diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-06 09:18:21 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-06 09:18:21 -0400 |
commit | 80fac0f577a35c437219a2786c1804ab8ca1e998 (patch) | |
tree | dfe87e66f937b2b42ba6b87c4538b7e5bea06d07 /arch/x86/include | |
parent | 4305f42401b29e2e024bd064618faf25aef5cb69 (diff) | |
parent | 45e11817d5703eceb65a673927a8bc74dc1286d6 (diff) |
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull more KVM updates from Paolo Bonzini:
- ARM bugfix and MSI injection support
- x86 nested virt tweak and OOPS fix
- Simplify pvclock code (vdso bits acked by Andy Lutomirski).
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
nvmx: mark ept single context invalidation as supported
nvmx: remove comment about missing nested vpid support
KVM: lapic: fix access preemption timer stuff even if kernel_irqchip=off
KVM: documentation: fix KVM_CAP_X2APIC_API information
x86: vdso: use __pvclock_read_cycles
pvclock: introduce seqcount-like API
arm64: KVM: Set cpsr before spsr on fault injection
KVM: arm: vgic-irqfd: Workaround changing kvm_set_routing_entry prototype
KVM: arm/arm64: Enable MSI routing
KVM: arm/arm64: Enable irqchip routing
KVM: Move kvm_setup_default/empty_irq_routing declaration in arch specific header
KVM: irqchip: Convey devid to kvm_set_msi
KVM: Add devid in kvm_kernel_irq_routing_entry
KVM: api: Pass the devid in the msi routing entry
Diffstat (limited to 'arch/x86/include')
-rw-r--r-- | arch/x86/include/asm/pvclock.h | 39 |
1 files changed, 23 insertions, 16 deletions
diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index 7c1c89598688..d019f0cc80ec 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -25,6 +25,24 @@ void pvclock_resume(void); void pvclock_touch_watchdogs(void); +static __always_inline +unsigned pvclock_read_begin(const struct pvclock_vcpu_time_info *src) +{ + unsigned version = src->version & ~1; + /* Make sure that the version is read before the data. */ + virt_rmb(); + return version; +} + +static __always_inline +bool pvclock_read_retry(const struct pvclock_vcpu_time_info *src, + unsigned version) +{ + /* Make sure that the version is re-read after the data. */ + virt_rmb(); + return unlikely(version != src->version); +} + /* * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction, * yielding a 64-bit result. @@ -69,23 +87,12 @@ static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift) } static __always_inline -unsigned __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src, - cycle_t *cycles, u8 *flags) +cycle_t __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src) { - unsigned version; - cycle_t offset; - u64 delta; - - version = src->version; - /* Make the latest version visible */ - smp_rmb(); - - delta = rdtsc_ordered() - src->tsc_timestamp; - offset = pvclock_scale_delta(delta, src->tsc_to_system_mul, - src->tsc_shift); - *cycles = src->system_time + offset; - *flags = src->flags; - return version; + u64 delta = rdtsc_ordered() - src->tsc_timestamp; + cycle_t offset = pvclock_scale_delta(delta, src->tsc_to_system_mul, + src->tsc_shift); + return src->system_time + offset; } struct pvclock_vsyscall_time_info { |