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virtio-devices: balloon: Use checked descriptor iterator

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Replace manual translate_gva calls with checked_iter in both the
inflate/deflate and reporting queue handlers.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-05-13 16:23:04 +02:00
committed by Rob Bradford
parent 33e3f4e29e
commit 39264eea50
1 changed files with 24 additions and 26 deletions
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50
virtio-devices/src/balloon.rs
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@@ -34,7 +34,8 @@ use vm_memory::{
GuestMemoryError, GuestMemoryRegion,
};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
use vm_virtio::{AccessPlatform, Translatable};
use vm_virtio::AccessPlatform;
use vm_virtio::checked_descriptor::DescriptorChainExt;
use vmm_sys_util::eventfd::EventFd;
use crate::seccomp_filters::Thread;
@@ -276,7 +277,14 @@ impl BalloonEpollHandler {
{
let data_chunk_size = size_of::<u32>();
while let Some(desc) = desc_chain.next() {
let results: Vec<_> = desc_chain
.checked_iter(self.access_platform.as_deref())
.collect();
for result in results {
let desc = match result {
Ok(d) => d,
Err(_) => break,
};
if desc.is_write_only() {
warn!("Skipping device-writable descriptor on inflate/deflate queue");
continue;
@@ -298,19 +306,10 @@ impl BalloonEpollHandler {
let mut offset = 0u64;
while offset < desc.len() as u64 {
let Some(base) = desc.addr().checked_add(offset) else {
let Some(addr) = desc.addr().checked_add(offset) else {
warn!("Address overflow in balloon descriptor");
break;
};
let addr = match base
.translate_gva(self.access_platform.as_deref(), data_chunk_size)
{
Ok(a) => a,
Err(e) => {
warn!("Failed to translate descriptor address: {e}");
break;
}
};
let pfn: u32 = match desc_chain.memory().read_obj(addr) {
Ok(v) => v,
Err(e) => {
@@ -368,21 +367,20 @@ impl BalloonEpollHandler {
self.queues[queue_index].pop_descriptor_chain(self.mem.memory())
{
let mut descs_len = 0;
while let Some(desc) = desc_chain.next() {
descs_len += desc.len();
let addr = match desc
.addr()
.translate_gva(self.access_platform.as_deref(), desc.len() as usize)
{
Ok(a) => a,
Err(e) => {
warn!("Failed to translate reporting descriptor address: {e}");
continue;
}
let results: Vec<_> = desc_chain
.checked_iter(self.access_platform.as_deref())
.collect();
for result in results {
let desc = match result {
Ok(d) => d,
Err(_) => break,
};
if let Err(e) =
Self::release_memory_range(desc_chain.memory(), addr, desc.len() as usize)
{
descs_len += desc.len();
if let Err(e) = Self::release_memory_range(
desc_chain.memory(),
desc.addr(),
desc.len() as usize,
) {
warn!("Failed to release reported memory range: {e}");
}
}