| Message ID | 1610488352-18494-19-git-send-email-olekstysh@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | IOREQ feature (+ virtio-mmio) on Arm | expand |
On Tue, 12 Jan 2021, Oleksandr Tyshchenko wrote: > From: Julien Grall <julien.grall@arm.com> > > This patch adds ability to the device emulator to notify otherend > (some entity running in the guest) using a SPI and implements Arm > specific bits for it. Proposed interface allows emulator to set > the logical level of a one of a domain's IRQ lines. > > We can't reuse the existing DM op (xen_dm_op_set_isa_irq_level) > to inject an interrupt as the "isa_irq" field is only 8-bit and > able to cover IRQ 0 - 255, whereas we need a wider range (0 - 1020). > > Please note, for egde-triggered interrupt (which is used for > the virtio-mmio emulation) we only trigger the interrupt on Arm > if the level is asserted (rising edge) and do nothing if the level > is deasserted (falling edge), so the call could be named "trigger_irq" > (without the level parameter). But, in order to model the line closely > (to be able to support level-triggered interrupt) we need to know whether > the line is low or high, so the proposed interface has been chosen. > However, it is worth mentioning that in case of the level-triggered > interrupt, we should keep injecting the interrupt to the guest until > the line is deasserted (this is not covered by current patch). > > Signed-off-by: Julien Grall <julien.grall@arm.com> > Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> > [On Arm only] > Tested-by: Wei Chen <Wei.Chen@arm.com> Acked-by: Stefano Stabellini <sstabellini@kernel.org> > --- > Please note, this is a split/cleanup/hardening of Julien's PoC: > "Add support for Guest IO forwarding to a device emulator" > > Changes RFC -> V1: > - check incoming parameters in arch_dm_op() > - add explicit padding to struct xen_dm_op_set_irq_level > > Changes V1 -> V2: > - update the author of a patch > - update patch description > - check that padding is always 0 > - mention that interface is Arm only and only SPIs are > supported for now > - allow to set the logical level of a line for non-allocated > interrupts only > - add xen_dm_op_set_irq_level_t > > Changes V2 -> V3: > - no changes > > Changes V3 -> V4: > - update patch description > - update patch according to the IOREQ related dm-op handling changes > --- > tools/include/xendevicemodel.h | 4 +++ > tools/libs/devicemodel/core.c | 18 ++++++++++ > tools/libs/devicemodel/libxendevicemodel.map | 1 + > xen/arch/arm/dm.c | 54 +++++++++++++++++++++++++++- > xen/include/public/hvm/dm_op.h | 16 +++++++++ > 5 files changed, 92 insertions(+), 1 deletion(-) > > diff --git a/tools/include/xendevicemodel.h b/tools/include/xendevicemodel.h > index e877f5c..c06b3c8 100644 > --- a/tools/include/xendevicemodel.h > +++ b/tools/include/xendevicemodel.h > @@ -209,6 +209,10 @@ int xendevicemodel_set_isa_irq_level( > xendevicemodel_handle *dmod, domid_t domid, uint8_t irq, > unsigned int level); > > +int xendevicemodel_set_irq_level( > + xendevicemodel_handle *dmod, domid_t domid, unsigned int irq, > + unsigned int level); > + > /** > * This function maps a PCI INTx line to a an IRQ line. > * > diff --git a/tools/libs/devicemodel/core.c b/tools/libs/devicemodel/core.c > index 4d40639..30bd79f 100644 > --- a/tools/libs/devicemodel/core.c > +++ b/tools/libs/devicemodel/core.c > @@ -430,6 +430,24 @@ int xendevicemodel_set_isa_irq_level( > return xendevicemodel_op(dmod, domid, 1, &op, sizeof(op)); > } > > +int xendevicemodel_set_irq_level( > + xendevicemodel_handle *dmod, domid_t domid, uint32_t irq, > + unsigned int level) > +{ > + struct xen_dm_op op; > + struct xen_dm_op_set_irq_level *data; > + > + memset(&op, 0, sizeof(op)); > + > + op.op = XEN_DMOP_set_irq_level; > + data = &op.u.set_irq_level; > + > + data->irq = irq; > + data->level = level; > + > + return xendevicemodel_op(dmod, domid, 1, &op, sizeof(op)); > +} > + > int xendevicemodel_set_pci_link_route( > xendevicemodel_handle *dmod, domid_t domid, uint8_t link, uint8_t irq) > { > diff --git a/tools/libs/devicemodel/libxendevicemodel.map b/tools/libs/devicemodel/libxendevicemodel.map > index 561c62d..a0c3012 100644 > --- a/tools/libs/devicemodel/libxendevicemodel.map > +++ b/tools/libs/devicemodel/libxendevicemodel.map > @@ -32,6 +32,7 @@ VERS_1.2 { > global: > xendevicemodel_relocate_memory; > xendevicemodel_pin_memory_cacheattr; > + xendevicemodel_set_irq_level; > } VERS_1.1; > > VERS_1.3 { > diff --git a/xen/arch/arm/dm.c b/xen/arch/arm/dm.c > index e6dedf4..804830a 100644 > --- a/xen/arch/arm/dm.c > +++ b/xen/arch/arm/dm.c > @@ -20,6 +20,8 @@ > #include <xen/ioreq.h> > #include <xen/nospec.h> > > +#include <asm/vgic.h> > + > static int dm_op(const struct dmop_args *op_args) > { > struct domain *d; > @@ -35,6 +37,7 @@ static int dm_op(const struct dmop_args *op_args) > [XEN_DMOP_unmap_io_range_from_ioreq_server] = sizeof(struct xen_dm_op_ioreq_server_range), > [XEN_DMOP_set_ioreq_server_state] = sizeof(struct xen_dm_op_set_ioreq_server_state), > [XEN_DMOP_destroy_ioreq_server] = sizeof(struct xen_dm_op_destroy_ioreq_server), > + [XEN_DMOP_set_irq_level] = sizeof(struct xen_dm_op_set_irq_level), > }; > > rc = rcu_lock_remote_domain_by_id(op_args->domid, &d); > @@ -73,7 +76,56 @@ static int dm_op(const struct dmop_args *op_args) > if ( op.pad ) > goto out; > > - rc = ioreq_server_dm_op(&op, d, &const_op); > + switch ( op.op ) > + { > + case XEN_DMOP_set_irq_level: > + { > + const struct xen_dm_op_set_irq_level *data = > + &op.u.set_irq_level; > + unsigned int i; > + > + /* Only SPIs are supported */ > + if ( (data->irq < NR_LOCAL_IRQS) || (data->irq >= vgic_num_irqs(d)) ) > + { > + rc = -EINVAL; > + break; > + } > + > + if ( data->level != 0 && data->level != 1 ) > + { > + rc = -EINVAL; > + break; > + } > + > + /* Check that padding is always 0 */ > + for ( i = 0; i < sizeof(data->pad); i++ ) > + { > + if ( data->pad[i] ) > + { > + rc = -EINVAL; > + break; > + } > + } > + > + /* > + * Allow to set the logical level of a line for non-allocated > + * interrupts only. > + */ > + if ( test_bit(data->irq, d->arch.vgic.allocated_irqs) ) > + { > + rc = -EINVAL; > + break; > + } > + > + vgic_inject_irq(d, NULL, data->irq, data->level); > + rc = 0; > + break; > + } > + > + default: > + rc = ioreq_server_dm_op(&op, d, &const_op); > + break; > + } > > if ( (!rc || rc == -ERESTART) && > !const_op && copy_to_guest_offset(op_args->buf[0].h, offset, > diff --git a/xen/include/public/hvm/dm_op.h b/xen/include/public/hvm/dm_op.h > index 66cae1a..1f70d58 100644 > --- a/xen/include/public/hvm/dm_op.h > +++ b/xen/include/public/hvm/dm_op.h > @@ -434,6 +434,21 @@ struct xen_dm_op_pin_memory_cacheattr { > }; > typedef struct xen_dm_op_pin_memory_cacheattr xen_dm_op_pin_memory_cacheattr_t; > > +/* > + * XEN_DMOP_set_irq_level: Set the logical level of a one of a domain's > + * IRQ lines (currently Arm only). > + * Only SPIs are supported. > + */ > +#define XEN_DMOP_set_irq_level 19 > + > +struct xen_dm_op_set_irq_level { > + uint32_t irq; > + /* IN - Level: 0 -> deasserted, 1 -> asserted */ > + uint8_t level; > + uint8_t pad[3]; > +}; > +typedef struct xen_dm_op_set_irq_level xen_dm_op_set_irq_level_t; > + > struct xen_dm_op { > uint32_t op; > uint32_t pad; > @@ -447,6 +462,7 @@ struct xen_dm_op { > xen_dm_op_track_dirty_vram_t track_dirty_vram; > xen_dm_op_set_pci_intx_level_t set_pci_intx_level; > xen_dm_op_set_isa_irq_level_t set_isa_irq_level; > + xen_dm_op_set_irq_level_t set_irq_level; > xen_dm_op_set_pci_link_route_t set_pci_link_route; > xen_dm_op_modified_memory_t modified_memory; > xen_dm_op_set_mem_type_t set_mem_type; > -- > 2.7.4 >
diff --git a/tools/include/xendevicemodel.h b/tools/include/xendevicemodel.h index e877f5c..c06b3c8 100644 --- a/tools/include/xendevicemodel.h +++ b/tools/include/xendevicemodel.h @@ -209,6 +209,10 @@ int xendevicemodel_set_isa_irq_level( xendevicemodel_handle *dmod, domid_t domid, uint8_t irq, unsigned int level); +int xendevicemodel_set_irq_level( + xendevicemodel_handle *dmod, domid_t domid, unsigned int irq, + unsigned int level); + /** * This function maps a PCI INTx line to a an IRQ line. * diff --git a/tools/libs/devicemodel/core.c b/tools/libs/devicemodel/core.c index 4d40639..30bd79f 100644 --- a/tools/libs/devicemodel/core.c +++ b/tools/libs/devicemodel/core.c @@ -430,6 +430,24 @@ int xendevicemodel_set_isa_irq_level( return xendevicemodel_op(dmod, domid, 1, &op, sizeof(op)); } +int xendevicemodel_set_irq_level( + xendevicemodel_handle *dmod, domid_t domid, uint32_t irq, + unsigned int level) +{ + struct xen_dm_op op; + struct xen_dm_op_set_irq_level *data; + + memset(&op, 0, sizeof(op)); + + op.op = XEN_DMOP_set_irq_level; + data = &op.u.set_irq_level; + + data->irq = irq; + data->level = level; + + return xendevicemodel_op(dmod, domid, 1, &op, sizeof(op)); +} + int xendevicemodel_set_pci_link_route( xendevicemodel_handle *dmod, domid_t domid, uint8_t link, uint8_t irq) { diff --git a/tools/libs/devicemodel/libxendevicemodel.map b/tools/libs/devicemodel/libxendevicemodel.map index 561c62d..a0c3012 100644 --- a/tools/libs/devicemodel/libxendevicemodel.map +++ b/tools/libs/devicemodel/libxendevicemodel.map @@ -32,6 +32,7 @@ VERS_1.2 { global: xendevicemodel_relocate_memory; xendevicemodel_pin_memory_cacheattr; + xendevicemodel_set_irq_level; } VERS_1.1; VERS_1.3 { diff --git a/xen/arch/arm/dm.c b/xen/arch/arm/dm.c index e6dedf4..804830a 100644 --- a/xen/arch/arm/dm.c +++ b/xen/arch/arm/dm.c @@ -20,6 +20,8 @@ #include <xen/ioreq.h> #include <xen/nospec.h> +#include <asm/vgic.h> + static int dm_op(const struct dmop_args *op_args) { struct domain *d; @@ -35,6 +37,7 @@ static int dm_op(const struct dmop_args *op_args) [XEN_DMOP_unmap_io_range_from_ioreq_server] = sizeof(struct xen_dm_op_ioreq_server_range), [XEN_DMOP_set_ioreq_server_state] = sizeof(struct xen_dm_op_set_ioreq_server_state), [XEN_DMOP_destroy_ioreq_server] = sizeof(struct xen_dm_op_destroy_ioreq_server), + [XEN_DMOP_set_irq_level] = sizeof(struct xen_dm_op_set_irq_level), }; rc = rcu_lock_remote_domain_by_id(op_args->domid, &d); @@ -73,7 +76,56 @@ static int dm_op(const struct dmop_args *op_args) if ( op.pad ) goto out; - rc = ioreq_server_dm_op(&op, d, &const_op); + switch ( op.op ) + { + case XEN_DMOP_set_irq_level: + { + const struct xen_dm_op_set_irq_level *data = + &op.u.set_irq_level; + unsigned int i; + + /* Only SPIs are supported */ + if ( (data->irq < NR_LOCAL_IRQS) || (data->irq >= vgic_num_irqs(d)) ) + { + rc = -EINVAL; + break; + } + + if ( data->level != 0 && data->level != 1 ) + { + rc = -EINVAL; + break; + } + + /* Check that padding is always 0 */ + for ( i = 0; i < sizeof(data->pad); i++ ) + { + if ( data->pad[i] ) + { + rc = -EINVAL; + break; + } + } + + /* + * Allow to set the logical level of a line for non-allocated + * interrupts only. + */ + if ( test_bit(data->irq, d->arch.vgic.allocated_irqs) ) + { + rc = -EINVAL; + break; + } + + vgic_inject_irq(d, NULL, data->irq, data->level); + rc = 0; + break; + } + + default: + rc = ioreq_server_dm_op(&op, d, &const_op); + break; + } if ( (!rc || rc == -ERESTART) && !const_op && copy_to_guest_offset(op_args->buf[0].h, offset, diff --git a/xen/include/public/hvm/dm_op.h b/xen/include/public/hvm/dm_op.h index 66cae1a..1f70d58 100644 --- a/xen/include/public/hvm/dm_op.h +++ b/xen/include/public/hvm/dm_op.h @@ -434,6 +434,21 @@ struct xen_dm_op_pin_memory_cacheattr { }; typedef struct xen_dm_op_pin_memory_cacheattr xen_dm_op_pin_memory_cacheattr_t; +/* + * XEN_DMOP_set_irq_level: Set the logical level of a one of a domain's + * IRQ lines (currently Arm only). + * Only SPIs are supported. + */ +#define XEN_DMOP_set_irq_level 19 + +struct xen_dm_op_set_irq_level { + uint32_t irq; + /* IN - Level: 0 -> deasserted, 1 -> asserted */ + uint8_t level; + uint8_t pad[3]; +}; +typedef struct xen_dm_op_set_irq_level xen_dm_op_set_irq_level_t; + struct xen_dm_op { uint32_t op; uint32_t pad; @@ -447,6 +462,7 @@ struct xen_dm_op { xen_dm_op_track_dirty_vram_t track_dirty_vram; xen_dm_op_set_pci_intx_level_t set_pci_intx_level; xen_dm_op_set_isa_irq_level_t set_isa_irq_level; + xen_dm_op_set_irq_level_t set_irq_level; xen_dm_op_set_pci_link_route_t set_pci_link_route; xen_dm_op_modified_memory_t modified_memory; xen_dm_op_set_mem_type_t set_mem_type;