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vfio: Implement move_bar() from PciDevice trait

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Everytime a PCI BAR is moved, the KVM regions need to be updated.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-10-28 09:34:16 -07:00 committed by Samuel Ortiz
parent c865f93c9b
commit e536f88012
1 changed files with 50 additions and 1 deletions
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51
vfio/src/vfio_pci.rs
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@ -255,6 +255,8 @@ struct MmioRegion {
start: GuestAddress,
length: GuestUsize,
index: u32,
mem_slot: Option<u32>,
host_addr: Option<u64>,
}
struct VfioPciConfig {
@ -603,7 +605,7 @@ impl VfioPciDevice {
let fd = self.device.as_raw_fd();
let mut new_mem_slot = mem_slot;
for region in self.mmio_regions.iter() {
for region in self.mmio_regions.iter_mut() {
// We want to skip the mapping of the BAR containing the MSI-X
// table even if it is mappable. The reason is we need to trap
// any access to the MSI-X table and update the GSI routing
@ -658,6 +660,11 @@ impl VfioPciDevice {
vm.set_user_memory_region(mem_region)
.map_err(VfioPciError::MapRegionGuest)?;
}
// Update the region with memory mapped info.
region.mem_slot = Some(new_mem_slot);
region.host_addr = Some(host_addr as u64);
new_mem_slot += 1;
}
}
@ -870,6 +877,8 @@ impl PciDevice for VfioPciDevice {
start: bar_addr,
length: region_size,
index: bar_id as u32,
mem_slot: None,
host_addr: None,
});
bar_id += 1;
@ -986,4 +995,44 @@ impl PciDevice for VfioPciDevice {
}
}
}
fn move_bar(&mut self, old_base: u64, new_base: u64) {
for region in self.mmio_regions.iter_mut() {
if region.start.raw_value() == old_base {
region.start = GuestAddress(new_base);
if let Some(mem_slot) = region.mem_slot {
if let Some(host_addr) = region.host_addr {
let (mmap_offset, mmap_size) = self.device.get_region_mmap(region.index);
// Remove old region from KVM
let old_mem_region = kvm_userspace_memory_region {
slot: mem_slot,
guest_phys_addr: old_base + mmap_offset,
memory_size: 0,
userspace_addr: host_addr,
flags: 0,
};
// Safe because the guest regions are guaranteed not to overlap.
unsafe {
self.vm_fd.set_user_memory_region(old_mem_region).unwrap();
}
// Insert new region to KVM
let new_mem_region = kvm_userspace_memory_region {
slot: mem_slot,
guest_phys_addr: new_base + mmap_offset,
memory_size: mmap_size as u64,
userspace_addr: host_addr,
flags: 0,
};
// Safe because the guest regions are guaranteed not to overlap.
unsafe {
self.vm_fd.set_user_memory_region(new_mem_region).unwrap();
}
}
}
}
}
}
}