cmdline: add --no-pmu option

Add option to not use the advertised PMU for the VM.

BUG=b:360388014
TEST=boot VM on Android with --no-pmu

Change-Id: I4e614915371bb55337471023a2cc062f58e6c4ee
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5937867
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Auto-Submit: Elie Kheirallah <khei@google.com>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>

aarch64/src/lib.rs

@@ -439,6 +439,7 @@ impl arch::LinuxArch for AArch64 {
         _guest_suspended_cvar: Option<Arc<(Mutex<bool>, Condvar)>>,
         device_tree_overlays: Vec<DtbOverlay>,
         fdt_position: Option<FdtPosition>,
+        no_pmu: bool,
     ) -> std::result::Result<RunnableLinuxVm<V, Vcpu>, Self::Error>
     where
         V: VmAArch64,
@@ -524,6 +525,7 @@ impl arch::LinuxArch for AArch64 {
         let mut use_pmu = vm
             .get_hypervisor()
             .check_capability(HypervisorCap::ArmPmuV3);
+        use_pmu &= !no_pmu;
         let vcpu_count = components.vcpu_count;
         let mut has_pvtime = true;
         let mut vcpus = Vec::with_capacity(vcpu_count);

arch/src/lib.rs

@@ -496,6 +496,7 @@ pub trait LinuxArch {
         guest_suspended_cvar: Option<Arc<(Mutex<bool>, Condvar)>>,
         device_tree_overlays: Vec<DtbOverlay>,
         fdt_position: Option<FdtPosition>,
+        no_pmu: bool,
     ) -> std::result::Result<RunnableLinuxVm<V, Vcpu>, Self::Error>
     where
         V: VmArch,

riscv64/src/lib.rs

@@ -198,6 +198,7 @@ impl arch::LinuxArch for Riscv64 {
         _guest_suspended_cvar: Option<Arc<(Mutex<bool>, Condvar)>>,
         device_tree_overlays: Vec<DtbOverlay>,
         fdt_position: Option<FdtPosition>,
+        _no_pmu: bool,
     ) -> std::result::Result<RunnableLinuxVm<V, Vcpu>, Self::Error>
     where
         V: VmRiscv64,

src/crosvm/cmdline.rs

@@ -1711,6 +1711,13 @@ pub struct RunCommand {
     /// don't use legacy KBD devices emulation
     pub no_i8042: Option<bool>,
 
+    #[cfg(target_arch = "aarch64")]
+    #[argh(switch)]
+    #[serde(skip)] // TODO(b/255223604)
+    #[merge(strategy = overwrite_option)]
+    /// disable Performance Monitor Unit (PMU)
+    pub no_pmu: Option<bool>,
+
     #[argh(switch)]
     #[serde(skip)] // TODO(b/255223604)
     #[merge(strategy = overwrite_option)]
@@ -2799,6 +2806,7 @@ impl TryFrom<RunCommand> for super::config::Config {
                 );
             }
             cfg.mte = cmd.mte.unwrap_or_default();
+            cfg.no_pmu = cmd.no_pmu.unwrap_or_default();
             cfg.swiotlb = cmd.swiotlb;
         }
 

src/crosvm/config.rs

@@ -827,6 +827,7 @@ pub struct Config {
     #[cfg(windows)]
     pub net_vhost_user_tube: Option<Tube>,
     pub no_i8042: bool,
+    pub no_pmu: bool,
     pub no_rtc: bool,
     pub no_smt: bool,
     pub params: Vec<String>,
@@ -1054,6 +1055,7 @@ impl Default for Config {
             #[cfg(windows)]
             net_vhost_user_tube: None,
             no_i8042: false,
+            no_pmu: false,
             no_rtc: false,
             no_smt: false,
             params: Vec::new(),

src/crosvm/sys/linux.rs

@@ -2125,6 +2125,7 @@ where
         guest_suspended_cvar.clone(),
         dt_overlays,
         cfg.fdt_position,
+        cfg.no_pmu,
     )
     .context("the architecture failed to build the vm")?;
 

src/sys/windows.rs

@@ -2658,6 +2658,7 @@ where
         /* guest_suspended_cvar= */ None,
         dt_overlays,
         cfg.fdt_position,
+        cfg.no_pmu,
     )
     .exit_context(Exit::BuildVm, "the architecture failed to build the vm")?;
 

x86_64/src/lib.rs

@@ -819,6 +819,7 @@ impl arch::LinuxArch for X8664arch {
         guest_suspended_cvar: Option<Arc<(Mutex<bool>, Condvar)>>,
         device_tree_overlays: Vec<DtbOverlay>,
         _fdt_position: Option<FdtPosition>,
+        _no_pmu: bool,
     ) -> std::result::Result<RunnableLinuxVm<V, Vcpu>, Self::Error>
     where
         V: VmX86_64,