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misc: Change cpu ID type from u8 to u32

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This is the first change to Cloud Hypervisor in a series of changes
intended to increase the max number of supported vCPUs in guest VMs,
which is currently limited to 255 (254 on x86_64).

No user-visible/behavior changes are expected as a result of
applying this patch, as the type of boot_cpus and related
fields in config structs remains u8 for now, and all configuration
validations remain the same.

Signed-off-by: Barret Rhoden <brho@google.com>
Signed-off-by: Neel Natu <neelnatu@google.com>
Signed-off-by: Ofir Weisse <oweisse@google.com>
Signed-off-by: Peter Oskolkov <posk@google.com>
This commit is contained in:
Peter Oskolkov
2025-07-29 19:02:20 +00:00
committed by Bo Chen
parent 5d478c534e
commit aa8e9cd91a
21 changed files with 116 additions and 123 deletions
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4
vmm/src/lib.rs
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@@ -1808,7 +1808,7 @@ impl RequestHandler for Vmm {
fn vm_resize(
&mut self,
desired_vcpus: Option<u8>,
desired_vcpus: Option<u32>,
desired_ram: Option<u64>,
desired_balloon: Option<u64>,
) -> result::Result<(), VmError> {
@@ -1824,7 +1824,7 @@ impl RequestHandler for Vmm {
} else {
let mut config = self.vm_config.as_ref().unwrap().lock().unwrap();
if let Some(desired_vcpus) = desired_vcpus {
config.cpus.boot_vcpus = desired_vcpus;
config.cpus.boot_vcpus = desired_vcpus.try_into().unwrap();
}
if let Some(desired_ram) = desired_ram {
config.memory.size = desired_ram;