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KVM: async_pf: change kvm_setup_async_pf()/kvm_arch_setup_async_pf() return type to bool

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Unlike normal 'int' functions returning '0' on success, kvm_setup_async_pf()/
kvm_arch_setup_async_pf() return '1' when a job to handle page fault
asynchronously was scheduled and '0' otherwise. To avoid the confusion
change return type to 'bool'.

No functional change intended.

Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200615121334.91300-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2020-06-15 14:13:34 +02:00 committed by Paolo Bonzini
parent 9ce372b33a
commit e8c22266e6
4 changed files with 23 additions and 21 deletions
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20
arch/s390/kvm/kvm-s390.c
View File

@ -3954,33 +3954,31 @@ bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
return true;
}
static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
{
hva_t hva;
struct kvm_arch_async_pf arch;
int rc;
if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
return 0;
return false;
if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
vcpu->arch.pfault_compare)
return 0;
return false;
if (psw_extint_disabled(vcpu))
return 0;
return false;
if (kvm_s390_vcpu_has_irq(vcpu, 0))
return 0;
return false;
if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
return 0;
return false;
if (!vcpu->arch.gmap->pfault_enabled)
return 0;
return false;
hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
hva += current->thread.gmap_addr & ~PAGE_MASK;
if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
return 0;
return false;
rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
return rc;
return kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
}
static int vcpu_pre_run(struct kvm_vcpu *vcpu)

4
arch/x86/kvm/mmu/mmu.c
View File

@ -4045,8 +4045,8 @@ static void shadow_page_table_clear_flood(struct kvm_vcpu *vcpu, gva_t addr)
walk_shadow_page_lockless_end(vcpu);
}
static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
gfn_t gfn)
static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
gfn_t gfn)
{
struct kvm_arch_async_pf arch;

4
include/linux/kvm_host.h
View File

@ -211,8 +211,8 @@ struct kvm_async_pf {
void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
unsigned long hva, struct kvm_arch_async_pf *arch);
bool kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
unsigned long hva, struct kvm_arch_async_pf *arch);
int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
#endif

16
virt/kvm/async_pf.c
View File

@ -156,17 +156,21 @@ void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu)
}
}
int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
unsigned long hva, struct kvm_arch_async_pf *arch)
/*
* Try to schedule a job to handle page fault asynchronously. Returns 'true' on
* success, 'false' on failure (page fault has to be handled synchronously).
*/
bool kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
unsigned long hva, struct kvm_arch_async_pf *arch)
{
struct kvm_async_pf *work;
if (vcpu->async_pf.queued >= ASYNC_PF_PER_VCPU)
return 0;
return false;
/* Arch specific code should not do async PF in this case */
if (unlikely(kvm_is_error_hva(hva)))
return 0;
return false;
/*
* do alloc nowait since if we are going to sleep anyway we
@ -174,7 +178,7 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
*/
work = kmem_cache_zalloc(async_pf_cache, GFP_NOWAIT | __GFP_NOWARN);
if (!work)
return 0;
return false;
work->wakeup_all = false;
work->vcpu = vcpu;
@ -193,7 +197,7 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
schedule_work(&work->work);
return 1;
return true;
}
int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu)