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Re: [PATCH v3 2/9] vfio/pci: Add a helper to look up PFNs for DMABUFs

by Pranjal Shrivastava

On Mon, Jun 15, 2026 at 03:27:01PM +0100, Matt Evans wrote: Hi Matt, > > On 11/06/2026 21:30, Pranjal Shrivastava wrote: > > On Wed, Jun 10, 2026 at 04:43:16PM +0100, Matt Evans wrote: > >> Add vfio_pci_dma_buf_find_pfn(), which a VMA fault handler can use to > >> find a PFN. > >> > >> This supports multi-range DMABUFs, which typically would be used to > >> represent scattered spans but might even represent overlapping or > >> aliasing spans of PFNs. > >> > >> Because this is intended to be used in vfio_pci_core.c, we also need > >> to expose the struct vfio_pci_dma_buf in the vfio_pci_priv.h header. > >> > >> Signed-off-by: Matt Evans <matt(a)ozlabs.org> [...] > >> + > >> + const unsigned long pagesize = PAGE_SIZE << order; > >> + unsigned long vma_off = ((vma->vm_pgoff - priv->vma_pgoff_adjust) << > >> + PAGE_SHIFT) & VFIO_PCI_OFFSET_MASK; > >> + unsigned long rounded_page_addr = ALIGN_DOWN(address, pagesize); > >> + unsigned long rounded_page_end = rounded_page_addr + pagesize; > >> + unsigned long page_buf_offset; > >> + unsigned long page_buf_offset_end; > >> + unsigned long range_buf_offset = 0; > >> + unsigned int i; > >> + > >> + if (rounded_page_addr < vma->vm_start || rounded_page_end > vma->vm_end) { > >> + if (order > 0) > >> + return -EAGAIN; > >> + > >> + /* A fault address outside of the VMA is absurd. */ > >> + WARN(1, "Fault addr 0x%lx outside VMA 0x%lx-0x%lx\n", > >> + address, vma->vm_start, vma->vm_end); > > > > This could flood dmesg if triggered repeatedly by userspace :( > > Since a fault outside the VMA is an invalid access that already results > > in a SIGBUS, we could probably avoid the WARN here? > > Perhaps pr_warn_ratelimited() should suffice? > > I'm OK moving to a pr_warn_ratelimited(). Note though that this case is > "genuinely impossible" currently and the check exists in case something > changes elsewhere. (Re your flood comment, am I missing a way for > userspace to trigger this? The scenario is a faulthandler for a VMA > getting a VA outside the bounds of that VMA; such a fault address > wouldn't match that VMA.) I should've been explicit, I guess I worded it wrong, my bad. I didn't mean that a user-space could hit this on it's own. However, I meant to say if there's a bug in core mm during some future work, dmesg being flooded by stackdumps gets messy (especially during dev) as the underlying reason might get missed in the flood. Hence, I prefer moving to pr_warn_ratelimited. > > >> + return -EFAULT; > >> + } > >> + > >> + /* > >> + * page_buff_offset[_end] is the span of DMABUF offsets > >> + * corresponding to the faulting page: > >> + */ > >> + if (unlikely(check_add_overflow(rounded_page_addr - vma->vm_start, > >> + vma_off, &page_buf_offset) || > >> + check_add_overflow(page_buf_offset, pagesize, > >> + &page_buf_offset_end))) > >> + return -EFAULT; > >> + > >> + for (i = 0; i < priv->nr_ranges; i++) { > >> + size_t range_len = priv->phys_vec[i].len; > >> + phys_addr_t range_start = priv->phys_vec[i].paddr; > >> + > >> + /* > >> + * If the current range starts after the page's span, > >> + * this and any future range won't match. Bail early. > >> + */ > >> + if (page_buf_offset_end <= range_buf_offset) > >> + break; > >> + > >> + if (page_buf_offset >= range_buf_offset && > >> + page_buf_offset_end <= range_buf_offset + range_len) { > >> + /* > >> + * The faulting page is wholly contained > >> + * within the span represented by the range. > >> + * Validate PFN alignment for the order: > >> + */ > >> + unsigned long pfn = (range_start + page_buf_offset - > >> + range_buf_offset) / PAGE_SIZE; > > > > Minor nit: I'm aware that decent compilers convert pow(2) divides to >> > > However, we seem to be using `>> PAGE_SHIFT` across vfio-pci. E.g.: > > > > return (pci_resource_start(vdev->pdev, index) >> PAGE_SHIFT) + pgoff; > > unsigned long pgoff = (addr - vma->vm_start) >> PAGE_SHIFT; > > > > Let's consider using the same pattern? > > (Do you know of a compiler that both builds the kernel and does NOT > perform this transformation? I am confident that resulting object code > will be OK here.) > I guess most of the modern compiler do, I was just referring to the style across the file. I don't have any strong opinion. > In an earlier revision I was using shifts but they were fairly messy > compared to this expression, which arises from a request by Jason. > Yea, looking back at Jason's comment [1], I think he was mainly pointing out that the common factor (PAGE_SIZE) could be grouped together. But again, no strong feeling about this, just picked up a pattern across the file. If it breaks on some compiler we can fix it later.. > >> + > >> + if (IS_ALIGNED(pfn, 1 << order)) { > >> + *out_pfn = pfn; > >> + return 0; > >> + } > >> + /* Retry with smaller order */ > >> + return -EAGAIN; > >> + } > >> + range_buf_offset += range_len; > >> + } > >> + > >> + /* > >> + * A hugepage straddling a range boundary will fail to match a > >> + * range, but the address will (eventually) match when retried > >> + * with a smaller page. > >> + */ > >> + if (order > 0) > >> + return -EAGAIN; > >> + > >> + /* > >> + * If we get here, the address fell outside of the span > >> + * represented by the (concatenated) ranges. Setup of a > > > > Nit: double space before "Setup" and "But" below. > > I liked Alex's response :-) This is common practice for monospaced text > since increasing inter-sentence spacing helps readability in paragraph > blocks (see Documentation/ for many examples ...). > Ack. :) > >> + * mapping must ensure that the VMA is <= the total size of > >> + * the ranges, so this should never happen. But, if it does, > >> + * force SIGBUS for the access and warn. > >> + */ > >> + WARN_ONCE(1, "No range for addr 0x%lx, order %d: VMA 0x%lx-0x%lx pgoff 0x%lx, %u ranges, size 0x%zx\n", > >> + address, order, vma->vm_start, vma->vm_end, vma->vm_pgoff, > >> + priv->nr_ranges, priv->size); > >> + > >> + return -EFAULT; > > > > The fall-through logic at the end feels a bit redundant. > > > > If we've exhausted the phys_vec list without finding a match, returning > > -EAGAIN for order > 0 seems like the correct fallback behavior. > > This path can happen (for order > 0) e.g. mis-alignment of VA versus the > PFN, i.e. is likely... > > > However, the subsequent WARN_ONCE for the order == 0 seems unnecessary? > > An out-of-bounds access is an error that should simply return -EFAULT > > (converting to SIGBUS) without polluting the kernel log with stackdumps? > > ...but the only way this can happen, for order == 0, is if the VMA > extends beyond the underlying resource. For example, if the VMA is > larger than the DMABUF size (the total length of phys ranges set up > inside the DMABUF). Both VFIO BAR mmap() and a DMABUF mmap() disallow > mapping off the end of the underlying resource. That is, this also > "cannot happen" but if logic changes elsewhere then we will really want > to know about hitting this case -- the check is not redundant. I didn't mean to imply that the path itself is impossible or won't happen.. I just meant that the logic / structure felt a bit redundant at the end of the function.. Instead of having the separate `if (order > 0)` block falling through to the base case, I suggest it could be cleaner as: ret = order ? -EAGAIN : -EFAULT; if (ret == -EFAULT) pr_warn_ratelimited(...); return ret; But again, that's a preference. I'd leave that to your judgement. > > Still, it doesn't need a regdump/backtrace (at least while this is only > called from one spot), so a pr_warn_* is better. > Ack. Thanks, Praan

6 hours, 48 minutes

What Makes the Foodle Game Name So Interesting?

by lousmagic0＠gmail.com

At first glance, the Foodle game name feels like it was designed for fun-loving Gen Z players who enjoy casual gaming with a side of chaos. The concept is simple: guess food-related words within limited attempts. Easy, right? That’s exactly what it wants you to think. The complexity kicks in when you realize your brain suddenly forgets every food you’ve ever eaten. Seriously, under pressure, “burger” becomes “burder,” and “noodle” starts looking like it belongs in a physics textbook. https://food-le.com The genius behind the Foodle game name lies in its deceptive simplicity. Unlike traditional word games, it adds a flavorful twist—literally forcing you to think in categories like snacks, dishes, ingredients, and sometimes even weird culinary terms you’ve only seen on cooking shows at 3 a.m.

15 hours, 6 minutes

A Guide to the Thrills of Drift Hunters

by tylerwire＠web-library.net

Have you ever dreamt of effortlessly sliding a high-performance car around a corner, smoke billowing from the tires, and the roar of the engine echoing in your ears? While real-life drifting requires significant skill, dedication, and a rather large budget, the world of online gaming offers a fantastic, accessible alternative. Today, we're diving into an exhilarating example: Drift Hunters, a game that lets you experience the pure joy of controlled chaos on four wheels. What is Drift Hunters and Why Should You Play? Drift Hunters is a browser-based drifting game that, despite its simplicity, delivers an incredibly satisfying and addictive experience. Forget complex storylines or elaborate character progression; this game is all about the art of the drift. You'll choose from a roster of customizable cars, hit the track, and focus solely on chaining together epic drifts to earn points and upgrade your ride. https://drifthuntersfree.com The beauty of games like Drift Hunters lies in their immediacy. There’s no lengthy download, no expensive console required. You can simply open your browser, navigate to the game, and within seconds, you're behind the wheel, ready to lay down some serious rubber. It's the perfect pick-up-and-play title for a quick adrenaline fix, a stress-relieving session, or simply to hone your virtual drifting skills. Getting Started: Your First Slide The controls in Drift Hunters are refreshingly straightforward, making it easy for newcomers to jump right in. Typically, you'll use the W, A, S, D keys for acceleration, turning, and braking, with the spacebar often serving as your handbrake – a crucial tool for initiating those perfect drifts. When you first load the game, you'll likely start with a basic car and a simple track. Don't be discouraged if your initial attempts at drifting resemble a drunken penguin on ice. The key is practice and understanding the mechanics. Here’s a general approach to initiating a drift: Build Speed: Accelerate to a decent speed before approaching a corner. Initiate with a Tap: Just before entering the turn, briefly tap the handbrake while simultaneously turning into the corner. Counter-Steer and Throttle Control: As the car begins to slide, you'll need to counter-steer (turn the wheel in the opposite direction of the slide) and feather the throttle. This is where the "art" comes in. Too much throttle, and you'll spin out; too little, and you'll straighten up. Maintain and Exit: Keep the slide going by balancing counter-steering and throttle, guiding your car through the corner. As you exit, gradually straighten the wheel and apply more throttle to regain control. The goal is to maintain the drift for as long as possible, keeping your car at a good angle and avoiding hitting the walls. Longer, smoother drifts earn you more points, which in turn means more money to spend on upgrades. You can find the game and start your journey at https://drifthuntersfree.com. Mastering the Art: Tips for Becoming a Drift King Once you've got the basics down, here are some tips to elevate your Drift Hunters game: Practice Makes Perfect: This cannot be stressed enough. Each car handles differently, and each track presents unique challenges. Spend time on different maps, experimenting with various approaches to corners. Upgrade Strategically: Early on, focus on upgrading your engine for more power and your tires for better grip (or lack thereof, depending on your drift style!). Later, you can fine-tune suspension and weight distribution. Experiment with Camera Angles: Some players find it easier to drift with a third-person view, while others prefer a more immersive in-car perspective. Find what works best for you. Listen to Your Engine: The sound of your engine can provide crucial feedback. Learn to recognize when you're about to spin out or when you're losing momentum. Don't Be Afraid to Fail: Spinning out is part of the learning process. Embrace it, learn from your mistakes, and try again. Handbrake is Your Friend: While tempting to rely solely on power slides, the handbrake is invaluable for precise drift initiation and adjusting your angle mid-drift. Watch the Pros (if available): If you can find videos of experienced Drift Hunters players, pay attention to their lines, their throttle control, and how they manage their drifts. Conclusion: Embrace the Slide Drift Hunters offers a fantastic opportunity to experience the thrill of drifting without the real-world consequences. It's a game that rewards practice, precision, and a bit of daring. Whether you're looking for a quick five-minute break or an extended session of rubber-burning fun, this game delivers. So, fire up your browser, pick your dream drift machine, and prepare to unleash your inner petrolhead. The asphalt awaits your tire marks!

17 hours, 58 minutes

Discover Your Ultimate Hub for Free Online Sports Games

by vogadi7654＠dyleris.com

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23 hours, 20 minutes

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1 day, 11 hours

Technicians Recovery Top 4 Best Cryp-tocurrency Recovery Specialist Legitimate Best Cry-pto Recovery Specialist

by Flora King

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by Flora King

1 day, 11 hours

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by Flora King

1 day, 11 hours

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by Flora King

1 day, 11 hours

Technicians Recovery Top 1 Best Crypt-ocurrency Recovery Company Legitimate Best Cryp-to Recovery Company

by Flora King

1 day, 11 hours

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