Reviewed-by: Bibo, Mao <maobibo@xxxxxxxxxxx>
在 2023/5/30 09:51, Tianrui Zhao 写道:
> Implement vcpu create and destroy interface, saving some info
> into vcpu arch structure such as vcpu exception entrance, vcpu
> enter guest pointer, etc. Init vcpu timer and set address
> translation mode when vcpu create.
>
> Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
> ---
> arch/loongarch/kvm/vcpu.c | 88 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 88 insertions(+)
> create mode 100644 arch/loongarch/kvm/vcpu.c
>
> diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
> new file mode 100644
> index 000000000000..24b5b00266a1
> --- /dev/null
> +++ b/arch/loongarch/kvm/vcpu.c
> @@ -0,0 +1,88 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
> + */
> +
> +#include <linux/kvm_host.h>
> +#include <asm/fpu.h>
> +#include <asm/loongarch.h>
> +#include <asm/setup.h>
> +#include <asm/time.h>
> +
> +#define CREATE_TRACE_POINTS
> +#include "trace.h"
> +
> +int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
> +{
> + return 0;
> +}
> +
> +int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
> +{
> + unsigned long timer_hz;
> + struct loongarch_csrs *csr;
> +
> + vcpu->arch.vpid = 0;
> +
> + hrtimer_init(&vcpu->arch.swtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
> + vcpu->arch.swtimer.function = kvm_swtimer_wakeup;
> + vcpu->kvm->arch.online_vcpus = vcpu->vcpu_id + 1;
> +
> + vcpu->arch.guest_eentry = (unsigned long)kvm_loongarch_ops->guest_eentry;
> + vcpu->arch.handle_exit = _kvm_handle_exit;
> + vcpu->arch.csr = kzalloc(sizeof(struct loongarch_csrs), GFP_KERNEL);
> + if (!vcpu->arch.csr)
> + return -ENOMEM;
> +
> + /*
> + * kvm all exceptions share one exception entry, and host <-> guest switch
> + * also switch excfg.VS field, keep host excfg.VS info here
> + */
> + vcpu->arch.host_ecfg = (read_csr_ecfg() & CSR_ECFG_VS);
> +
> + /* Init */
> + vcpu->arch.last_sched_cpu = -1;
> + vcpu->arch.last_exec_cpu = -1;
> +
> + /*
> + * Initialize guest register state to valid architectural reset state.
> + */
> + timer_hz = calc_const_freq();
> + kvm_init_timer(vcpu, timer_hz);
> +
> + /* Set Initialize mode for GUEST */
> + csr = vcpu->arch.csr;
> + kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CRMD, CSR_CRMD_DA);
> +
> + /* Set cpuid */
> + kvm_write_sw_gcsr(csr, LOONGARCH_CSR_TMID, vcpu->vcpu_id);
> +
> + /* start with no pending virtual guest interrupts */
> + csr->csrs[LOONGARCH_CSR_GINTC] = 0;
> +
> + return 0;
> +}
> +
> +void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
> +{
> +}
> +
> +void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
> +{
> + int cpu;
> + struct kvm_context *context;
> +
> + hrtimer_cancel(&vcpu->arch.swtimer);
> + kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
> + kfree(vcpu->arch.csr);
> +
> + /*
> + * If the vCPU is freed and reused as another vCPU, we don't want the
> + * matching pointer wrongly hanging around in last_vcpu.
> + */
> + for_each_possible_cpu(cpu) {
> + context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
> + if (context->last_vcpu == vcpu)
> + context->last_vcpu = NULL;
> + }
> +}
