Commit ac3c8b41 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
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KVM: PPC: Book3S HV P9: Reflect userspace hcalls to hash guests to support PR KVM 



The reflection of sc 1 interrupts from guest PR=1 to the guest kernel is
required to support a hash guest running PR KVM where its guest is
making hcalls with sc 1.

In preparation for hash guest support, add this hcall reflection to the
P9 path. The P7/8 path does this in its realmode hcall handler
(sc_1_fast_return).

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-30-npiggin@gmail.com
parent 6165d5dd

arch/powerpc/kvm/book3s_hv.c

+16 −6
Original line number Diff line number Diff line
@@ -1457,13 +1457,23 @@ static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu, 
			 * Guest userspace executed sc 1. This can only be

			 * reached by the P9 path because the old path

			 * handles this case in realmode hcall handlers.

			 *

			 * Radix guests can not run PR KVM or nested HV hash

			 * guests which might run PR KVM, so this is always

			 * a privilege fault. Send a program check to guest

			 * kernel.

			 */

			if (!kvmhv_vcpu_is_radix(vcpu)) {

				/*

				 * A guest could be running PR KVM, so this

				 * may be a PR KVM hcall. It must be reflected

				 * to the guest kernel as a sc interrupt.

				 */

				kvmppc_core_queue_syscall(vcpu);

			} else {

				/*

				 * Radix guests can not run PR KVM or nested HV

				 * hash guests which might run PR KVM, so this

				 * is always a privilege fault. Send a program

				 * check to guest kernel.

				 */

				kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV);

			}

			r = RESUME_GUEST;

			break;

		}