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vmm: device_manager: Use MemoryManager to create KVM mapping

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Use the newly exported funtionality to reduce the amount of duplicated
code.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2019-12-20 16:11:30 +00:00
parent 962dec2913
commit a551398135
1 changed files with 25 additions and 45 deletions
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70
vmm/src/device_manager.rs
View File

@ -12,13 +12,13 @@
extern crate vm_device;
use crate::config::{ConsoleOutputMode, VmConfig};
use crate::memory_manager::MemoryManager;
use crate::memory_manager::{Error as MemoryManagerError, MemoryManager};
use crate::vm::VmInfo;
#[cfg(feature = "acpi")]
use acpi_tables::{aml, aml::Aml};
use arch::layout;
use devices::{ioapic, HotPlugNotificationType};
use kvm_bindings::{kvm_irq_routing_entry, kvm_userspace_memory_region};
use kvm_bindings::kvm_irq_routing_entry;
use kvm_ioctls::*;
use libc::O_TMPFILE;
use libc::TIOCGWINSZ;
@ -180,6 +180,9 @@ pub enum DeviceManagerError {
// Failed to make hotplug notification
HotPlugNotification(io::Error),
// Error from a memory manager operation
MemoryManager(MemoryManagerError),
}
pub type DeviceManagerResult<T> = result::Result<T, DeviceManagerError>;
@ -1070,15 +1073,16 @@ impl DeviceManager {
mmap_regions.push((addr, fs_cache as usize));
let mem_region = kvm_userspace_memory_region {
slot: memory_manager.lock().unwrap().allocate_kvm_memory_slot(),
guest_phys_addr: fs_guest_addr.raw_value(),
memory_size: fs_cache,
userspace_addr: addr as u64,
flags: 0,
};
// Safe because the guest regions are guaranteed not to overlap.
let _ = unsafe { vm_info.vm_fd.set_user_memory_region(mem_region) };
memory_manager
.lock()
.unwrap()
.create_userspace_mapping(
fs_guest_addr.raw_value(),
fs_cache,
addr as u64,
false,
)
.map_err(DeviceManagerError::MemoryManager)?;
let mut region_list = Vec::new();
region_list.push(VirtioSharedMemory {
@ -1173,40 +1177,16 @@ impl DeviceManager {
mmap_regions.push((addr, size as usize));
let mem_region = kvm_userspace_memory_region {
slot: memory_manager.lock().unwrap().allocate_kvm_memory_slot(),
guest_phys_addr: pmem_guest_addr.raw_value(),
memory_size: size,
userspace_addr: addr as u64,
flags: 0,
};
// Safe because the guest regions are guaranteed not to overlap.
let _ = unsafe { vm_info.vm_fd.set_user_memory_region(mem_region) };
// Mark the pages as mergeable if explicitly asked for.
if pmem_cfg.mergeable {
// Safe because the address and size are valid since the
// mmap succeeded..
let ret = unsafe {
libc::madvise(
addr as *mut libc::c_void,
size as libc::size_t,
libc::MADV_MERGEABLE,
)
};
if ret != 0 {
let err = io::Error::last_os_error();
// Safe to unwrap because the error is constructed with
// last_os_error(), which ensures the output will be Some().
let errno = err.raw_os_error().unwrap();
if errno == libc::EINVAL {
warn!("kernel not configured with CONFIG_KSM");
} else {
warn!("madvise error: {}", err);
}
warn!("failed to mark pages as mergeable");
}
}
memory_manager
.lock()
.unwrap()
.create_userspace_mapping(
pmem_guest_addr.raw_value(),
size,
addr as u64,
pmem_cfg.mergeable,
)
.map_err(DeviceManagerError::MemoryManager)?;
let virtio_pmem_device = Arc::new(Mutex::new(
vm_virtio::Pmem::new(file, pmem_guest_addr, size as GuestUsize, pmem_cfg.iommu)