The Xen Project has ported its hypervisor to the 64-bit Raspberry Pi 4. The Register reports: The idea to do an official port bubbled up from the Xen community and then reached the desk of George Dunlap, chairman of the Xen Project’s Advisory Board. Dunlap mentioned the idea to an acquaintance who works at the Raspberry Pi Foundation, and was told that around 40 percent of Pis are sold to business users rather than hobbyists. With more than 30 million Arm-based Pis sold as of December 2019, and sales running at a brisk 600,000-plus a month in April 2020, according to Pi guy Eben Upton, Dunlap saw an opportunity to continue Xen’s drive towards embedded and industrial applications.

Stefano Stabellini, who by day works at FPGA outfit Xilinx, and past Apache Foundation director Roman Shaposhnik took on the task of the port. The pair clocked that the RPi 4’s system-on-chip used a regular GIC-400 interrupt controller, which Xen supports out of the box, and thought this was a sign this would, overall, be an easy enough job. That, the duo admitted, was dangerous optimism. Forget the IRQs, there was a whole world of physical and virtual memory addresses to navigate. The pair were “utterly oblivious that we were about to embark on an adventure deep in the belly of the Xen memory allocator and Linux address translation layers,” we’re told. [The article goes on to explain the hurdles that were ahead of them.]

“Once Linux 5.9 is out, we will have Xen working on RPi4 out of the box,” the pair said. […] Stefano Stabellini told The Register that an official Xen-on-RPi port will make a difference in the Internet-of-Things community, because other Arm development boards are more costly than the Pi, and programmers will gravitate towards a cheaper alternative for prototyping. He also outlined scenarios, such as a single edge device running both a real-time operating system alongside another OS, each dedicated to different tasks but inhabiting the same hardware and enjoying the splendid isolation of a virtual machine rather than sharing an OS as containers. George Dunlap also thinks that an official Xen-on-RPi port could also be of use to home lab builders, or perhaps just give developers a more suitable environment for their side projects than a virtual machine or container on their main machines. Stay tuned to Project EVE’s Github page for more details about how to build your own Xen-for-RPi. Hacks to get it up and running should also appear on the Xen project blog.

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Source: Slashdot – Xen Project Officially Ports Its Hypervisor To Raspberry Pi 4

An anonymous reader quotes a report from Fortune: Cloudflare is launching a privacy-friendly rival to Google Analytics. Google Analytics is a free toolkit that’s used by website administrators across the globe to help them track the behavior of the people visiting those sites — how they find them, what they do there, the devices they’re using, and so on. However, the service — the most popular of its kind — also helps Google track websites’ visitors, so it can better profile them for advertising purposes. This privacy-invasive aspect makes many people squeamish. And that’s where Cloudflare would now like to step in.

Around its birthday every year, the decade-old company — which went public last year — announces a move intended to “give back” to the wider Internet community. These moves are often related to privacy. On Tuesday, it unveiled Cloudflare Web Analytics, a free-to-use toolkit that largely replicates what Google Analytics offers — minus the invasive tracking, and thus the ability to assess the performance of targeted ads carried on websites. Cloudflare Web Analytics is immediately available to the company’s paid customers, but any website owner will be able to use it from some point in the coming months. Cloudflare’s scale is crucial here […] because it takes substantial resources to run a free analytics platform, and Cloudflare already has a giant network that can support the load. Cloudflare Web Analytics isn’t the company’s only big announcement this week. “On Monday, Cloudflare launched a beta testing program for a cloud technology called Durable Objects,” the report adds. “You can read the technical explanation here, but in essence this is a tool that allows developers of online services to make those services comply with the increasing number of data-localization and data-protection laws that limit where users’ data is supposed to go.”

“With Durable Objects, Cloudflare says, it is possible to specify where particular data will reside on Cloudflare’s network, so — for example — a German user’s data does not have to leave Germany. Or, with an eye to other current news, a service such as TikTok could ensure that U.S. users’ data never leaves the U.S., without having to create a separate version of its service for that country.”

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Source: Slashdot – Cloudflare’s Privacy Crusade Continues With a Challenge To Google Analytics

Anthony Boadle, reporting for Reuters: […] In April and May, so many Manaus residents were dying from COVID-19 that its hospitals collapsed and cemeteries could not dig graves fast enough. The city never imposed a full lockdown. Non-essential businesses were closed but many simply ignored social distancing guidelines. Then in June, deaths unexpectedly plummeted. Public health experts wondered whether so many residents had caught the virus that it had run out of new people to infect. Research posted last week to medRxiv, a website distributing unpublished papers on health science, estimated that 44% to 66% of the Manaus population was infected between the peak in mid-May and August.

The study by the University of Sao Paulo’s Institute of Tropical Medicine tested newly donated banked blood for antibodies to the virus and used a mathematical model to estimate contagion levels. The high infection rate suggested that herd immunity led to the dramatic drop in cases and deaths, the study said. Scientists estimate that up to 70 pct of the population may need to be protected against coronavirus to reach herd immunity. In Manaus, daily burials and cremations fell from a peak of 277 on May 1 to just 45 in mid-September, the mayor’s office said. The COVID-19 death toll that officially peaked at 60 on April 30 dropped to just two or three a day by late August. Now the numbers are on the rise again.

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Source: Slashdot – In Brazil’s Amazon a COVID-19 Resurgence Dashes Herd Immunity Hopes