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charset="utf-8" From: Edward Pickup This patch adds a Xen boot arguments that, if enabled, causes a call to existing code to scan pci devices enumerated by the firmware. This will be needed ahead of dom0less support for pci passthrough on arm. Signed-off-by: Luca Fancellu Signed-off-by: Stewart Hildebrand Signed-off-by: Mykyta Poturai --- (cherry picked from commit bce463e1588a45e1bfdf59fc0d5f88b16604e439 from the downstream branch poc/pci-passthrough from https://gitlab.com/xen-project/people/bmarquis/xen-arm-poc.git) v1->v2: * remove is_pci_scan_enabled wrapper * make pci_scan_enabled ro_after_init * drop debug prints * drop Edward's SOB changes since cherry-pick: * s/always_inline/inline/ * replace additional kconfig option with config DEBUG --- docs/misc/xen-command-line.pandoc | 7 +++++++ xen/arch/arm/include/asm/pci.h | 3 +++ xen/arch/arm/pci/pci-host-common.c | 1 + xen/arch/arm/pci/pci.c | 24 ++++++++++++++++++++++-- 4 files changed, 33 insertions(+), 2 deletions(-) diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line= .pandoc index 518e42d965..4a66c5a8f9 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -2072,6 +2072,13 @@ This option can be specified more than once (up to 8= times at present). =20 Flag to enable or disable support for PCI passthrough =20 +### pci-scan (arm) +> `=3D ` + +> Default: `false` + +Flag to enable or disable Xen PCI scan at boot. + ### pcid (x86) > `=3D | xpti=3D` =20 diff --git a/xen/arch/arm/include/asm/pci.h b/xen/arch/arm/include/asm/pci.h index 08ffcd4438..7289f7688b 100644 --- a/xen/arch/arm/include/asm/pci.h +++ b/xen/arch/arm/include/asm/pci.h @@ -23,6 +23,7 @@ #define pci_to_dev(pcidev) (&(pcidev)->arch.dev) =20 extern bool pci_passthrough_enabled; +extern bool pci_scan_enabled; =20 struct rangeset; =20 @@ -155,6 +156,8 @@ bool arch_pci_device_physdevop(void); =20 #else /*!CONFIG_HAS_PCI*/ =20 +#define pci_scan_enabled false + struct pci_dev; =20 static inline void arch_pci_init_pdev(struct pci_dev *pdev) {} diff --git a/xen/arch/arm/pci/pci-host-common.c b/xen/arch/arm/pci/pci-host= -common.c index 487c545f3a..d3481b05eb 100644 --- a/xen/arch/arm/pci/pci-host-common.c +++ b/xen/arch/arm/pci/pci-host-common.c @@ -284,6 +284,7 @@ pci_host_common_probe(struct dt_device_node *dev, } =20 pci_add_host_bridge(bridge); + pci_add_segment(bridge->segment); =20 return bridge; =20 diff --git a/xen/arch/arm/pci/pci.c b/xen/arch/arm/pci/pci.c index beb1f971fa..1b34e17517 100644 --- a/xen/arch/arm/pci/pci.c +++ b/xen/arch/arm/pci/pci.c @@ -91,8 +91,14 @@ bool arch_pci_device_physdevop(void) bool __read_mostly pci_passthrough_enabled; boolean_param("pci-passthrough", pci_passthrough_enabled); =20 +/* By default pci scan is disabled. */ +bool __ro_after_init pci_scan_enabled; +boolean_param("pci-scan", pci_scan_enabled); + static int __init pci_init(void) { + int ret; + /* * Enable PCI passthrough when has been enabled explicitly * (pci-passthrough=3Don). @@ -104,9 +110,23 @@ static int __init pci_init(void) panic("Could not initialize PCI segment 0\n"); =20 if ( acpi_disabled ) - return dt_pci_init(); + ret =3D dt_pci_init(); else - return acpi_pci_init(); + ret =3D acpi_pci_init(); + + if ( ret < 0 ) + return ret; + + if ( pci_scan_enabled ) + { + ret =3D scan_pci_devices(); + + if ( ret < 0 ) + return ret; + + } + + return 0; } __initcall(pci_init); =20 --=20 2.34.1 From nobody Sat Oct 4 22:05:32 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; 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charset="utf-8" From: Stewart Hildebrand PCI ranges have prefetchable / non-prefetchable flags that will be needed in the callback. Pass the flags to the callback. Signed-off-by: Stewart Hildebrand Signed-off-by: Mykyta Poturai --- xen/arch/arm/device.c | 4 ++-- xen/arch/arm/domain_build.c | 3 ++- xen/arch/arm/include/asm/setup.h | 2 +- xen/arch/arm/pci/pci-host-common.c | 4 ++-- xen/common/device-tree/device-tree.c | 5 +++-- xen/include/xen/device_tree.h | 2 +- 6 files changed, 11 insertions(+), 9 deletions(-) diff --git a/xen/arch/arm/device.c b/xen/arch/arm/device.c index 74b54cad34..cc0759023e 100644 --- a/xen/arch/arm/device.c +++ b/xen/arch/arm/device.c @@ -50,7 +50,7 @@ int map_irq_to_domain(struct domain *d, unsigned int irq, } =20 int map_range_to_domain(const struct dt_device_node *dev, - uint64_t addr, uint64_t len, void *data) + uint32_t flags, uint64_t addr, uint64_t len, void = *data) { struct map_range_data *mr_data =3D data; struct domain *d =3D mr_data->d; @@ -325,7 +325,7 @@ int handle_device(struct domain *d, struct dt_device_no= de *dev, p2m_type_t p2mt, return res; } =20 - res =3D map_range_to_domain(dev, addr, size, &mr_data); + res =3D map_range_to_domain(dev, 0, addr, size, &mr_data); if ( res ) return res; } diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index fb8fbb1650..4bbffdf535 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -762,7 +762,8 @@ int __init add_ext_regions(unsigned long s_gfn, unsigne= d long e_gfn, } =20 static int __init handle_pci_range(const struct dt_device_node *dev, - uint64_t addr, uint64_t len, void *data) + uint32_t flags, uint64_t addr, uint64_t= len, + void *data) { struct rangeset *mem_holes =3D data; paddr_t start, end; diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/se= tup.h index 1eaf13bd66..97bc5f90a1 100644 --- a/xen/arch/arm/include/asm/setup.h +++ b/xen/arch/arm/include/asm/setup.h @@ -62,7 +62,7 @@ int map_device_irqs_to_domain(struct domain *d, struct dt= _device_node *dev, int map_irq_to_domain(struct domain *d, unsigned int irq, bool need_mapping, const char *devname); =20 -int map_range_to_domain(const struct dt_device_node *dev, +int map_range_to_domain(const struct dt_device_node *dev, uint32_t flags, uint64_t addr, uint64_t len, void *data); =20 struct init_info diff --git a/xen/arch/arm/pci/pci-host-common.c b/xen/arch/arm/pci/pci-host= -common.c index d3481b05eb..67447d8696 100644 --- a/xen/arch/arm/pci/pci-host-common.c +++ b/xen/arch/arm/pci/pci-host-common.c @@ -418,7 +418,7 @@ int __init pci_host_bridge_mappings(struct domain *d) bridge->child_ops->need_p2m_hwdom_mapping(d, bridge, a= ddr); if ( need_mapping ) { - err =3D map_range_to_domain(dev, addr, size, &mr_data); + err =3D map_range_to_domain(dev, 0, addr, size, &mr_data); if ( err ) return err; } @@ -434,7 +434,7 @@ int __init pci_host_bridge_mappings(struct domain *d) * right place for alignment check. */ static int is_bar_valid(const struct dt_device_node *dev, - uint64_t addr, uint64_t len, void *data) + uint32_t flags, uint64_t addr, uint64_t len, void = *data) { struct pdev_bar_check *bar_data =3D data; paddr_t s =3D bar_data->start; diff --git a/xen/common/device-tree/device-tree.c b/xen/common/device-tree/= device-tree.c index 0b5375f151..5ee1fa4eb1 100644 --- a/xen/common/device-tree/device-tree.c +++ b/xen/common/device-tree/device-tree.c @@ -976,7 +976,7 @@ int dt_device_get_paddr(const struct dt_device_node *de= v, unsigned int index, =20 int dt_for_each_range(const struct dt_device_node *dev, int (*cb)(const struct dt_device_node *dev, - uint64_t addr, uint64_t length, + uint32_t flags, uint64_t addr, uint64_t le= ngth, void *data), void *data) { @@ -1041,13 +1041,14 @@ int dt_for_each_range(const struct dt_device_node *= dev, { uint64_t a, s; int ret; + uint32_t flags =3D bus->get_flags(ranges); =20 memcpy(addr, ranges + na, 4 * pna); =20 a =3D __dt_translate_address(dev, addr, "ranges"); s =3D dt_read_number(ranges + na + pna, ns); =20 - ret =3D cb(dev, a, s, data); + ret =3D cb(dev, flags, a, s, data); if ( ret ) { dt_dprintk(" -> callback failed=3D%d\n", ret); diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h index 06d7643622..1091e34a10 100644 --- a/xen/include/xen/device_tree.h +++ b/xen/include/xen/device_tree.h @@ -667,7 +667,7 @@ int dt_for_each_irq_map(const struct dt_device_node *de= v, */ int dt_for_each_range(const struct dt_device_node *dev, int (*cb)(const struct dt_device_node *dev, - uint64_t addr, uint64_t length, + uint32_t flags, uint64_t addr, uint64_t le= ngth, void *data), void *data); =20 --=20 2.34.1 From nobody Sat Oct 4 22:05:32 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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charset="utf-8" From: Luca Fancellu When pci-scan is enabled and Xen supports vpci for guests, Xen will scan the pci bus to find devices and emulate the pci bus, so the hw domain must see the emulated bus instead of the real one. A new helper function, hwdom_uses_vpci, is implemented and returns true when pci-scan is enabled and Xen is built with CONFIG_HAS_VPCI_GUEST_SUPPORT=3Dy. When hwdom_uses_vpci() is true, a vpci node is created for the hwdom device tree. Depending on whether the guest is using vPCI or not, and whether the domain is using host layout or not, generate the appropriate device tree nodes for the guest and handle the right MMIO regions traps. Signed-off-by: Luca Fancellu Signed-off-by: Stewart Hildebrand Signed-off-by: Mykyta Poturai --- docs/misc/xen-command-line.pandoc | 4 +- xen/arch/arm/domain_build.c | 151 +++++++++++++++++++++++- xen/arch/arm/include/asm/domain_build.h | 1 + xen/arch/arm/include/asm/pci.h | 15 +++ xen/arch/x86/include/asm/pci.h | 6 + 5 files changed, 175 insertions(+), 2 deletions(-) diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line= .pandoc index 4a66c5a8f9..ac8e7bfb7a 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -2077,7 +2077,9 @@ Flag to enable or disable support for PCI passthrough =20 > Default: `false` =20 -Flag to enable or disable Xen PCI scan at boot. +Flag to enable or disable Xen PCI scan at boot. When the flag is enabled, = the +hardware domain cannot have access to the real PCI bus, it will see the bus +emulated by Xen. =20 ### pcid (x86) > `=3D | xpti=3D` diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 4bbffdf535..f49e0e6486 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -41,6 +41,7 @@ #include #include #include +#include =20 static unsigned int __initdata opt_dom0_max_vcpus; integer_param("dom0_max_vcpus", opt_dom0_max_vcpus); @@ -1557,6 +1558,142 @@ int __init make_chosen_node(const struct kernel_inf= o *kinfo) return res; } =20 +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT +struct vpci_param { + uint64_t vpci_ecam_base; + uint64_t vpci_ecam_size; + uint64_t vpci_mem_base; + uint64_t vpci_mem_size; + uint64_t vpci_mem_prefetch_base; + uint64_t vpci_mem_prefetch_size; +}; + +static int __init handle_vpci_range(const struct dt_device_node *dev, + uint32_t flags, uint64_t addr, uint64_= t len, + void *data) +{ + struct vpci_param *vpci =3D (struct vpci_param *)data; + + if ( !(flags & IORESOURCE_MEM) ) + return 0; + + if ( !(flags & IORESOURCE_PREFETCH) && addr < GB(4) ) + { + vpci->vpci_mem_base =3D addr; + vpci->vpci_mem_size =3D len; + } + else if ( flags & IORESOURCE_PREFETCH ) + { + vpci->vpci_mem_prefetch_base =3D addr; + vpci->vpci_mem_prefetch_size =3D len; + } + return 0; +} + +int __init make_vpci_node(struct domain *d, void *fdt) +{ + /* reg is sized to be used for all the needed properties below */ + __be32 reg[((GUEST_ROOT_ADDRESS_CELLS * 2) + GUEST_ROOT_SIZE_CELLS + 1) + * 2]; + __be32 *cells; + char buf[22]; /* pcie@ + max 16 char address + '\0' */ + int res; + struct vpci_param vpci =3D { + .vpci_ecam_base =3D GUEST_VPCI_ECAM_BASE, + .vpci_ecam_size =3D GUEST_VPCI_ECAM_SIZE, + .vpci_mem_base =3D GUEST_VPCI_MEM_ADDR, + .vpci_mem_size =3D GUEST_VPCI_MEM_SIZE, + .vpci_mem_prefetch_base =3D GUEST_VPCI_PREFETCH_MEM_ADDR, + .vpci_mem_prefetch_size =3D GUEST_VPCI_PREFETCH_MEM_SIZE + }; + + if ( domain_use_host_layout(d) ) + { + struct pci_host_bridge *bridge; + + bridge =3D pci_find_host_bridge(0, 0); + + vpci.vpci_ecam_base =3D bridge->cfg->phys_addr; + vpci.vpci_ecam_size =3D bridge->cfg->size; + + res =3D dt_for_each_range(bridge->dt_node, handle_vpci_range, &vpc= i); + if ( res < 0 ) + return -EINVAL; + } + + snprintf(buf, sizeof(buf), "pcie@%"PRIx64, vpci.vpci_ecam_base); + dt_dprintk("Create vpci node\n"); + res =3D fdt_begin_node(fdt, buf); + if ( res ) + return res; + + res =3D fdt_property_string(fdt, "compatible", "pci-host-ecam-generic"= ); + if ( res ) + return res; + + res =3D fdt_property_string(fdt, "device_type", "pci"); + if ( res ) + return res; + + /* Create reg property */ + cells =3D ®[0]; + dt_child_set_range(&cells, GUEST_ROOT_ADDRESS_CELLS, GUEST_ROOT_SIZE_C= ELLS, + vpci.vpci_ecam_base, vpci.vpci_ecam_size); + + res =3D fdt_property(fdt, "reg", reg, + (GUEST_ROOT_ADDRESS_CELLS + + GUEST_ROOT_SIZE_CELLS) * sizeof(*reg)); + if ( res ) + return res; + + /* Create bus-range property */ + cells =3D ®[0]; + dt_set_cell(&cells, 1, 0); + dt_set_cell(&cells, 1, 255); + res =3D fdt_property(fdt, "bus-range", reg, 2 * sizeof(*reg)); + if ( res ) + return res; + + res =3D fdt_property_cell(fdt, "#address-cells", 3); + if ( res ) + return res; + + res =3D fdt_property_cell(fdt, "#size-cells", 2); + if ( res ) + return res; + + res =3D fdt_property_string(fdt, "status", "okay"); + if ( res ) + return res; + + /* + * Create ranges property as: + * <(PCI bitfield) (PCI address) (CPU address) (Size)> + */ + cells =3D ®[0]; + dt_set_cell(&cells, 1, GUEST_VPCI_ADDR_TYPE_MEM); + dt_set_cell(&cells, GUEST_ROOT_ADDRESS_CELLS, vpci.vpci_mem_base); + dt_set_cell(&cells, GUEST_ROOT_ADDRESS_CELLS, vpci.vpci_mem_base); + dt_set_cell(&cells, GUEST_ROOT_SIZE_CELLS, vpci.vpci_mem_size); + dt_set_cell(&cells, 1, GUEST_VPCI_ADDR_TYPE_PREFETCH_MEM); + dt_set_cell(&cells, GUEST_ROOT_ADDRESS_CELLS, vpci.vpci_mem_prefetch_b= ase); + dt_set_cell(&cells, GUEST_ROOT_ADDRESS_CELLS, vpci.vpci_mem_prefetch_b= ase); + dt_set_cell(&cells, GUEST_ROOT_SIZE_CELLS, vpci.vpci_mem_prefetch_size= ); + res =3D fdt_property(fdt, "ranges", reg, sizeof(reg)); + if ( res ) + return res; + + res =3D fdt_end_node(fdt); + + return res; +} +#else +static inline int __init make_vpci_node(struct domain *d, void *fdt) +{ + return 0; +} +#endif + static int __init handle_node(struct domain *d, struct kernel_info *kinfo, struct dt_device_node *node, p2m_type_t p2mt) @@ -1615,7 +1752,12 @@ static int __init handle_node(struct domain *d, stru= ct kernel_info *kinfo, dt_dprintk(" Skip it (blacklisted)\n"); return 0; } - + /* If Xen is scanning the PCI devices, don't expose real bus to hwdom = */ + if ( hwdom_uses_vpci() && dt_device_type_is_equal(node, "pci") ) + { + dt_dprintk(" Skip it (pci-scan is enabled)\n"); + return 0; + } /* * Replace these nodes with our own. Note that the original may be * used_by DOMID_XEN so this check comes first. @@ -1766,6 +1908,13 @@ static int __init handle_node(struct domain *d, stru= ct kernel_info *kinfo, if ( res ) return res; } + + if ( hwdom_uses_vpci() ) + { + res =3D make_vpci_node(d, kinfo->fdt); + if ( res ) + return res; + } } =20 res =3D fdt_end_node(kinfo->fdt); diff --git a/xen/arch/arm/include/asm/domain_build.h b/xen/arch/arm/include= /asm/domain_build.h index c6fec3168c..bb36e0150b 100644 --- a/xen/arch/arm/include/asm/domain_build.h +++ b/xen/arch/arm/include/asm/domain_build.h @@ -6,6 +6,7 @@ =20 typedef __be32 gic_interrupt_t[3]; int make_psci_node(void *fdt); +int make_vpci_node(struct domain *d, void *fdt); void evtchn_allocate(struct domain *d); =20 /* diff --git a/xen/arch/arm/include/asm/pci.h b/xen/arch/arm/include/asm/pci.h index 7289f7688b..4fc46da315 100644 --- a/xen/arch/arm/include/asm/pci.h +++ b/xen/arch/arm/include/asm/pci.h @@ -176,4 +176,19 @@ static inline int pci_get_new_domain_nr(void) } =20 #endif /*!CONFIG_HAS_PCI*/ + +#ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT +static inline bool hwdom_uses_vpci(void) +{ + return pci_scan_enabled; +} + +#else /*!CONFIG_HAS_VPCI_GUEST_SUPPORT*/ + +static inline bool hwdom_uses_vpci(void) +{ + return false; +} +#endif /*!CONFIG_HAS_VPCI_GUEST_SUPPORT*/ + #endif /* __ARM_PCI_H__ */ diff --git a/xen/arch/x86/include/asm/pci.h b/xen/arch/x86/include/asm/pci.h index 0b98081aea..08e8959d0d 100644 --- a/xen/arch/x86/include/asm/pci.h +++ b/xen/arch/x86/include/asm/pci.h @@ -76,4 +76,10 @@ int pci_sanitize_bar_memory(struct rangeset *r); =20 void pci_setup(void); =20 +/* Unlike ARM, HW domain does not ever use vpci for x86 */ +static inline bool hwdom_uses_vpci(void) +{ + return false; +} + #endif /* __X86_PCI_H__ */ --=20 2.34.1 From nobody Sat Oct 4 22:05:32 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; 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charset="utf-8" From: Luca Fancellu On ARM, if the hardware domain is using the emulated bus, it should not be allowed to add/remove pci devices, so return EOPNOTSUPP in that case. Signed-off-by: Luca Fancellu Signed-off-by: Stewart Hildebrand Signed-off-by: Mykyta Poturai --- xen/drivers/pci/physdev.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/xen/drivers/pci/physdev.c b/xen/drivers/pci/physdev.c index d46501b884..5b3f8dde14 100644 --- a/xen/drivers/pci/physdev.c +++ b/xen/drivers/pci/physdev.c @@ -19,6 +19,9 @@ ret_t pci_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void= ) arg) struct pci_dev_info pdev_info; nodeid_t node =3D NUMA_NO_NODE; =20 + if ( hwdom_uses_vpci() ) + return -EOPNOTSUPP; + if ( !is_pci_passthrough_enabled() && !arch_pci_device_physdevop()= ) return -EOPNOTSUPP; =20 @@ -57,6 +60,9 @@ ret_t pci_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void= ) arg) case PHYSDEVOP_pci_device_remove: { struct physdev_pci_device dev; =20 + if ( hwdom_uses_vpci() ) + return -EOPNOTSUPP; + if ( !is_pci_passthrough_enabled() && !arch_pci_device_physdevop()= ) return -EOPNOTSUPP; =20 --=20 2.34.1 From nobody Sat Oct 4 22:05:32 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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charset="utf-8" From: Stefano Stabellini has_vpci_bridge is a macro to check if the domain is a domU or is dom0 with vPCI (pci-scan=3Dyes) enabled. Use the macro in drivers/vpci. Signed-off-by: Stefano Stabellini Signed-off-by: Stewart Hildebrand Signed-off-by: Mykyta Poturai --- xen/drivers/vpci/header.c | 14 +++++++------- xen/drivers/vpci/vpci.c | 4 ++-- xen/include/xen/vpci.h | 9 +++++++++ 3 files changed, 18 insertions(+), 9 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index 469f497744..903168ff96 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -230,7 +230,7 @@ bool vpci_process_pending(struct vcpu *v) =20 read_unlock(&v->domain->pci_lock); =20 - if ( !is_hardware_domain(v->domain) ) + if ( has_vpci_bridge(v->domain) ) domain_crash(v->domain); =20 return false; @@ -492,7 +492,7 @@ static int modify_bars(const struct pci_dev *pdev, uint= 16_t cmd, bool rom_only) } } =20 - if ( !is_hardware_domain(d) ) + if ( has_vpci_bridge(d) ) break; =20 d =3D dom_xen; @@ -522,7 +522,7 @@ static void cf_check cmd_write( { struct vpci_header *header =3D data; =20 - if ( !is_hardware_domain(pdev->domain) ) + if ( has_vpci_bridge(pdev->domain) ) { const struct vpci *vpci =3D pdev->vpci; =20 @@ -564,7 +564,7 @@ static void cf_check bar_write( struct vpci_bar *bar =3D data; bool hi =3D false; =20 - ASSERT(is_hardware_domain(pdev->domain)); + ASSERT(!has_vpci_bridge(pdev->domain)); =20 if ( bar->type =3D=3D VPCI_BAR_MEM64_HI ) { @@ -747,7 +747,7 @@ static int vpci_init_capability_list(struct pci_dev *pd= ev) { int rc; bool mask_cap_list =3D false; - bool is_hwdom =3D is_hardware_domain(pdev->domain); + bool is_hwdom =3D !has_vpci_bridge(pdev->domain); =20 if ( pci_conf_read16(pdev->sbdf, PCI_STATUS) & PCI_STATUS_CAP_LIST ) { @@ -829,7 +829,7 @@ static int vpci_init_ext_capability_list(const struct p= ci_dev *pdev) { unsigned int pos =3D PCI_CFG_SPACE_SIZE; =20 - if ( !is_hardware_domain(pdev->domain) ) + if ( has_vpci_bridge(pdev->domain) ) /* Extended capabilities read as zero, write ignore for DomU */ return vpci_add_register(pdev->vpci, vpci_read_val, NULL, pos, 4, (void *)0); @@ -866,7 +866,7 @@ int vpci_init_header(struct pci_dev *pdev) struct vpci_header *header =3D &pdev->vpci->header; struct vpci_bar *bars =3D header->bars; int rc; - bool is_hwdom =3D is_hardware_domain(pdev->domain); + bool is_hwdom =3D !has_vpci_bridge(pdev->domain); =20 ASSERT(rw_is_write_locked(&pdev->domain->pci_lock)); =20 diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index 07c7071d0a..8ea89b9805 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -48,7 +48,7 @@ static int assign_virtual_sbdf(struct pci_dev *pdev) =20 ASSERT(rw_is_write_locked(&pdev->domain->pci_lock)); =20 - if ( is_hardware_domain(d) ) + if ( !has_vpci_bridge(d) ) return 0; =20 /* @@ -429,7 +429,7 @@ static const struct pci_dev *translate_virtual_device(c= onst struct domain *d, #ifdef CONFIG_HAS_VPCI_GUEST_SUPPORT const struct pci_dev *pdev; =20 - ASSERT(!is_hardware_domain(d)); + ASSERT(has_vpci_bridge(d)); ASSERT(rw_is_locked(&d->pci_lock)); =20 for_each_pdev ( d, pdev ) diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h index 9ae75d946a..e0aecfac72 100644 --- a/xen/include/xen/vpci.h +++ b/xen/include/xen/vpci.h @@ -339,6 +339,15 @@ static inline int __must_check vpci_reset_device(struc= t pci_dev *pdev) return vpci_assign_device(pdev); 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b=IQ3hyCZi9tQHBFAjl0Zgq1BLGMCA4w5Fc+qBs3/0K+Q220UXS4iTN3KqP51eiGkcpe9Fu3d48OZDzT9jWxgyVbYi4Wdic4AKNgUvjKEfb3bVg2w4u5dfHjR/5VKGsJp4CimFfJk7msQreSazDqThr7U6SJPWykEtKhG9TdfqBQ4JDEt51LhujXpoDGqH0PAuj3apuiSN4iJHHa3XZU0+WSV0OS9j2wpMt/VeRO+DLwDzQP0Xs+y8RsyXPtntMo/cw6R/DuntmR6AM2dDOyImrMnQ3CumKSSlzrBJtQIecY1az/GGcorutvoo6tF9uDlqPE+G/4OuocqS2bJ9qEWVPw== From: Mykyta Poturai To: "xen-devel@lists.xenproject.org" CC: Stewart Hildebrand , Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel , Volodymyr Babchuk , Andrew Cooper , Anthony PERARD , Jan Beulich , =?iso-8859-1?Q?Roger_Pau_Monn=E9?= , Mykyta Poturai Subject: [PATCH v1 6/8] xen/pci: initialize BARs Thread-Topic: [PATCH v1 6/8] xen/pci: initialize BARs Thread-Index: AQHcLSkjNTjer4+LIk6OKFhehALrog== Date: Wed, 24 Sep 2025 07:59:23 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=epam.com; 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charset="utf-8" From: Stewart Hildebrand A PCI device must have valid BARs in order to assign it to a domain. On ARM, firmware is unlikely to have initialized the BARs, so we must do this in Xen. During setup_hwdom_pci_devices(), check if each BAR is valid. If the BAR happens to already be valid, remove the BAR range from a rangeset of valid PCI ranges so as to avoid overlap when reserving a new BAR. If not valid, reserve a new BAR address from the rangeset and write it to the device. Avaliable ranges are read from DT during init and stored in distinct rangesets. Signed-off-by: Stewart Hildebrand Signed-off-by: Mykyta Poturai --- xen/arch/arm/include/asm/pci.h | 7 +++ xen/arch/arm/pci/pci-host-common.c | 78 +++++++++++++++++++++++++++++ xen/arch/x86/include/asm/pci.h | 14 ++++++ xen/common/rangeset.c | 35 +++++++++++++ xen/drivers/passthrough/pci.c | 79 ++++++++++++++++++++++++++++++ xen/include/xen/rangeset.h | 6 ++- 6 files changed, 218 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/include/asm/pci.h b/xen/arch/arm/include/asm/pci.h index 4fc46da315..ba4caa56ae 100644 --- a/xen/arch/arm/include/asm/pci.h +++ b/xen/arch/arm/include/asm/pci.h @@ -74,6 +74,8 @@ struct pci_host_bridge { struct pci_config_window *child_cfg; const struct pci_ops *child_ops; void *priv; /* Private data of the bridge. */ + struct rangeset *bar_ranges; + struct rangeset *bar_ranges_prefetch; }; =20 struct pci_ops { @@ -154,6 +156,11 @@ void pci_generic_init_bus_range_child(struct dt_device= _node *dev, =20 bool arch_pci_device_physdevop(void); =20 +uint64_t pci_get_new_bar_addr(const struct pci_dev *pdev, uint64_t size, + bool is_64bit, bool prefetch); +int pci_reserve_bar_range(const struct pci_dev *pdev, uint64_t addr, + uint64_t size, bool prefetch); + #else /*!CONFIG_HAS_PCI*/ =20 #define pci_scan_enabled false diff --git a/xen/arch/arm/pci/pci-host-common.c b/xen/arch/arm/pci/pci-host= -common.c index 67447d8696..bfe610a403 100644 --- a/xen/arch/arm/pci/pci-host-common.c +++ b/xen/arch/arm/pci/pci-host-common.c @@ -21,6 +21,7 @@ #include #include #include +#include =20 #include =20 @@ -232,6 +233,21 @@ static int pci_bus_find_domain_nr(struct dt_device_nod= e *dev) return domain; } =20 +static int add_bar_range(const struct dt_device_node *dev, uint32_t flags, + uint64_t addr, uint64_t len, void *data) +{ + struct pci_host_bridge *bridge =3D data; + + if ( !(flags & IORESOURCE_MEM) ) + return 0; + + if ( flags & IORESOURCE_PREFETCH ) + return rangeset_add_range(bridge->bar_ranges_prefetch, addr, + addr + len - 1); + else + return rangeset_add_range(bridge->bar_ranges, addr, addr + len - 1= ); +} + struct pci_host_bridge * pci_host_common_probe(struct dt_device_node *dev, const struct pci_ecam_ops *ops, @@ -286,6 +302,14 @@ pci_host_common_probe(struct dt_device_node *dev, pci_add_host_bridge(bridge); pci_add_segment(bridge->segment); =20 + bridge->bar_ranges =3D rangeset_new(NULL, "BAR ranges", + RANGESETF_prettyprint_hex); + bridge->bar_ranges_prefetch =3D rangeset_new(NULL, + "BAR ranges (prefetchable)", + RANGESETF_prettyprint_hex); + if ( bridge->bar_ranges && bridge->bar_ranges_prefetch ) + dt_for_each_range(bridge->dt_node, add_bar_range, bridge); + return bridge; =20 err_child: @@ -476,6 +500,60 @@ bool pci_check_bar(const struct pci_dev *pdev, mfn_t s= tart, mfn_t end) =20 return bar_data.is_valid; } + +uint64_t pci_get_new_bar_addr(const struct pci_dev *pdev, uint64_t size, + bool is_64bit, bool prefetch) +{ + struct pci_host_bridge *bridge; + struct rangeset *range; + uint64_t addr; + + bridge =3D pci_find_host_bridge(pdev->seg, pdev->bus); + if ( !bridge ) + return 0; + + range =3D prefetch ? bridge->bar_ranges_prefetch : bridge->bar_ranges; + + if ( size < PAGE_SIZE ) + size =3D PAGE_SIZE; + + if ( is_64bit && !rangeset_find_aligned_range(range, size, GB(4), &add= r) ) + { + if ( rangeset_remove_range(range, addr, addr + size - 1) ) + { + printk("%s:%d:%s error\n", __FILE__, __LINE__, __func__); + } + return addr; + } + if ( !rangeset_find_aligned_range(range, size, 0, &addr) ) + { + if ( !is_64bit && addr >=3D GB(4) ) + return 0; + if ( rangeset_remove_range(range, addr, addr + size - 1) ) + { + printk("%s:%d:%s error\n", __FILE__, __LINE__, __func__); + } + return addr; + } + + return 0; +} + +int pci_reserve_bar_range(const struct pci_dev *pdev, uint64_t addr, + uint64_t size, bool prefetch) +{ + struct pci_host_bridge *bridge; + struct rangeset *range; + + bridge =3D pci_find_host_bridge(pdev->seg, pdev->bus); + if ( !bridge ) + return 0; + + range =3D prefetch ? bridge->bar_ranges_prefetch : bridge->bar_ranges; + + return rangeset_remove_range(range, addr, addr + size - 1); +} + /* * Local variables: * mode: C diff --git a/xen/arch/x86/include/asm/pci.h b/xen/arch/x86/include/asm/pci.h index 08e8959d0d..2cabbbb5d0 100644 --- a/xen/arch/x86/include/asm/pci.h +++ b/xen/arch/x86/include/asm/pci.h @@ -82,4 +82,18 @@ static inline bool hwdom_uses_vpci(void) return false; } =20 +static inline uint64_t pci_get_new_bar_addr(const struct pci_dev *pdev, + uint64_t size, bool is_64bit, + bool prefetch) +{ + return 0; +} + +static inline int pci_reserve_bar_range(const struct pci_dev *pdev, + uint64_t addr, uint64_t size, + bool prefetch) +{ + return 0; +} + #endif /* __X86_PCI_H__ */ diff --git a/xen/common/rangeset.c b/xen/common/rangeset.c index 0e3b9acd35..c1c6f8610c 100644 --- a/xen/common/rangeset.c +++ b/xen/common/rangeset.c @@ -357,6 +357,41 @@ int rangeset_claim_range(struct rangeset *r, unsigned = long size, return 0; } =20 +int rangeset_find_aligned_range(struct rangeset *r, unsigned long size, + unsigned long min, unsigned long *s) +{ + struct range *x; + + /* Power of 2 check */ + if ( (size & (size - 1)) !=3D 0 ) + { + *s =3D 0; + return -EINVAL; + } + + read_lock(&r->lock); + + for ( x =3D first_range(r); x; x =3D next_range(r, x) ) + { + /* Assumes size is a power of 2 */ + unsigned long start_aligned =3D (x->s + size - 1) & ~(size - 1); + + if ( x->e > start_aligned && + (x->e - start_aligned) >=3D size && + start_aligned >=3D min ) + { + read_unlock(&r->lock); + *s =3D start_aligned; + return 0; + } + } + + read_unlock(&r->lock); + *s =3D 0; + + return -ENOSPC; +} + int rangeset_consume_ranges(struct rangeset *r, int (*cb)(unsigned long s, unsigned long e, void *ctxt, unsigned long *c), diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c index 3edcfa8a04..4f5de9a542 100644 --- a/xen/drivers/passthrough/pci.c +++ b/xen/drivers/passthrough/pci.c @@ -1172,6 +1172,80 @@ int __init scan_pci_devices(void) return ret; } =20 +static void __init cf_check reserve_bar_range(struct pci_dev *pdev, uint8_= t reg, + uint64_t addr, uint64_t size, + bool is_64bit, bool prefetch) +{ + if ( pci_check_bar(pdev, maddr_to_mfn(addr), + maddr_to_mfn(addr + size - 1)) ) + pci_reserve_bar_range(pdev, addr, size, prefetch); +} + +static void __init cf_check get_new_bar_addr(struct pci_dev *pdev, uint8_t= reg, + uint64_t addr, uint64_t size, + bool is_64bit, bool prefetch) +{ + if ( !pci_check_bar(pdev, maddr_to_mfn(addr), + maddr_to_mfn(addr + size - 1)) ) + { + uint16_t cmd =3D pci_conf_read16(pdev->sbdf, PCI_COMMAND); + + addr =3D pci_get_new_bar_addr(pdev, size, is_64bit, prefetch); + + pci_conf_write16(pdev->sbdf, PCI_COMMAND, + cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO)); + + pci_conf_write32(pdev->sbdf, reg, + (addr & GENMASK(31, 0)) | + (is_64bit ? PCI_BASE_ADDRESS_MEM_TYPE_64 : 0)); + + if ( is_64bit ) + pci_conf_write32(pdev->sbdf, reg + 4, addr >> 32); + + pci_conf_write16(pdev->sbdf, PCI_COMMAND, cmd); + } +} + +static int __init cf_check bars_iterate(struct pci_seg *pseg, void *arg) +{ + struct pci_dev *pdev; + unsigned int i, ret, num_bars =3D PCI_HEADER_NORMAL_NR_BARS; + uint64_t addr, size; + void (*cb)(struct pci_dev *, uint8_t, uint64_t, uint64_t, bool, bool) = =3D arg; + + list_for_each_entry ( pdev, &pseg->alldevs_list, alldevs_list ) + { + if ( (pci_conf_read8(pdev->sbdf, PCI_HEADER_TYPE) & 0x7f) =3D=3D + PCI_HEADER_TYPE_NORMAL ) + { + for ( i =3D 0; i < num_bars; i +=3D ret ) + { + uint8_t reg =3D PCI_BASE_ADDRESS_0 + i * 4; + bool prefetch; + + if ( (pci_conf_read32(pdev->sbdf, reg) & PCI_BASE_ADDRESS_= SPACE) + =3D=3D PCI_BASE_ADDRESS_SPACE_IO ) + { + ret =3D 1; + continue; + } + + ret =3D pci_size_mem_bar(pdev->sbdf, reg, &addr, &size, + (i =3D=3D num_bars - 1) ? PCI_BAR_LA= ST : 0); + + if ( !size ) + continue; + prefetch =3D !!(pci_conf_read32(pdev->sbdf, reg) & + PCI_BASE_ADDRESS_MEM_PREFETCH); + + cb(pdev, reg, addr, size, ret =3D=3D 2, prefetch); + } + } + } + + return 0; +} + struct setup_hwdom { struct domain *d; int (*handler)(uint8_t devfn, struct pci_dev *pdev); @@ -1263,6 +1337,11 @@ void __hwdom_init setup_hwdom_pci_devices( struct setup_hwdom ctxt =3D { .d =3D d, .handler =3D handler }; =20 pcidevs_lock(); + if ( hwdom_uses_vpci() ) + { + pci_segments_iterate(bars_iterate, reserve_bar_range); + pci_segments_iterate(bars_iterate, get_new_bar_addr); + } pci_segments_iterate(_setup_hwdom_pci_devices, &ctxt); pcidevs_unlock(); } diff --git a/xen/include/xen/rangeset.h b/xen/include/xen/rangeset.h index 817505badf..e71e810f82 100644 --- a/xen/include/xen/rangeset.h +++ b/xen/include/xen/rangeset.h @@ -56,11 +56,15 @@ void rangeset_limit( bool __must_check rangeset_is_empty( const struct rangeset *r); =20 -/* Add/claim/remove/query/purge a numeric range. */ +/* Add/claim/find/remove/query/purge a numeric range. */ int __must_check rangeset_add_range( struct rangeset *r, unsigned long s, unsigned long e); 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charset="utf-8" From: Luca Fancellu Hook up existing PCI setup routines for hwdom into Arm iommu initialization sequence, only assign endpoint devices. During scanned PCI device assignment, also permit access to the BAR ranges if hwdom is using vpci. Signed-off-by: Stewart Hildebrand Signed-off-by: Luca Fancellu Signed-off-by: Mykyta Poturai --- xen/drivers/passthrough/arm/iommu.c | 9 +++++++ xen/drivers/passthrough/pci.c | 40 ++++++++++++++++++++++++++++- 2 files changed, 48 insertions(+), 1 deletion(-) diff --git a/xen/drivers/passthrough/arm/iommu.c b/xen/drivers/passthrough/= arm/iommu.c index 100545e23f..d110520e0d 100644 --- a/xen/drivers/passthrough/arm/iommu.c +++ b/xen/drivers/passthrough/arm/iommu.c @@ -19,6 +19,7 @@ #include #include #include +#include =20 #include =20 @@ -133,6 +134,12 @@ void arch_iommu_domain_destroy(struct domain *d) { } =20 +static int iommu_add_hwdom_pci_device(u8 devfn, struct pci_dev *pdev) +{ + const struct domain_iommu *hd =3D dom_iommu(hardware_domain); + return iommu_call(hd->platform_ops, add_device, devfn, pci_to_dev(pdev= )); +} + void __hwdom_init arch_iommu_hwdom_init(struct domain *d) { /* Set to false options not supported on ARM. */ @@ -142,6 +149,8 @@ void __hwdom_init arch_iommu_hwdom_init(struct domain *= d) if ( iommu_hwdom_reserved =3D=3D 1 ) printk(XENLOG_WARNING "map-reserved dom0-iommu option is not suppo= rted on ARM\n"); iommu_hwdom_reserved =3D 0; + + setup_hwdom_pci_devices(d, iommu_add_hwdom_pci_device); } =20 /* diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c index 4f5de9a542..534faaaa84 100644 --- a/xen/drivers/passthrough/pci.c +++ b/xen/drivers/passthrough/pci.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -1040,6 +1041,12 @@ enum pdev_type pdev_type(u16 seg, u8 bus, u8 devfn) return pos ? DEV_TYPE_PCIe_ENDPOINT : DEV_TYPE_PCI; } =20 +static bool pdev_is_endpoint(struct pci_dev *pdev) +{ + enum pdev_type type =3D pdev_type(pdev->seg, pdev->bus, pdev->devfn); + return type =3D=3D DEV_TYPE_PCIe_ENDPOINT || type =3D=3D DEV_TYPE_PCI; +} + /* * find the upstream PCIe-to-PCI/PCIX bridge or PCI legacy bridge * return 0: the device is integrated PCI device or PCIe @@ -1255,7 +1262,7 @@ static void __hwdom_init setup_one_hwdom_device(const= struct setup_hwdom *ctxt, struct pci_dev *pdev) { u8 devfn =3D pdev->devfn; - int err; + int err, i, rc; =20 do { err =3D ctxt->handler(devfn, pdev); @@ -1276,6 +1283,34 @@ static void __hwdom_init setup_one_hwdom_device(cons= t struct setup_hwdom *ctxt, if ( err ) printk(XENLOG_ERR "setup of vPCI for d%d failed: %d\n", ctxt->d->domain_id, err); + + if ( !hwdom_uses_vpci() ) + return; + + for ( i =3D 0; i < PCI_HEADER_NORMAL_NR_BARS; i +=3D rc ) + { + uint64_t addr, size; + uint8_t reg =3D PCI_BASE_ADDRESS_0 + i * 4; + + if ( (pci_conf_read32(pdev->sbdf, reg) & PCI_BASE_ADDRESS_SPACE) + =3D=3D PCI_BASE_ADDRESS_SPACE_IO ) + { + rc =3D 1; + continue; + } + + rc =3D pci_size_mem_bar(pdev->sbdf, reg, &addr, &size, + (i =3D=3D PCI_HEADER_NORMAL_NR_BARS - 1) + ? 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charset="utf-8" With pci-scan implemented it is now possible to use vpci for hardware domains. Update has_vpci to reflrect this change. Signed-off-by: Mykyta Poturai --- xen/arch/arm/include/asm/domain.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/xen/arch/arm/include/asm/domain.h b/xen/arch/arm/include/asm/d= omain.h index af3e168374..dbe3347cea 100644 --- a/xen/arch/arm/include/asm/domain.h +++ b/xen/arch/arm/include/asm/domain.h @@ -305,8 +305,7 @@ static inline void arch_vcpu_block(struct vcpu *v) {} =20 #define arch_vm_assist_valid_mask(d) (1UL << VMASST_TYPE_runstate_update_f= lag) =20 -/* vPCI is not available on Arm */ -#define has_vpci(d) ({ (void)(d); false; }) +#define has_vpci(d) (is_hardware_domain(d) && hwdom_uses_vpci()) =20 struct arch_vcpu_io { struct instr_details dabt_instr; /* when the instruction is decoded */ --=20 2.34.1