Nicholas Piggin <npig...@gmail.com> writes: > Introduce virtual hypervisor methods that can support a "Nested KVM HV" > implementation using the bare metal 2-level radix MMU, and using HV > exceptions to return from H_ENTER_NESTED (rather than cause interrupts). > > HV exceptions can now be raised in the TCG spapr machine when running a > nested KVM HV guest. The main ones are the lev==1 syscall, the hdecr, > hdsi and hisi, hv fu, and hv emu, and h_virt external interrupts. > > HV exceptions are intercepted in the exception handler code and instead > of causing interrupts in the guest and switching the machine to HV mode, > they go to the vhyp where it may exit the H_ENTER_NESTED hcall with the > interrupt vector numer as return value as required by the hcall API. > > Address translation is provided by the 2-level page table walker that is > implemented for the bare metal radix MMU. The partition scope page table > is pointed to the L1's partition scope by the get_pate vhc method. > > Signed-off-by: Nicholas Piggin <npig...@gmail.com>
Reviewed-by: Fabiano Rosas <faro...@linux.ibm.com>
