On Mon, Dec 03, 2018 at 10:30:53AM +0100, KarimAllah Ahmed wrote: > Guest memory can either be directly managed by the kernel (i.e. have a "struct > page") or they can simply live outside kernel control (i.e. do not have a > "struct page"). KVM mostly support these two modes, except in a few places > where the code seems to assume that guest memory must have a "struct page". > > This patchset introduces a new mapping interface to map guest memory into host > kernel memory which also supports PFN-based memory (i.e. memory without 'struct > page'). It also converts all offending code to this interface or simply > read/write directly from guest memory. > > As far as I can see all offending code is now fixed except the APIC-access page > which I will handle in a seperate series along with dropping > kvm_vcpu_gfn_to_page and kvm_vcpu_gpa_to_page from the internal KVM API. > > The current implementation of the new API uses memremap to map memory that does > not have a "struct page". This proves to be very slow for high frequency > mappings. Since this does not affect the normal use-case where a "struct page" > is available, the performance of this API will be handled by a seperate patch > series. How (if any) does it affect performance? Thanks!
