i386, accel, memory patches for 2025-08-29

[PULL 23/28] acpi: mark PMTIMER as unlocked

Paolo Bonzini posted 28 patches 1 month ago

Download mbox

Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Riku Voipio <riku.voipio@iki.fi>, "Michael S. Tsirkin" <mst@redhat.com>, Igor Mammedov <imammedo@redhat.com>, Ani Sinha <anisinha@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Eduardo Habkost <eduardo@habkost.net>, Thomas Huth <thuth@redhat.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, David Hildenbrand <david@redhat.com>, Jason Herne <jjherne@linux.ibm.com>, Stafford Horne <shorne@gmail.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Yanan Wang <wangyanan55@huawei.com>, Zhao Liu <zhao1.liu@intel.com>, Peter Xu <peterx@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Alexander Graf <agraf@csgraf.de>, Mads Ynddal <mads@ynddal.dk>, Michael Rolnik <mrolnik@gmail.com>, Helge Deller <deller@gmx.de>, Cameron Esfahani <dirty@apple.com>, Roman Bolshakov <rbolshakov@ddn.com>, Phil Dennis-Jordan <phil@philjordan.eu>, Marcelo Tosatti <mtosatti@redhat.com>, Reinoud Zandijk <reinoud@netbsd.org>, Sunil Muthuswamy <sunilmut@microsoft.com>, Song Gao <gaosong@loongson.cn>, Laurent Vivier <laurent@vivier.eu>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Aurelien Jarno <aurelien@aurel32.net>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Aleksandar Rikalo <arikalo@gmail.com>, Huacai Chen <chenhuacai@kernel.org>, Nicholas Piggin <npiggin@gmail.com>, Chinmay Rath <rathc@linux.ibm.com>, Harsh Prateek Bora <harshpb@linux.ibm.com>, Yoshinori Sato <yoshinori.sato@nifty.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Artyom Tarasenko <atar4qemu@gmail.com>

Expand all Fold all

[PULL 23/28] acpi: mark PMTIMER as unlocked

Posted by Paolo Bonzini 1 month ago

From: Igor Mammedov <imammedo@redhat.com>

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 <imammedo@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/20250814160600.2327672-3-imammedo@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 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