* Support of lguest? @ 2017-05-15 14:09 Juergen Gross 2017-05-15 14:22 ` Vitaly Kuznetsov 0 siblings, 1 reply; 3+ messages in thread From: Juergen Gross @ 2017-05-15 14:09 UTC (permalink / raw) To: Rusty Russell, Linux Kernel Mailing List, virtualization, xen-devel, lguest Lguest and Xen pv-guests are the only users of pv_mmu_ops (with the one exception of the .exit_mmap member, which is being used by Xen HVM-guests, too). As it is possible now to build a kernel without Xen pv-guest support while keeping PVH and PVHVM support, I thought about putting most pv_mmu_ops functions in #ifdef CONFIG_XEN_HAS_PVMMU sections. If there wouldn't be lguest... So my question: is anybody still using lguest or would like to keep it? If yes, I'd add CONFIG_PARAVIRT_MMU selected by CONFIG_XEN_PV and CONFIG_LGUEST_GUEST. If no, I'd remove lguest support and just use CONFIG_XEN_HAS_PVMMU, in case nobody would like me to use CONFIG_PARAVIRT_MMU even if lguest isn't there any more. Juergen ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Support of lguest? 2017-05-15 14:09 Support of lguest? Juergen Gross @ 2017-05-15 14:22 ` Vitaly Kuznetsov 2017-05-15 14:24 ` Juergen Gross 0 siblings, 1 reply; 3+ messages in thread From: Vitaly Kuznetsov @ 2017-05-15 14:22 UTC (permalink / raw) To: Juergen Gross Cc: lguest, xen-devel, Linux Kernel Mailing List, virtualization Juergen Gross <jgross@suse.com> writes: > Lguest and Xen pv-guests are the only users of pv_mmu_ops (with the > one exception of the .exit_mmap member, which is being used by Xen > HVM-guests, too). > > As it is possible now to build a kernel without Xen pv-guest support > while keeping PVH and PVHVM support, I thought about putting most > pv_mmu_ops functions in #ifdef CONFIG_XEN_HAS_PVMMU sections. There is an ongoing work to enable PV TLB flushing for Hyper-V guests: http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2017-April/104411.html it utilizes .flush_tlb_others member in pv_mmu_ops. hopefully, this work will be merged in 4.13. -- Vitaly ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Support of lguest? 2017-05-15 14:22 ` Vitaly Kuznetsov @ 2017-05-15 14:24 ` Juergen Gross 0 siblings, 0 replies; 3+ messages in thread From: Juergen Gross @ 2017-05-15 14:24 UTC (permalink / raw) To: Vitaly Kuznetsov Cc: lguest, xen-devel, Linux Kernel Mailing List, virtualization On 15/05/17 16:22, Vitaly Kuznetsov wrote: > Juergen Gross <jgross@suse.com> writes: > >> Lguest and Xen pv-guests are the only users of pv_mmu_ops (with the >> one exception of the .exit_mmap member, which is being used by Xen >> HVM-guests, too). >> >> As it is possible now to build a kernel without Xen pv-guest support >> while keeping PVH and PVHVM support, I thought about putting most >> pv_mmu_ops functions in #ifdef CONFIG_XEN_HAS_PVMMU sections. > > There is an ongoing work to enable PV TLB flushing for Hyper-V guests: > http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2017-April/104411.html > > it utilizes .flush_tlb_others member in pv_mmu_ops. > > hopefully, this work will be merged in 4.13. Thanks for the information. I'll keep .flush_tlb_others member outside the #ifdef section. Juergen ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2017-05-15 14:24 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2017-05-15 14:09 Support of lguest? Juergen Gross 2017-05-15 14:22 ` Vitaly Kuznetsov 2017-05-15 14:24 ` Juergen Gross
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