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vmm: support PCI I/O regions on all architectures

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While non-Intel CPU architectures don't have a special concept of IO
address space, support for PCI I/O regions is still needed to be able
to handle PCI devices that use them.

With this change, I'm able to pass through an e1000e device from QEMU
to a cloud-hypervisor VM on aarch64 and use it in the cloud-hypervisor
guest.  Previously, it would hit the unimplemented!().

Signed-off-by: Alyssa Ross <hi@alyssa.is>
This commit is contained in:
Alyssa Ross
2024-12-13 12:55:33 +01:00
committed by Rob Bradford
parent dd8a5a7de8
commit 50bac1694f
6 changed files with 24 additions and 58 deletions
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12
vm-allocator/src/system.rs
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@@ -26,8 +26,8 @@ use crate::page_size::get_page_size;
/// # use vm_allocator::SystemAllocator;
/// # use vm_memory::{Address, GuestAddress, GuestUsize};
/// let mut allocator = SystemAllocator::new(
/// #[cfg(target_arch = "x86_64")] GuestAddress(0x1000),
/// #[cfg(target_arch = "x86_64")] 0x10000,
/// GuestAddress(0x1000),
/// 0x10000,
/// GuestAddress(0x10000000), 0x10000000,
/// #[cfg(target_arch = "x86_64")] vec![GsiApic::new(5, 19)]).unwrap();
/// #[cfg(target_arch = "x86_64")]
@@ -46,7 +46,6 @@ use crate::page_size::get_page_size;
///
/// ```
pub struct SystemAllocator {
#[cfg(target_arch = "x86_64")]
io_address_space: AddressAllocator,
platform_mmio_address_space: AddressAllocator,
gsi_allocator: GsiAllocator,
@@ -63,14 +62,13 @@ impl SystemAllocator {
/// * `apics` - (X86) Vector of APIC's.
///
pub fn new(
#[cfg(target_arch = "x86_64")] io_base: GuestAddress,
#[cfg(target_arch = "x86_64")] io_size: GuestUsize,
io_base: GuestAddress,
io_size: GuestUsize,
platform_mmio_base: GuestAddress,
platform_mmio_size: GuestUsize,
#[cfg(target_arch = "x86_64")] apics: Vec<GsiApic>,
) -> Option<Self> {
Some(SystemAllocator {
#[cfg(target_arch = "x86_64")]
io_address_space: AddressAllocator::new(io_base, io_size)?,
platform_mmio_address_space: AddressAllocator::new(
platform_mmio_base,
@@ -93,7 +91,6 @@ impl SystemAllocator {
self.gsi_allocator.allocate_gsi().ok()
}
#[cfg(target_arch = "x86_64")]
/// Reserves a section of `size` bytes of IO address space.
pub fn allocate_io_addresses(
&mut self,
@@ -119,7 +116,6 @@ impl SystemAllocator {
)
}
#[cfg(target_arch = "x86_64")]
/// Free an IO address range.
/// We can only free a range if it matches exactly an already allocated range.
pub fn free_io_addresses(&mut self, address: GuestAddress, size: GuestUsize) {