thr3ads.net - Linux Virtualization - [PATCH v3 2/6] PCI: Scan all functions when running over Jailhouse [Mar 2018]

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Jan Kiszka

2018-Mar-01 05:40 UTC

[PATCH v3 0/6] jailhouse: Enhance secondary Jailhouse guest support /wrt PCI

Basic x86 support [1] for running Linux as secondary Jailhouse [2] guest
is currently pending in the tip tree. This builds on top and enhances
the PCI support for x86 and also ARM guests (ARM[64] does not require
platform patches and works already).

Key elements of this series are:
 - detection of Jailhouse via device tree hypervisor node
 - function-level PCI scan if Jailhouse is detected
 - MMCONFIG support for x86 guests

As most changes affect x86, I would suggest to route the series also via
tip after the necessary acks are collected.

Changes in v3:
 - avoided duplicate scans of PCI functions under Jailhouse
 - reformated PCI_MMCONFIG condition and rephrase related commit log

Changes in v2:
 - adjusted commit log and include ordering in patch 2
 - rebased over Linus master

Jan

[1] https://lkml.org/lkml/2017/11/27/125
[2] http://jailhouse-project.org

CC: Benedikt Spranger <b.spranger at linutronix.de>
CC: Mark Rutland <mark.rutland at arm.com>
CC: Otavio Pontes <otavio.pontes at intel.com>
CC: Rob Herring <robh+dt at kernel.org>

Jan Kiszka (5):
  jailhouse: Provide detection for non-x86 systems
  PCI: Scan all functions when running over Jailhouse
  x86: Consolidate PCI_MMCONFIG configs
  x86/jailhouse: Allow to use PCI_MMCONFIG without ACPI
  MAINTAINERS: Add entry for Jailhouse

Otavio Pontes (1):
  x86/jailhouse: Enable PCI mmconfig access in inmates

 Documentation/devicetree/bindings/jailhouse.txt |  8 ++++++++
 MAINTAINERS                                     |  7 +++++++
 arch/x86/Kconfig                                | 11 ++++++-----
 arch/x86/include/asm/jailhouse_para.h           |  2 +-
 arch/x86/include/asm/pci_x86.h                  |  2 ++
 arch/x86/kernel/Makefile                        |  2 +-
 arch/x86/kernel/cpu/amd.c                       |  2 +-
 arch/x86/kernel/jailhouse.c                     |  7 +++++++
 arch/x86/pci/legacy.c                           |  4 +++-
 arch/x86/pci/mmconfig-shared.c                  |  4 ++--
 drivers/pci/probe.c                             | 22 +++++++++++++++++++---
 include/linux/hypervisor.h                      | 17 +++++++++++++++--
 12 files changed, 72 insertions(+), 16 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/jailhouse.txt

-- 
2.13.6

Jan Kiszka

2018-Mar-01 05:40 UTC

head link

[PATCH v3 1/6] jailhouse: Provide detection for non-x86 systems

From: Jan Kiszka <jan.kiszka at siemens.com>

Implement jailhouse_paravirt() via device tree probing on architectures
!= x86. Will be used by the PCI core.

CC: Rob Herring <robh+dt at kernel.org>
CC: Mark Rutland <mark.rutland at arm.com>
Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
---
 Documentation/devicetree/bindings/jailhouse.txt |  8 ++++++++
 arch/x86/include/asm/jailhouse_para.h           |  2 +-
 include/linux/hypervisor.h                      | 17 +++++++++++++++--
 3 files changed, 24 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/jailhouse.txt

diff --git a/Documentation/devicetree/bindings/jailhouse.txt
b/Documentation/devicetree/bindings/jailhouse.txt
new file mode 100644
index 000000000000..2901c25ff340
--- /dev/null
+++ b/Documentation/devicetree/bindings/jailhouse.txt
@@ -0,0 +1,8 @@
+Jailhouse non-root cell device tree bindings
+--------------------------------------------
+
+When running in a non-root Jailhouse cell (partition), the device tree of this
+platform shall have a top-level "hypervisor" node with the following
+properties:
+
+- compatible = "jailhouse,cell"
diff --git a/arch/x86/include/asm/jailhouse_para.h
b/arch/x86/include/asm/jailhouse_para.h
index 875b54376689..b885a961a150 100644
--- a/arch/x86/include/asm/jailhouse_para.h
+++ b/arch/x86/include/asm/jailhouse_para.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL2.0 */
 
 /*
- * Jailhouse paravirt_ops implementation
+ * Jailhouse paravirt detection
  *
  * Copyright (c) Siemens AG, 2015-2017
  *
diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h
index b19563f9a8eb..fc08b433c856 100644
--- a/include/linux/hypervisor.h
+++ b/include/linux/hypervisor.h
@@ -8,15 +8,28 @@
  */
 
 #ifdef CONFIG_X86
+
+#include <asm/jailhouse_para.h>
 #include <asm/x86_init.h>
+
 static inline void hypervisor_pin_vcpu(int cpu)
 {
 	x86_platform.hyper.pin_vcpu(cpu);
 }
-#else
+
+#else /* !CONFIG_X86 */
+
+#include <linux/of.h>
+
 static inline void hypervisor_pin_vcpu(int cpu)
 {
 }
-#endif
+
+static inline bool jailhouse_paravirt(void)
+{
+	return of_find_compatible_node(NULL, NULL, "jailhouse,cell");
+}
+
+#endif /* !CONFIG_X86 */
 
 #endif /* __LINUX_HYPEVISOR_H */
-- 
2.13.6

Jan Kiszka

2018-Mar-01 05:40 UTC

head link

[PATCH v3 2/6] PCI: Scan all functions when running over Jailhouse

From: Jan Kiszka <jan.kiszka at siemens.com>

Per PCIe r4.0, sec 7.5.1.1.9, multi-function devices are required to
have a function 0.  Therefore, Linux scans for devices at function 0
(devfn 0/8/16/...) and only scans for other functions if function 0
has its Multi-Function Device bit set or ARI or SR-IOV indicate
there are more functions.

The Jailhouse hypervisor may pass individual functions of a
multi-function device to a guest without passing function 0, which
means a Linux guest won't find them.

Change Linux PCI probing so it scans all function numbers when
running as a guest over Jailhouse.

This is technically prohibited by the spec, so it is possible that
PCI devices without the Multi-Function Device bit set may have
unexpected behavior in response to this probe.

Derived from original patch by Benedikt Spranger.

CC: Benedikt Spranger <b.spranger at linutronix.de>
Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
Acked-by: Bjorn Helgaas <bhelgaas at google.com>
---
 arch/x86/pci/legacy.c |  4 +++-
 drivers/pci/probe.c   | 22 +++++++++++++++++++---
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index 1cb01abcb1be..dfbe6ac38830 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -4,6 +4,7 @@
 #include <linux/init.h>
 #include <linux/export.h>
 #include <linux/pci.h>
+#include <asm/jailhouse_para.h>
 #include <asm/pci_x86.h>
 
 /*
@@ -34,13 +35,14 @@ int __init pci_legacy_init(void)
 
 void pcibios_scan_specific_bus(int busn)
 {
+	int stride = jailhouse_paravirt() ? 1 : 8;
 	int devfn;
 	u32 l;
 
 	if (pci_find_bus(0, busn))
 		return;
 
-	for (devfn = 0; devfn < 256; devfn += 8) {
+	for (devfn = 0; devfn < 256; devfn += stride) {
 		if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&
 		    l != 0x0000 && l != 0xffff) {
 			DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ef5377438a1e..da22d6d216f8 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -16,6 +16,7 @@
 #include <linux/pci-aspm.h>
 #include <linux/aer.h>
 #include <linux/acpi.h>
+#include <linux/hypervisor.h>
 #include <linux/irqdomain.h>
 #include <linux/pm_runtime.h>
 #include "pci.h"
@@ -2518,14 +2519,29 @@ static unsigned int pci_scan_child_bus_extend(struct
pci_bus *bus,
 {
 	unsigned int used_buses, normal_bridges = 0, hotplug_bridges = 0;
 	unsigned int start = bus->busn_res.start;
-	unsigned int devfn, cmax, max = start;
+	unsigned int devfn, fn, cmax, max = start;
 	struct pci_dev *dev;
+	int nr_devs;
 
 	dev_dbg(&bus->dev, "scanning bus\n");
 
 	/* Go find them, Rover! */
-	for (devfn = 0; devfn < 0x100; devfn += 8)
-		pci_scan_slot(bus, devfn);
+	for (devfn = 0; devfn < 0x100; devfn += 8) {
+		nr_devs = pci_scan_slot(bus, devfn);
+
+		/*
+		 * The Jailhouse hypervisor may pass individual functions of a
+		 * multi-function device to a guest without passing function 0.
+		 * Look for them as well.
+		 */
+		if (jailhouse_paravirt() && nr_devs == 0) {
+			for (fn = 1; fn < 8; fn++) {
+				dev = pci_scan_single_device(bus, devfn + fn);
+				if (dev)
+					dev->multifunction = 1;
+			}
+		}
+	}
 
 	/* Reserve buses for SR-IOV capability */
 	used_buses = pci_iov_bus_range(bus);
-- 
2.13.6

Jan Kiszka

2018-Mar-01 05:40 UTC

head link

[PATCH v3 3/6] x86/jailhouse: Enable PCI mmconfig access in inmates

From: Otavio Pontes <otavio.pontes at intel.com>

Use the PCI mmconfig base address exported by jailhouse in boot
parameters in order to access the memory mapped PCI configuration space.

Signed-off-by: Otavio Pontes <otavio.pontes at intel.com>
[Jan: rebased, fixed !CONFIG_PCI_MMCONFIG]
Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
---
 arch/x86/include/asm/pci_x86.h | 2 ++
 arch/x86/kernel/jailhouse.c    | 7 +++++++
 arch/x86/pci/mmconfig-shared.c | 4 ++--
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index eb66fa9cd0fc..959d618dbb17 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -151,6 +151,8 @@ extern int pci_mmconfig_insert(struct device *dev, u16 seg,
u8 start, u8 end,
 			       phys_addr_t addr);
 extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
+extern struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
+							int end, u64 addr);
 
 extern struct list_head pci_mmcfg_list;
 
diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index b68fd895235a..7fe2a73da0b3 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -124,6 +124,13 @@ static int __init jailhouse_pci_arch_init(void)
 	if (pcibios_last_bus < 0)
 		pcibios_last_bus = 0xff;
 
+#ifdef CONFIG_PCI_MMCONFIG
+	if (setup_data.pci_mmconfig_base) {
+		pci_mmconfig_add(0, 0, 0xff, setup_data.pci_mmconfig_base);
+		pci_mmcfg_arch_init();
+	}
+#endif
+
 	return 0;
 }
 
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 96684d0adcf9..0e590272366b 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -94,8 +94,8 @@ static struct pci_mmcfg_region *pci_mmconfig_alloc(int
segment, int start,
 	return new;
 }
 
-static struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
-							int end, u64 addr)
+struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
+						 int end, u64 addr)
 {
 	struct pci_mmcfg_region *new;
 
-- 
2.13.6

Jan Kiszka

2018-Mar-01 05:40 UTC

head link

[PATCH v3 4/6] x86: Consolidate PCI_MMCONFIG configs

From: Jan Kiszka <jan.kiszka at siemens.com>

Since e279b6c1d329 ("x86: start unification of arch/x86/Kconfig.*"),
we
have two PCI_MMCONFIG entries, one from the original i386 and another
from x86_64. This consolidates both entries into a single one.

The logic for x86_32, where this option was not under user control,
remains identical. On x86_64, PCI_MMCONFIG becomes additionally
configurable for SFI systems even if ACPI was disabled. This just
simplifies the logic without restricting the configurability in any way.

Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
---
 arch/x86/Kconfig | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index eb7f43f23521..aef9d67ac186 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2641,8 +2641,9 @@ config PCI_DIRECT
 	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC
|| PCI_GOMMCONFIG))
 
 config PCI_MMCONFIG
-	def_bool y
-	depends on X86_32 && PCI && (ACPI || SFI) &&
(PCI_GOMMCONFIG || PCI_GOANY)
+	bool "Support mmconfig PCI config space access" if X86_64
+	default y
+	depends on PCI && (ACPI || SFI) && (X86_64 || (PCI_GOANY ||
PCI_GOMMCONFIG))
 
 config PCI_OLPC
 	def_bool y
@@ -2657,10 +2658,6 @@ config PCI_DOMAINS
 	def_bool y
 	depends on PCI
 
-config PCI_MMCONFIG
-	bool "Support mmconfig PCI config space access"
-	depends on X86_64 && PCI && ACPI
-
 config PCI_CNB20LE_QUIRK
 	bool "Read CNB20LE Host Bridge Windows" if EXPERT
 	depends on PCI
-- 
2.13.6

Jan Kiszka

2018-Mar-01 05:40 UTC

head link

[PATCH v3 5/6] x86/jailhouse: Allow to use PCI_MMCONFIG without ACPI

From: Jan Kiszka <jan.kiszka at siemens.com>

Jailhouse does not use ACPI, but it does support MMCONFIG. Make sure the
latter can be built without having to enable ACPI as well. Primarily, we
need to make the AMD mmconf-fam10h_64 depend upon MMCONFIG and ACPI,
instead of just the former.

Saves some bytes in the Jailhouse non-root kernel.

Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
---
 arch/x86/Kconfig          | 6 +++++-
 arch/x86/kernel/Makefile  | 2 +-
 arch/x86/kernel/cpu/amd.c | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index aef9d67ac186..b8e73e748acc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2643,7 +2643,7 @@ config PCI_DIRECT
 config PCI_MMCONFIG
 	bool "Support mmconfig PCI config space access" if X86_64
 	default y
-	depends on PCI && (ACPI || SFI) && (X86_64 || (PCI_GOANY ||
PCI_GOMMCONFIG))
+	depends on PCI && (ACPI || SFI || JAILHOUSE_GUEST) && (X86_64
|| (PCI_GOANY || PCI_GOMMCONFIG))
 
 config PCI_OLPC
 	def_bool y
@@ -2658,6 +2658,10 @@ config PCI_DOMAINS
 	def_bool y
 	depends on PCI
 
+config MMCONF_FAM10H
+	def_bool y
+	depends on PCI_MMCONFIG && ACPI
+
 config PCI_CNB20LE_QUIRK
 	bool "Read CNB20LE Host Bridge Windows" if EXPERT
 	depends on PCI
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 29786c87e864..73ccf80c09a2 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -146,6 +146,6 @@ ifeq ($(CONFIG_X86_64),y)
 	obj-$(CONFIG_GART_IOMMU)	+= amd_gart_64.o aperture_64.o
 	obj-$(CONFIG_CALGARY_IOMMU)	+= pci-calgary_64.o tce_64.o
 
-	obj-$(CONFIG_PCI_MMCONFIG)	+= mmconf-fam10h_64.o
+	obj-$(CONFIG_MMCONF_FAM10H)	+= mmconf-fam10h_64.o
 	obj-y				+= vsmp_64.o
 endif
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index f0e6456ca7d3..12bc0a1139da 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -716,7 +716,7 @@ static void init_amd_k8(struct cpuinfo_x86 *c)
 
 static void init_amd_gh(struct cpuinfo_x86 *c)
 {
-#ifdef CONFIG_X86_64
+#ifdef CONFIG_MMCONF_FAM10H
 	/* do this for boot cpu */
 	if (c == &boot_cpu_data)
 		check_enable_amd_mmconf_dmi();
-- 
2.13.6

Jan Kiszka

2018-Mar-01 05:40 UTC

head link

[PATCH v3 6/6] MAINTAINERS: Add entry for Jailhouse

From: Jan Kiszka <jan.kiszka at siemens.com>

Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
---
 MAINTAINERS | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 93a12af4f180..4b889f282c77 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7521,6 +7521,13 @@ Q:	http://patchwork.linuxtv.org/project/linux-media/list/
 S:	Maintained
 F:	drivers/media/dvb-frontends/ix2505v*
 
+JAILHOUSE HYPERVISOR INTERFACE
+M:	Jan Kiszka <jan.kiszka at siemens.com>
+L:	jailhouse-dev at googlegroups.com
+S:	Maintained
+F:	arch/x86/kernel/jailhouse.c
+F:	arch/x86/include/asm/jailhouse_para.h
+
 JC42.4 TEMPERATURE SENSOR DRIVER
 M:	Guenter Roeck <linux at roeck-us.net>
 L:	linux-hwmon at vger.kernel.org
-- 
2.13.6

Juergen Gross

2018-Mar-01 06:17 UTC

head link

[PATCH v3 1/6] jailhouse: Provide detection for non-x86 systems

On 01/03/18 06:40, Jan Kiszka wrote:> From: Jan Kiszka <jan.kiszka at siemens.com>
> 
> Implement jailhouse_paravirt() via device tree probing on architectures
> != x86. Will be used by the PCI core.
> 
> CC: Rob Herring <robh+dt at kernel.org>
> CC: Mark Rutland <mark.rutland at arm.com>
> Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
> ---
>  Documentation/devicetree/bindings/jailhouse.txt |  8 ++++++++
>  arch/x86/include/asm/jailhouse_para.h           |  2 +-
>  include/linux/hypervisor.h                      | 17 +++++++++++++++--
I'd appreciate if you'd Cc: the maintainers of the touched files...

Reviewed-by: Juergen Gross <jgross at suse.com>


Juergen

Andy Shevchenko

2018-Mar-01 10:28 UTC

head link

[PATCH v3 2/6] PCI: Scan all functions when running over Jailhouse

On Thu, Mar 1, 2018 at 7:40 AM, Jan Kiszka <jan.kiszka at siemens.com>
wrote:> From: Jan Kiszka <jan.kiszka at siemens.com>
>
> Per PCIe r4.0, sec 7.5.1.1.9, multi-function devices are required to
> have a function 0.  Therefore, Linux scans for devices at function 0
> (devfn 0/8/16/...) and only scans for other functions if function 0
> has its Multi-Function Device bit set or ARI or SR-IOV indicate
> there are more functions.
>
> The Jailhouse hypervisor may pass individual functions of a
> multi-function device to a guest without passing function 0, which
> means a Linux guest won't find them.
>
> Change Linux PCI probing so it scans all function numbers when
> running as a guest over Jailhouse.
>
> This is technically prohibited by the spec, so it is possible that
> PCI devices without the Multi-Function Device bit set may have
> unexpected behavior in response to this probe.
>
> Derived from original patch by Benedikt Spranger.
>
FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko at gmail.com>

One nit below.
> CC: Benedikt Spranger <b.spranger at linutronix.de>
> Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
> Acked-by: Bjorn Helgaas <bhelgaas at google.com>
> ---
>  arch/x86/pci/legacy.c |  4 +++-
>  drivers/pci/probe.c   | 22 +++++++++++++++++++---
>  2 files changed, 22 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
> index 1cb01abcb1be..dfbe6ac38830 100644
> --- a/arch/x86/pci/legacy.c
> +++ b/arch/x86/pci/legacy.c
> @@ -4,6 +4,7 @@
>  #include <linux/init.h>
>  #include <linux/export.h>
>  #include <linux/pci.h>
> +#include <asm/jailhouse_para.h>
>  #include <asm/pci_x86.h>
>
>  /*
> @@ -34,13 +35,14 @@ int __init pci_legacy_init(void)
>
>  void pcibios_scan_specific_bus(int busn)
>  {
> +       int stride = jailhouse_paravirt() ? 1 : 8;
>         int devfn;
>         u32 l;
>
>         if (pci_find_bus(0, busn))
>                 return;
>
> -       for (devfn = 0; devfn < 256; devfn += 8) {
> +       for (devfn = 0; devfn < 256; devfn += stride) {
>                 if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l)
&&
>                     l != 0x0000 && l != 0xffff) {
>                         DBG("Found device at %02x:%02x [%04x]\n",
busn, devfn, l);
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index ef5377438a1e..da22d6d216f8 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -16,6 +16,7 @@
>  #include <linux/pci-aspm.h>
>  #include <linux/aer.h>
>  #include <linux/acpi.h>
> +#include <linux/hypervisor.h>
>  #include <linux/irqdomain.h>
>  #include <linux/pm_runtime.h>
>  #include "pci.h"
> @@ -2518,14 +2519,29 @@ static unsigned int
pci_scan_child_bus_extend(struct pci_bus *bus,
>  {
>         unsigned int used_buses, normal_bridges = 0, hotplug_bridges = 0;
>         unsigned int start = bus->busn_res.start;
> -       unsigned int devfn, cmax, max = start;
> +       unsigned int devfn, fn, cmax, max = start;
>         struct pci_dev *dev;
> +       int nr_devs;
>
>         dev_dbg(&bus->dev, "scanning bus\n");
>
>         /* Go find them, Rover! */
> -       for (devfn = 0; devfn < 0x100; devfn += 8)
> -               pci_scan_slot(bus, devfn);
> +       for (devfn = 0; devfn < 0x100; devfn += 8) {
Since you touch this line perhaps make sense to unify with above, i.e.
0x100 -> 256 ?
> +               nr_devs = pci_scan_slot(bus, devfn);
> +
> +               /*
> +                * The Jailhouse hypervisor may pass individual functions
of a
> +                * multi-function device to a guest without passing
function 0.
> +                * Look for them as well.
> +                */
> +               if (jailhouse_paravirt() && nr_devs == 0) {
> +                       for (fn = 1; fn < 8; fn++) {
> +                               dev = pci_scan_single_device(bus, devfn +
fn);
> +                               if (dev)
> +                                       dev->multifunction = 1;
> +                       }
> +               }
> +       }
>
>         /* Reserve buses for SR-IOV capability */
>         used_buses = pci_iov_bus_range(bus);
> --
> 2.13.6
>


-- 
With Best Regards,
Andy Shevchenko

Andy Shevchenko

2018-Mar-01 10:31 UTC

head link

[PATCH v3 3/6] x86/jailhouse: Enable PCI mmconfig access in inmates

On Thu, Mar 1, 2018 at 7:40 AM, Jan Kiszka <jan.kiszka at siemens.com>
wrote:
> Use the PCI mmconfig base address exported by jailhouse in boot
> parameters in order to access the memory mapped PCI configuration space.
> --- a/arch/x86/kernel/jailhouse.c
> +++ b/arch/x86/kernel/jailhouse.c
> @@ -124,6 +124,13 @@ static int __init jailhouse_pci_arch_init(void)
>         if (pcibios_last_bus < 0)
>                 pcibios_last_bus = 0xff;
>
> +#ifdef CONFIG_PCI_MMCONFIG
> +       if (setup_data.pci_mmconfig_base) {
> +               pci_mmconfig_add(0, 0, 0xff, setup_data.pci_mmconfig_base);
Hmm... Shouldn't be pcibios_last_bus instead of 0xff?
> +               pci_mmcfg_arch_init();
> +       }
> +#endif
-- 
With Best Regards,
Andy Shevchenko

Andy Shevchenko

2018-Mar-01 10:31 UTC

head link

[PATCH v3 4/6] x86: Consolidate PCI_MMCONFIG configs

On Thu, Mar 1, 2018 at 7:40 AM, Jan Kiszka <jan.kiszka at siemens.com>
wrote:> From: Jan Kiszka <jan.kiszka at siemens.com>
>
> Since e279b6c1d329 ("x86: start unification of
arch/x86/Kconfig.*"), we
> have two PCI_MMCONFIG entries, one from the original i386 and another
> from x86_64. This consolidates both entries into a single one.
>
> The logic for x86_32, where this option was not under user control,
> remains identical. On x86_64, PCI_MMCONFIG becomes additionally
> configurable for SFI systems even if ACPI was disabled. This just
> simplifies the logic without restricting the configurability in any way.
>
FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko at gmail.com>
> Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
> ---
>  arch/x86/Kconfig | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index eb7f43f23521..aef9d67ac186 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2641,8 +2641,9 @@ config PCI_DIRECT
>         depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY ||
PCI_GOOLPC || PCI_GOMMCONFIG))
>
>  config PCI_MMCONFIG
> -       def_bool y
> -       depends on X86_32 && PCI && (ACPI || SFI)
&& (PCI_GOMMCONFIG || PCI_GOANY)
> +       bool "Support mmconfig PCI config space access" if X86_64
> +       default y
> +       depends on PCI && (ACPI || SFI) && (X86_64 ||
(PCI_GOANY || PCI_GOMMCONFIG))
>
>  config PCI_OLPC
>         def_bool y
> @@ -2657,10 +2658,6 @@ config PCI_DOMAINS
>         def_bool y
>         depends on PCI
>
> -config PCI_MMCONFIG
> -       bool "Support mmconfig PCI config space access"
> -       depends on X86_64 && PCI && ACPI
> -
>  config PCI_CNB20LE_QUIRK
>         bool "Read CNB20LE Host Bridge Windows" if EXPERT
>         depends on PCI
> --
> 2.13.6
>


-- 
With Best Regards,
Andy Shevchenko

Andy Shevchenko

2018-Mar-01 16:35 UTC

head link

[PATCH v3 4/6] x86: Consolidate PCI_MMCONFIG configs

On Thu, Mar 1, 2018 at 5:13 PM, Bjorn Helgaas <helgaas at kernel.org>
wrote:> On Thu, Mar 01, 2018 at 06:40:47AM +0100, Jan Kiszka wrote:
>> From: Jan Kiszka <jan.kiszka at siemens.com>
>>
>> Since e279b6c1d329 ("x86: start unification of
arch/x86/Kconfig.*"), we
>> have two PCI_MMCONFIG entries, one from the original i386 and another
>> from x86_64. This consolidates both entries into a single one.
>>
>> The logic for x86_32, where this option was not under user control,
>> remains identical. On x86_64, PCI_MMCONFIG becomes additionally
>> configurable for SFI systems even if ACPI was disabled. This just
>> simplifies the logic without restricting the configurability in any
way.
>
> Thanks for mentioning this difference.  It's probably trivial, but if
> you have any other reason to respin this series, I would split this
> into two patches:
>
>   - allow PCI_MMCONFIG on x86_64 with SFI
>   - consolidate PCI_MMCONFIG with no logical change at all
>
>> Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
>
> But either way,
>
> Acked-by: Bjorn Helgaas <bhelgaas at google.com>
>
If you going to respin I would suggest one more trivia

Split long depends on to two lines, like
-      depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY ||
PCI_GOOLPC || PCI_GOMMCONFIG))
+      depends on PCI
+      depends on X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC
|| PCI_GOMMCONFIG)

...

      depends on PCI && (ACPI || SFI) && (X86_64 || (PCI_GOANY
||
PCI_GOMMCONFIG))
+     depends on PCI && (ACPI || SFI)
+     depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG)

(perhaps in a separate change)
>> ---
>>  arch/x86/Kconfig | 9 +++------
>>  1 file changed, 3 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index eb7f43f23521..aef9d67ac186 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -2641,8 +2641,9 @@ config PCI_DIRECT
>>       depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY
|| PCI_GOOLPC || PCI_GOMMCONFIG))
>>
>>  config PCI_MMCONFIG
>> -     def_bool y
>> -     depends on X86_32 && PCI && (ACPI || SFI)
&& (PCI_GOMMCONFIG || PCI_GOANY)
>> +     bool "Support mmconfig PCI config space access" if
X86_64
>> +     default y
>> +     depends on PCI && (ACPI || SFI) && (X86_64 ||
(PCI_GOANY || PCI_GOMMCONFIG))
>>
>>  config PCI_OLPC
>>       def_bool y
>> @@ -2657,10 +2658,6 @@ config PCI_DOMAINS
>>       def_bool y
>>       depends on PCI
>>
>> -config PCI_MMCONFIG
>> -     bool "Support mmconfig PCI config space access"
>> -     depends on X86_64 && PCI && ACPI
>> -
>>  config PCI_CNB20LE_QUIRK
>>       bool "Read CNB20LE Host Bridge Windows" if EXPERT
>>       depends on PCI
>> --
>> 2.13.6
>>


-- 
With Best Regards,
Andy Shevchenko

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