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Tsirkin" Subject: [PULL 23/28] acpi: mark PMTIMER as unlocked Date: Fri, 29 Aug 2025 14:59:30 +0200 Message-ID: <20250829125935.1526984-24-pbonzini@redhat.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250829125935.1526984-1-pbonzini@redhat.com> References: <20250829125935.1526984-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Igor Mammedov Reading QEMU_CLOCK_VIRTUAL is thread-safe, write access is NOP. This makes possible to boot Windows with large vCPUs count when hv-time is not used. Reproducer: -M q35,hpet=off -cpu host -enable-kvm -smp 240,sockets=4 -m 8G WS2025.img fails to boot within 30min. With this fix it boots within 2-1min. Signed-off-by: Igor Mammedov Reviewed-by: Peter Xu Acked-by: Michael S. Tsirkin Link: https://lore.kernel.org/r/20250814160600.2327672-3-imammedo@redhat.com Signed-off-by: Paolo Bonzini --- hw/acpi/core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/acpi/core.c b/hw/acpi/core.c index 58f8964e130..ff165828033 100644 --- a/hw/acpi/core.c +++ b/hw/acpi/core.c @@ -547,6 +547,7 @@ void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci, ar->tmr.timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, acpi_pm_tmr_timer, ar); memory_region_init_io(&ar->tmr.io, memory_region_owner(parent), &acpi_pm_tmr_ops, ar, "acpi-tmr", 4); + memory_region_enable_lockless_io(&ar->tmr.io); memory_region_add_subregion(parent, 8, &ar->tmr.io); } -- 2.51.0