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Date: Thu, 22 Aug 2013 19:58:58 +0200
From: =?ISO-8859-15?Q?Andreas_F=E4rber?= <afaerber@suse.de>
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Subject: Re: [Qemu-devel] [PATCH -V2 1/4] target-ppc: Update slb array with
 correct index values.
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To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Alexander Graf <agraf@suse.de>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>, qemu-ppc@nongnu.org, qemu-devel@nongnu.org

Am 20.08.2013 12:49, schrieb Aneesh Kumar K.V:
> From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
>=20
> Without this, a value of rb=3D0 and rs=3D0 results in replacing the 0th
> index. This can be observed when using gdb remote debugging support.
>=20
> (gdb) x/10i do_fork
>    0xc000000000085330 <do_fork>:        Cannot access memory at address=
 0xc000000000085330
> (gdb)
>=20
> This is because when we do the slb sync via kvm_cpu_synchronize_state,
> we overwrite the slb entry (0th entry) for 0xc000000000085330
>=20
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> ---
>  target-ppc/kvm.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
>=20
> diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
> index 30a870e..a629447 100644
> --- a/target-ppc/kvm.c
> +++ b/target-ppc/kvm.c
> @@ -1034,8 +1034,18 @@ int kvm_arch_get_registers(CPUState *cs)
>          /* Sync SLB */
>  #ifdef TARGET_PPC64
>          for (i =3D 0; i < 64; i++) {
> -            ppc_store_slb(env, sregs.u.s.ppc64.slb[i].slbe,
> -                               sregs.u.s.ppc64.slb[i].slbv);
> +            target_ulong rb =3D sregs.u.s.ppc64.slb[i].slbe;
> +            /*
> +             * KVM_GET_SREGS doesn't retun slb entry with slot informa=
tion

Still has the "return" typo - maybe Alex can fix if he applies it.

Andreas

> +             * same as index. So don't depend on the slot information =
in
> +             * the returned value.
> +             */
> +            rb &=3D ~0xfff;
> +            /*
> +             * use the array index as the slot
> +             */
> +            rb |=3D i;
> +            ppc_store_slb(env, rb, sregs.u.s.ppc64.slb[i].slbv);
>          }
>  #endif
> =20
>=20


--=20
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