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vmm, hypervisor: introduce and use make_user_memory_region

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This removes the last KVM-ism from memory_manager. Also make use of that
method in other places.

Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu 2020-07-04 11:38:17 +00:00 committed by Samuel Ortiz
parent 8d97d628c3
commit cfa758fbb1
5 changed files with 49 additions and 25 deletions
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19
hypervisor/src/kvm/mod.rs
View File

@ -172,6 +172,25 @@ impl vm::Vm for KvmVm {
.map_err(|e| vm::HypervisorVmError::SetGsiRouting(e.into()))
}
///
/// Creates a memory region structure that can be used with set_user_memory_region
///
fn make_user_memory_region(
&self,
slot: u32,
guest_phys_addr: u64,
memory_size: u64,
userspace_addr: u64,
readonly: bool,
) -> MemoryRegion {
MemoryRegion {
slot,
guest_phys_addr,
memory_size,
userspace_addr,
flags: if readonly { KVM_MEM_READONLY } else { 0 },
}
}
///
/// Creates/modifies a guest physical memory slot.
///
fn set_user_memory_region(&self, user_memory_region: MemoryRegion) -> vm::Result<()> {

9
hypervisor/src/vm.rs
View File

@ -143,6 +143,15 @@ pub trait Vm: Send + Sync {
fn unregister_ioevent(&self, fd: &EventFd, addr: &IoEventAddress) -> Result<()>;
/// Sets the GSI routing table entries, overwriting any previously set
fn set_gsi_routing(&self, irq_routing: &IrqRouting) -> Result<()>;
/// Creates a memory region structure that can be used with set_user_memory_region
fn make_user_memory_region(
&self,
slot: u32,
guest_phys_addr: u64,
memory_size: u64,
userspace_addr: u64,
readonly: bool,
) -> MemoryRegion;
/// Creates/modifies a guest physical memory slot.
fn set_user_memory_region(&self, user_memory_region: MemoryRegion) -> Result<()>;
/// Creates an emulated device in the kernel.

14
vmm/src/device_manager.rs
View File

@ -588,13 +588,13 @@ impl DeviceRelocation for AddressManager {
if let Some(mut shm_regions) = virtio_dev.get_shm_regions() {
if shm_regions.addr.raw_value() == old_base {
// Remove old region from KVM by passing a size of 0.
let mut mem_region = hypervisor::MemoryRegion {
slot: shm_regions.mem_slot,
guest_phys_addr: old_base,
memory_size: 0,
userspace_addr: shm_regions.host_addr,
flags: 0,
};
let mut mem_region = self.vm.make_user_memory_region(
shm_regions.mem_slot,
old_base,
0,
shm_regions.host_addr,
false,
);
self.vm.set_user_memory_region(mem_region).map_err(|e| {
io::Error::new(

18
vmm/src/memory_manager.rs
View File

@ -676,17 +676,13 @@ impl MemoryManager {
readonly: bool,
) -> Result<u32, Error> {
let slot = self.allocate_memory_slot();
let mem_region = hypervisor::MemoryRegion {
let mem_region = self.vm.make_user_memory_region(
slot,
guest_phys_addr,
memory_size,
userspace_addr,
flags: if readonly {
hypervisor::kvm::KVM_MEM_READONLY
} else {
0
},
};
readonly,
);
self.vm
.set_user_memory_region(mem_region)
@ -733,13 +729,13 @@ impl MemoryManager {
mergeable: bool,
slot: u32,
) -> Result<(), Error> {
let mem_region = hypervisor::MemoryRegion {
let mem_region = self.vm.make_user_memory_region(
slot,
guest_phys_addr,
memory_size: 0,
0, /* memory_size -- using 0 removes this slot */
userspace_addr,
flags: 0,
};
false, /* readonly -- don't care */
);
self.vm
.set_user_memory_region(mem_region)

14
vmm/src/vm.rs
View File

@ -1451,13 +1451,13 @@ pub fn test_vm() {
let vm = hv.create_vm().expect("new VM creation failed");
mem.with_regions(|index, region| {
let mem_region = hypervisor::MemoryRegion {
slot: index as u32,
guest_phys_addr: region.start_addr().raw_value(),
memory_size: region.len() as u64,
userspace_addr: region.as_ptr() as u64,
flags: 0,
};
let mem_region = vm.make_user_memory_region(
index as u32,
region.start_addr().raw_value(),
region.len() as u64,
region.as_ptr() as u64,
false,
);
vm.set_user_memory_region(mem_region)
})