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authorJason Wang <jasowang@redhat.com>2015-09-15 09:41:57 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2015-09-15 17:59:46 +0300
commit8f4216c7d28976f7ec1b2bcbfa0a9f787133c45e (patch)
tree1e530734d606cc871c6a01a2b41567dae350104c /virt
parenteefd6b06b17c5478e7c24bea6f64beaa2c431ca6 (diff)
downloadlinux-8f4216c7d28976f7ec1b2bcbfa0a9f787133c45e.tar.xz
kvm: fix zero length mmio searching
Currently, if we had a zero length mmio eventfd assigned on KVM_MMIO_BUS. It will never be found by kvm_io_bus_cmp() since it always compares the kvm_io_range() with the length that guest wrote. This will cause e.g for vhost, kick will be trapped by qemu userspace instead of vhost. Fixing this by using zero length if an iodevice is zero length. Cc: stable@vger.kernel.org Cc: Gleb Natapov <gleb@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index eb4c9d2849dc..9af68db73c6a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3157,10 +3157,25 @@ static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
const struct kvm_io_range *r2)
{
- if (r1->addr < r2->addr)
+ gpa_t addr1 = r1->addr;
+ gpa_t addr2 = r2->addr;
+
+ if (addr1 < addr2)
return -1;
- if (r1->addr + r1->len > r2->addr + r2->len)
+
+ /* If r2->len == 0, match the exact address. If r2->len != 0,
+ * accept any overlapping write. Any order is acceptable for
+ * overlapping ranges, because kvm_io_bus_get_first_dev ensures
+ * we process all of them.
+ */
+ if (r2->len) {
+ addr1 += r1->len;
+ addr2 += r2->len;
+ }
+
+ if (addr1 > addr2)
return 1;
+
return 0;
}