* [PATCH kernel] KVM: PPC: Fix nested guest RC bits update
@ 2020-06-11 3:05 Alexey Kardashevskiy
2020-06-12 22:49 ` Michael Ellerman
0 siblings, 1 reply; 2+ messages in thread
From: Alexey Kardashevskiy @ 2020-06-11 3:05 UTC (permalink / raw)
To: linuxppc-dev
Cc: Alexey Kardashevskiy, Aneesh Kumar K.V, kvm-ppc, David Gibson
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 <aik@ozlabs.ru>
---
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH kernel] KVM: PPC: Fix nested guest RC bits update
2020-06-11 3:05 [PATCH kernel] KVM: PPC: Fix nested guest RC bits update Alexey Kardashevskiy
@ 2020-06-12 22:49 ` Michael Ellerman
0 siblings, 0 replies; 2+ messages in thread
From: Michael Ellerman @ 2020-06-12 22:49 UTC (permalink / raw)
To: Alexey Kardashevskiy, linuxppc-dev
Cc: Aneesh Kumar K.V, kvm-ppc, David Gibson
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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