| Message ID | 20240105062217.349645-3-Jiqian.Chen@amd.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Support device passthrough when dom0 is PVH on Xen | expand |
On Fri, 5 Jan 2024, Jiqian Chen wrote: > In PVH dom0, the gsis don't get registered, but the gsi of > a passthrough device must be configured for it to be able to be > mapped into a domU. > > When assign a device to passthrough, proactively setup the gsi > of the device during that process. > > Co-developed-by: Huang Rui <ray.huang@amd.com> > Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com> > --- > arch/x86/xen/enlighten_pvh.c | 90 ++++++++++++++++++++++++++++++ > drivers/acpi/pci_irq.c | 2 +- > drivers/xen/xen-pciback/pci_stub.c | 8 +++ > include/linux/acpi.h | 1 + > include/xen/acpi.h | 6 ++ > 5 files changed, 106 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c > index ada3868c02c2..ecadd966c684 100644 > --- a/arch/x86/xen/enlighten_pvh.c > +++ b/arch/x86/xen/enlighten_pvh.c > @@ -1,6 +1,7 @@ > // SPDX-License-Identifier: GPL-2.0 > #include <linux/acpi.h> > #include <linux/export.h> > +#include <linux/pci.h> > > #include <xen/hvc-console.h> > > @@ -25,6 +26,95 @@ > bool __ro_after_init xen_pvh; > EXPORT_SYMBOL_GPL(xen_pvh); > > +typedef struct gsi_info { > + int gsi; > + int trigger; > + int polarity; > +} gsi_info_t; > + > +struct acpi_prt_entry { > + struct acpi_pci_id id; > + u8 pin; > + acpi_handle link; > + u32 index; /* GSI, or link _CRS index */ > +}; > + > +static int xen_pvh_get_gsi_info(struct pci_dev *dev, > + gsi_info_t *gsi_info) > +{ > + int gsi; > + u8 pin = 0; > + struct acpi_prt_entry *entry; > + int trigger = ACPI_LEVEL_SENSITIVE; > + int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ? > + ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW; > + > + if (dev) > + pin = dev->pin; This is minor, but you can just move the pin = dev->pin after the !dev check below. With that change, and assuming the Xen-side and QEMU-side patches are accepted: Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> > + if (!dev || !pin || !gsi_info) > + return -EINVAL; > + > + entry = acpi_pci_irq_lookup(dev, pin); > + if (entry) { > + if (entry->link) > + gsi = acpi_pci_link_allocate_irq(entry->link, > + entry->index, > + &trigger, &polarity, > + NULL); > + else > + gsi = entry->index; > + } else > + gsi = -1; > + > + if (gsi < 0) > + return -EINVAL; > + > + gsi_info->gsi = gsi; > + gsi_info->trigger = trigger; > + gsi_info->polarity = polarity; > + > + return 0; > +} > + > +static int xen_pvh_setup_gsi(gsi_info_t *gsi_info) > +{ > + struct physdev_setup_gsi setup_gsi; > + > + if (!gsi_info) > + return -EINVAL; > + > + setup_gsi.gsi = gsi_info->gsi; > + setup_gsi.triggering = (gsi_info->trigger == ACPI_EDGE_SENSITIVE ? 0 : 1); > + setup_gsi.polarity = (gsi_info->polarity == ACPI_ACTIVE_HIGH ? 0 : 1); > + > + return HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi); > +} > + > +int xen_pvh_passthrough_gsi(struct pci_dev *dev) > +{ > + int ret; > + gsi_info_t gsi_info; > + > + if (!dev) > + return -EINVAL; > + > + ret = xen_pvh_get_gsi_info(dev, &gsi_info); > + if (ret) { > + xen_raw_printk("Fail to get gsi info!\n"); > + return ret; > + } > + > + ret = xen_pvh_setup_gsi(&gsi_info); > + if (ret == -EEXIST) { > + xen_raw_printk("Already setup the GSI :%d\n", gsi_info.gsi); > + ret = 0; > + } else if (ret) > + xen_raw_printk("Fail to setup GSI (%d)!\n", gsi_info.gsi); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(xen_pvh_passthrough_gsi); > + > void __init xen_pvh_init(struct boot_params *boot_params) > { > u32 msr; > diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c > index ff30ceca2203..630fe0a34bc6 100644 > --- a/drivers/acpi/pci_irq.c > +++ b/drivers/acpi/pci_irq.c > @@ -288,7 +288,7 @@ static int acpi_reroute_boot_interrupt(struct pci_dev *dev, > } > #endif /* CONFIG_X86_IO_APIC */ > > -static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) > +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) > { > struct acpi_prt_entry *entry = NULL; > struct pci_dev *bridge; > diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c > index 46c40ec8a18e..22d4380d2b04 100644 > --- a/drivers/xen/xen-pciback/pci_stub.c > +++ b/drivers/xen/xen-pciback/pci_stub.c > @@ -20,6 +20,7 @@ > #include <linux/atomic.h> > #include <xen/events.h> > #include <xen/pci.h> > +#include <xen/acpi.h> > #include <xen/xen.h> > #include <asm/xen/hypervisor.h> > #include <xen/interface/physdev.h> > @@ -435,6 +436,13 @@ static int pcistub_init_device(struct pci_dev *dev) > goto config_release; > pci_restore_state(dev); > } > + > + if (xen_initial_domain() && xen_pvh_domain()) { > + err = xen_pvh_passthrough_gsi(dev); > + if (err) > + goto config_release; > + } > + > /* Now disable the device (this also ensures some private device > * data is setup before we export) > */ > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 4db54e928b36..7ea3be981cc3 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -360,6 +360,7 @@ void acpi_unregister_gsi (u32 gsi); > > struct pci_dev; > > +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin); > int acpi_pci_irq_enable (struct pci_dev *dev); > void acpi_penalize_isa_irq(int irq, int active); > bool acpi_isa_irq_available(int irq); > diff --git a/include/xen/acpi.h b/include/xen/acpi.h > index b1e11863144d..17c4d37f1e60 100644 > --- a/include/xen/acpi.h > +++ b/include/xen/acpi.h > @@ -67,10 +67,16 @@ static inline void xen_acpi_sleep_register(void) > acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel; > } > } > +int xen_pvh_passthrough_gsi(struct pci_dev *dev); > #else > static inline void xen_acpi_sleep_register(void) > { > } > + > +static inline int xen_pvh_passthrough_gsi(struct pci_dev *dev) > +{ > + return -1; > +} > #endif > > #endif /* _XEN_ACPI_H */ > -- > 2.34.1 >
On 2024/2/23 08:23, Stefano Stabellini wrote: > On Fri, 5 Jan 2024, Jiqian Chen wrote: >> In PVH dom0, the gsis don't get registered, but the gsi of >> a passthrough device must be configured for it to be able to be >> mapped into a domU. >> >> When assign a device to passthrough, proactively setup the gsi >> of the device during that process. >> >> Co-developed-by: Huang Rui <ray.huang@amd.com> >> Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com> >> --- >> arch/x86/xen/enlighten_pvh.c | 90 ++++++++++++++++++++++++++++++ >> drivers/acpi/pci_irq.c | 2 +- >> drivers/xen/xen-pciback/pci_stub.c | 8 +++ >> include/linux/acpi.h | 1 + >> include/xen/acpi.h | 6 ++ >> 5 files changed, 106 insertions(+), 1 deletion(-) >> >> diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c >> index ada3868c02c2..ecadd966c684 100644 >> --- a/arch/x86/xen/enlighten_pvh.c >> +++ b/arch/x86/xen/enlighten_pvh.c >> @@ -1,6 +1,7 @@ >> // SPDX-License-Identifier: GPL-2.0 >> #include <linux/acpi.h> >> #include <linux/export.h> >> +#include <linux/pci.h> >> >> #include <xen/hvc-console.h> >> >> @@ -25,6 +26,95 @@ >> bool __ro_after_init xen_pvh; >> EXPORT_SYMBOL_GPL(xen_pvh); >> >> +typedef struct gsi_info { >> + int gsi; >> + int trigger; >> + int polarity; >> +} gsi_info_t; >> + >> +struct acpi_prt_entry { >> + struct acpi_pci_id id; >> + u8 pin; >> + acpi_handle link; >> + u32 index; /* GSI, or link _CRS index */ >> +}; >> + >> +static int xen_pvh_get_gsi_info(struct pci_dev *dev, >> + gsi_info_t *gsi_info) >> +{ >> + int gsi; >> + u8 pin = 0; >> + struct acpi_prt_entry *entry; >> + int trigger = ACPI_LEVEL_SENSITIVE; >> + int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ? >> + ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW; >> + >> + if (dev) >> + pin = dev->pin; > > This is minor, but you can just move the pin = dev->pin after the !dev > check below. Will change in next version. > > With that change, and assuming the Xen-side and QEMU-side patches are > accepted: > > Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Thank you very much! > > > > >> + if (!dev || !pin || !gsi_info) >> + return -EINVAL; >> + >> + entry = acpi_pci_irq_lookup(dev, pin); >> + if (entry) { >> + if (entry->link) >> + gsi = acpi_pci_link_allocate_irq(entry->link, >> + entry->index, >> + &trigger, &polarity, >> + NULL); >> + else >> + gsi = entry->index; >> + } else >> + gsi = -1; >> + >> + if (gsi < 0) >> + return -EINVAL; >> + >> + gsi_info->gsi = gsi; >> + gsi_info->trigger = trigger; >> + gsi_info->polarity = polarity; >> + >> + return 0; >> +} >> + >> +static int xen_pvh_setup_gsi(gsi_info_t *gsi_info) >> +{ >> + struct physdev_setup_gsi setup_gsi; >> + >> + if (!gsi_info) >> + return -EINVAL; >> + >> + setup_gsi.gsi = gsi_info->gsi; >> + setup_gsi.triggering = (gsi_info->trigger == ACPI_EDGE_SENSITIVE ? 0 : 1); >> + setup_gsi.polarity = (gsi_info->polarity == ACPI_ACTIVE_HIGH ? 0 : 1); >> + >> + return HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi); >> +} >> + >> +int xen_pvh_passthrough_gsi(struct pci_dev *dev) >> +{ >> + int ret; >> + gsi_info_t gsi_info; >> + >> + if (!dev) >> + return -EINVAL; >> + >> + ret = xen_pvh_get_gsi_info(dev, &gsi_info); >> + if (ret) { >> + xen_raw_printk("Fail to get gsi info!\n"); >> + return ret; >> + } >> + >> + ret = xen_pvh_setup_gsi(&gsi_info); >> + if (ret == -EEXIST) { >> + xen_raw_printk("Already setup the GSI :%d\n", gsi_info.gsi); >> + ret = 0; >> + } else if (ret) >> + xen_raw_printk("Fail to setup GSI (%d)!\n", gsi_info.gsi); >> + >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(xen_pvh_passthrough_gsi); >> + >> void __init xen_pvh_init(struct boot_params *boot_params) >> { >> u32 msr; >> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c >> index ff30ceca2203..630fe0a34bc6 100644 >> --- a/drivers/acpi/pci_irq.c >> +++ b/drivers/acpi/pci_irq.c >> @@ -288,7 +288,7 @@ static int acpi_reroute_boot_interrupt(struct pci_dev *dev, >> } >> #endif /* CONFIG_X86_IO_APIC */ >> >> -static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) >> +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) >> { >> struct acpi_prt_entry *entry = NULL; >> struct pci_dev *bridge; >> diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c >> index 46c40ec8a18e..22d4380d2b04 100644 >> --- a/drivers/xen/xen-pciback/pci_stub.c >> +++ b/drivers/xen/xen-pciback/pci_stub.c >> @@ -20,6 +20,7 @@ >> #include <linux/atomic.h> >> #include <xen/events.h> >> #include <xen/pci.h> >> +#include <xen/acpi.h> >> #include <xen/xen.h> >> #include <asm/xen/hypervisor.h> >> #include <xen/interface/physdev.h> >> @@ -435,6 +436,13 @@ static int pcistub_init_device(struct pci_dev *dev) >> goto config_release; >> pci_restore_state(dev); >> } >> + >> + if (xen_initial_domain() && xen_pvh_domain()) { >> + err = xen_pvh_passthrough_gsi(dev); >> + if (err) >> + goto config_release; >> + } >> + >> /* Now disable the device (this also ensures some private device >> * data is setup before we export) >> */ >> diff --git a/include/linux/acpi.h b/include/linux/acpi.h >> index 4db54e928b36..7ea3be981cc3 100644 >> --- a/include/linux/acpi.h >> +++ b/include/linux/acpi.h >> @@ -360,6 +360,7 @@ void acpi_unregister_gsi (u32 gsi); >> >> struct pci_dev; >> >> +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin); >> int acpi_pci_irq_enable (struct pci_dev *dev); >> void acpi_penalize_isa_irq(int irq, int active); >> bool acpi_isa_irq_available(int irq); >> diff --git a/include/xen/acpi.h b/include/xen/acpi.h >> index b1e11863144d..17c4d37f1e60 100644 >> --- a/include/xen/acpi.h >> +++ b/include/xen/acpi.h >> @@ -67,10 +67,16 @@ static inline void xen_acpi_sleep_register(void) >> acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel; >> } >> } >> +int xen_pvh_passthrough_gsi(struct pci_dev *dev); >> #else >> static inline void xen_acpi_sleep_register(void) >> { >> } >> + >> +static inline int xen_pvh_passthrough_gsi(struct pci_dev *dev) >> +{ >> + return -1; >> +} >> #endif >> >> #endif /* _XEN_ACPI_H */ >> -- >> 2.34.1 >>
diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c index ada3868c02c2..ecadd966c684 100644 --- a/arch/x86/xen/enlighten_pvh.c +++ b/arch/x86/xen/enlighten_pvh.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/acpi.h> #include <linux/export.h> +#include <linux/pci.h> #include <xen/hvc-console.h> @@ -25,6 +26,95 @@ bool __ro_after_init xen_pvh; EXPORT_SYMBOL_GPL(xen_pvh); +typedef struct gsi_info { + int gsi; + int trigger; + int polarity; +} gsi_info_t; + +struct acpi_prt_entry { + struct acpi_pci_id id; + u8 pin; + acpi_handle link; + u32 index; /* GSI, or link _CRS index */ +}; + +static int xen_pvh_get_gsi_info(struct pci_dev *dev, + gsi_info_t *gsi_info) +{ + int gsi; + u8 pin = 0; + struct acpi_prt_entry *entry; + int trigger = ACPI_LEVEL_SENSITIVE; + int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ? + ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW; + + if (dev) + pin = dev->pin; + if (!dev || !pin || !gsi_info) + return -EINVAL; + + entry = acpi_pci_irq_lookup(dev, pin); + if (entry) { + if (entry->link) + gsi = acpi_pci_link_allocate_irq(entry->link, + entry->index, + &trigger, &polarity, + NULL); + else + gsi = entry->index; + } else + gsi = -1; + + if (gsi < 0) + return -EINVAL; + + gsi_info->gsi = gsi; + gsi_info->trigger = trigger; + gsi_info->polarity = polarity; + + return 0; +} + +static int xen_pvh_setup_gsi(gsi_info_t *gsi_info) +{ + struct physdev_setup_gsi setup_gsi; + + if (!gsi_info) + return -EINVAL; + + setup_gsi.gsi = gsi_info->gsi; + setup_gsi.triggering = (gsi_info->trigger == ACPI_EDGE_SENSITIVE ? 0 : 1); + setup_gsi.polarity = (gsi_info->polarity == ACPI_ACTIVE_HIGH ? 0 : 1); + + return HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi); +} + +int xen_pvh_passthrough_gsi(struct pci_dev *dev) +{ + int ret; + gsi_info_t gsi_info; + + if (!dev) + return -EINVAL; + + ret = xen_pvh_get_gsi_info(dev, &gsi_info); + if (ret) { + xen_raw_printk("Fail to get gsi info!\n"); + return ret; + } + + ret = xen_pvh_setup_gsi(&gsi_info); + if (ret == -EEXIST) { + xen_raw_printk("Already setup the GSI :%d\n", gsi_info.gsi); + ret = 0; + } else if (ret) + xen_raw_printk("Fail to setup GSI (%d)!\n", gsi_info.gsi); + + return ret; +} +EXPORT_SYMBOL_GPL(xen_pvh_passthrough_gsi); + void __init xen_pvh_init(struct boot_params *boot_params) { u32 msr; diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c index ff30ceca2203..630fe0a34bc6 100644 --- a/drivers/acpi/pci_irq.c +++ b/drivers/acpi/pci_irq.c @@ -288,7 +288,7 @@ static int acpi_reroute_boot_interrupt(struct pci_dev *dev, } #endif /* CONFIG_X86_IO_APIC */ -static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) { struct acpi_prt_entry *entry = NULL; struct pci_dev *bridge; diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c index 46c40ec8a18e..22d4380d2b04 100644 --- a/drivers/xen/xen-pciback/pci_stub.c +++ b/drivers/xen/xen-pciback/pci_stub.c @@ -20,6 +20,7 @@ #include <linux/atomic.h> #include <xen/events.h> #include <xen/pci.h> +#include <xen/acpi.h> #include <xen/xen.h> #include <asm/xen/hypervisor.h> #include <xen/interface/physdev.h> @@ -435,6 +436,13 @@ static int pcistub_init_device(struct pci_dev *dev) goto config_release; pci_restore_state(dev); } + + if (xen_initial_domain() && xen_pvh_domain()) { + err = xen_pvh_passthrough_gsi(dev); + if (err) + goto config_release; + } + /* Now disable the device (this also ensures some private device * data is setup before we export) */ diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 4db54e928b36..7ea3be981cc3 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -360,6 +360,7 @@ void acpi_unregister_gsi (u32 gsi); struct pci_dev; +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin); int acpi_pci_irq_enable (struct pci_dev *dev); void acpi_penalize_isa_irq(int irq, int active); bool acpi_isa_irq_available(int irq); diff --git a/include/xen/acpi.h b/include/xen/acpi.h index b1e11863144d..17c4d37f1e60 100644 --- a/include/xen/acpi.h +++ b/include/xen/acpi.h @@ -67,10 +67,16 @@ static inline void xen_acpi_sleep_register(void) acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel; } } +int xen_pvh_passthrough_gsi(struct pci_dev *dev); #else static inline void xen_acpi_sleep_register(void) { } + +static inline int xen_pvh_passthrough_gsi(struct pci_dev *dev) +{ + return -1; +} #endif #endif /* _XEN_ACPI_H */
In PVH dom0, the gsis don't get registered, but the gsi of a passthrough device must be configured for it to be able to be mapped into a domU. When assign a device to passthrough, proactively setup the gsi of the device during that process. Co-developed-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com> --- arch/x86/xen/enlighten_pvh.c | 90 ++++++++++++++++++++++++++++++ drivers/acpi/pci_irq.c | 2 +- drivers/xen/xen-pciback/pci_stub.c | 8 +++ include/linux/acpi.h | 1 + include/xen/acpi.h | 6 ++ 5 files changed, 106 insertions(+), 1 deletion(-)