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https://github.com/torvalds/linux
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RISC-V: KVM: Reorganize SBI code by moving SBI v0.1 to its own file
With SBI v0.2, there may be more SBI extensions in future. It makes more sense to group related extensions in separate files. Guest kernel will choose appropriate SBI version dynamically. Move the existing implementation to a separate file so that it can be removed in future without much conflict. Signed-off-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
Anup Patel
parent
cf70be9d21
commit
a046c2d857
4 changed files with 146 additions and 131 deletions
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@ -25,5 +25,7 @@ struct kvm_vcpu_sbi_extension {
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bool *exit);
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};
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void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
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const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(unsigned long extid);
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#endif /* __RISCV_KVM_VCPU_SBI_H__ */
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@ -19,4 +19,5 @@ kvm-y += vcpu_exit.o
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kvm-y += vcpu_fp.o
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kvm-y += vcpu_switch.o
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kvm-y += vcpu_sbi.o
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kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o
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kvm-y += vcpu_timer.o
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@ -9,9 +9,7 @@
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kvm_host.h>
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#include <asm/csr.h>
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#include <asm/sbi.h>
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#include <asm/kvm_vcpu_timer.h>
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#include <asm/kvm_vcpu_sbi.h>
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static int kvm_linux_err_map_sbi(int err)
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@ -32,8 +30,21 @@ static int kvm_linux_err_map_sbi(int err)
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};
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}
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static void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu,
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struct kvm_run *run)
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#ifdef CONFIG_RISCV_SBI_V01
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01;
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#else
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static const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = {
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.extid_start = -1UL,
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.extid_end = -1UL,
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.handler = NULL,
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};
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#endif
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static const struct kvm_vcpu_sbi_extension *sbi_ext[] = {
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&vcpu_sbi_ext_v01,
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};
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void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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@ -71,123 +82,6 @@ int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
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return 0;
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}
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#ifdef CONFIG_RISCV_SBI_V01
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static void kvm_sbi_system_shutdown(struct kvm_vcpu *vcpu,
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struct kvm_run *run, u32 type)
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{
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unsigned long i;
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struct kvm_vcpu *tmp;
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kvm_for_each_vcpu(i, tmp, vcpu->kvm)
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tmp->arch.power_off = true;
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kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
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memset(&run->system_event, 0, sizeof(run->system_event));
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run->system_event.type = type;
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run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
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}
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static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
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unsigned long *out_val,
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struct kvm_cpu_trap *utrap,
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bool *exit)
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{
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ulong hmask;
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int i, ret = 0;
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u64 next_cycle;
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struct kvm_vcpu *rvcpu;
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struct cpumask cm, hm;
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struct kvm *kvm = vcpu->kvm;
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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switch (cp->a7) {
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case SBI_EXT_0_1_CONSOLE_GETCHAR:
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case SBI_EXT_0_1_CONSOLE_PUTCHAR:
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/*
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* The CONSOLE_GETCHAR/CONSOLE_PUTCHAR SBI calls cannot be
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* handled in kernel so we forward these to user-space
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*/
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kvm_riscv_vcpu_sbi_forward(vcpu, run);
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*exit = true;
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break;
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case SBI_EXT_0_1_SET_TIMER:
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#if __riscv_xlen == 32
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next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
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#else
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next_cycle = (u64)cp->a0;
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#endif
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ret = kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
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break;
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case SBI_EXT_0_1_CLEAR_IPI:
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ret = kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_SOFT);
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break;
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case SBI_EXT_0_1_SEND_IPI:
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if (cp->a0)
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hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
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utrap);
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else
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hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
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if (utrap->scause)
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break;
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for_each_set_bit(i, &hmask, BITS_PER_LONG) {
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rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
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ret = kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT);
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if (ret < 0)
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break;
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}
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break;
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case SBI_EXT_0_1_SHUTDOWN:
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kvm_sbi_system_shutdown(vcpu, run, KVM_SYSTEM_EVENT_SHUTDOWN);
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*exit = true;
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break;
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case SBI_EXT_0_1_REMOTE_FENCE_I:
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case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
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case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
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if (cp->a0)
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hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
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utrap);
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else
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hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
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if (utrap->scause)
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break;
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cpumask_clear(&cm);
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for_each_set_bit(i, &hmask, BITS_PER_LONG) {
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rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
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if (rvcpu->cpu < 0)
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continue;
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cpumask_set_cpu(rvcpu->cpu, &cm);
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}
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riscv_cpuid_to_hartid_mask(&cm, &hm);
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if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
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ret = sbi_remote_fence_i(cpumask_bits(&hm));
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else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA)
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ret = sbi_remote_hfence_vvma(cpumask_bits(&hm),
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cp->a1, cp->a2);
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else
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ret = sbi_remote_hfence_vvma_asid(cpumask_bits(&hm),
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cp->a1, cp->a2, cp->a3);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = {
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.extid_start = SBI_EXT_0_1_SET_TIMER,
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.extid_end = SBI_EXT_0_1_SHUTDOWN,
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.handler = kvm_sbi_ext_v01_handler,
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};
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static const struct kvm_vcpu_sbi_extension *sbi_ext[] = {
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&vcpu_sbi_ext_v01,
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};
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const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(unsigned long extid)
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{
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int i = 0;
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@ -214,9 +108,11 @@ int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run)
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sbi_ext = kvm_vcpu_sbi_find_ext(cp->a7);
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if (sbi_ext && sbi_ext->handler) {
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#ifdef CONFIG_RISCV_SBI_V01
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if (cp->a7 >= SBI_EXT_0_1_SET_TIMER &&
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cp->a7 <= SBI_EXT_0_1_SHUTDOWN)
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ext_is_v01 = true;
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#endif
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ret = sbi_ext->handler(vcpu, run, &out_val, &utrap, &userspace_exit);
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} else {
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/* Return error for unsupported SBI calls */
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@ -256,13 +152,3 @@ int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run)
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return ret;
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}
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#else
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int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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kvm_riscv_vcpu_sbi_forward(vcpu, run);
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return 0;
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}
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#endif
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126
arch/riscv/kvm/vcpu_sbi_v01.c
Normal file
126
arch/riscv/kvm/vcpu_sbi_v01.c
Normal file
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@ -0,0 +1,126 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2021 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Atish Patra <atish.patra@wdc.com>
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kvm_host.h>
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#include <asm/csr.h>
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#include <asm/sbi.h>
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#include <asm/kvm_vcpu_timer.h>
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#include <asm/kvm_vcpu_sbi.h>
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static void kvm_sbi_system_shutdown(struct kvm_vcpu *vcpu,
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struct kvm_run *run, u32 type)
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{
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unsigned long i;
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struct kvm_vcpu *tmp;
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kvm_for_each_vcpu(i, tmp, vcpu->kvm)
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tmp->arch.power_off = true;
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kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
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memset(&run->system_event, 0, sizeof(run->system_event));
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run->system_event.type = type;
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run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
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}
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static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
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unsigned long *out_val,
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struct kvm_cpu_trap *utrap,
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bool *exit)
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{
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ulong hmask;
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int i, ret = 0;
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u64 next_cycle;
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struct kvm_vcpu *rvcpu;
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struct cpumask cm, hm;
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struct kvm *kvm = vcpu->kvm;
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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switch (cp->a7) {
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case SBI_EXT_0_1_CONSOLE_GETCHAR:
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case SBI_EXT_0_1_CONSOLE_PUTCHAR:
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/*
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* The CONSOLE_GETCHAR/CONSOLE_PUTCHAR SBI calls cannot be
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* handled in kernel so we forward these to user-space
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*/
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kvm_riscv_vcpu_sbi_forward(vcpu, run);
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*exit = true;
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break;
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case SBI_EXT_0_1_SET_TIMER:
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#if __riscv_xlen == 32
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next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
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#else
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next_cycle = (u64)cp->a0;
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#endif
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ret = kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
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break;
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case SBI_EXT_0_1_CLEAR_IPI:
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ret = kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_SOFT);
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break;
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case SBI_EXT_0_1_SEND_IPI:
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if (cp->a0)
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hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
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utrap);
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else
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hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
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if (utrap->scause)
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break;
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for_each_set_bit(i, &hmask, BITS_PER_LONG) {
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rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
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ret = kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT);
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if (ret < 0)
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break;
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}
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break;
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case SBI_EXT_0_1_SHUTDOWN:
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kvm_sbi_system_shutdown(vcpu, run, KVM_SYSTEM_EVENT_SHUTDOWN);
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*exit = true;
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break;
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case SBI_EXT_0_1_REMOTE_FENCE_I:
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case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
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case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
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if (cp->a0)
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hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
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utrap);
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else
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hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
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if (utrap->scause)
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break;
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cpumask_clear(&cm);
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for_each_set_bit(i, &hmask, BITS_PER_LONG) {
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rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
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if (rvcpu->cpu < 0)
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continue;
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cpumask_set_cpu(rvcpu->cpu, &cm);
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}
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riscv_cpuid_to_hartid_mask(&cm, &hm);
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if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
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ret = sbi_remote_fence_i(cpumask_bits(&hm));
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else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA)
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ret = sbi_remote_hfence_vvma(cpumask_bits(&hm),
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cp->a1, cp->a2);
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else
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ret = sbi_remote_hfence_vvma_asid(cpumask_bits(&hm),
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cp->a1, cp->a2, cp->a3);
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break;
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default:
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ret = -EINVAL;
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break;
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};
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return ret;
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}
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = {
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.extid_start = SBI_EXT_0_1_SET_TIMER,
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.extid_end = SBI_EXT_0_1_SHUTDOWN,
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.handler = kvm_sbi_ext_v01_handler,
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};
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