Re: [Xen-devel] [PATCH xen-4.6] xen: Remove CONFIG_X86_SUPERVISOR_MODE_KERNEL as x86_32 builds are unsupported

2015-01-05 Thread Tim Deegan
At 19:12 + on 02 Jan (1420222343), Andrew Cooper wrote: supervisor_mode_kernel was an x86_32-only feature which permitted a PV dom0 to run in ring 0, but at the expense of not being able to start any domUs. As the x86_32 Xen build has been removed from tree, removing the remaining

Re: [Xen-devel] [PATCH xen-4.6] xen: Remove CONFIG_X86_SUPERVISOR_MODE_KERNEL as x86_32 builds are unsupported

2015-01-05 Thread Ian Campbell
On Mon, 2015-01-05 at 16:07 +, Andrew Cooper wrote: What usecase was supervisor_mode_kernel developed for? It seems counter-intuitive, but I can't find anything in the history explaining its use. It was a prototype from the pre-pvops days to see if it would be feasible to have a

Re: [Xen-devel] [PATCH xen-4.6] xen: Remove CONFIG_X86_SUPERVISOR_MODE_KERNEL as x86_32 builds are unsupported

2015-01-05 Thread Mukesh Rathor
On Mon, 5 Jan 2015 15:35:27 + Andrew Cooper andrew.coop...@citrix.com wrote: On 05/01/15 15:16, Ian Campbell wrote: On Fri, 2015-01-02 at 19:12 +, Andrew Cooper wrote: supervisor_mode_kernel was an x86_32-only feature which permitted a PV dom0 to run in ring 0, but at the expense

Re: [Xen-devel] [PATCH xen-4.6] xen: Remove CONFIG_X86_SUPERVISOR_MODE_KERNEL as x86_32 builds are unsupported

2015-01-05 Thread Ian Campbell
On Fri, 2015-01-02 at 19:12 +, Andrew Cooper wrote: supervisor_mode_kernel was an x86_32-only feature which permitted a PV dom0 to run in ring 0, but at the expense of not being able to start any domUs. As the x86_32 Xen build has been removed from tree, removing the remaining

Re: [Xen-devel] [PATCH xen-4.6] xen: Remove CONFIG_X86_SUPERVISOR_MODE_KERNEL as x86_32 builds are unsupported

2015-01-05 Thread Andrew Cooper
On 05/01/15 15:16, Ian Campbell wrote: On Fri, 2015-01-02 at 19:12 +, Andrew Cooper wrote: supervisor_mode_kernel was an x86_32-only feature which permitted a PV dom0 to run in ring 0, but at the expense of not being able to start any domUs. As the x86_32 Xen build has been removed from

Re: [Xen-devel] [PATCH xen-4.6] xen: Remove CONFIG_X86_SUPERVISOR_MODE_KERNEL as x86_32 builds are unsupported

2015-01-05 Thread Ian Campbell
On Mon, 2015-01-05 at 15:35 +, Andrew Cooper wrote: Answering out-of-order This patch has no functional change WRT PVH. The hunk commented on is simply changed via indentation due to the removal of the conditional it is in. It was never been possible for a PVH kernel boot with

Re: [Xen-devel] [PATCH xen-4.6] xen: Remove CONFIG_X86_SUPERVISOR_MODE_KERNEL as x86_32 builds are unsupported

2015-01-05 Thread Andrew Cooper
On 05/01/15 15:41, Ian Campbell wrote: On Mon, 2015-01-05 at 15:35 +, Andrew Cooper wrote: Answering out-of-order This patch has no functional change WRT PVH. The hunk commented on is simply changed via indentation due to the removal of the conditional it is in. It was never been