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vmm: tdx: Fix a deadlock while accessing vm_config

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The lock to `vm_config` is held for accessing `cpus.kvm_hyperv` passing
as a reference to `arch::generate_common_cpuid()`, so acquiring the same
lock again while calling to the same function is a deadlock.

Fixes: 3793ffe888

Reported-by: Yi Wang <foxywang@tencent.com>
Signed-off-by: Bo Chen <chen.bo@intel.com>
(cherry picked from commit aa6e83126c)
This commit is contained in:
Bo Chen 2023-10-16 11:04:17 -07:00 committed by Bo Chen
parent ab18a923f1
commit 77634a3c05
1 changed files with 3 additions and 1 deletions
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4
vmm/src/lib.rs
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@ -1471,6 +1471,8 @@ impl Vmm {
let vm_config = vm.get_config();
#[cfg(all(feature = "kvm", target_arch = "x86_64"))]
let common_cpuid = {
#[cfg(feature = "tdx")]
let tdx_enabled = vm_config.lock().unwrap().is_tdx_enabled();
let phys_bits = vm::physical_bits(vm_config.lock().unwrap().cpus.max_phys_bits);
arch::generate_common_cpuid(
hypervisor,
@ -1479,7 +1481,7 @@ impl Vmm {
phys_bits,
vm_config.lock().unwrap().cpus.kvm_hyperv,
#[cfg(feature = "tdx")]
vm_config.lock().unwrap().is_tdx_enabled(),
tdx_enabled,
)
.map_err(|e| {
MigratableError::MigrateReceive(anyhow!("Error generating common cpuid': {:?}", e))