diff options
Diffstat (limited to 'pkg/sentry/platform')
| -rw-r--r-- | pkg/sentry/platform/kvm/machine.go | 18 | ||||
| -rw-r--r-- | pkg/sentry/platform/ring0/pagetables/BUILD | 2 |
2 files changed, 18 insertions, 2 deletions
diff --git a/pkg/sentry/platform/kvm/machine.go b/pkg/sentry/platform/kvm/machine.go index 8076c7529..f1afc74dc 100644 --- a/pkg/sentry/platform/kvm/machine.go +++ b/pkg/sentry/platform/kvm/machine.go @@ -329,10 +329,12 @@ func (m *machine) Destroy() { } // Get gets an available vCPU. +// +// This will return with the OS thread locked. func (m *machine) Get() *vCPU { + m.mu.RLock() runtime.LockOSThread() tid := procid.Current() - m.mu.RLock() // Check for an exact match. if c := m.vCPUs[tid]; c != nil { @@ -343,8 +345,22 @@ func (m *machine) Get() *vCPU { // The happy path failed. We now proceed to acquire an exclusive lock // (because the vCPU map may change), and scan all available vCPUs. + // In this case, we first unlock the OS thread. Otherwise, if mu is + // not available, the current system thread will be parked and a new + // system thread spawned. We avoid this situation by simply refreshing + // tid after relocking the system thread. m.mu.RUnlock() + runtime.UnlockOSThread() m.mu.Lock() + runtime.LockOSThread() + tid = procid.Current() + + // Recheck for an exact match. + if c := m.vCPUs[tid]; c != nil { + c.lock() + m.mu.Unlock() + return c + } for { // Scan for an available vCPU. diff --git a/pkg/sentry/platform/ring0/pagetables/BUILD b/pkg/sentry/platform/ring0/pagetables/BUILD index 971eed7fa..4f2406ce3 100644 --- a/pkg/sentry/platform/ring0/pagetables/BUILD +++ b/pkg/sentry/platform/ring0/pagetables/BUILD @@ -7,7 +7,7 @@ go_template( name = "generic_walker", srcs = select_arch( amd64 = ["walker_amd64.go"], - arm64 = ["walker_amd64.go"], + arm64 = ["walker_arm64.go"], ), opt_types = [ "Visitor", |