> OSSTest reports: > > x86_64.S: Assembler messages: > x86_64.S:57: Error: no such instruction: `setssbsy' > /home/osstest/build.150510.build-amd64/xen/xen/Rules.mk:183: recipe for > target 'head.o' failed > make[4]: Leaving directory > '/home/osstest/build.150510.build-amd64/xen/xen/arch/x86/boot' > make[4]: *** [head.o] Error 1 > > All use of CET instructions, even those inside alternative blocks, needs to be > behind CONFIG_XEN_SHSTK, as it indicates suitable toolchain support. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
That's quite a bit of #ifdef-ary here. Simple (operand-less) insns like SETSSBSY could easily be made available via .byte directives. Would you be amenable to to ack-ing a patch to replace some of the #ifdef-s (at least the ones at the lstar, cstar, and sysenter entry points), after 4.14? Jan
