There's something uniquely satisfying about a perfectly executed drift. The screech of tires, the controlled chaos, the feeling of defying physics – it’s a thrill that transcends mere driving. While the real world offers expensive consequences for such maneuvers, the virtual world provides a safe and incredibly fun playground. Today, we're diving into the exciting world of Drift Hunters, a game that puts the art of the sideways slide squarely in your hands.
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The Core Gameplay Loop: A Dance with Momentum
At its heart, Drift Hunters is all about earning points through controlled skids. You'll start with a basic car and a handful of tracks, each designed with sweeping corners and open areas perfect for initiating and maintaining drifts.
Controls are intuitive and responsive:
Arrow keys or WASD: Control your steering. A light touch is often more effective than aggressive sawing at the wheel, especially during a drift.
Spacebar: This is your handbrake, a crucial tool for initiating drifts, especially at lower speeds or when you need to quickly change direction.
Shift key: For those with manual transmission enabled (an advanced option), this is your upshift.
Ctrl key: Your downshift.
The magic happens when you combine these inputs. Approach a corner, tap the handbrake or flick the wheel while applying throttle, and then counter-steer to keep your car sliding sideways. The longer you maintain the drift, the more points you accumulate. Stringing drifts together – a technique known as "combos" – is where the real high scores are found.
Beyond the Initial Skid: Unlocking Potential
As you earn drift points, you'll accumulate in-game currency. This is where the customization and progression really shine. The garage in Drift Hunters is your workshop for turning a stock car into a drifting beast.
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Start Slow, Learn the Fundamentals: Don't try to go flat out immediately. Focus on understanding how your car responds to inputs during a drift. Practice initiating drifts smoothly and maintaining them for short periods.
Experiment with Handbrake vs. Power Over: The handbrake is great for sharp, immediate drifts. Power over (using throttle and steering to break traction) is smoother and often better for maintaining long, flowing drifts. Learn when to use each.
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Watch Your Speed: Entering a corner too fast can lead to an unrecoverable spin. Too slow, and you won't have enough momentum to initiate a proper drift. Find the "sweet spot" for each corner.
Utilize the Environment: Many tracks have obstacles or barriers that can be used to "wall tap" or guide your drift, adding to your score and flair. Be careful not to collide too hard!
Upgrade Strategically: Early upgrades should focus on improving power and handling. A little more horsepower can make initiating drifts easier, and better suspension helps maintain control.
Practice, Practice, Practice: Like any skill, drifting takes time and repetition. Don't get discouraged by spins; learn from them and adjust your technique.
The Unrivaled Fun of the Sideways Slide
Drift Hunters offers a fantastic and accessible entry point into the world of virtual drifting. Its intuitive controls, rewarding progression system, and satisfying gameplay make it a standout title for anyone looking for a dose of adrenaline and automotive artistry. Whether you're a seasoned drift enthusiast or simply curious about the appeal of the sideways slide, you can jump in and start honing your skills. So fire up your browser, head over to Drift Hunters, and prepare to embrace the exhilarating world of controlled chaos. The track awaits, and your journey to becoming a drift master begins now.
On Tue, Jun 16, 2026 at 12:37:29PM +0100, Matt Evans wrote:
> Hi Praan,
>
> On 16/06/2026 09:47, Pranjal Shrivastava wrote:
> > On Wed, Jun 10, 2026 at 04:43:23PM +0100, Matt Evans wrote:
> >> A new VFIO feature, VFIO_DEVICE_FEATURE_DMA_BUF_MEMATTR, is added to
> >> set CPU-facing memory type attributes for a DMABUF exported from
> >> vfio-pci. These are used for subsequent mmap()s of the buffer.
> >>
> >> There are two attributes supported:
> >> - The default, VFIO_DEVICE_FEATURE_DMA_BUF_MEMATTR_NC
> >> - VFIO_DEVICE_FEATURE_DMA_BUF_MEMATTR_WC, which results in WC
> >> PTEs for the DMABUF's BAR region.
> >>
> >> Signed-off-by: Matt Evans <matt(a)ozlabs.org>
> >> ---
> >> drivers/vfio/pci/vfio_pci_core.c | 2 ++
> >> drivers/vfio/pci/vfio_pci_dmabuf.c | 57 +++++++++++++++++++++++++++++-
> >> drivers/vfio/pci/vfio_pci_priv.h | 14 ++++++++
> >> include/uapi/linux/vfio.h | 27 ++++++++++++++
> >> 4 files changed, 99 insertions(+), 1 deletion(-)
> >>
> >
[...]
> >> +
> >> + /* Verify DMABUF: see comments in vfio_pci_dma_buf_revoke() */
> >> + priv = dmabuf->priv;
> >> + if (dmabuf->ops != &vfio_pci_dmabuf_ops ||
> >> + READ_ONCE(priv->vdev) != vdev) {
> >> + ret = -ENODEV;
> >> + goto out_put_buf;
> >> + }
> >> +
> >> + switch (db_attr.memattr) {
> >> + case VFIO_DEVICE_FEATURE_DMA_BUF_MEMATTR_NC:
> >> + case VFIO_DEVICE_FEATURE_DMA_BUF_MEMATTR_WC:
> >> + WRITE_ONCE(priv->memattr, db_attr.memattr);
> >> + ret = 0;
> >> + break;
> >> +
> >> + default:
> >> + ret = -ENOENT;
> >
> > Nit: Looks like the agreement [1] was on -EOPNOTSUPP / -EINVAL but we
> > took -ENOENT here and in the doc string? Was that intentional?
> >
> > I tend to agree with Alex's suggestion here, we'd prefer one of those
> > two (-EINVAL / -EOPNOTSUPP) since it clearly communicates to the user
> > that "You sent a wrong arg" or "We don't support this"
> >
>
> Yes, it was intentional. This was noted in the v3 changelog entry in
> the cover letter:
>
> - Removed GET on vfio_pci_core_feature_dma_buf_memattr(), removed
> unnecessary taking of memory_lock, fixed error return values. In
> particular, removes ENOTSUPP, and uses ENOENT to indicate an
> unknown attribute enum value was passed to SET. In the discussion
> here,
> https://lore.kernel.org/all/20260602131417.41366391@shazbot.org/
> we'd agreed on EOPNOTSUPP before I realised that's already used
> elsewhere. ENOENT uniquely indicates an unknown attribute.
>
Ahh okay. I missed the changelogs in the cover letter.
> EINVAL/EOPNOTSUPP would indeed be semantically perfect, but after
> posting my reply there I remembered they are already overloaded with a
> load of different meanings.
>
> I think uniqueness is important here so that memattr issues (for example
> any future arch-specific porting issues) show up as an
> immediately-understandable error value.
>
> > -ENOENT means no such file or directory [2] to the user. Users may not
> > be kernel engineers who'd wanna peek into the code and they may simply
> > look at the uAPI files which doesn't give them an answer as to what
> > went wrong.
>
> But surely when they look at the uAPI header they will then see
> "* ENOENT: The given memattr is not supported." and understand what
> went wrong.
Fair enough. Since its documented it clearly in the uAPI header.
Thanks,
Praan
On Wed, Jun 10, 2026 at 04:43:20PM +0100, Matt Evans wrote:
> Previously, vfio_pci_zap_bars() (and the wrapper
> vfio_pci_zap_and_down_write_memory_lock()) calls were paired with
> calls to vfio_pci_dma_buf_move().
>
> This commit replaces them with a unified new function,
> vfio_pci_zap_revoke_bars() containing both the vfio_pci_dma_buf_move()
> and the unmap_mapping_range(), making it harder for callers to omit
> one. It adds a wrapper, vfio_pci_lock_zap_revoke_bars(), which takes
> the write memory_lock before zapping, and adds a new
> vfio_pci_unrevoke_bars() for the re-enable path.
>
> As of "vfio/pci: Convert BAR mmap() to use a DMABUF", the
> unmap_mapping_range() to zap is no longer performed for vfio-pci since
> the DMABUFs used for BAR mappings already zap PTEs when the
> vfio_pci_dma_buf_move() occurs.
>
> However, it must be assumed that VFIO drivers which override the .mmap
> op could create mappings _not_ backed by DMABUFs. So, the zap is
> still performed on revoke if .mmap is overridden, using a new
> zap_bars_on_revoke flag. A driver can explicitly opt out; the flag is
> cleared by the hisi_acc_vfio_pci driver, since its .mmap just wraps
> vfio_pci_core_mmap() and so still uses DMABUFs.
>
> Signed-off-by: Matt Evans <matt(a)ozlabs.org>
> ---
> .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 8 +++
> drivers/vfio/pci/vfio_pci_config.c | 30 ++++----
> drivers/vfio/pci/vfio_pci_core.c | 70 +++++++++++++------
> drivers/vfio/pci/vfio_pci_priv.h | 3 +-
> include/linux/vfio_pci_core.h | 1 +
> 5 files changed, 73 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> index 86362ec424a5..51990f6d66d5 100644
> --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> @@ -1692,6 +1692,14 @@ static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device
> if (ret)
> goto out_put_vdev;
>
> + /*
> + * hisi_acc_vfio_pci_mmap() calls down to
> + * vfio_pci_core_mmap(), so BAR mappings are still
> + * DMABUF-backed. They don't require a zap on revoke, so opt
> + * out:
> + */
> + hisi_acc_vdev->core_device.zap_bars_on_revoke = false;
> +
This seems to be happening after we vfio_pci_core_register_device, which
could be slightly problematic if another device in the same group races
to trigger a hot reset before we can set this to false. Could we
initialize this flag before registration instead?
> hisi_acc_vfio_debug_init(hisi_acc_vdev);
> return 0;
>
> diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
> index a10ed733f0e3..8bfab0da481c 100644
> --- a/drivers/vfio/pci/vfio_pci_config.c
> +++ b/drivers/vfio/pci/vfio_pci_config.c
> @@ -590,12 +590,10 @@ static int vfio_basic_config_write(struct vfio_pci_core_device *vdev, int pos,
> virt_mem = !!(le16_to_cpu(*virt_cmd) & PCI_COMMAND_MEMORY);
> new_mem = !!(new_cmd & PCI_COMMAND_MEMORY);
>
> - if (!new_mem) {
> - vfio_pci_zap_and_down_write_memory_lock(vdev);
> - vfio_pci_dma_buf_move(vdev, true);
> - } else {
> + if (!new_mem)
> + vfio_pci_lock_zap_revoke_bars(vdev);
> + else
> down_write(&vdev->memory_lock);
> - }
>
> /*
> * If the user is writing mem/io enable (new_mem/io) and we
> @@ -631,7 +629,7 @@ static int vfio_basic_config_write(struct vfio_pci_core_device *vdev, int pos,
> *virt_cmd |= cpu_to_le16(new_cmd & mask);
>
> if (__vfio_pci_memory_enabled(vdev))
> - vfio_pci_dma_buf_move(vdev, false);
> + vfio_pci_unrevoke_bars(vdev);
> up_write(&vdev->memory_lock);
> }
>
> @@ -712,16 +710,14 @@ static int __init init_pci_cap_basic_perm(struct perm_bits *perm)
> static void vfio_lock_and_set_power_state(struct vfio_pci_core_device *vdev,
> pci_power_t state)
> {
> - if (state >= PCI_D3hot) {
> - vfio_pci_zap_and_down_write_memory_lock(vdev);
> - vfio_pci_dma_buf_move(vdev, true);
> - } else {
> + if (state >= PCI_D3hot)
> + vfio_pci_lock_zap_revoke_bars(vdev);
> + else
> down_write(&vdev->memory_lock);
> - }
>
> vfio_pci_set_power_state(vdev, state);
> if (__vfio_pci_memory_enabled(vdev))
> - vfio_pci_dma_buf_move(vdev, false);
> + vfio_pci_unrevoke_bars(vdev);
> up_write(&vdev->memory_lock);
> }
>
> @@ -908,11 +904,10 @@ static int vfio_exp_config_write(struct vfio_pci_core_device *vdev, int pos,
> &cap);
>
> if (!ret && (cap & PCI_EXP_DEVCAP_FLR)) {
> - vfio_pci_zap_and_down_write_memory_lock(vdev);
> - vfio_pci_dma_buf_move(vdev, true);
> + vfio_pci_lock_zap_revoke_bars(vdev);
> pci_try_reset_function(vdev->pdev);
> if (__vfio_pci_memory_enabled(vdev))
> - vfio_pci_dma_buf_move(vdev, false);
> + vfio_pci_unrevoke_bars(vdev);
> up_write(&vdev->memory_lock);
> }
> }
> @@ -993,11 +988,10 @@ static int vfio_af_config_write(struct vfio_pci_core_device *vdev, int pos,
> &cap);
>
> if (!ret && (cap & PCI_AF_CAP_FLR) && (cap & PCI_AF_CAP_TP)) {
> - vfio_pci_zap_and_down_write_memory_lock(vdev);
> - vfio_pci_dma_buf_move(vdev, true);
> + vfio_pci_lock_zap_revoke_bars(vdev);
> pci_try_reset_function(vdev->pdev);
> if (__vfio_pci_memory_enabled(vdev))
> - vfio_pci_dma_buf_move(vdev, false);
> + vfio_pci_unrevoke_bars(vdev);
> up_write(&vdev->memory_lock);
> }
> }
> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
> index f9636d8f9e2a..5ea0bd4e7876 100644
> --- a/drivers/vfio/pci/vfio_pci_core.c
> +++ b/drivers/vfio/pci/vfio_pci_core.c
> @@ -319,8 +319,7 @@ static int vfio_pci_runtime_pm_entry(struct vfio_pci_core_device *vdev,
> * The vdev power related flags are protected with 'memory_lock'
> * semaphore.
> */
> - vfio_pci_zap_and_down_write_memory_lock(vdev);
> - vfio_pci_dma_buf_move(vdev, true);
> + vfio_pci_lock_zap_revoke_bars(vdev);
>
> if (vdev->pm_runtime_engaged) {
> up_write(&vdev->memory_lock);
> @@ -406,7 +405,7 @@ static void vfio_pci_runtime_pm_exit(struct vfio_pci_core_device *vdev)
> down_write(&vdev->memory_lock);
> __vfio_pci_runtime_pm_exit(vdev);
> if (__vfio_pci_memory_enabled(vdev))
> - vfio_pci_dma_buf_move(vdev, false);
> + vfio_pci_unrevoke_bars(vdev);
> up_write(&vdev->memory_lock);
> }
>
> @@ -1256,6 +1255,8 @@ static int vfio_pci_ioctl_set_irqs(struct vfio_pci_core_device *vdev,
> return ret;
> }
>
> +static void vfio_pci_zap_revoke_bars(struct vfio_pci_core_device *vdev);
> +
> static int vfio_pci_ioctl_reset(struct vfio_pci_core_device *vdev,
> void __user *arg)
> {
> @@ -1264,7 +1265,7 @@ static int vfio_pci_ioctl_reset(struct vfio_pci_core_device *vdev,
> if (!vdev->reset_works)
> return -EINVAL;
>
> - vfio_pci_zap_and_down_write_memory_lock(vdev);
> + down_write(&vdev->memory_lock);
>
> /*
> * This function can be invoked while the power state is non-D0. If
> @@ -1277,10 +1278,11 @@ static int vfio_pci_ioctl_reset(struct vfio_pci_core_device *vdev,
> */
> vfio_pci_set_power_state(vdev, PCI_D0);
>
> - vfio_pci_dma_buf_move(vdev, true);
> + vfio_pci_zap_revoke_bars(vdev);
I'm wondering if this change in behavior is correct?
BEFORE this patch the sequence was:
1. zap vma mappings
2. Enter D0
After this patch the sequence becomes
1. Take the lock
2. Enter D0
3. zap vma mappings
My worry is if user-space accesses a BAR *during* the transition to D0,
it could crash since the mappings still exist during the transition?
The old code is immune to it because it removed user-mappings first.
Following the discussion from v1 regarding the ordering of
vfio_pci_dma_buf_move() and the D0 transition.. while it makes sense to
perform the DMABUF revocation/move after the hardware is in D0.. I'm not
too confident about moving zap after D0 :/
I mean, sure, the user would just see all Fs on a read and writes will
be dropped silently until we are in D0.. but the behaviour before this
change was that the user access will fault and hang on the memory_lock
instead which ensures that the user observes a consistent dev state..
> +
> ret = pci_try_reset_function(vdev->pdev);
> if (__vfio_pci_memory_enabled(vdev))
> - vfio_pci_dma_buf_move(vdev, false);
> + vfio_pci_unrevoke_bars(vdev);
> up_write(&vdev->memory_lock);
>
> return ret;
> @@ -1648,20 +1650,37 @@ ssize_t vfio_pci_core_write(struct vfio_device *core_vdev, const char __user *bu
> }
Thanks,
Praan
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WhatsApp: +1 ( 318 ) 203-3657 )