From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Paul Mackerras <paulus@ozlabs.org>,
kvm@vger.kernel.org, linuxppc-dev@ozlabs.org
Cc: kvm-ppc@vger.kernel.org
Subject: Re: [v2, 1/5] powerpc: Add CPU feature bits for TM bug workarounds on POWER9 v2.2
Date: Mon, 26 Mar 2018 19:57:00 +1100 (AEDT) [thread overview]
Message-ID: <408p1869Nqz9s1b@ozlabs.org> (raw)
In-Reply-To: <1521628323-14451-2-git-send-email-paulus@ozlabs.org>
On Wed, 2018-03-21 at 10:31:59 UTC, Paul Mackerras wrote:
> This adds a CPU feature bit which is set for POWER9 "Nimbus" DD2.2
> processors which will be used to enable the hypervisor to assist
> hardware with the handling of checkpointed register values while the
> CPU is in suspend state, in order to work around hardware bugs. The
> hardware assistance for these workarounds introduced a new hardware
> bug relating to the XER[SO] bit. We add a separate feature bit for
> this bug in case future chips fix it while still requiring the
> hypervisor assistance with suspend state.
>
> When the dt_cpu_ftrs subsystem is in use, the software assistance can
> be enabled using a "tm-suspend-hypervisor-assist" node in the device
> tree, and a "tm-suspend-xer-so-bug" node enables the workarounds for
> the XER[SO] bug. In the absence of such nodes, a quirk enables both
> for POWER9 "Nimbus" DD2.2 processors.
>
> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Series applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/b5af4f2793233cf37596e2c1f7b233
cheers
next prev parent reply other threads:[~2018-03-26 8:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-21 10:31 [PATCH v2 0/5] KVM & powerpc: Work around POWER9 TM hardware bugs Paul Mackerras
2018-03-21 10:31 ` [PATCH v2 1/5] powerpc: Add CPU feature bits for TM bug workarounds on POWER9 v2.2 Paul Mackerras
2018-03-26 8:57 ` Michael Ellerman [this message]
2018-03-21 10:32 ` [PATCH v2 2/5] powerpc/powernv: Provide a way to force a core into SMT4 mode Paul Mackerras
2018-03-21 10:32 ` [PATCH v2 3/5] KVM: PPC: Book3S HV: Work around transactional memory bugs in POWER9 Paul Mackerras
2018-03-21 10:32 ` [PATCH v2 4/5] KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode Paul Mackerras
2018-03-21 10:32 ` [PATCH v2 5/5] KVM: PPC: Book3S HV: Work around TEXASR bug in fake suspend state Paul Mackerras
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