search for: smp_yield_cpu

...ted(int cpu) > { > - return pcpu_running(pcpu_devices + cpu); > + if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu)) > + return false; > + if (pcpu_running(pcpu_devices + cpu)) > + return false; > + return true; > } > +EXPORT_SYMBOL(arch_vcpu_is_preempted); > > void smp_yield_cpu(int cpu) > { > diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c > index e5f50a7..e48a48e 100644 > --- a/arch/s390/lib/spinlock.c > +++ b/arch/s390/lib/spinlock.c > @@ -37,15 +37,6 @@ static inline void _raw_compare_and_delay(unsigned int *lock, unsigned int old) &...

...ted(int cpu) > { > - return pcpu_running(pcpu_devices + cpu); > + if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu)) > + return false; > + if (pcpu_running(pcpu_devices + cpu)) > + return false; > + return true; > } > +EXPORT_SYMBOL(arch_vcpu_is_preempted); > > void smp_yield_cpu(int cpu) > { > diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c > index e5f50a7..e48a48e 100644 > --- a/arch/s390/lib/spinlock.c > +++ b/arch/s390/lib/spinlock.c > @@ -37,15 +37,6 @@ static inline void _raw_compare_and_delay(unsigned int *lock, unsigned int old) &...

...smp_vcpu_scheduled(int cpu) +bool arch_vcpu_is_preempted(int cpu) { - return pcpu_running(pcpu_devices + cpu); + if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu)) + return false; + if (pcpu_running(pcpu_devices + cpu)) + return false; + return true; } +EXPORT_SYMBOL(arch_vcpu_is_preempted); void smp_yield_cpu(int cpu) { diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c index e5f50a7..e48a48e 100644 --- a/arch/s390/lib/spinlock.c +++ b/arch/s390/lib/spinlock.c @@ -37,15 +37,6 @@ static inline void _raw_compare_and_delay(unsigned int *lock, unsigned int old) asm(".insn rsy,0xeb00000...

...smp_vcpu_scheduled(int cpu) +bool arch_vcpu_is_preempted(int cpu) { - return pcpu_running(pcpu_devices + cpu); + if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu)) + return false; + if (pcpu_running(pcpu_devices + cpu)) + return false; + return true; } +EXPORT_SYMBOL(arch_vcpu_is_preempted); void smp_yield_cpu(int cpu) { diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c index e5f50a7..e48a48e 100644 --- a/arch/s390/lib/spinlock.c +++ b/arch/s390/lib/spinlock.c @@ -37,15 +37,6 @@ static inline void _raw_compare_and_delay(unsigned int *lock, unsigned int old) asm(".insn rsy,0xeb00000...

change from v4: spilt x86 kvm vcpu preempted check into two patches. add documentation patch. add x86 vcpu preempted check patch under xen add s390 vcpu preempted check patch change from v3: add x86 vcpu preempted check patch change from v2: no code change, fix typos, update some comments change from v1: a simplier definition of default vcpu_is_preempted skip mahcine type check on ppc,

change from v4: spilt x86 kvm vcpu preempted check into two patches. add documentation patch. add x86 vcpu preempted check patch under xen add s390 vcpu preempted check patch change from v3: add x86 vcpu preempted check patch change from v2: no code change, fix typos, update some comments change from v1: a simplier definition of default vcpu_is_preempted skip mahcine type check on ppc,

change from v6: fix typos and remove uncessary comments. change from v5: spilt x86/kvm patch into guest/host part. introduce kvm_write_guest_offset_cached. fix some typos. rebase patch onto 4.9.2 change from v4: spilt x86 kvm vcpu preempted check into two patches. add documentation patch. add x86 vcpu preempted check patch under xen add s390 vcpu preempted check patch change from v3:

change from v6: fix typos and remove uncessary comments. change from v5: spilt x86/kvm patch into guest/host part. introduce kvm_write_guest_offset_cached. fix some typos. rebase patch onto 4.9.2 change from v4: spilt x86 kvm vcpu preempted check into two patches. add documentation patch. add x86 vcpu preempted check patch under xen add s390 vcpu preempted check patch change from v3:

change from v5: spilt x86/kvm patch into guest/host part. introduce kvm_write_guest_offset_cached. fix some typos. rebase patch onto 4.9.2 change from v4: spilt x86 kvm vcpu preempted check into two patches. add documentation patch. add x86 vcpu preempted check patch under xen add s390 vcpu preempted check patch change from v3: add x86 vcpu preempted check patch change from v2: no code

change from v5: spilt x86/kvm patch into guest/host part. introduce kvm_write_guest_offset_cached. fix some typos. rebase patch onto 4.9.2 change from v4: spilt x86 kvm vcpu preempted check into two patches. add documentation patch. add x86 vcpu preempted check patch under xen add s390 vcpu preempted check patch change from v3: add x86 vcpu preempted check patch change from v2: no code

...will hang the guest. Seems to be a deadlock in the virtio-ccw code. We seem to call the config code in the interrupt handler. crash> bt PID: 0 TASK: d9a400 CPU: 0 COMMAND: "swapper/0" LOWCORE INFO: -psw : 0x0404c00180000000 0x0000000000116472 -function : smp_yield_cpu at 116472 -prefix : 0x7fffc000 -cpu timer: 0x7fffffcc8c0af5be -clock cmp: 0x720a4e4002831000 -general registers: 000000000000000000 000000000000000000 0x000000000000009c 0x0000000000fac2b0 0x0000000000000015 0xffffffffffffffe2 0x000003e000100000 0x0000000000000001...

Some vqs don't need to be allocated when the related feature bits are disabled. Callers notice the vq allocation layer by setting the related names[i] to be NULL. This patch series fixes the find_vqs implementations to handle this case. Wei Wang (2): virtio_pci: use queue idx instead of array idx to set up the vq virtio: don't allocate vqs when names[i] = NULL

Some vqs don't need to be allocated when the related feature bits are disabled. Callers notice the vq allocation layer by setting the related names[i] to be NULL. This patch series fixes the find_vqs implementations to handle this case. Wei Wang (2): virtio_pci: use queue idx instead of array idx to set up the vq virtio: don't allocate vqs when names[i] = NULL