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vmm: only use KVM_ARM_VCPU_PMU_V3 if available

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Having PMU in guests isn't critical, and not all hardware supports
it (e.g. Apple Silicon).

CpuManager::init_pmu already has a fallback for if PMU is not
supported by the VCPU, but we weren't getting that far, because we
would always try to initialise the VCPU with KVM_ARM_VCPU_PMU_V3, and
then bail when it returned with EINVAL.

Signed-off-by: Alyssa Ross <hi@alyssa.is>
This commit is contained in:
Alyssa Ross 2023-04-10 11:11:46 +00:00 committed by Bo Chen
parent 0aa858c266
commit 4485210de5
4 changed files with 13 additions and 4 deletions
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3
Cargo.lock generated
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@ -545,8 +545,7 @@ dependencies = [
[[package]]
name = "kvm-ioctls"
version = "0.13.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b8f8dc9c1896e5f144ec5d07169bc29f39a047686d29585a91f30489abfaeb6b"
source = "git+https://github.com/rust-vmm/kvm-ioctls?branch=main#23a3bb045a467e60bb00328a0b13cea13b5815d0"
dependencies = [
"kvm-bindings",
"libc",

1
Cargo.toml
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@ -52,6 +52,7 @@ vm-memory = "0.10.0"
# List of patched crates
[patch.crates-io]
kvm-bindings = { git = "https://github.com/cloud-hypervisor/kvm-bindings", branch = "ch-v0.6.0-tdx" }
kvm-ioctls = { git = "https://github.com/rust-vmm/kvm-ioctls", branch = "main" }
versionize_derive = { git = "https://github.com/cloud-hypervisor/versionize_derive", branch = "ch" }
[dev-dependencies]

2
hypervisor/src/kvm/mod.rs
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@ -330,7 +330,7 @@ impl KvmVm {
Ok(VfioDeviceFd::new_from_kvm(device_fd))
}
/// Checks if a particular `Cap` is available.
fn check_extension(&self, c: Cap) -> bool {
pub fn check_extension(&self, c: Cap) -> bool {
self.fd.check_extension(c)
}
}

11
vmm/src/cpu.rs
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@ -52,6 +52,8 @@ use hypervisor::arch::x86::MsrEntry;
use hypervisor::arch::x86::{SpecialRegisters, StandardRegisters};
#[cfg(target_arch = "aarch64")]
use hypervisor::kvm::kvm_bindings;
#[cfg(all(target_arch = "aarch64", feature = "kvm"))]
use hypervisor::kvm::kvm_ioctls::Cap;
#[cfg(feature = "tdx")]
use hypervisor::kvm::{TdxExitDetails, TdxExitStatus};
use hypervisor::{CpuState, HypervisorCpuError, HypervisorType, VmExit, VmOps};
@ -370,7 +372,14 @@ impl Vcpu {
.map_err(Error::VcpuArmPreferredTarget)?;
// We already checked that the capability is supported.
kvi.features[0] |= 1 << kvm_bindings::KVM_ARM_VCPU_PSCI_0_2;
kvi.features[0] |= 1 << kvm_bindings::KVM_ARM_VCPU_PMU_V3;
if vm
.as_any()
.downcast_ref::<hypervisor::kvm::KvmVm>()
.unwrap()
.check_extension(Cap::ArmPmuV3)
{
kvi.features[0] |= 1 << kvm_bindings::KVM_ARM_VCPU_PMU_V3;
}
// Non-boot cpus are powered off initially.
if self.id > 0 {
kvi.features[0] |= 1 << kvm_bindings::KVM_ARM_VCPU_POWER_OFF;