From: Anton Blanchard <anton@samba.org>
To: Alexey Kardashevskiy <aik@ozlabs.ru>,
Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Michael Neuling <mikey@neuling.org>,
David Gibson <david@gibson.dropbear.id.au>,
Alexander Graf <agraf@suse.de>
Cc: qemu-ppc@nongnu.org, linuxppc-dev@lists.ozlabs.org,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] PR KVM and TM issues
Date: Mon, 4 Apr 2016 20:43:46 +1000 [thread overview]
Message-ID: <20160404204346.1cf44df8@kryten> (raw)
In-Reply-To: <57021123.6050506@ozlabs.ru>
Hi Alexey,
> > I can't get an Ubuntu Wily guest to boot on an Ubuntu Wily host in
> > PR KVM mode. The kernel in both cases is 4.2. To reproduce:
> >
> > wget -N https://cloud-images.ubuntu.com/wily/current/wily-server-cloudimg-ppc64el-disk1.img
> >
> > qemu-system-ppc64 -cpu POWER8 -enable-kvm -machine pseries,kvm-type=PR -m 4G -nographic -vga none -drive file=wily-server-cloudimg-ppc64el-disk1.img,if=virtio
> >
> > Should TM work inside a PR KVM guest?
>
> If I read the kernel code correctly (kvmppc_set_one_reg_hv vs.
> kvmppc_set_one_reg_pr), no, it should not be expected to work.
I see a couple of issues, patches to follow:
1. QEMU needs to clear the TM feature bit in the ibm,pa-features array
when running in PR KVM mode.
2. Linux needs to clear the user TM feature bits if TM gets disabled
at runtime via the ibm,pa-features bit.
Anton
next parent reply other threads:[~2016-04-04 10:44 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160404164457.539a55f0@kryten>
[not found] ` <57021123.6050506@ozlabs.ru>
2016-04-04 10:43 ` Anton Blanchard [this message]
2016-04-04 11:09 ` [Qemu-devel] [PATCH] spapr: Don't set the TM ibm, pa-features bit in PR KVM mode Anton Blanchard
2016-04-04 11:13 ` Alexander Graf
2016-04-30 0:48 ` [Qemu-devel] [PATCH v2] " Anton Blanchard
2016-05-02 9:36 ` haris iqbal
2016-05-27 4:52 ` David Gibson
2016-06-07 12:28 ` [Qemu-devel] [PATCH 1/2] Add PowerPC AT_HWCAP2 definitions Anton Blanchard
2016-06-07 12:32 ` [Qemu-devel] [PATCH 2/2] spapr: Better handling of ibm, pa-features TM bit Anton Blanchard
2016-06-08 2:26 ` David Gibson
2016-07-05 5:19 ` [Qemu-devel] [PATCH 0/3] Rework " Sam Bobroff
2016-07-05 5:19 ` [Qemu-devel] [PATCH 1/3] spapr: Disable ibm, pa-features HTM bit Sam Bobroff
2016-07-05 5:51 ` David Gibson
2016-07-05 5:19 ` [Qemu-devel] [PATCH 2/3] Add KVM_CAP_PPC_HTM to linux/kvm.h Sam Bobroff
2016-07-05 6:05 ` David Gibson
2016-07-06 4:41 ` Sam Bobroff
2016-07-06 5:09 ` David Gibson
2016-07-05 5:19 ` [Qemu-devel] [PATCH 3/3] spapr: Set ibm, pa-features HTM from KVM_CAP_PPC_HTM Sam Bobroff
2016-07-05 6:52 ` David Gibson
2016-07-06 5:35 ` [Qemu-devel] [PATCH v2 0/3] Rework spapr: Better handling of ibm, pa-features TM bit Sam Bobroff
2016-07-06 5:35 ` [Qemu-devel] [PATCH v2 1/3] spapr: Disable ibm, pa-features HTM bit Sam Bobroff
2016-07-07 4:38 ` David Gibson
2016-07-06 5:35 ` [Qemu-devel] [PATCH v2 2/3] Add KVM_CAP_PPC_HTM to linux/kvm.h Sam Bobroff
2016-07-07 4:38 ` David Gibson
2016-07-06 5:35 ` [Qemu-devel] [PATCH v2 3/3] spapr: Set ibm, pa-features HTM from KVM_CAP_PPC_HTM Sam Bobroff
2016-07-07 4:39 ` David Gibson
2016-06-08 2:19 ` [Qemu-devel] [PATCH 1/2] Add PowerPC AT_HWCAP2 definitions David Gibson
2016-04-05 2:12 ` [Qemu-devel] [PATCH] spapr: Don't set the TM ibm, pa-features bit in PR KVM mode Paul Mackerras
2016-04-05 4:09 ` David Gibson
2016-04-05 7:33 ` Alexey Kardashevskiy
2016-04-04 11:11 ` [Qemu-devel] [PATCH] powerpc: Clear user CPU feature bits if TM is disabled at runtime Anton Blanchard
2016-04-05 0:52 ` David Gibson
2016-04-05 9:35 ` [Qemu-devel] " Michael Ellerman
2016-04-05 9:56 ` Benjamin Herrenschmidt
2016-04-05 22:40 ` Michael Ellerman
2016-04-15 2:06 ` [Qemu-devel] [PATCH 1/3] powerpc: scan_features() updates incorrect bits Anton Blanchard
2016-04-15 14:27 ` [Qemu-devel] [1/3] " Michael Ellerman
2016-04-18 4:40 ` Michael Ellerman
2016-04-18 4:16 ` Michael Ellerman
2016-04-18 10:36 ` [Qemu-devel] [PATCH v2 1/3] powerpc: scan_features() updates incorrect bits for REAL_LE Michael Ellerman
2016-04-19 10:09 ` [Qemu-devel] [v2, " Michael Ellerman
2016-04-15 2:07 ` [Qemu-devel] [PATCH 2/3] powerpc: Update cpu_user_features2 in scan_features() Anton Blanchard
2016-04-19 10:09 ` [Qemu-devel] [2/3] " Michael Ellerman
2016-04-15 2:08 ` [Qemu-devel] [PATCH 3/3] powerpc: Update TM user feature bits " Anton Blanchard
2016-04-19 10:09 ` [Qemu-devel] [3/3] " Michael Ellerman
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