Re: [PATCH v3 17/41] KVM: PPC: Book3S HV P9: implement kvmppc_xive_pull_vcpu in C

Excerpts from Cédric Le Goater's message of March 23, 2021 2:19 am:

On 3/5/21 4:06 PM, Nicholas Piggin wrote:

quoted

This is more symmetric with kvmppc_xive_push_vcpu. The extra test in
the asm will go away in a later change.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Reviewed-by: Cédric Le Goater <clg@kaod.org>

quoted

diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c
index e7219b6f5f9a..52cdb9e2660a 100644
--- a/arch/powerpc/kvm/book3s_xive.c
+++ b/arch/powerpc/kvm/book3s_xive.c

@@ -127,6 +127,37 @@ void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvmppc_xive_push_vcpu);
 
+/*
+ * Pull a vcpu's context from the XIVE on guest exit.
+ * This assumes we are in virtual mode (MMU on)

should we add an assert on is_rm() ? 

I thought the same thing at first, but I think it should be okay.
kvmppc_xive_push_cpu does not have an assert, and in the next
patch the push and pull get moved out to where it is much clearer
to see the MMU is on.

Thanks,
Nick