops), GFP_KERNEL); + if (!kvm_loongarch_ops) + return -ENOMEM; + + /* + * There will be problem in world switch code if there + * is page fault reenter, since pgd register is shared + * between root kernel and kvm hypervisor. World switch + * entry need be unmapped area, cannot be tlb mapped area. + * In future if hw pagetable walking is supported, or there + * is separate pgd registers between root kernel and kvm + * hypervisor, copying about world switch code will not be used. + */ + + order = get_order(kvm_vector_size + kvm_enter_guest_size); + addr = (void *)__get_free_pages(GFP_KERNEL, order); + if (!addr) { + free_percpu(vmcs); + return -ENOMEM; + } + + memcpy(addr, kvm_vector_entry, kvm_vector_size); + memcpy(addr + kvm_vector_size, kvm_enter_guest, kvm_enter_guest_size); + flush_icache_range((unsigned long)addr, (unsigned long)addr + + kvm_vector_size + kvm_enter_guest_size); + kvm_loongarch_ops->guest_eentry = addr; + kvm_loongarch_ops->enter_guest = addr + kvm_vector_size; + kvm_loongarch_ops->page_order = order; + + vpid_mask = read_csr_gstat(); + vpid_mask = (vpid_mask & CSR_GSTAT_GIDBIT) >> CSR_GSTAT_GIDBIT_SHIFT; + if (vpid_mask) + vpid_mask = GENMASK(vpid_mask - 1, 0); + + for_each_possible_cpu(cpu) { + context = per_cpu_ptr(vmcs, cpu); + context->vpid_cache = vpid_mask + 1; + context->last_vcpu = NULL; + } + + _kvm_init_fault(); + _kvm_init_gcsr_flag(); + + return 0; +} + +static void kvm_loongarch_env_exit(void) +{ + free_pages((unsigned long)kvm_loongarch_ops->guest_eentry, kvm_loongarch_ops->page_order); + free_percpu(vmcs); +} + +static int kvm_loongarch_init(void) +{ + int r; + + if (!cpu_has_lvz) + return 0; + + r = kvm_loongarch_env_init(); + if (r) + return r; + + return kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); +} + +static void kvm_loongarch_exit(void) +{ + kvm_exit(); + kvm_loongarch_env_exit(); +} + +module_init(kvm_loongarch_init); +module_exit(kvm_loongarch_exit);

[v11,02/31] LoongArch: KVM: Implement kvm module related interface

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