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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2011-02-04 10:49:11 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-03-17 13:08:30 -0300 |
| commit | 038f8c110eace38d7598e271835ae96ad04a3a26 (patch) | |
| tree | 0b95a2c07fb2331110f4741d9d54ebfcf42283a8 /arch/x86 | |
| parent | 7049467b5383432e178cc4124e53aebd83638916 (diff) | |
| download | linux-038f8c110eace38d7598e271835ae96ad04a3a26.tar.gz linux-038f8c110eace38d7598e271835ae96ad04a3a26.tar.bz2 linux-038f8c110eace38d7598e271835ae96ad04a3a26.zip | |
KVM: x86: Convert tsc_write_lock to raw_spinlock
Code under this lock requires non-preemptibility. Ensure this also over
-rt by converting it to raw spinlock.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 6 |
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index a58aebef5188..37bd730ff852 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -448,7 +448,7 @@ struct kvm_arch { unsigned long irq_sources_bitmap; s64 kvmclock_offset; - spinlock_t tsc_write_lock; + raw_spinlock_t tsc_write_lock; u64 last_tsc_nsec; u64 last_tsc_offset; u64 last_tsc_write; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9000829d06cb..17af71da63ad 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1017,7 +1017,7 @@ void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data) unsigned long flags; s64 sdiff; - spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); + raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); offset = data - native_read_tsc(); ns = get_kernel_ns(); elapsed = ns - kvm->arch.last_tsc_nsec; @@ -1050,7 +1050,7 @@ void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data) kvm->arch.last_tsc_write = data; kvm->arch.last_tsc_offset = offset; kvm_x86_ops->write_tsc_offset(vcpu, offset); - spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags); + raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags); /* Reset of TSC must disable overshoot protection below */ vcpu->arch.hv_clock.tsc_timestamp = 0; @@ -6004,7 +6004,7 @@ int kvm_arch_init_vm(struct kvm *kvm) /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); - spin_lock_init(&kvm->arch.tsc_write_lock); + raw_spin_lock_init(&kvm->arch.tsc_write_lock); return 0; } |