On 06.09.2019 16:01, Jan Beulich wrote: > Although APIC initialization will typically clear out the LDR before > setting it, the APIC cleanup code should reset the LDR. > > This was discovered with a 32-bit KVM guest jumping into a kdump > kernel. The stale bits in the LDR triggered a bug in the KVM APIC > implementation which caused the destination mapping for VCPUs to be > corrupted. > > Note that this isn't intended to paper over the KVM APIC bug. The kernel > has to clear the LDR when resetting the APIC registers except when X2APIC > is enabled. > > Signed-off-by: Bandan Das <b...@redhat.com> > [Linux commit 558682b5291937a70748d36fd9ba757fb25b99ae] > Signed-off-by: Jan Beulich <jbeul...@suse.com>
FTR, commit 950b07c14e8c59444e2359f15fd70ed5112e11a0 reverts this in Linux, but only for breaking offlining and then re- onlining the BSP. Since we don't support this (yet), I don't see a reason for us to revert as well. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
