* Re: [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP [not found] <cover.1684137557.git.houwenlong.hwl@antgroup.com> @ 2023-06-07 12:49 ` Dave Hansen [not found] ` <20230608093303.GA16983@k08j02272.eu95sqa> 2023-06-07 18:29 ` Thomas Gleixner 1 sibling, 1 reply; 3+ messages in thread From: Dave Hansen @ 2023-06-07 12:49 UTC (permalink / raw) To: Hou Wenlong, linux-kernel Cc: Peter Zijlstra, Dave Hansen, virtualization, Usama Arif, H. Peter Anvin, Boris Ostrovsky, x86, Lai Jiangshan, VMware PV-Drivers Reviewers, Ingo Molnar, xen-devel, Pasha Tatashin, Anshuman Khandual, Brian Gerst, Borislav Petkov, Andy Lutomirski, Thomas Gleixner, Suren Baghdasaryan, Josh Poimboeuf, Juergen Gross, Alexey Makhalov, Kirill A. Shutemov, Andrew Morton, David Woodhouse, Mike Rapoport (IBM) On 5/15/23 01:19, Hou Wenlong wrote: > This patchset unifies FIXADDR_TOP as a variable for x86, allowing the > fixmap area to be movable and relocated with the kernel image in the > x86/PIE patchset [0]. This enables the kernel image to be relocated in > the top 512G of the address space. What problems does this patch set solve? How might that solution be visible to end users? Why is this problem important to you? Also, while you're waiting for someone to review _your_ code, have you considered reviewing anyone else's code? I don't think I've seen any review activity from you lately. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <20230608093303.GA16983@k08j02272.eu95sqa>]
* Re: [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP [not found] ` <20230608093303.GA16983@k08j02272.eu95sqa> @ 2023-06-10 18:37 ` Thomas Gleixner 0 siblings, 0 replies; 3+ messages in thread From: Thomas Gleixner @ 2023-06-10 18:37 UTC (permalink / raw) To: Hou Wenlong, Dave Hansen Cc: Peter Zijlstra, Dave Hansen, virtualization, Usama Arif, H. Peter Anvin, x86, Lai Jiangshan, VMware PV-Drivers Reviewers, Ingo Molnar, xen-devel, Pasha Tatashin, Anshuman Khandual, Brian Gerst, Borislav Petkov, Andy Lutomirski, Boris Ostrovsky, Suren Baghdasaryan, Josh Poimboeuf, Juergen Gross, Alexey Makhalov, linux-kernel, Kirill A. Shutemov, Andrew Morton, David Woodhouse, Mike Rapoport (IBM) On Thu, Jun 08 2023 at 17:33, Hou Wenlong wrote: > On Wed, Jun 07, 2023 at 08:49:15PM +0800, Dave Hansen wrote: >> What problems does this patch set solve? How might that solution be >> visible to end users? Why is this problem important to you? > > We want to build the kernel as PIE and allow the kernel image area, > including the fixmap area, to be placed at any virtual address. You are still failing to tell us why you want that and which problem this solves. Just that fact that you want to something is not an argument. > We have also implemented a PV Linux guest based on PIE, which can be > used in software virtualization similar to Lguest. PIE makes the guest > kernel share the host kernel space similar to a normal userspace > process. Additionally, we are considering whether it is possible to > use PIE and PVOPS to implement a user-mode kernel. That solves what? Thanks, tglx _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP [not found] <cover.1684137557.git.houwenlong.hwl@antgroup.com> 2023-06-07 12:49 ` [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP Dave Hansen @ 2023-06-07 18:29 ` Thomas Gleixner 1 sibling, 0 replies; 3+ messages in thread From: Thomas Gleixner @ 2023-06-07 18:29 UTC (permalink / raw) To: Hou Wenlong, linux-kernel Cc: Peter Zijlstra, Dave Hansen, virtualization, Usama Arif, H. Peter Anvin, x86, Lai Jiangshan, VMware PV-Drivers Reviewers, Ingo Molnar, xen-devel, Hou Wenlong, Pasha Tatashin, Anshuman Khandual, Brian Gerst, Borislav Petkov, Andy Lutomirski, Boris Ostrovsky, Suren Baghdasaryan, Josh Poimboeuf, Juergen Gross, Alexey Makhalov, Kirill A. Shutemov, Andrew Morton, David Woodhouse, Mike Rapoport (IBM) On Mon, May 15 2023 at 16:19, Hou Wenlong wrote: > This patchset unifies FIXADDR_TOP as a variable for x86, allowing the > fixmap area to be movable and relocated with the kernel image in the > x86/PIE patchset [0]. This enables the kernel image to be relocated in > the top 512G of the address space. What for? What's the use case. Please provide a proper argument why this is generally useful and important. Thanks, tglx _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization ^ permalink raw reply [flat|nested] 3+ messages in thread
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