On Do, 2016-10-27 at 00:13 +0200, Laszlo Ersek wrote: > iPXE commit 71560d185475 added FXSAVE and FXRSTOR instructions. On KVM > hosts without "unrestricted_guest" support, these expose a gap in KVM's > big real mode emulation, leading to guest crashes. > > Radim has just posted the KVM patches. I think it might make sense to > suppress the regression of user experience within iPXE, until the KVM > feature reaches end-users. (Especially because the workaround for the > Tivoli VMM bug, which needed the FXSAVE and FXRSTOR instructions, is not > useful on KVM.)
Making the Tivoli VMM bug workaround configurable seems to be useful outside qemu scope too, see the reports on fxsave issues on physical hardware. Patches look good to me. Note that a new qemu version is just around the corner. Having this issue fixed in quickly would be great, we can pick it up by simply rebasing to a fixed version then. But that'll work out only in case the fixed land in ipxe master before qemu freeze, which is November 1st. thanks, Gerd _______________________________________________ ipxe-devel mailing list ipxe-devel@lists.ipxe.org https://lists.ipxe.org/mailman/listinfo.cgi/ipxe-devel
