use crate::arch::kvm::vmx::vcpu::VmxVcpu; use crate::arch::KVMArch; use crate::arch::MMArch; use crate::libs::mutex::Mutex; use crate::mm::MemoryManagementArch; use alloc::sync::Arc; use alloc::vec::Vec; use log::debug; use system_error::SystemError; // use super::HOST_STACK_SIZE; use super::host_mem::{ KvmMemoryChange, KvmMemorySlot, KvmMemorySlots, KvmUserspaceMemoryRegion, KVM_ADDRESS_SPACE_NUM, KVM_MEM_LOG_DIRTY_PAGES, KVM_MEM_MAX_NR_PAGES, KVM_MEM_READONLY, KVM_MEM_SLOTS_NUM, KVM_USER_MEM_SLOTS, PAGE_SHIFT, }; #[derive(Debug, Clone)] pub struct Vm { pub id: usize, // vcpu config pub nr_vcpus: u32, /* Number of cpus to run */ pub vcpu: Vec>>, // memory config pub nr_mem_slots: u32, /* Number of memory slots in each address space */ pub memslots: [KvmMemorySlots; KVM_ADDRESS_SPACE_NUM], #[allow(dead_code)] // arch related config pub arch: KVMArch, } impl Vm { pub fn new(id: usize) -> Result { let vcpu = Vec::new(); // Allocate stack for vm-exit handlers and fill it with garbage data let instance = Self { id, nr_vcpus: 0, vcpu, nr_mem_slots: KVM_MEM_SLOTS_NUM, memslots: [KvmMemorySlots::default(); KVM_ADDRESS_SPACE_NUM], arch: Default::default(), }; Ok(instance) } /// Allocate some memory and give it an address in the guest physical address space. pub fn set_user_memory_region( &mut self, mem: &KvmUserspaceMemoryRegion, ) -> Result<(), SystemError> { debug!("set_user_memory_region"); let id: u16 = mem.slot as u16; // slot id let as_id = mem.slot >> 16; // address space id debug!("id={}, as_id={}", id, as_id); // 检查slot是否合法 if mem.slot as usize >= self.nr_mem_slots as usize { return Err(SystemError::EINVAL); } // 检查flags是否合法 self.check_memory_region_flag(mem)?; // 内存大小和地址必须是页对齐的 if (mem.memory_size & (MMArch::PAGE_SIZE - 1) as u64) != 0 || (mem.guest_phys_addr & (MMArch::PAGE_SIZE - 1) as u64) != 0 { return Err(SystemError::EINVAL); } // 检查地址空间是否合法 if as_id >= (KVM_ADDRESS_SPACE_NUM as u32) || id >= KVM_MEM_SLOTS_NUM as u16 { return Err(SystemError::EINVAL); } // if mem.memory_size < 0 { // return Err(SystemError::EINVAL); // } let slot = &self.memslots[as_id as usize].memslots[id as usize]; let base_gfn = mem.guest_phys_addr >> PAGE_SHIFT; let npages = mem.memory_size >> PAGE_SHIFT; if npages > KVM_MEM_MAX_NR_PAGES as u64 { return Err(SystemError::EINVAL); } let change: KvmMemoryChange; let old_slot = slot; let mut new_slot = KvmMemorySlot { base_gfn, // 虚机内存区间起始物理页框号 npages, // 虚机内存区间页数,即内存区间的大小 // dirty_bitmap: old_slot.dirty_bitmap, userspace_addr: mem.userspace_addr, // 虚机内存区间对应的主机虚拟地址 flags: mem.flags, // 虚机内存区间属性 id, // 虚机内存区间id }; // 判断新memoryslot的类型 if npages != 0 { //映射内存有大小,不是删除内存条 if old_slot.npages == 0 { //内存槽号没有虚拟内存条,意味内存新创建 change = KvmMemoryChange::Create; } else { //修改已存在的内存,表示修改标志或者平移映射地址 // 检查内存条是否可以修改 if mem.userspace_addr != old_slot.userspace_addr || npages != old_slot.npages || (new_slot.flags ^ old_slot.flags & KVM_MEM_READONLY) != 0 { return Err(SystemError::EINVAL); } if new_slot.base_gfn != old_slot.base_gfn { //guest地址不同,内存条平移 change = KvmMemoryChange::Move; } else if new_slot.flags != old_slot.flags { //内存条标志不同,修改标志 change = KvmMemoryChange::FlagsOnly; } else { return Ok(()); } } } else { if old_slot.npages == 0 { //内存槽号没有虚拟内存条,不可以删除 return Err(SystemError::EINVAL); } //申请插入的内存为0,而内存槽上有内存,意味删除 change = KvmMemoryChange::Delete; new_slot.base_gfn = 0; new_slot.flags = 0; } if change == KvmMemoryChange::Create || change == KvmMemoryChange::Move { // 检查内存区域是否重叠 for i in 0..KVM_MEM_SLOTS_NUM { let memslot = &self.memslots[as_id as usize].memslots[i as usize]; if memslot.id == id || memslot.id as u32 >= KVM_USER_MEM_SLOTS { continue; } // 当前已有的slot与new在guest物理地址上有交集 if !(base_gfn + npages <= memslot.base_gfn || memslot.base_gfn + memslot.npages <= base_gfn) { return Err(SystemError::EEXIST); } } } if (new_slot.flags & KVM_MEM_LOG_DIRTY_PAGES) == 0 { // new_slot.dirty_bitmap = 0; } // 根据flags的值,决定是否创建内存脏页 // if (new_slot.flags & KVM_MEM_LOG_DIRTY_PAGES)!=0 && new_slot.dirty_bitmap == 0 { // let type_size = core::mem::size_of::() as u64; // let dirty_bytes = 2 * ((new_slot.npages+type_size-1) / type_size) / 8; // new_slot.dirty_bitmap = Box::new(vec![0; dirty_bytes as u8]); // } if change == KvmMemoryChange::Create { new_slot.userspace_addr = mem.userspace_addr; let mut memslots = self.memslots[as_id as usize].memslots; memslots[id as usize] = new_slot; self.memslots[as_id as usize].memslots = memslots; self.memslots[as_id as usize].used_slots += 1; // KVMArch::kvm_arch_create_memslot(&mut new_slot, npages); // KVMArch::kvm_arch_commit_memory_region(mem, &new_slot, old_slot, change); } // TODO--KvmMemoryChange::Delete & Move Ok(()) } fn check_memory_region_flag(&self, mem: &KvmUserspaceMemoryRegion) -> Result<(), SystemError> { let valid_flags = KVM_MEM_LOG_DIRTY_PAGES; // 除了valid_flags之外的flags被置1了,就返回错误 if mem.flags & !valid_flags != 0 { return Err(SystemError::EINVAL); } Ok(()) } }