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Tue, 12 Jan 2021 13:53:02 -0800 (PST) From: Oleksandr Tyshchenko To: xen-devel@lists.xenproject.org Cc: Julien Grall , Jan Beulich , Andrew Cooper , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , Wei Liu , George Dunlap , Ian Jackson , Julien Grall , Stefano Stabellini , Paul Durrant , Daniel De Graaf , Oleksandr Tyshchenko Subject: [PATCH V4 09/24] xen/ioreq: Make x86's IOREQ related dm-op handling common Date: Tue, 12 Jan 2021 23:52:17 +0200 Message-Id: <1610488352-18494-10-git-send-email-olekstysh@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1610488352-18494-1-git-send-email-olekstysh@gmail.com> References: <1610488352-18494-1-git-send-email-olekstysh@gmail.com> From: Julien Grall As a lot of x86 code can be re-used on Arm later on, this patch moves the IOREQ related dm-op handling to the common code. The idea is to have the top level dm-op handling arch-specific and call into ioreq_server_dm_op() for otherwise unhandled ops. Pros: - More natural than doing it other way around (top level dm-op handling common). - Leave compat_dm_op() in x86 code. Cons: - Code duplication. Both arches have to duplicate do_dm_op(), etc. Also update XSM code a bit to let dm-op be used on Arm. This support is going to be used on Arm to be able run device emulator outside of Xen hypervisor. Signed-off-by: Julien Grall Signed-off-by: Oleksandr Tyshchenko [On Arm only] Tested-by: Wei Chen Acked-by: Jan Beulich --- Please note, this is a split/cleanup/hardening of Julien's PoC: "Add support for Guest IO forwarding to a device emulator" *** I decided to leave common dm.h to keep struct dmop_args declaration (to be included by Arm's dm.c), alternatively we could avoid introducing new header by moving the declaration into the existing header, but failed to find a suitable one which context would fit. *** Changes RFC -> V1: - update XSM, related changes were pulled from: [RFC PATCH V1 04/12] xen/arm: Introduce arch specific bits for IOREQ/DM features Changes V1 -> V2: - update the author of a patch - update patch description - introduce xen/dm.h and move definitions here Changes V2 -> V3: - no changes Changes V3 -> V4: - rework to have the top level dm-op handling arch-specific - update patch subject/description, was "xen/dm: Make x86's DM feature common" - make a few functions static in common ioreq.c --- xen/arch/x86/hvm/dm.c | 101 +----------------------------------- xen/common/ioreq.c | 135 ++++++++++++++++++++++++++++++++++++++++++------ xen/include/xen/dm.h | 39 ++++++++++++++ xen/include/xen/ioreq.h | 17 +----- xen/include/xsm/dummy.h | 4 +- xen/include/xsm/xsm.h | 6 +-- xen/xsm/dummy.c | 2 +- xen/xsm/flask/hooks.c | 5 +- 8 files changed, 171 insertions(+), 138 deletions(-) create mode 100644 xen/include/xen/dm.h diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c index d3e2a9e..dc8e47d 100644 --- a/xen/arch/x86/hvm/dm.c +++ b/xen/arch/x86/hvm/dm.c @@ -16,6 +16,7 @@ #include #include +#include #include #include #include @@ -29,13 +30,6 @@ #include -struct dmop_args { - domid_t domid; - unsigned int nr_bufs; - /* Reserve enough buf elements for all current hypercalls. */ - struct xen_dm_op_buf buf[2]; -}; - static bool _raw_copy_from_guest_buf_offset(void *dst, const struct dmop_args *args, unsigned int buf_idx, @@ -408,71 +402,6 @@ static int dm_op(const struct dmop_args *op_args) switch ( op.op ) { - case XEN_DMOP_create_ioreq_server: - { - struct xen_dm_op_create_ioreq_server *data = - &op.u.create_ioreq_server; - - const_op = false; - - rc = -EINVAL; - if ( data->pad[0] || data->pad[1] || data->pad[2] ) - break; - - rc = hvm_create_ioreq_server(d, data->handle_bufioreq, - &data->id); - break; - } - - case XEN_DMOP_get_ioreq_server_info: - { - struct xen_dm_op_get_ioreq_server_info *data = - &op.u.get_ioreq_server_info; - const uint16_t valid_flags = XEN_DMOP_no_gfns; - - const_op = false; - - rc = -EINVAL; - if ( data->flags & ~valid_flags ) - break; - - rc = hvm_get_ioreq_server_info(d, data->id, - (data->flags & XEN_DMOP_no_gfns) ? - NULL : &data->ioreq_gfn, - (data->flags & XEN_DMOP_no_gfns) ? - NULL : &data->bufioreq_gfn, - &data->bufioreq_port); - break; - } - - case XEN_DMOP_map_io_range_to_ioreq_server: - { - const struct xen_dm_op_ioreq_server_range *data = - &op.u.map_io_range_to_ioreq_server; - - rc = -EINVAL; - if ( data->pad ) - break; - - rc = hvm_map_io_range_to_ioreq_server(d, data->id, data->type, - data->start, data->end); - break; - } - - case XEN_DMOP_unmap_io_range_from_ioreq_server: - { - const struct xen_dm_op_ioreq_server_range *data = - &op.u.unmap_io_range_from_ioreq_server; - - rc = -EINVAL; - if ( data->pad ) - break; - - rc = hvm_unmap_io_range_from_ioreq_server(d, data->id, data->type, - data->start, data->end); - break; - } - case XEN_DMOP_map_mem_type_to_ioreq_server: { struct xen_dm_op_map_mem_type_to_ioreq_server *data = @@ -523,32 +452,6 @@ static int dm_op(const struct dmop_args *op_args) break; } - case XEN_DMOP_set_ioreq_server_state: - { - const struct xen_dm_op_set_ioreq_server_state *data = - &op.u.set_ioreq_server_state; - - rc = -EINVAL; - if ( data->pad ) - break; - - rc = hvm_set_ioreq_server_state(d, data->id, !!data->enabled); - break; - } - - case XEN_DMOP_destroy_ioreq_server: - { - const struct xen_dm_op_destroy_ioreq_server *data = - &op.u.destroy_ioreq_server; - - rc = -EINVAL; - if ( data->pad ) - break; - - rc = hvm_destroy_ioreq_server(d, data->id); - break; - } - case XEN_DMOP_track_dirty_vram: { const struct xen_dm_op_track_dirty_vram *data = @@ -703,7 +606,7 @@ static int dm_op(const struct dmop_args *op_args) } default: - rc = -EOPNOTSUPP; + rc = ioreq_server_dm_op(&op, d, &const_op); break; } diff --git a/xen/common/ioreq.c b/xen/common/ioreq.c index a319c88..72b5da0 100644 --- a/xen/common/ioreq.c +++ b/xen/common/ioreq.c @@ -591,8 +591,8 @@ static void hvm_ioreq_server_deinit(struct ioreq_server *s) put_domain(s->emulator); } -int hvm_create_ioreq_server(struct domain *d, int bufioreq_handling, - ioservid_t *id) +static int hvm_create_ioreq_server(struct domain *d, int bufioreq_handling, + ioservid_t *id) { struct ioreq_server *s; unsigned int i; @@ -647,7 +647,7 @@ int hvm_create_ioreq_server(struct domain *d, int bufioreq_handling, return rc; } -int hvm_destroy_ioreq_server(struct domain *d, ioservid_t id) +static int hvm_destroy_ioreq_server(struct domain *d, ioservid_t id) { struct ioreq_server *s; int rc; @@ -689,10 +689,10 @@ int hvm_destroy_ioreq_server(struct domain *d, ioservid_t id) return rc; } -int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id, - unsigned long *ioreq_gfn, - unsigned long *bufioreq_gfn, - evtchn_port_t *bufioreq_port) +static int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id, + unsigned long *ioreq_gfn, + unsigned long *bufioreq_gfn, + evtchn_port_t *bufioreq_port) { struct ioreq_server *s; int rc; @@ -787,9 +787,9 @@ int hvm_get_ioreq_server_frame(struct domain *d, ioservid_t id, return rc; } -int hvm_map_io_range_to_ioreq_server(struct domain *d, ioservid_t id, - uint32_t type, uint64_t start, - uint64_t end) +static int hvm_map_io_range_to_ioreq_server(struct domain *d, ioservid_t id, + uint32_t type, uint64_t start, + uint64_t end) { struct ioreq_server *s; struct rangeset *r; @@ -839,9 +839,9 @@ int hvm_map_io_range_to_ioreq_server(struct domain *d, ioservid_t id, return rc; } -int hvm_unmap_io_range_from_ioreq_server(struct domain *d, ioservid_t id, - uint32_t type, uint64_t start, - uint64_t end) +static int hvm_unmap_io_range_from_ioreq_server(struct domain *d, ioservid_t id, + uint32_t type, uint64_t start, + uint64_t end) { struct ioreq_server *s; struct rangeset *r; @@ -934,8 +934,8 @@ int hvm_map_mem_type_to_ioreq_server(struct domain *d, ioservid_t id, return rc; } -int hvm_set_ioreq_server_state(struct domain *d, ioservid_t id, - bool enabled) +static int hvm_set_ioreq_server_state(struct domain *d, ioservid_t id, + bool enabled) { struct ioreq_server *s; int rc; @@ -1279,6 +1279,111 @@ void hvm_ioreq_init(struct domain *d) arch_ioreq_domain_init(d); } +int ioreq_server_dm_op(struct xen_dm_op *op, struct domain *d, bool *const_op) +{ + long rc; + + switch ( op->op ) + { + case XEN_DMOP_create_ioreq_server: + { + struct xen_dm_op_create_ioreq_server *data = + &op->u.create_ioreq_server; + + *const_op = false; + + rc = -EINVAL; + if ( data->pad[0] || data->pad[1] || data->pad[2] ) + break; + + rc = hvm_create_ioreq_server(d, data->handle_bufioreq, + &data->id); + break; + } + + case XEN_DMOP_get_ioreq_server_info: + { + struct xen_dm_op_get_ioreq_server_info *data = + &op->u.get_ioreq_server_info; + const uint16_t valid_flags = XEN_DMOP_no_gfns; + + *const_op = false; + + rc = -EINVAL; + if ( data->flags & ~valid_flags ) + break; + + rc = hvm_get_ioreq_server_info(d, data->id, + (data->flags & XEN_DMOP_no_gfns) ? + NULL : (unsigned long *)&data->ioreq_gfn, + (data->flags & XEN_DMOP_no_gfns) ? + NULL : (unsigned long *)&data->bufioreq_gfn, + &data->bufioreq_port); + break; + } + + case XEN_DMOP_map_io_range_to_ioreq_server: + { + const struct xen_dm_op_ioreq_server_range *data = + &op->u.map_io_range_to_ioreq_server; + + rc = -EINVAL; + if ( data->pad ) + break; + + rc = hvm_map_io_range_to_ioreq_server(d, data->id, data->type, + data->start, data->end); + break; + } + + case XEN_DMOP_unmap_io_range_from_ioreq_server: + { + const struct xen_dm_op_ioreq_server_range *data = + &op->u.unmap_io_range_from_ioreq_server; + + rc = -EINVAL; + if ( data->pad ) + break; + + rc = hvm_unmap_io_range_from_ioreq_server(d, data->id, data->type, + data->start, data->end); + break; + } + + case XEN_DMOP_set_ioreq_server_state: + { + const struct xen_dm_op_set_ioreq_server_state *data = + &op->u.set_ioreq_server_state; + + rc = -EINVAL; + if ( data->pad ) + break; + + rc = hvm_set_ioreq_server_state(d, data->id, !!data->enabled); + break; + } + + case XEN_DMOP_destroy_ioreq_server: + { + const struct xen_dm_op_destroy_ioreq_server *data = + &op->u.destroy_ioreq_server; + + rc = -EINVAL; + if ( data->pad ) + break; + + rc = hvm_destroy_ioreq_server(d, data->id); + break; + } + + default: + rc = -EOPNOTSUPP; + break; + } + + return rc; +} + /* * Local variables: * mode: C diff --git a/xen/include/xen/dm.h b/xen/include/xen/dm.h new file mode 100644 index 0000000..2c9952d --- /dev/null +++ b/xen/include/xen/dm.h @@ -0,0 +1,39 @@ +/* + * Copyright (c) 2016 Citrix Systems Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; If not, see . + */ + +#ifndef __XEN_DM_H__ +#define __XEN_DM_H__ + +#include + +struct dmop_args { + domid_t domid; + unsigned int nr_bufs; + /* Reserve enough buf elements for all current hypercalls. */ + struct xen_dm_op_buf buf[2]; +}; + +#endif /* __XEN_DM_H__ */ + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * tab-width: 4 + * indent-tabs-mode: nil + * End: + */ diff --git a/xen/include/xen/ioreq.h b/xen/include/xen/ioreq.h index bc79c37..7a90873 100644 --- a/xen/include/xen/ioreq.h +++ b/xen/include/xen/ioreq.h @@ -85,25 +85,10 @@ bool hvm_io_pending(struct vcpu *v); bool handle_hvm_io_completion(struct vcpu *v); bool is_ioreq_server_page(struct domain *d, const struct page_info *page); -int hvm_create_ioreq_server(struct domain *d, int bufioreq_handling, - ioservid_t *id); -int hvm_destroy_ioreq_server(struct domain *d, ioservid_t id); -int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id, - unsigned long *ioreq_gfn, - unsigned long *bufioreq_gfn, - evtchn_port_t *bufioreq_port); int hvm_get_ioreq_server_frame(struct domain *d, ioservid_t id, unsigned long idx, mfn_t *mfn); -int hvm_map_io_range_to_ioreq_server(struct domain *d, ioservid_t id, - uint32_t type, uint64_t start, - uint64_t end); -int hvm_unmap_io_range_from_ioreq_server(struct domain *d, ioservid_t id, - uint32_t type, uint64_t start, - uint64_t end); int hvm_map_mem_type_to_ioreq_server(struct domain *d, ioservid_t id, uint32_t type, uint32_t flags); -int hvm_set_ioreq_server_state(struct domain *d, ioservid_t id, - bool enabled); int hvm_all_ioreq_servers_add_vcpu(struct domain *d, struct vcpu *v); void hvm_all_ioreq_servers_remove_vcpu(struct domain *d, struct vcpu *v); @@ -117,6 +102,8 @@ unsigned int hvm_broadcast_ioreq(ioreq_t *p, bool buffered); void hvm_ioreq_init(struct domain *d); +int ioreq_server_dm_op(struct xen_dm_op *op, struct domain *d, bool *const_op); + bool arch_ioreq_complete_mmio(void); bool arch_vcpu_ioreq_completion(enum hvm_io_completion io_completion); int arch_ioreq_server_map_pages(struct ioreq_server *s); diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h index 7ae3c40..5c61d8e 100644 --- a/xen/include/xsm/dummy.h +++ b/xen/include/xsm/dummy.h @@ -707,14 +707,14 @@ static XSM_INLINE int xsm_pmu_op (XSM_DEFAULT_ARG struct domain *d, unsigned int } } +#endif /* CONFIG_X86 */ + static XSM_INLINE int xsm_dm_op(XSM_DEFAULT_ARG struct domain *d) { XSM_ASSERT_ACTION(XSM_DM_PRIV); return xsm_default_action(action, current->domain, d); } -#endif /* CONFIG_X86 */ - #ifdef CONFIG_ARGO static XSM_INLINE int xsm_argo_enable(const struct domain *d) { diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h index 7bd03d8..91ecff4 100644 --- a/xen/include/xsm/xsm.h +++ b/xen/include/xsm/xsm.h @@ -176,8 +176,8 @@ struct xsm_operations { int (*ioport_permission) (struct domain *d, uint32_t s, uint32_t e, uint8_t allow); int (*ioport_mapping) (struct domain *d, uint32_t s, uint32_t e, uint8_t allow); int (*pmu_op) (struct domain *d, unsigned int op); - int (*dm_op) (struct domain *d); #endif + int (*dm_op) (struct domain *d); int (*xen_version) (uint32_t cmd); int (*domain_resource_map) (struct domain *d); #ifdef CONFIG_ARGO @@ -682,13 +682,13 @@ static inline int xsm_pmu_op (xsm_default_t def, struct domain *d, unsigned int return xsm_ops->pmu_op(d, op); } +#endif /* CONFIG_X86 */ + static inline int xsm_dm_op(xsm_default_t def, struct domain *d) { return xsm_ops->dm_op(d); } -#endif /* CONFIG_X86 */ - static inline int xsm_xen_version (xsm_default_t def, uint32_t op) { return xsm_ops->xen_version(op); diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c index 9e09512..8bdffe7 100644 --- a/xen/xsm/dummy.c +++ b/xen/xsm/dummy.c @@ -147,8 +147,8 @@ void __init xsm_fixup_ops (struct xsm_operations *ops) set_to_dummy_if_null(ops, ioport_permission); set_to_dummy_if_null(ops, ioport_mapping); set_to_dummy_if_null(ops, pmu_op); - set_to_dummy_if_null(ops, dm_op); #endif + set_to_dummy_if_null(ops, dm_op); set_to_dummy_if_null(ops, xen_version); set_to_dummy_if_null(ops, domain_resource_map); #ifdef CONFIG_ARGO diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c index 19b0d9e..11784d7 100644 --- a/xen/xsm/flask/hooks.c +++ b/xen/xsm/flask/hooks.c @@ -1656,14 +1656,13 @@ static int flask_pmu_op (struct domain *d, unsigned int op) return -EPERM; } } +#endif /* CONFIG_X86 */ static int flask_dm_op(struct domain *d) { return current_has_perm(d, SECCLASS_HVM, HVM__DM); } -#endif /* CONFIG_X86 */ - static int flask_xen_version (uint32_t op) { u32 dsid = domain_sid(current->domain); @@ -1865,8 +1864,8 @@ static struct xsm_operations flask_ops = { .ioport_permission = flask_ioport_permission, .ioport_mapping = flask_ioport_mapping, .pmu_op = flask_pmu_op, - .dm_op = flask_dm_op, #endif + .dm_op = flask_dm_op, .xen_version = flask_xen_version, .domain_resource_map = flask_domain_resource_map, #ifdef CONFIG_ARGO