On 25.06.2012, at 14:26, Mihai Caraman wrote:
> 64-bit host runs with lazy interrupt disabling, so local_irq_disable() does
> not disable interrupts right away and does not protect against preemption
> required by __kvmppc_vcpu_run(). Define a macro for 64-bit to use
> hard_irq_disable().
>
> Signed-off-by: Mihai Caraman <mihai.cara...@freescale.com>
> ---
> arch/powerpc/kvm/booke.c | 14 ++++++++++----
> 1 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 93b48e0..db05692 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -45,6 +45,12 @@ unsigned long kvmppc_booke_handlers;
> #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
> #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
>
> +#ifdef CONFIG_64BIT
> +#define _hard_irq_disable() hard_irq_disable()
> +#else
> +#define _hard_irq_disable() local_irq_disable()
> +#endif
So you only swap out the disable bit, but not the enable one? Ben, would this
work out?
Alex
> +
> struct kvm_stats_debugfs_item debugfs_entries[] = {
> { "mmio", VCPU_STAT(mmio_exits) },
> { "dcr", VCPU_STAT(dcr_exits) },
> @@ -456,7 +462,7 @@ int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
> local_irq_enable();
> kvm_vcpu_block(vcpu);
> clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
> - local_irq_disable();
> + _hard_irq_disable();
>
> kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
> r = 1;
> @@ -480,7 +486,7 @@ static int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
> if (need_resched()) {
> local_irq_enable();
> cond_resched();
> - local_irq_disable();
> + _hard_irq_disable();
> continue;
> }
>
> @@ -515,7 +521,7 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct
> kvm_vcpu *vcpu)
> return -EINVAL;
> }
>
> - local_irq_disable();
> + _hard_irq_disable();
> if (kvmppc_prepare_to_enter(vcpu)) {
> kvm_run->exit_reason = KVM_EXIT_INTR;
> ret = -EINTR;
> @@ -955,7 +961,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct
> kvm_vcpu *vcpu,
> * aren't already exiting to userspace for some other reason.
> */
> if (!(r & RESUME_HOST)) {
> - local_irq_disable();
> + _hard_irq_disable();
> if (kvmppc_prepare_to_enter(vcpu)) {
> run->exit_reason = KVM_EXIT_INTR;
> r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
> --
> 1.7.4.1
>
>
>
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