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[203.219.189.129]) by smtp.gmail.com with ESMTPSA id i6-20020a1709026ac600b001aadfdfcd06sm10356136plt.299.2023.05.16.02.41.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 May 2023 02:41:29 -0700 (PDT) Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 16 May 2023 19:41:24 +1000 Message-Id: Cc: , "Harsh Prateek Bora" Subject: Re: [PATCH v4] target/ppc: Add POWER9 DD2.2 model From: "Nicholas Piggin" To: "Frederic Barrat" , X-Mailer: aerc 0.14.0 References: <20230515160201.394587-1-npiggin@gmail.com> <24568628-f3d8-6d14-6bd3-80fda8f45734@linux.ibm.com> In-Reply-To: <24568628-f3d8-6d14-6bd3-80fda8f45734@linux.ibm.com> Received-SPF: pass client-ip=2607:f8b0:4864:20::430; envelope-from=npiggin@gmail.com; helo=mail-pf1-x430.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Tue May 16, 2023 at 5:58 PM AEST, Frederic Barrat wrote: > > > On 15/05/2023 18:02, Nicholas Piggin wrote: > > POWER9 DD2.1 and earlier had significant limitations when running KVM, > > including lack of "mixed mode" MMU support (ability to run HPT and RPT > > mode on threads of the same core), and a translation prefetch issue > > which is worked around by disabling "AIL" mode for the guest. > >=20 > > These processors are not widely available, and it's difficult to deal > > with all these quirks in qemu +/- KVM, so create a POWER9 DD2.2 CPU > > and make it the default POWER9 CPU. > >=20 > > Signed-off-by: Nicholas Piggin > > --- > > > I almost forgot: the patch doesn't apply cleanly on latest upstream. Oh, some fuzz due to needing the PVR patch I think. Thanks, Nick