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Date: Wed, 26 Nov 2014 17:48:09 +0100
From: Greg Kurz <gkurz@...ux.vnet.ibm.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org, rusty@....ibm.com,
Heiko Carstens <heiko.carstens@...ibm.com>,
Sudeep Dutt <sudeep.dutt@...el.com>,
virtualization@...ts.linux-foundation.org,
linux-s390@...r.kernel.org, lguest@...ts.ozlabs.org,
Pawel Moll <pawel.moll@....com>,
Christian Borntraeger <borntraeger@...ibm.com>,
Joel Stanley <joel@....id.au>, Arnd Bergmann <arnd@...db.de>,
Siva Yerramreddy <yshivakrishna@...il.com>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
pbonzini@...hat.com, Brian Swetland <swetland@...gle.com>,
Ashutosh Dixit <ashutosh.dixit@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Amit Shah <amit.shah@...hat.com>, linux390@...ibm.com,
David Miller <davem@...emloft.net>
Subject: Re: [PATCH v4 02/42] virtio: add support for 64 bit features.
On Tue, 25 Nov 2014 18:41:22 +0200
"Michael S. Tsirkin" <mst@...hat.com> wrote:
> From: Rusty Russell <rusty@...tcorp.com.au>
>
> Change the u32 to a u64, and make sure to use 1ULL everywhere!
>
> Cc: Brian Swetland <swetland@...gle.com>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> [Thomas Huth: fix up virtio-ccw get_features]
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
> Acked-by: Pawel Moll <pawel.moll@....com>
> Acked-by: Ohad Ben-Cohen <ohad@...ery.com>
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> include/linux/virtio.h | 2 +-
> include/linux/virtio_config.h | 8 ++++----
> tools/virtio/linux/virtio.h | 2 +-
> tools/virtio/linux/virtio_config.h | 2 +-
> drivers/char/virtio_console.c | 2 +-
> drivers/lguest/lguest_device.c | 10 +++++-----
> drivers/misc/mic/card/mic_virtio.c | 10 +++++-----
> drivers/remoteproc/remoteproc_virtio.c | 5 ++++-
> drivers/s390/kvm/kvm_virtio.c | 10 +++++-----
> drivers/s390/kvm/virtio_ccw.c | 29 ++++++++++++++++++++++++-----
> drivers/virtio/virtio.c | 12 ++++++------
> drivers/virtio/virtio_mmio.c | 14 +++++++++-----
> drivers/virtio/virtio_pci.c | 5 ++---
> drivers/virtio/virtio_ring.c | 2 +-
> 14 files changed, 69 insertions(+), 44 deletions(-)
>
> diff --git a/include/linux/virtio.h b/include/linux/virtio.h
> index 7828a7f..149284e 100644
> --- a/include/linux/virtio.h
> +++ b/include/linux/virtio.h
> @@ -101,7 +101,7 @@ struct virtio_device {
> const struct virtio_config_ops *config;
> const struct vringh_config_ops *vringh_config;
> struct list_head vqs;
> - u32 features;
> + u64 features;
> void *priv;
> };
>
> diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> index aa84d0e..022d904 100644
> --- a/include/linux/virtio_config.h
> +++ b/include/linux/virtio_config.h
> @@ -66,7 +66,7 @@ struct virtio_config_ops {
> vq_callback_t *callbacks[],
> const char *names[]);
> void (*del_vqs)(struct virtio_device *);
> - u32 (*get_features)(struct virtio_device *vdev);
> + u64 (*get_features)(struct virtio_device *vdev);
> void (*finalize_features)(struct virtio_device *vdev);
> const char *(*bus_name)(struct virtio_device *vdev);
> int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
> @@ -86,14 +86,14 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev,
> {
> /* Did you forget to fix assumptions on max features? */
> if (__builtin_constant_p(fbit))
> - BUILD_BUG_ON(fbit >= 32);
> + BUILD_BUG_ON(fbit >= 64);
While you're here, maybe you could derive the max value from the .features field ?
- BUILD_BUG_ON(fbit >= 64);
+ BUILD_BUG_ON(fbit >= (sizeof(vdev->features) << 3));
Two other locations below.
> else
> - BUG_ON(fbit >= 32);
> + BUG_ON(fbit >= 64);
>
Here...
> if (fbit < VIRTIO_TRANSPORT_F_START)
> virtio_check_driver_offered_feature(vdev, fbit);
>
> - return vdev->features & (1 << fbit);
> + return vdev->features & (1ULL << fbit);
> }
>
> static inline
> diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
> index 72bff70..8eb6421 100644
> --- a/tools/virtio/linux/virtio.h
> +++ b/tools/virtio/linux/virtio.h
> @@ -10,7 +10,7 @@
>
> struct virtio_device {
> void *dev;
> - u32 features;
> + u64 features;
> };
>
> struct virtqueue {
> diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h
> index 1f1636b..a254c2b 100644
> --- a/tools/virtio/linux/virtio_config.h
> +++ b/tools/virtio/linux/virtio_config.h
> @@ -2,5 +2,5 @@
> #define VIRTIO_TRANSPORT_F_END 32
>
> #define virtio_has_feature(dev, feature) \
> - ((dev)->features & (1 << feature))
> + ((dev)->features & (1ULL << feature))
>
> diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
> index 0074f9b..fda9a75 100644
> --- a/drivers/char/virtio_console.c
> +++ b/drivers/char/virtio_console.c
> @@ -355,7 +355,7 @@ static inline bool use_multiport(struct ports_device *portdev)
> */
> if (!portdev->vdev)
> return 0;
> - return portdev->vdev->features & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
> + return portdev->vdev->features & (1ULL << VIRTIO_CONSOLE_F_MULTIPORT);
> }
>
> static DEFINE_SPINLOCK(dma_bufs_lock);
> diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
> index c831c47..4d29bcd 100644
> --- a/drivers/lguest/lguest_device.c
> +++ b/drivers/lguest/lguest_device.c
> @@ -94,17 +94,17 @@ static unsigned desc_size(const struct lguest_device_desc *desc)
> }
>
> /* This gets the device's feature bits. */
> -static u32 lg_get_features(struct virtio_device *vdev)
> +static u64 lg_get_features(struct virtio_device *vdev)
> {
> unsigned int i;
> - u32 features = 0;
> + u64 features = 0;
> struct lguest_device_desc *desc = to_lgdev(vdev)->desc;
> u8 *in_features = lg_features(desc);
>
> /* We do this the slow but generic way. */
> - for (i = 0; i < min(desc->feature_len * 8, 32); i++)
> + for (i = 0; i < min(desc->feature_len * 8, 64); i++)
> if (in_features[i / 8] & (1 << (i % 8)))
> - features |= (1 << i);
> + features |= (1ULL << i);
>
> return features;
> }
> @@ -144,7 +144,7 @@ static void lg_finalize_features(struct virtio_device *vdev)
> memset(out_features, 0, desc->feature_len);
> bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
> for (i = 0; i < bits; i++) {
> - if (vdev->features & (1 << i))
> + if (vdev->features & (1ULL << i))
> out_features[i / 8] |= (1 << (i % 8));
> }
>
> diff --git a/drivers/misc/mic/card/mic_virtio.c b/drivers/misc/mic/card/mic_virtio.c
> index 0acd564..6d94f04 100644
> --- a/drivers/misc/mic/card/mic_virtio.c
> +++ b/drivers/misc/mic/card/mic_virtio.c
> @@ -68,10 +68,10 @@ static inline struct device *mic_dev(struct mic_vdev *mvdev)
> }
>
> /* This gets the device's feature bits. */
> -static u32 mic_get_features(struct virtio_device *vdev)
> +static u64 mic_get_features(struct virtio_device *vdev)
> {
> unsigned int i, bits;
> - u32 features = 0;
> + u64 features = 0;
> struct mic_device_desc __iomem *desc = to_micvdev(vdev)->desc;
> u8 __iomem *in_features = mic_vq_features(desc);
> int feature_len = ioread8(&desc->feature_len);
> @@ -79,8 +79,8 @@ static u32 mic_get_features(struct virtio_device *vdev)
> bits = min_t(unsigned, feature_len,
> sizeof(vdev->features)) * 8;
> for (i = 0; i < bits; i++)
> - if (ioread8(&in_features[i / 8]) & (BIT(i % 8)))
> - features |= BIT(i);
> + if (ioread8(&in_features[i / 8]) & (BIT_ULL(i % 8)))
> + features |= BIT_ULL(i);
>
> return features;
> }
> @@ -101,7 +101,7 @@ static void mic_finalize_features(struct virtio_device *vdev)
> bits = min_t(unsigned, feature_len,
> sizeof(vdev->features)) * 8;
> for (i = 0; i < bits; i++) {
> - if (vdev->features & BIT(bits))
> + if (vdev->features & BIT_ULL(bits))
> iowrite8(ioread8(&out_features[i / 8]) | (1 << (i % 8)),
> &out_features[i / 8]);
> }
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index dafaf38..627737e 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -207,7 +207,7 @@ static void rproc_virtio_reset(struct virtio_device *vdev)
> }
>
> /* provide the vdev features as retrieved from the firmware */
> -static u32 rproc_virtio_get_features(struct virtio_device *vdev)
> +static u64 rproc_virtio_get_features(struct virtio_device *vdev)
> {
> struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> struct fw_rsc_vdev *rsc;
> @@ -227,6 +227,9 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev)
> /* Give virtio_ring a chance to accept features */
> vring_transport_features(vdev);
>
> + /* Make sure we don't have any features > 32 bits! */
> + BUG_ON((u32)vdev->features != vdev->features);
> +
> /*
> * Remember the finalized features of our vdev, and provide it
> * to the remote processor once it is powered on.
> diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
> index ac79a09..c78251d 100644
> --- a/drivers/s390/kvm/kvm_virtio.c
> +++ b/drivers/s390/kvm/kvm_virtio.c
> @@ -80,16 +80,16 @@ static unsigned desc_size(const struct kvm_device_desc *desc)
> }
>
> /* This gets the device's feature bits. */
> -static u32 kvm_get_features(struct virtio_device *vdev)
> +static u64 kvm_get_features(struct virtio_device *vdev)
> {
> unsigned int i;
> - u32 features = 0;
> + u64 features = 0;
> struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
> u8 *in_features = kvm_vq_features(desc);
>
> - for (i = 0; i < min(desc->feature_len * 8, 32); i++)
> + for (i = 0; i < min(desc->feature_len * 8, 64); i++)
> if (in_features[i / 8] & (1 << (i % 8)))
> - features |= (1 << i);
> + features |= (1ULL << i);
> return features;
> }
>
> @@ -106,7 +106,7 @@ static void kvm_finalize_features(struct virtio_device *vdev)
> memset(out_features, 0, desc->feature_len);
> bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
> for (i = 0; i < bits; i++) {
> - if (vdev->features & (1 << i))
> + if (vdev->features & (1ULL << i))
> out_features[i / 8] |= (1 << (i % 8));
> }
> }
> diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
> index 1dbee95..abba04d 100644
> --- a/drivers/s390/kvm/virtio_ccw.c
> +++ b/drivers/s390/kvm/virtio_ccw.c
> @@ -660,11 +660,12 @@ static void virtio_ccw_reset(struct virtio_device *vdev)
> kfree(ccw);
> }
>
> -static u32 virtio_ccw_get_features(struct virtio_device *vdev)
> +static u64 virtio_ccw_get_features(struct virtio_device *vdev)
> {
> struct virtio_ccw_device *vcdev = to_vc_device(vdev);
> struct virtio_feature_desc *features;
> - int ret, rc;
> + int ret;
> + u64 rc;
> struct ccw1 *ccw;
>
> ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
> @@ -677,7 +678,6 @@ static u32 virtio_ccw_get_features(struct virtio_device *vdev)
> goto out_free;
> }
> /* Read the feature bits from the host. */
> - /* TODO: Features > 32 bits */
> features->index = 0;
> ccw->cmd_code = CCW_CMD_READ_FEAT;
> ccw->flags = 0;
> @@ -691,6 +691,16 @@ static u32 virtio_ccw_get_features(struct virtio_device *vdev)
>
> rc = le32_to_cpu(features->features);
>
> + /* Read second half feature bits from the host. */
> + features->index = 1;
> + ccw->cmd_code = CCW_CMD_READ_FEAT;
> + ccw->flags = 0;
> + ccw->count = sizeof(*features);
> + ccw->cda = (__u32)(unsigned long)features;
> + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
> + if (ret == 0)
> + rc |= (u64)le32_to_cpu(features->features) << 32;
> +
> out_free:
> kfree(features);
> kfree(ccw);
> @@ -715,8 +725,17 @@ static void virtio_ccw_finalize_features(struct virtio_device *vdev)
> vring_transport_features(vdev);
>
> features->index = 0;
> - features->features = cpu_to_le32(vdev->features);
> - /* Write the feature bits to the host. */
> + features->features = cpu_to_le32((u32)vdev->features);
> + /* Write the first half of the feature bits to the host. */
> + ccw->cmd_code = CCW_CMD_WRITE_FEAT;
> + ccw->flags = 0;
> + ccw->count = sizeof(*features);
> + ccw->cda = (__u32)(unsigned long)features;
> + ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
> +
> + features->index = 1;
> + features->features = cpu_to_le32(vdev->features >> 32);
> + /* Write the second half of the feature bits to the host. */
> ccw->cmd_code = CCW_CMD_WRITE_FEAT;
> ccw->flags = 0;
> ccw->count = sizeof(*features);
> diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
> index 7814b1f..d213567 100644
> --- a/drivers/virtio/virtio.c
> +++ b/drivers/virtio/virtio.c
> @@ -159,7 +159,7 @@ static int virtio_dev_probe(struct device *_d)
> int err, i;
> struct virtio_device *dev = dev_to_virtio(_d);
> struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
> - u32 device_features;
> + u64 device_features;
>
> /* We have a driver! */
> add_status(dev, VIRTIO_CONFIG_S_DRIVER);
> @@ -171,15 +171,15 @@ static int virtio_dev_probe(struct device *_d)
> dev->features = 0;
> for (i = 0; i < drv->feature_table_size; i++) {
> unsigned int f = drv->feature_table[i];
> - BUG_ON(f >= 32);
> - if (device_features & (1 << f))
> - dev->features |= (1 << f);
> + BUG_ON(f >= 64);
and here.
> + if (device_features & (1ULL << f))
> + dev->features |= (1ULL << f);
> }
>
> /* Transport features always preserved to pass to finalize_features. */
> for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
> - if (device_features & (1 << i))
> - dev->features |= (1 << i);
> + if (device_features & (1ULL << i))
> + dev->features |= (1ULL << i);
>
> dev->config->finalize_features(dev);
>
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index eb5b0e2..fd01c6d 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -142,14 +142,16 @@ struct virtio_mmio_vq_info {
>
> /* Configuration interface */
>
> -static u32 vm_get_features(struct virtio_device *vdev)
> +static u64 vm_get_features(struct virtio_device *vdev)
> {
> struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
> + u64 features;
>
> - /* TODO: Features > 32 bits */
> writel(0, vm_dev->base + VIRTIO_MMIO_HOST_FEATURES_SEL);
> -
> - return readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES);
> + features = readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES);
> + writel(1, vm_dev->base + VIRTIO_MMIO_HOST_FEATURES_SEL);
> + features |= ((u64)readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES) << 32);
> + return features;
> }
>
> static void vm_finalize_features(struct virtio_device *vdev)
> @@ -160,7 +162,9 @@ static void vm_finalize_features(struct virtio_device *vdev)
> vring_transport_features(vdev);
>
> writel(0, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
> - writel(vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
> + writel((u32)vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
> + writel(1, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
> + writel(vdev->features >> 32, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
> }
>
> static void vm_get(struct virtio_device *vdev, unsigned offset,
> diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
> index ab95a4c..68c0711 100644
> --- a/drivers/virtio/virtio_pci.c
> +++ b/drivers/virtio/virtio_pci.c
> @@ -102,12 +102,11 @@ static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
> }
>
> /* virtio config->get_features() implementation */
> -static u32 vp_get_features(struct virtio_device *vdev)
> +static u64 vp_get_features(struct virtio_device *vdev)
> {
> struct virtio_pci_device *vp_dev = to_vp_device(vdev);
>
> - /* When someone needs more than 32 feature bits, we'll need to
> - * steal a bit to indicate that the rest are somewhere else. */
> + /* We only support 32 feature bits. */
> return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
> }
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 15a8a05..61a1fe1 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -781,7 +781,7 @@ void vring_transport_features(struct virtio_device *vdev)
> break;
> default:
> /* We don't understand this bit. */
> - vdev->features &= ~(1 << i);
> + vdev->features &= ~(1ULL << i);
> }
> }
> }
--
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