Path: ...!eternal-september.org!feeder3.eternal-september.org!news.quux.org!news.nk.ca!rocksolid2!i2pn2.org!.POSTED!not-for-mail From: mitchalsup@aol.com (MitchAlsup1) Newsgroups: comp.arch Subject: Re: Virtualization layers Date: Wed, 16 Apr 2025 22:12:22 +0000 Organization: Rocksolid Light Message-ID: References: <760b3834d1202502f5f63e52b51cfdc8@www.novabbs.org> <1a0a4bdf578ae29ba9c2d20f19d0adde@www.novabbs.org> <07451feab34704115f6b9487cbcd6df9@www.novabbs.org> <1GtLP.2610861$TBhc.2239154@fx16.iad> <005f8b290a83aa0b6c1714369a1e540d@www.novabbs.org> <694fc2e37e0bcb6de19c0e1d1d0f0042@www.novabbs.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: i2pn2.org; logging-data="651696"; mail-complaints-to="usenet@i2pn2.org"; posting-account="o5SwNDfMfYu6Mv4wwLiW6e/jbA93UAdzFodw5PEa6eU"; User-Agent: Rocksolid Light X-Rslight-Posting-User: cb29269328a20fe5719ed6a1c397e21f651bda71 X-Spam-Checker-Version: SpamAssassin 4.0.0 X-Rslight-Site: $2y$10$DfrFWSrEi5DPuTLhmMdsYO9JYYBhGhqyTu5C50JLSiBPy3ARe2/Hy Bytes: 2439 Lines: 24 On Wed, 16 Apr 2025 21:48:49 +0000, Stefan Monnier wrote: >> Given 4 layers in the stack {Secure, Hyper, Super, User} and we have >> interrupts targeting {Secure, Hyper, Super}, do we pick up any liability >> or do we gain flexibility by being able to target interrupts directly to >> {user} ?? (the 4th element). > > All these discussions seem to presume a very fixed structure that (I > presume) corresponds to a typical situation in servers nowadays. > > But shouldn't the hardware aim for something more flexible to account > for other use cases? The goal is that:: The two layers in the middle can be managed as an accordion; supporting any number of HVs and GuestOSs between Secure and User. > E.g. What if I want to run my own VM as a user? Or my own HV? > That's likely to be a common desire for people working on the > development and testing of OSes and HVs? Use the accordion > > Stefan