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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Browse Source 
Pull kvm updates from Paolo Bonzini:
 "ARM:
   - Move the arch-specific code into arch/arm64/kvm

   - Start the post-32bit cleanup

   - Cherry-pick a few non-invasive pre-NV patches

  x86:
   - Rework of TLB flushing

   - Rework of event injection, especially with respect to nested
     virtualization

   - Nested AMD event injection facelift, building on the rework of
     generic code and fixing a lot of corner cases

   - Nested AMD live migration support

   - Optimization for TSC deadline MSR writes and IPIs

   - Various cleanups

   - Asynchronous page fault cleanups (from tglx, common topic branch
     with tip tree)

   - Interrupt-based delivery of asynchronous "page ready" events (host
     side)

   - Hyper-V MSRs and hypercalls for guest debugging

   - VMX preemption timer fixes

  s390:
   - Cleanups

  Generic:
   - switch vCPU thread wakeup from swait to rcuwait

  The other architectures, and the guest side of the asynchronous page
  fault work, will come next week"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (256 commits)
  KVM: selftests: fix rdtsc() for vmx_tsc_adjust_test
  KVM: check userspace_addr for all memslots
  KVM: selftests: update hyperv_cpuid with SynDBG tests
  x86/kvm/hyper-v: Add support for synthetic debugger via hypercalls
  x86/kvm/hyper-v: enable hypercalls regardless of hypercall page
  x86/kvm/hyper-v: Add support for synthetic debugger interface
  x86/hyper-v: Add synthetic debugger definitions
  KVM: selftests: VMX preemption timer migration test
  KVM: nVMX: Fix VMX preemption timer migration
  x86/kvm/hyper-v: Explicitly align hcall param for kvm_hyperv_exit
  KVM: x86/pmu: Support full width counting
  KVM: x86/pmu: Tweak kvm_pmu_get_msr to pass 'struct msr_data' in
  KVM: x86: announce KVM_FEATURE_ASYNC_PF_INT
  KVM: x86: acknowledgment mechanism for async pf page ready notifications
  KVM: x86: interrupt based APF 'page ready' event delivery
  KVM: introduce kvm_read_guest_offset_cached()
  KVM: rename kvm_arch_can_inject_async_page_present() to kvm_arch_can_dequeue_async_page_present()
  KVM: x86: extend struct kvm_vcpu_pv_apf_data with token info
  Revert "KVM: async_pf: Fix #DF due to inject "Page not Present" and "Page Ready" exceptions simultaneously"
  KVM: VMX: Replace zero-length array with flexible-array
  ...
This commit is contained in:
Linus Torvalds
2020-06-03 15:13:47 -07:00
parent 6b2591c212 13ffbd8db1
commit 039aeb9deb
155 changed files with 5318 additions and 3057 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
kernel/exit.c
View File

@@ -228,8 +228,9 @@ repeat:
goto repeat;
}
void rcuwait_wake_up(struct rcuwait *w)
int rcuwait_wake_up(struct rcuwait *w)
{
int ret = 0;
struct task_struct *task;
rcu_read_lock();
@@ -237,7 +238,7 @@ void rcuwait_wake_up(struct rcuwait *w)
/*
* Order condition vs @task, such that everything prior to the load
* of @task is visible. This is the condition as to why the user called
* rcuwait_trywake() in the first place. Pairs with set_current_state()
* rcuwait_wake() in the first place. Pairs with set_current_state()
* barrier (A) in rcuwait_wait_event().
*
* WAIT WAKE
@@ -249,8 +250,10 @@ void rcuwait_wake_up(struct rcuwait *w)
task = rcu_dereference(w->task);
if (task)
wake_up_process(task);
ret = wake_up_process(task);
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL_GPL(rcuwait_wake_up);

86
kernel/locking/lockdep.c
View File

@@ -3616,13 +3616,10 @@ mark_held_locks(struct task_struct *curr, enum lock_usage_bit base_bit)
/*
* Hardirqs will be enabled:
*/
static void __trace_hardirqs_on_caller(unsigned long ip)
static void __trace_hardirqs_on_caller(void)
{
struct task_struct *curr = current;
/* we'll do an OFF -> ON transition: */
curr->hardirqs_enabled = 1;
/*
* We are going to turn hardirqs on, so set the
* usage bit for all held locks:
@@ -3635,15 +3632,19 @@ static void __trace_hardirqs_on_caller(unsigned long ip)
* this bit from being set before)
*/
if (curr->softirqs_enabled)
if (!mark_held_locks(curr, LOCK_ENABLED_SOFTIRQ))
return;
curr->hardirq_enable_ip = ip;
curr->hardirq_enable_event = ++curr->irq_events;
debug_atomic_inc(hardirqs_on_events);
mark_held_locks(curr, LOCK_ENABLED_SOFTIRQ);
}
void lockdep_hardirqs_on(unsigned long ip)
/**
* lockdep_hardirqs_on_prepare - Prepare for enabling interrupts
* @ip: Caller address
*
* Invoked before a possible transition to RCU idle from exit to user or
* guest mode. This ensures that all RCU operations are done before RCU
* stops watching. After the RCU transition lockdep_hardirqs_on() has to be
* invoked to set the final state.
*/
void lockdep_hardirqs_on_prepare(unsigned long ip)
{
if (unlikely(!debug_locks || current->lockdep_recursion))
return;
@@ -3679,20 +3680,62 @@ void lockdep_hardirqs_on(unsigned long ip)
if (DEBUG_LOCKS_WARN_ON(current->hardirq_context))
return;
current->hardirq_chain_key = current->curr_chain_key;
current->lockdep_recursion++;
__trace_hardirqs_on_caller(ip);
__trace_hardirqs_on_caller();
lockdep_recursion_finish();
}
NOKPROBE_SYMBOL(lockdep_hardirqs_on);
EXPORT_SYMBOL_GPL(lockdep_hardirqs_on_prepare);
void noinstr lockdep_hardirqs_on(unsigned long ip)
{
struct task_struct *curr = current;
if (unlikely(!debug_locks || curr->lockdep_recursion))
return;
if (curr->hardirqs_enabled) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
* in a stat is not a big deal.
*/
__debug_atomic_inc(redundant_hardirqs_on);
return;
}
/*
* We're enabling irqs and according to our state above irqs weren't
* already enabled, yet we find the hardware thinks they are in fact
* enabled.. someone messed up their IRQ state tracing.
*/
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
return;
/*
* Ensure the lock stack remained unchanged between
* lockdep_hardirqs_on_prepare() and lockdep_hardirqs_on().
*/
DEBUG_LOCKS_WARN_ON(current->hardirq_chain_key !=
current->curr_chain_key);
/* we'll do an OFF -> ON transition: */
curr->hardirqs_enabled = 1;
curr->hardirq_enable_ip = ip;
curr->hardirq_enable_event = ++curr->irq_events;
debug_atomic_inc(hardirqs_on_events);
}
EXPORT_SYMBOL_GPL(lockdep_hardirqs_on);
/*
* Hardirqs were disabled:
*/
void lockdep_hardirqs_off(unsigned long ip)
void noinstr lockdep_hardirqs_off(unsigned long ip)
{
struct task_struct *curr = current;
if (unlikely(!debug_locks || current->lockdep_recursion))
if (unlikely(!debug_locks || curr->lockdep_recursion))
return;
/*
@@ -3710,10 +3753,11 @@ void lockdep_hardirqs_off(unsigned long ip)
curr->hardirq_disable_ip = ip;
curr->hardirq_disable_event = ++curr->irq_events;
debug_atomic_inc(hardirqs_off_events);
} else
} else {
debug_atomic_inc(redundant_hardirqs_off);
}
}
NOKPROBE_SYMBOL(lockdep_hardirqs_off);
EXPORT_SYMBOL_GPL(lockdep_hardirqs_off);
/*
* Softirqs will be enabled:
@@ -4389,8 +4433,8 @@ static void print_unlock_imbalance_bug(struct task_struct *curr,
dump_stack();
}
static int match_held_lock(const struct held_lock *hlock,
const struct lockdep_map *lock)
static noinstr int match_held_lock(const struct held_lock *hlock,
const struct lockdep_map *lock)
{
if (hlock->instance == lock)
return 1;
@@ -4677,7 +4721,7 @@ __lock_release(struct lockdep_map *lock, unsigned long ip)
return 0;
}
static nokprobe_inline
static __always_inline
int __lock_is_held(const struct lockdep_map *lock, int read)
{
struct task_struct *curr = current;
@@ -4937,7 +4981,7 @@ void lock_release(struct lockdep_map *lock, unsigned long ip)
}
EXPORT_SYMBOL_GPL(lock_release);
int lock_is_held_type(const struct lockdep_map *lock, int read)
noinstr int lock_is_held_type(const struct lockdep_map *lock, int read)
{
unsigned long flags;
int ret = 0;

39
kernel/trace/trace_preemptirq.c
View File

@@ -19,6 +19,24 @@
/* Per-cpu variable to prevent redundant calls when IRQs already off */
static DEFINE_PER_CPU(int, tracing_irq_cpu);
/*
* Like trace_hardirqs_on() but without the lockdep invocation. This is
* used in the low level entry code where the ordering vs. RCU is important
* and lockdep uses a staged approach which splits the lockdep hardirq
* tracking into a RCU on and a RCU off section.
*/
void trace_hardirqs_on_prepare(void)
{
if (this_cpu_read(tracing_irq_cpu)) {
if (!in_nmi())
trace_irq_enable(CALLER_ADDR0, CALLER_ADDR1);
tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
this_cpu_write(tracing_irq_cpu, 0);
}
}
EXPORT_SYMBOL(trace_hardirqs_on_prepare);
NOKPROBE_SYMBOL(trace_hardirqs_on_prepare);
void trace_hardirqs_on(void)
{
if (this_cpu_read(tracing_irq_cpu)) {
@@ -28,11 +46,31 @@ void trace_hardirqs_on(void)
this_cpu_write(tracing_irq_cpu, 0);
}
lockdep_hardirqs_on_prepare(CALLER_ADDR0);
lockdep_hardirqs_on(CALLER_ADDR0);
}
EXPORT_SYMBOL(trace_hardirqs_on);
NOKPROBE_SYMBOL(trace_hardirqs_on);
/*
* Like trace_hardirqs_off() but without the lockdep invocation. This is
* used in the low level entry code where the ordering vs. RCU is important
* and lockdep uses a staged approach which splits the lockdep hardirq
* tracking into a RCU on and a RCU off section.
*/
void trace_hardirqs_off_prepare(void)
{
if (!this_cpu_read(tracing_irq_cpu)) {
this_cpu_write(tracing_irq_cpu, 1);
tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
if (!in_nmi())
trace_irq_disable(CALLER_ADDR0, CALLER_ADDR1);
}
}
EXPORT_SYMBOL(trace_hardirqs_off_prepare);
NOKPROBE_SYMBOL(trace_hardirqs_off_prepare);
void trace_hardirqs_off(void)
{
if (!this_cpu_read(tracing_irq_cpu)) {
@@ -56,6 +94,7 @@ __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
this_cpu_write(tracing_irq_cpu, 0);
}
lockdep_hardirqs_on_prepare(CALLER_ADDR0);
lockdep_hardirqs_on(CALLER_ADDR0);
}
EXPORT_SYMBOL(trace_hardirqs_on_caller);