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Andrew Cooper
e6854fe547
The written ABI states that %es will be set up, but libxc doesn't do so. In practice, it breaks `rep movs` inside guests before they reload %es. The written ABI doesn't mention %ss, but libxc does set it up. Having %ds different to %ss is obnoxous to work with, as different registers have different implicit segments. Modify the spec to state that %ss is set up as a flat read/write segment. This a) matches the Multiboot 1 spec, b) matches what is set up in practice, and c) is the more sane behaviour for guests to use. Fixes:68e1183411('libxc: introduce a xc_dom_arch for hvm-3.0-x86_32 guests') Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Wei Liu <wl@xen.org> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> x86/pvh: Adjust dom0's starting state Fixes:b25fb1a04e"xen/pvh: Fix segment selector ABI" Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Wei Liu <wl@xen.org> Acked-by: Jan Beulich <jbeulich@suse.com> master commit:b25fb1a04emaster date: 2020-02-10 15:26:09 +0000 master commit:6ee1031362master date: 2020-02-11 11:04:26 +0000