KVM: add kvm_is_error_gpa() helper

It's quite common (in the s390 guest access code) to test if a guest
physical address points to a valid guest memory area or not.
So add a simple helper function in common code, since this might be
of interest for other architectures as well.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
(cherry picked from commit dfeec843fb237d73947e818f961e8d6f0df22b01)
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f6801d10e04ca2c1a1583f02380ed475a6b5c784..eef946f92c0c8d1b231a59a300b003f1487352b4 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -840,6 +840,13 @@ static inline hpa_t pfn_to_hpa(pfn_t pfn)
        return (hpa_t)pfn << PAGE_SHIFT;
 }
 
+static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
+{
+       unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
+
+       return kvm_is_error_hva(hva);
+}
+
 static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
 {
        set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);