[PATCH kernel] KVM: PPC: Fix nested guest RC bits update

Before commit 6cdf30375f82 ("powerpc/kvm/book3s: Use kvm helpers
to walk shadow or secondary table") we called __find_linux_pte() with
a page table pointer from a kvm_nested_guest struct but
now we rely on kvmhv_find_nested() which takes an L1 LPID and returns
a kvm_nested_guest pointer, however we pass a L0 LPID there and
the L2 guest hangs.

This fixes the LPID passed to kvmppc_hv_handle_set_rc().

Fixes: 6cdf30375f82 ("powerpc/kvm/book3s: Use kvm helpers to walk shadow or secondary table")
Signed-off-by: Alexey Kardashevskiy <redacted>
---
 arch/powerpc/kvm/book3s_hv_nested.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index 99011f1b772a..f36f0a2993c0 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c

@@ -1234,7 +1234,7 @@ static long kvmhv_handle_nested_set_rc(struct kvm_vcpu *vcpu,
 
 	/* Set the rc bit in the pte of the shadow_pgtable for the nest guest */
 	ret = kvmppc_hv_handle_set_rc(kvm, true, writing,
-				      n_gpa, gp->shadow_lpid);
+				      n_gpa, gp->l1_lpid);
 	if (!ret)
 		ret = -EINVAL;
 	else

-- 
2.17.1

On Thu, 11 Jun 2020 13:05:59 +1000, Alexey Kardashevskiy wrote:

Before commit 6cdf30375f82 ("powerpc/kvm/book3s: Use kvm helpers
to walk shadow or secondary table") we called __find_linux_pte() with
a page table pointer from a kvm_nested_guest struct but
now we rely on kvmhv_find_nested() which takes an L1 LPID and returns
a kvm_nested_guest pointer, however we pass a L0 LPID there and
the L2 guest hangs.

[...]

Applied to powerpc/fixes.

[1/1] KVM: PPC: Fix nested guest RC bits update
      https://git.kernel.org/powerpc/c/e881bfaf5a5f409390973e076333281465f2b0d9

cheers