[PATCH v2 2/2] vhost: use checked versions of VIRTIO_BIT
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2025-10-21 14:57:03
Also in:
kvm, lkml, virtualization
Subsystem:
the rest, virtio core, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
This adds compile-time checked versions of VIRTIO_BIT that set bits in low and high qword, respectively. Will prevent confusion when people set bits in the wrong qword. Cc: "Paolo Abeni" <pabeni@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- drivers/vhost/net.c | 4 ++-- include/linux/virtio_features.h | 8 ++++++++ 2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index afabc5cf31a6..e208bb0ca7da 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c@@ -76,8 +76,8 @@ static const u64 vhost_net_features[VIRTIO_FEATURES_ARRAY_SIZE] = { (1ULL << VIRTIO_F_ACCESS_PLATFORM) | (1ULL << VIRTIO_F_RING_RESET) | (1ULL << VIRTIO_F_IN_ORDER), - VIRTIO_BIT(VIRTIO_NET_F_GUEST_UDP_TUNNEL_GSO) | - VIRTIO_BIT(VIRTIO_NET_F_HOST_UDP_TUNNEL_GSO), + VIRTIO_BIT_HI(VIRTIO_NET_F_GUEST_UDP_TUNNEL_GSO) | + VIRTIO_BIT_HI(VIRTIO_NET_F_HOST_UDP_TUNNEL_GSO), }; enum {
diff --git a/include/linux/virtio_features.h b/include/linux/virtio_features.h
index 9c99014196ea..2eaee0b7c2df 100644
--- a/include/linux/virtio_features.h
+++ b/include/linux/virtio_features.h@@ -8,6 +8,14 @@ #define VIRTIO_BIT(b) BIT_ULL((b) & 0x3f) #define VIRTIO_U64(b) ((b) >> 6) +/* Get a given feature bit in a given u64 entry. */ +#define VIRTIO_BIT_U64(bit, entry) \ + (BUILD_BUG_ON_ZERO(const_true(VIRTIO_U64(bit) != (qword))) + \ + BIT_ULL((bit) - 64 * (entry))) + +#define VIRTIO_BIT_LO(b) VIRTIO_BIT_U64(b, 0) +#define VIRTIO_BIT_HI(b) VIRTIO_BIT_U64(b, 1) + #define VIRTIO_FEATURES_ARRAY_SIZE VIRTIO_U64(VIRTIO_FEATURES_BITS) #define VIRTIO_DECLARE_FEATURES(name) \
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MST