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Re: Making spl7 just cli/sti?

From: Justus Winter
Subject: Re: Making spl7 just cli/sti?
Date: Sat, 07 Mar 2015 10:51:18 +0100
User-agent: alot/0.3.5

Quoting Samuel Thibault (2014-12-14 02:44:08)
> The attached patch fixes this by making spl.S use just cli/sti for spl7;
> they can be emulated fine without any VMEXIT.  This lowers the number of
> PIC mask changes to a few hundreds or thousands only, and getting the
> gnumach on kvm on kvm case way faster.

Unfortunately this change breaks gnumach on xen:

% xl create -c hurd
% xl dmesg
(XEN) Pagetable walk from 00000000fffffff8:
(XEN)  L4[0x000] = 00000000a0b9b027 000000000000057e
(XEN)  L3[0x003] = 00000000a0b9c027 000000000000057d
(XEN)  L2[0x1ff] = 0000000000000000 ffffffffffffffff
(XEN) domain_crash_sync called from entry.S: fault at ffff82d08021fe4c 
(XEN) Domain 30 (vcpu#0) crashed on cpu#1:
(XEN) ----[ Xen-4.4.1  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    1
(XEN) RIP:    0009:[<0000000080006768>]
(XEN) RFLAGS: 0000000000010286   EM: 1   CONTEXT: pv guest
(XEN) rax: 0000000000000011   rbx: 0000000080086db4   rcx: 000000000000043c
(XEN) rdx: 0000000000000007   rsi: 000000000000004b   rdi: 0000000080039430
(XEN) rbp: 0000000080086e54   rsp: 0000000000000000   r8:  0000000080006314
(XEN) r9:  0000000080086e54   r10: ffff82d08022d3d0   r11: 0000000000000286
(XEN) r12: 00000952cd6ddd1c   r13: ffff82d080300800   r14: ffff82d0802ea940
(XEN) r15: ffff8300a4434000   cr0: 000000008005003b   cr4: 00000000000006f0
(XEN) cr3: 0000000105f16000   cr2: 00000000fffffffc
(XEN) ds: 0011   es: 0011   fs: 0011   gs: 0011   ss: 0011   cs: 0009
(XEN) Guest stack trace from esp=00000000:
(XEN)  Stack empty.


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