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Tue, 06 Aug 2024 06:13:47 -0700 (PDT) From: Nicholas Piggin To: qemu-ppc@nongnu.org Cc: Nicholas Piggin , qemu-devel@nongnu.org Subject: [PATCH 5/7] target/ppc: Fix doorbell delivery to threads in powersave Date: Tue, 6 Aug 2024 23:13:15 +1000 Message-ID: <20240806131318.275109-6-npiggin@gmail.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240806131318.275109-1-npiggin@gmail.com> References: <20240806131318.275109-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::62a; envelope-from=npiggin@gmail.com; helo=mail-pl1-x62a.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 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1722950087743116600 Content-Type: text/plain; charset="utf-8" Doorbell exceptions are not not cleared when they cause a wake from powersave state, only when they take the corresponding interrupt. The sreset-on-wake logic must avoid clearing the interrupt in this case. Signed-off-by: Nicholas Piggin --- target/ppc/excp_helper.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index 701abe1b6d..b619a6adde 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -2237,7 +2237,9 @@ static void p8_deliver_interrupt(CPUPPCState *env, in= t interrupt) powerpc_excp(cpu, POWERPC_EXCP_DECR); break; case PPC_INTERRUPT_DOORBELL: - env->pending_interrupts &=3D ~PPC_INTERRUPT_DOORBELL; + if (!env->resume_as_sreset) { + env->pending_interrupts &=3D ~PPC_INTERRUPT_DOORBELL; + } if (is_book3s_arch2x(env)) { powerpc_excp(cpu, POWERPC_EXCP_SDOOR); } else { @@ -2245,7 +2247,9 @@ static void p8_deliver_interrupt(CPUPPCState *env, in= t interrupt) } break; case PPC_INTERRUPT_HDOORBELL: - env->pending_interrupts &=3D ~PPC_INTERRUPT_HDOORBELL; + if (!env->resume_as_sreset) { + env->pending_interrupts &=3D ~PPC_INTERRUPT_HDOORBELL; + } powerpc_excp(cpu, POWERPC_EXCP_SDOOR_HV); break; case PPC_INTERRUPT_PERFM: @@ -2301,6 +2305,7 @@ static void p9_deliver_interrupt(CPUPPCState *env, in= t interrupt) =20 case PPC_INTERRUPT_HDECR: /* Hypervisor decrementer exception */ /* HDEC clears on delivery */ + /* XXX: should not see an HDEC if resume_as_sreset. assert? */ env->pending_interrupts &=3D ~PPC_INTERRUPT_HDECR; powerpc_excp(cpu, POWERPC_EXCP_HDECR); break; @@ -2320,11 +2325,15 @@ static void p9_deliver_interrupt(CPUPPCState *env, = int interrupt) powerpc_excp(cpu, POWERPC_EXCP_DECR); break; case PPC_INTERRUPT_DOORBELL: - env->pending_interrupts &=3D ~PPC_INTERRUPT_DOORBELL; + if (!env->resume_as_sreset) { + env->pending_interrupts &=3D ~PPC_INTERRUPT_DOORBELL; + } powerpc_excp(cpu, POWERPC_EXCP_SDOOR); break; case PPC_INTERRUPT_HDOORBELL: - env->pending_interrupts &=3D ~PPC_INTERRUPT_HDOORBELL; + if (!env->resume_as_sreset) { + env->pending_interrupts &=3D ~PPC_INTERRUPT_HDOORBELL; + } powerpc_excp(cpu, POWERPC_EXCP_SDOOR_HV); break; case PPC_INTERRUPT_PERFM: --=20 2.45.2