From: "Michael S. Tsirkin" <mst@redhat.com>
To: qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>,
Eduardo Habkost <ehabkost@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
Julia Suvorova <jusual@redhat.com>,
Igor Mammedov <imammedo@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
David Gibson <david@gibson.dropbear.id.au>
Subject: [PULL 05/23] hw/acpi/ich9: Set ACPI PCI hot-plug as default on Q35
Date: Tue, 13 Jul 2021 18:10:19 -0400 [thread overview]
Message-ID: <20210713220946.212562-6-mst@redhat.com> (raw)
In-Reply-To: <20210713220946.212562-1-mst@redhat.com>
From: Julia Suvorova <jusual@redhat.com>
Q35 has three different types of PCI devices hot-plug: PCIe Native,
SHPC Native and ACPI hot-plug. This patch changes the default choice
for cold-plugged bridges from PCIe Native to ACPI Hot-plug with
ability to use SHPC and PCIe Native for hot-plugged bridges.
This is a list of the PCIe Native hot-plug issues that led to this
change:
* no racy behavior during boot (see 110c477c2ed)
* no delay during deleting - after the actual power off software
must wait at least 1 second before indicating about it. This case
is quite important for users, it even has its own bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1594168
* no timer-based behavior - in addition to the previous example,
the attention button has a 5-second waiting period, during which
the operation can be canceled with a second press. While this
looks fine for manual button control, automation will result in
the need to queue or drop events, and the software receiving
events in all sort of unspecified combinations of attention/power
indicator states, which is racy and uppredictable.
* fixes:
* https://bugzilla.redhat.com/show_bug.cgi?id=1752465
* https://bugzilla.redhat.com/show_bug.cgi?id=1690256
To return to PCIe Native hot-plug:
-global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off
Known issue: older linux guests need the following flag
to allow hotplugged pci express devices to use io:
-device pcie-root-port,io-reserve=4096.
io is unusual for pci express so this seems minor.
We'll fix this by a follow up patch.
Signed-off-by: Julia Suvorova <jusual@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20210713004205.775386-6-jusual@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
---
hw/acpi/ich9.c | 2 +-
hw/i386/pc.c | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index 2f4eb453ac..778e27b659 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -427,7 +427,7 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)
pm->disable_s3 = 0;
pm->disable_s4 = 0;
pm->s4_val = 2;
- pm->use_acpi_hotplug_bridge = false;
+ pm->use_acpi_hotplug_bridge = true;
object_property_add_uint32_ptr(obj, ACPI_PM_PROP_PM_IO_BASE,
&pm->pm_io_base, OBJ_PROP_FLAG_READ);
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 8e1220db72..7e03848792 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -98,6 +98,7 @@ GlobalProperty pc_compat_6_0[] = {
{ "qemu64" "-" TYPE_X86_CPU, "family", "6" },
{ "qemu64" "-" TYPE_X86_CPU, "model", "6" },
{ "qemu64" "-" TYPE_X86_CPU, "stepping", "3" },
+ { "ICH9-LPC", "acpi-pci-hotplug-with-bridge-support", "off" },
};
const size_t pc_compat_6_0_len = G_N_ELEMENTS(pc_compat_6_0);
--
MST
next prev parent reply other threads:[~2021-07-13 22:15 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-13 22:10 [PULL 00/23] pc,pci,virtio: lots of new features Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 01/23] hw/i386/acpi-build: Add ACPI PCI hot-plug methods to Q35 Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 02/23] hw/acpi/ich9: Enable ACPI PCI hot-plug Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 03/23] hw/pci/pcie: Do not set HPC flag if acpihp is used Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 04/23] bios-tables-test: Allow changes in DSDT ACPI tables Michael S. Tsirkin
2021-07-13 22:10 ` Michael S. Tsirkin [this message]
2021-07-13 22:10 ` [PULL 06/23] bios-tables-test: Update golden binaries Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 07/23] vhost-user-rng: Add vhost-user-rng implementation Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 08/23] vhost-user-rng-pci: Add vhost-user-rng-pci implementation Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 09/23] vhost-user-rng: backend: Add RNG vhost-user daemon implementation Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 10/23] docs: Add documentation for vhost based RNG implementation Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 11/23] hw/virtio: add boilerplate for vhost-user-i2c device Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 12/23] hw/virtio: add vhost-user-i2c-pci boilerplate Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 13/23] docs: Add '-device intel-iommu' entry Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 14/23] hw/pci/pci_host: Allow PCI host to bypass iommu Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 15/23] hw/pxb: Add a bypass iommu property Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 16/23] hw/arm/virt: Add default_bus_bypass_iommu machine option Michael S. Tsirkin
2021-07-13 22:10 ` [PULL 17/23] hw/i386: Add a default_bus_bypass_iommu pc " Michael S. Tsirkin
2021-07-13 22:11 ` [PULL 18/23] hw/pci: Add pci_bus_range() to get PCI bus number range Michael S. Tsirkin
2021-07-13 22:11 ` [PULL 19/23] hw/arm/virt-acpi-build: Add IORT support to bypass SMMUv3 Michael S. Tsirkin
2021-07-13 22:11 ` [PULL 20/23] hw/i386/acpi-build: Add DMAR support to bypass iommu Michael S. Tsirkin
2021-07-13 22:11 ` [PULL 21/23] hw/i386/acpi-build: Add IVRS " Michael S. Tsirkin
2021-07-13 22:11 ` [PULL 22/23] docs: Add documentation for iommu bypass Michael S. Tsirkin
2021-07-13 22:11 ` [PULL 23/23] vhost-vsock: SOCK_SEQPACKET feature bit support Michael S. Tsirkin
2021-07-14 20:31 ` [PULL 00/23] pc,pci,virtio: lots of new features Peter Maydell
2021-07-15 8:54 ` Marcel Apfelbaum
2021-07-15 14:38 ` Michael S. Tsirkin
2021-07-15 21:21 ` Michael S. Tsirkin
2021-07-16 6:41 ` Peter Maydell
2021-07-16 8:41 ` Michael S. Tsirkin
2021-07-16 14:12 ` Peter Maydell
2021-07-16 15:09 ` Michael S. Tsirkin
2021-07-16 15:13 ` Michael S. Tsirkin
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