Commit 58ddfe6c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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

Pull kvm fixes from Paolo Bonzini:

 - ARM/ARM64 locking fixes

 - x86 fixes: PCID, UMIP, locking

 - improved support for recent Windows version that have a 2048 Hz APIC
   timer

 - rename KVM_HINTS_DEDICATED CPUID bit to KVM_HINTS_REALTIME

 - better behaved selftests

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  kvm: rename KVM_HINTS_DEDICATED to KVM_HINTS_REALTIME
  KVM: arm/arm64: VGIC/ITS save/restore: protect kvm_read_guest() calls
  KVM: arm/arm64: VGIC/ITS: protect kvm_read_guest() calls with SRCU lock
  KVM: arm/arm64: VGIC/ITS: Promote irq_lock() in update_affinity
  KVM: arm/arm64: Properly protect VGIC locks from IRQs
  KVM: X86: Lower the default timer frequency limit to 200us
  KVM: vmx: update sec exec controls for UMIP iff emulating UMIP
  kvm: x86: Suppress CR3_PCID_INVD bit only when PCIDs are enabled
  KVM: selftests: exit with 0 status code when tests cannot be run
  KVM: hyperv: idr_find needs RCU protection
  x86: Delay skip of emulated hypercall instruction
  KVM: Extend MAX_IRQ_ROUTES to 4096 for all archs
parents 7c9a0fc7 633711e8

Documentation/virtual/kvm/cpuid.txt

+3 −3
Original line number Diff line number Diff line
@@ -72,8 +72,8 @@ KVM_FEATURE_CLOCKSOURCE_STABLE_BIT || 24 || host will warn if no guest-side 


flag                               || value || meaning

==================================================================================

KVM_HINTS_DEDICATED                ||     0 || guest checks this feature bit to

                                   ||       || determine if there is vCPU pinning

                                   ||       || and there is no vCPU over-commitment,

KVM_HINTS_REALTIME                 ||     0 || guest checks this feature bit to

                                   ||       || determine that vCPUs are never

                                   ||       || preempted for an unlimited time,

                                   ||       || allowing optimizations

----------------------------------------------------------------------------------

arch/arm/include/asm/kvm_mmu.h

+16 −0
Original line number Diff line number Diff line
@@ -309,6 +309,22 @@ static inline unsigned int kvm_get_vmid_bits(void) 
	return 8;

}



/*

 * We are not in the kvm->srcu critical section most of the time, so we take

 * the SRCU read lock here. Since we copy the data from the user page, we

 * can immediately drop the lock again.

 */

static inline int kvm_read_guest_lock(struct kvm *kvm,

				      gpa_t gpa, void *data, unsigned long len)

{

	int srcu_idx = srcu_read_lock(&kvm->srcu);

	int ret = kvm_read_guest(kvm, gpa, data, len);



	srcu_read_unlock(&kvm->srcu, srcu_idx);



	return ret;

}



static inline void *kvm_get_hyp_vector(void)

{

	return kvm_ksym_ref(__kvm_hyp_vector);

arch/arm64/include/asm/kvm_mmu.h

+16 −0
Original line number Diff line number Diff line
@@ -360,6 +360,22 @@ static inline unsigned int kvm_get_vmid_bits(void) 
	return (cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR1_VMIDBITS_SHIFT) == 2) ? 16 : 8;

}



/*

 * We are not in the kvm->srcu critical section most of the time, so we take

 * the SRCU read lock here. Since we copy the data from the user page, we

 * can immediately drop the lock again.

 */

static inline int kvm_read_guest_lock(struct kvm *kvm,

				      gpa_t gpa, void *data, unsigned long len)

{

	int srcu_idx = srcu_read_lock(&kvm->srcu);

	int ret = kvm_read_guest(kvm, gpa, data, len);



	srcu_read_unlock(&kvm->srcu, srcu_idx);



	return ret;

}



#ifdef CONFIG_KVM_INDIRECT_VECTORS

/*

 * EL2 vectors can be mapped and rerouted in a number of ways,

arch/x86/include/uapi/asm/kvm_para.h

+1 −1
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ 
#define KVM_FEATURE_PV_TLB_FLUSH	9

#define KVM_FEATURE_ASYNC_PF_VMEXIT	10



#define KVM_HINTS_DEDICATED      0

#define KVM_HINTS_REALTIME      0



/* The last 8 bits are used to indicate how to interpret the flags field

 * in pvclock structure. If no bits are set, all flags are ignored.

arch/x86/kernel/kvm.c

+4 −4
Original line number Diff line number Diff line
@@ -457,7 +457,7 @@ static void __init sev_map_percpu_data(void) 
static void __init kvm_smp_prepare_cpus(unsigned int max_cpus)

{

	native_smp_prepare_cpus(max_cpus);

	if (kvm_para_has_hint(KVM_HINTS_DEDICATED))

	if (kvm_para_has_hint(KVM_HINTS_REALTIME))

		static_branch_disable(&virt_spin_lock_key);

}
@@ -553,7 +553,7 @@ static void __init kvm_guest_init(void) 
	}



	if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&

	    !kvm_para_has_hint(KVM_HINTS_DEDICATED) &&

	    !kvm_para_has_hint(KVM_HINTS_REALTIME) &&

	    kvm_para_has_feature(KVM_FEATURE_STEAL_TIME))

		pv_mmu_ops.flush_tlb_others = kvm_flush_tlb_others;
@@ -649,7 +649,7 @@ static __init int kvm_setup_pv_tlb_flush(void) 
	int cpu;



	if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&

	    !kvm_para_has_hint(KVM_HINTS_DEDICATED) &&

	    !kvm_para_has_hint(KVM_HINTS_REALTIME) &&

	    kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {

		for_each_possible_cpu(cpu) {

			zalloc_cpumask_var_node(per_cpu_ptr(&__pv_tlb_mask, cpu),
@@ -745,7 +745,7 @@ void __init kvm_spinlock_init(void) 
	if (!kvm_para_has_feature(KVM_FEATURE_PV_UNHALT))

		return;



	if (kvm_para_has_hint(KVM_HINTS_DEDICATED))

	if (kvm_para_has_hint(KVM_HINTS_REALTIME))

		return;



	__pv_init_lock_hash();

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