From: Paolo Bonzini <pbonzini@redhat.com>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Alexander Graf <agraf@suse.de>,
qemu-devel@nongnu.org, qemu-ppc@nongnu.org,
Paul Mackerras <paulus@samba.org>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [PATCH] powerpc iommu: enable multiple TCE requests
Date: Sun, 18 Aug 2013 17:22:42 +0200 [thread overview]
Message-ID: <5210E6C2.1070208@redhat.com> (raw)
In-Reply-To: <520DF5B5.4050805@ozlabs.ru>
Il 16/08/2013 11:49, Alexey Kardashevskiy ha scritto:
> With KVM, we could fall back to the qemu implementation
>> + * when KVM doesn't support them, but that would be much slower
>> + * than just using the KVM implementations of the single TCE
>> + * hypercalls. */
>> + if (kvmppc_spapr_use_multitce()) {
>> + _FDT((fdt_property(fdt, "ibm,hypertas-functions", hypertas_propm,
>> + sizeof(hypertas_propm))));
>> + } else {
>> + _FDT((fdt_property(fdt, "ibm,hypertas-functions", hypertas_prop,
>> + sizeof(hypertas_prop))));
>> + }
This prevents migration from newer kernel to older kernel. Can you
ensure that the fallback to the QEMU implementation works, even though
it is not used in practice?
Paolo
next prev parent reply other threads:[~2013-08-18 15:23 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-07 8:08 [Qemu-devel] [PATCH] powerpc iommu: enable multiple TCE requests Alexey Kardashevskiy
2013-08-16 9:49 ` Alexey Kardashevskiy
2013-08-18 15:22 ` Paolo Bonzini [this message]
2013-08-19 7:30 ` Alexey Kardashevskiy
2013-08-19 8:01 ` Alexander Graf
2013-08-19 8:44 ` Alexey Kardashevskiy
2013-08-19 9:47 ` Paolo Bonzini
2013-08-20 1:36 ` Alexey Kardashevskiy
2013-08-20 6:55 ` Alexander Graf
2013-08-20 8:39 ` Paolo Bonzini
2013-08-20 8:49 ` Alexey Kardashevskiy
2013-08-20 9:09 ` Paolo Bonzini
2013-08-20 9:13 ` Benjamin Herrenschmidt
2013-08-20 9:15 ` Paolo Bonzini
2013-08-20 9:20 ` Benjamin Herrenschmidt
2013-08-20 9:22 ` Paolo Bonzini
2013-08-20 9:26 ` Benjamin Herrenschmidt
2013-08-20 10:14 ` Paolo Bonzini
2013-08-20 11:38 ` Benjamin Herrenschmidt
2013-08-21 7:11 ` Alexander Graf
2013-08-21 7:29 ` [Qemu-devel] [Qemu-ppc] " Alexander Graf
2013-08-16 13:15 ` [Qemu-devel] " Alexander Graf
2013-08-19 9:01 ` Alexey Kardashevskiy
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