Patches 1 and 2 are a consequence of trying to get the Linux x86 selftests to pass even when running under Xen.
Patches 3 and XSA-339 were further fallout from trying to put in place testing to cover all aspects of the PV fast system call entrypoints. Patch 3 was almost an XSA itself, but was ultimately argued as not affecting any known PV guest. It turns out that this is only true because of c/s dba899de14 in 2018, which did fix a real userspace => VM DoS on NetBSD. All fixes need backporting. Andrew Cooper (3): x86/pv: Don't deliver #GP for a SYSENTER with NT set x86/pv: Don't clobber NT on return-to-guest x86/pv: Inject #UD for missing SYSCALL callbacks xen/arch/x86/x86_64/compat/entry.S | 2 +- xen/arch/x86/x86_64/entry.S | 31 +++++++++++++++++++++---------- 2 files changed, 22 insertions(+), 11 deletions(-) -- 2.11.0
