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KVM: PPC: Book3S HV P9: Reflect userspace hcalls to hash guests to support PR KVM

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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: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-30-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-05-28 19:07:49 +10:00 committed by Michael Ellerman
parent 6165d5dd99
commit ac3c8b41c2
1 changed files with 16 additions and 6 deletions
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22
arch/powerpc/kvm/book3s_hv.c
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@ -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.
*/
kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV);
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;
}