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    Subject[PATCH v2 02/29] LoongArch: KVM: Implement kvm module related interface
    Date
    Implement loongarch kvm module init, module exit interface,
    using kvm context to save the vpid info and vcpu world switch
    interface pointer.

    Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
    ---
    arch/loongarch/kvm/main.c | 81 +++++++++++++++++++++++++++++++++++++++
    1 file changed, 81 insertions(+)
    create mode 100644 arch/loongarch/kvm/main.c

    diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
    new file mode 100644
    index 000000000..d7969d02a
    --- /dev/null
    +++ b/arch/loongarch/kvm/main.c
    @@ -0,0 +1,81 @@
    +// 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/kvm_host.h>
    +#include <asm/cacheflush.h>
    +
    +static struct kvm_context __percpu *vmcs;
    +
    +int kvm_arch_init(void *opaque)
    +{
    + struct kvm_context *context;
    + unsigned long vpid_mask;
    + 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;
    + }
    +
    + 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);
    +
    + 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_mask = vpid_mask;
    + context->vpid_cache = context->vpid_mask + 1;
    + context->last_vcpu = NULL;
    + context->kvm_eentry = addr;
    + context->kvm_enter_guest = addr + kvm_vector_size;
    + context->page_order = order;
    + }
    +
    + _kvm_init_fault();
    +
    + return 0;
    +}
    +
    +void kvm_arch_exit(void)
    +{
    + struct kvm_context *context = per_cpu_ptr(vmcs, 0);
    +
    + free_pages((unsigned long)context->kvm_eentry, context->page_order);
    + free_percpu(vmcs);
    +}
    +
    +static int kvm_loongarch_init(void)
    +{
    + if (!cpu_has_lvz)
    + return 0;
    +
    + return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
    +}
    +
    +static void kvm_loongarch_exit(void)
    +{
    + kvm_exit();
    +}
    +
    +module_init(kvm_loongarch_init);
    +module_exit(kvm_loongarch_exit);
    --
    2.31.1
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