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kvm: fix MMIO/PIO collision misdetection 

PIO and MMIO are separate address spaces, but
ioeventfd registration code mistakenly detected
two eventfds as duplicate if they use the same address,
even if one is PIO and another one MMIO.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-04-04 13:27:21 +03:00 committed by Gleb Natapov
parent b8c07d55d0
commit 05e07f9bdb
1 changed files with 6 additions and 2 deletions
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8
virt/kvm/eventfd.c
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@ -574,6 +574,7 @@ struct _ioeventfd {
struct eventfd_ctx *eventfd;
u64 datamatch;
struct kvm_io_device dev;
u8 bus_idx;
bool wildcard;
};
@ -666,7 +667,8 @@ ioeventfd_check_collision(struct kvm *kvm, struct _ioeventfd *p)
struct _ioeventfd *_p;
list_for_each_entry(_p, &kvm->ioeventfds, list)
if (_p->addr == p->addr && _p->length == p->length &&
if (_p->bus_idx == p->bus_idx &&
_p->addr == p->addr && _p->length == p->length &&
(_p->wildcard || p->wildcard ||
_p->datamatch == p->datamatch))
return true;
@ -723,6 +725,7 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
INIT_LIST_HEAD(&p->list);
p->addr = args->addr;
p->bus_idx = bus_idx;
p->length = args->len;
p->eventfd = eventfd;
@ -781,7 +784,8 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
list_for_each_entry_safe(p, tmp, &kvm->ioeventfds, list) {
bool wildcard = !(args->flags & KVM_IOEVENTFD_FLAG_DATAMATCH);
if (p->eventfd != eventfd ||
if (p->bus_idx != bus_idx ||
p->eventfd != eventfd ||
p->addr != args->addr ||
p->length != args->len ||
p->wildcard != wildcard)