On 03.03.2020 18:20, Roger Pau Monne wrote: > The current implementation of the hypervisor assisted flush for HAP is > extremely inefficient. > > First of all there's no need to call paging_update_cr3, as the only > relevant part of that function when doing a flush is the ASID vCPU > flush, so just call that function directly. > > Since hvm_asid_flush_vcpu is protected against concurrent callers by > using atomic operations there's no need anymore to pause the affected > vCPUs. > > Finally the global TLB flush performed by flush_tlb_mask is also not > necessary, since we only want to flush the guest TLB state it's enough > to trigger a vmexit on the pCPUs currently holding any vCPU state, as > such vmexit will already perform an ASID/VPID update, and thus clear > the guest TLB. > > Signed-off-by: Roger Pau Monné <roger....@citrix.com> > Reviewed-by: Wei Liu <w...@xen.org>
Reviewed-by: Jan Beulich <jbeul...@suse.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
