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Also remove the bogus copy_domain_page(): should be placed before the call to map_vcpu_info(), as the later can update the contents of the vcpu_info page. Note that this eliminates a bug in copy_vcpu_settings(): The function did allocate a new page regardless of the GFN already having a mapping, thus in particular breaking the case of two vCPU-s having their info areas on the s= ame page. Fixes: 41548c5472a3 ('mem_sharing: VM forking') Signed-off-by: Roger Pau Monn=C3=A9 Acked-by/Reviewed-by from Tamas (or at least not present in my inbox). Acked-by: Tamas K Lengyel --- Only build tested. --- Changes since v4: - New in this version. --- xen/arch/x86/mm/mem_sharing.c | 36 ++++++----------------------------- 1 file changed, 6 insertions(+), 30 deletions(-) diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c index ae5366d4476e..5f8f1fb4d871 100644 --- a/xen/arch/x86/mm/mem_sharing.c +++ b/xen/arch/x86/mm/mem_sharing.c @@ -1689,48 +1689,24 @@ static int copy_vcpu_settings(struct domain *cd, co= nst struct domain *d) unsigned int i; struct p2m_domain *p2m =3D p2m_get_hostp2m(cd); int ret =3D -EINVAL; + mfn_t vcpu_info_mfn; =20 for ( i =3D 0; i < cd->max_vcpus; i++ ) { struct vcpu *d_vcpu =3D d->vcpu[i]; struct vcpu *cd_vcpu =3D cd->vcpu[i]; - mfn_t vcpu_info_mfn; =20 if ( !d_vcpu || !cd_vcpu ) continue; =20 - /* Copy & map in the vcpu_info page if the guest uses one */ + /* Map in the vcpu_info page if the guest uses one */ vcpu_info_mfn =3D d_vcpu->vcpu_info_mfn; if ( !mfn_eq(vcpu_info_mfn, INVALID_MFN) ) { - mfn_t new_vcpu_info_mfn =3D cd_vcpu->vcpu_info_mfn; - - /* Allocate & map the page for it if it hasn't been already */ - if ( mfn_eq(new_vcpu_info_mfn, INVALID_MFN) ) - { - gfn_t gfn =3D mfn_to_gfn(d, vcpu_info_mfn); - unsigned long gfn_l =3D gfn_x(gfn); - struct page_info *page; - - if ( !(page =3D alloc_domheap_page(cd, 0)) ) - return -ENOMEM; - - new_vcpu_info_mfn =3D page_to_mfn(page); - set_gpfn_from_mfn(mfn_x(new_vcpu_info_mfn), gfn_l); - - ret =3D p2m->set_entry(p2m, gfn, new_vcpu_info_mfn, - PAGE_ORDER_4K, p2m_ram_rw, - p2m->default_access, -1); - if ( ret ) - return ret; - - ret =3D map_vcpu_info(cd_vcpu, gfn_l, - PAGE_OFFSET(d_vcpu->vcpu_info)); - if ( ret ) - return ret; - } - - copy_domain_page(new_vcpu_info_mfn, vcpu_info_mfn); + ret =3D map_vcpu_info(cd_vcpu, mfn_to_gfn(d, vcpu_info_mfn), + PAGE_OFFSET(d_vcpu->vcpu_info)); + if ( ret ) + return ret; } =20 ret =3D copy_vpmu(d_vcpu, cd_vcpu); --=20 2.42.0 From nobody Tue May 14 17:29:13 2024 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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Signed-off-by: Jan Beulich Acked-by: Roger Pau Monn=C3=A9 --- xen/arch/x86/pv/shim.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c index ca0e639db323..7e4bacf7ae40 100644 --- a/xen/arch/x86/pv/shim.c +++ b/xen/arch/x86/pv/shim.c @@ -385,6 +385,10 @@ int pv_shim_shutdown(uint8_t reason) /* Unmap guest vcpu_info pages. */ unmap_vcpu_info(v); =20 + /* Zap runstate and time area handles. */ + set_xen_guest_handle(runstate_guest(v), NULL); + set_xen_guest_handle(v->arch.time_info_guest, NULL); + /* Reset the periodic timer to the default value. */ vcpu_set_periodic_timer(v, MILLISECS(10)); /* Stop the singleshot timer. */ --=20 2.42.0 From nobody Tue May 14 17:29:13 2024 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; 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Signed-off-by: Jan Beulich Reviewed-by: Julien Grall Acked-by: Roger Pau Monn=C3=A9 --- xen/arch/x86/domain.c | 5 +++++ xen/arch/x86/include/asm/domain.h | 1 + xen/arch/x86/pv/shim.c | 4 +++- xen/common/domain.c | 17 +++++++++++++++++ xen/include/xen/domain.h | 11 +++++++++++ xen/include/xen/sched.h | 1 + 6 files changed, 38 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c index 645675d87d9d..9d352defa25e 100644 --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -1024,7 +1024,10 @@ int arch_domain_soft_reset(struct domain *d) } =20 for_each_vcpu ( d, v ) + { set_xen_guest_handle(v->arch.time_info_guest, NULL); + unmap_guest_area(v, &v->arch.time_guest_area); + } =20 exit_put_gfn: put_gfn(d, gfn_x(gfn)); @@ -2381,6 +2384,8 @@ int domain_relinquish_resources(struct domain *d) if ( ret ) return ret; =20 + unmap_guest_area(v, &v->arch.time_guest_area); + vpmu_destroy(v); } =20 diff --git a/xen/arch/x86/include/asm/domain.h b/xen/arch/x86/include/asm/d= omain.h index c2d9fc333be5..e0bd28e424e0 100644 --- a/xen/arch/x86/include/asm/domain.h +++ b/xen/arch/x86/include/asm/domain.h @@ -669,6 +669,7 @@ struct arch_vcpu =20 /* A secondary copy of the vcpu time info. */ XEN_GUEST_HANDLE(vcpu_time_info_t) time_info_guest; + struct guest_area time_guest_area; =20 struct arch_vm_event *vm_event; =20 diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c index 7e4bacf7ae40..f08b16bae2fe 100644 --- a/xen/arch/x86/pv/shim.c +++ b/xen/arch/x86/pv/shim.c @@ -382,8 +382,10 @@ int pv_shim_shutdown(uint8_t reason) =20 for_each_vcpu ( d, v ) { - /* Unmap guest vcpu_info pages. */ + /* Unmap guest vcpu_info page and runstate/time areas. */ unmap_vcpu_info(v); + unmap_guest_area(v, &v->runstate_guest_area); + unmap_guest_area(v, &v->arch.time_guest_area); =20 /* Zap runstate and time area handles. */ set_xen_guest_handle(runstate_guest(v), NULL); diff --git a/xen/common/domain.c b/xen/common/domain.c index 304aa04fa6cb..76a4c2072e10 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -992,7 +992,10 @@ int domain_kill(struct domain *d) if ( cpupool_move_domain(d, cpupool0) ) return -ERESTART; for_each_vcpu ( d, v ) + { unmap_vcpu_info(v); + unmap_guest_area(v, &v->runstate_guest_area); + } d->is_dying =3D DOMDYING_dead; /* Mem event cleanup has to go here because the rings=20 * have to be put before we call put_domain. */ @@ -1446,6 +1449,7 @@ int domain_soft_reset(struct domain *d, bool resuming) { set_xen_guest_handle(runstate_guest(v), NULL); unmap_vcpu_info(v); + unmap_guest_area(v, &v->runstate_guest_area); } =20 rc =3D arch_domain_soft_reset(d); @@ -1597,6 +1601,19 @@ void unmap_vcpu_info(struct vcpu *v) put_page_and_type(mfn_to_page(mfn)); } =20 +/* + * This is only intended to be used for domain cleanup (or more generally = only + * with at least the respective vCPU, if it's not the current one, reliably + * paused). + */ +void unmap_guest_area(struct vcpu *v, struct guest_area *area) +{ + struct domain *d =3D v->domain; + + if ( v !=3D current ) + ASSERT(atomic_read(&v->pause_count) | atomic_read(&d->pause_count)= ); +} + int default_initialise_vcpu(struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) a= rg) { struct vcpu_guest_context *ctxt; diff --git a/xen/include/xen/domain.h b/xen/include/xen/domain.h index 81fb05a64275..a6b22fa2cac8 100644 --- a/xen/include/xen/domain.h +++ b/xen/include/xen/domain.h @@ -5,6 +5,12 @@ #include =20 #include + +struct guest_area { + struct page_info *pg; + void *map; +}; + #include #include =20 @@ -77,6 +83,11 @@ void arch_vcpu_destroy(struct vcpu *v); int map_vcpu_info(struct vcpu *v, unsigned long gfn, unsigned int offset); void unmap_vcpu_info(struct vcpu *v); =20 +int map_guest_area(struct vcpu *v, paddr_t gaddr, unsigned int size, + struct guest_area *area, + void (*populate)(void *dst, struct vcpu *v)); +void unmap_guest_area(struct vcpu *v, struct guest_area *area); + struct xen_domctl_createdomain; int arch_domain_create(struct domain *d, struct xen_domctl_createdomain *config, diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index d8c8dd85a67d..f30f3b0ebeab 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -203,6 +203,7 @@ struct vcpu XEN_GUEST_HANDLE(vcpu_runstate_info_compat_t) compat; } runstate_guest; /* guest address */ #endif + struct guest_area runstate_guest_area; unsigned int new_state; =20 /* Has the FPU been initialised? */ --=20 2.42.0 From nobody Tue May 14 17:29:13 2024 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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Note that updating of the area will be done exclusively following the model enabled by VMASST_TYPE_runstate_update_flag for virtual-address based registered areas. Note further that pages aren't marked dirty when written to (matching the handling of space mapped by map_vcpu_info()), on the basis that the registrations are lost anyway across migration (or would need re- populating at the target for transparent migration). Plus the contents of the areas in question have to be deemed volatile in the first place (so saving a "most recent" value is pretty meaningless even for e.g. snapshotting). Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monn=C3=A9 Reviewed-by: Julien Grall --- xen/common/domain.c | 43 ++++++++++++++++++++++++++++++++++++++--- xen/include/xen/sched.h | 2 ++ 2 files changed, 42 insertions(+), 3 deletions(-) diff --git a/xen/common/domain.c b/xen/common/domain.c index 76a4c2072e10..d4958ec5e149 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -1644,15 +1644,52 @@ bool update_runstate_area(struct vcpu *v) bool rc; struct guest_memory_policy policy =3D { }; void __user *guest_handle =3D NULL; - struct vcpu_runstate_info runstate; + struct vcpu_runstate_info runstate =3D v->runstate; + struct vcpu_runstate_info *map =3D v->runstate_guest_area.map; + + if ( map ) + { + uint64_t *pset; +#ifdef CONFIG_COMPAT + struct compat_vcpu_runstate_info *cmap =3D NULL; + + if ( v->runstate_guest_area_compat ) + cmap =3D (void *)map; +#endif + + /* + * NB: No VM_ASSIST(v->domain, runstate_update_flag) check here. + * Always using that updating model. + */ +#ifdef CONFIG_COMPAT + if ( cmap ) + pset =3D &cmap->state_entry_time; + else +#endif + pset =3D &map->state_entry_time; + runstate.state_entry_time |=3D XEN_RUNSTATE_UPDATE; + write_atomic(pset, runstate.state_entry_time); + smp_wmb(); + +#ifdef CONFIG_COMPAT + if ( cmap ) + XLAT_vcpu_runstate_info(cmap, &runstate); + else +#endif + *map =3D runstate; + + smp_wmb(); + runstate.state_entry_time &=3D ~XEN_RUNSTATE_UPDATE; + write_atomic(pset, runstate.state_entry_time); + + return true; + } =20 if ( guest_handle_is_null(runstate_guest(v)) ) return true; =20 update_guest_memory_policy(v, &policy); =20 - memcpy(&runstate, &v->runstate, sizeof(runstate)); - if ( VM_ASSIST(v->domain, runstate_update_flag) ) { #ifdef CONFIG_COMPAT diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index f30f3b0ebeab..6e1028785d8c 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -232,6 +232,8 @@ struct vcpu #ifdef CONFIG_COMPAT /* A hypercall is using the compat ABI? */ bool hcall_compat; + /* Physical runstate area registered via compat ABI? */ + bool runstate_guest_area_compat; 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Note that pages aren't marked dirty when written to (matching the handling of space mapped by map_vcpu_info()), on the basis that the registrations are lost anyway across migration (or would need re- populating at the target for transparent migration). Plus the contents of the areas in question have to be deemed volatile in the first place (so saving a "most recent" value is pretty meaningless even for e.g. snapshotting). Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monn=C3=A9 --- xen/arch/x86/time.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c index af40a9993c81..332d2d79aeae 100644 --- a/xen/arch/x86/time.c +++ b/xen/arch/x86/time.c @@ -1566,12 +1566,34 @@ static void __update_vcpu_system_time(struct vcpu *= v, int force) v->arch.pv.pending_system_time =3D _u; } =20 +static void write_time_guest_area(struct vcpu_time_info *map, + const struct vcpu_time_info *src) +{ + /* 1. Update userspace version. */ + write_atomic(&map->version, src->version); + smp_wmb(); + + /* 2. Update all other userspace fields. */ + *map =3D *src; + + /* 3. Update userspace version again. */ + smp_wmb(); + write_atomic(&map->version, version_update_end(src->version)); +} + bool update_secondary_system_time(struct vcpu *v, struct vcpu_time_info *u) { XEN_GUEST_HANDLE(vcpu_time_info_t) user_u =3D v->arch.time_info_guest; + struct vcpu_time_info *map =3D v->arch.time_guest_area.map; struct guest_memory_policy policy =3D { .nested_guest_mode =3D false }; =20 + if ( map ) + { + write_time_guest_area(map, u); + return true; + } + if ( guest_handle_is_null(user_u) ) return true; =20 --=20 2.42.0 From nobody Tue May 14 17:29:13 2024 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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Signed-off-by: Jan Beulich Signed-off-by: Roger Pau Monn=C3=A9 --- Changes since v4: - Rely on map_guest_area() to populate the child p2m if necessary. --- xen/arch/x86/mm/mem_sharing.c | 31 +++++++++++++++++++++++++++++++ xen/common/domain.c | 7 +++++++ 2 files changed, 38 insertions(+) diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c index 5f8f1fb4d871..99cf001fd70f 100644 --- a/xen/arch/x86/mm/mem_sharing.c +++ b/xen/arch/x86/mm/mem_sharing.c @@ -1641,6 +1641,24 @@ static void copy_vcpu_nonreg_state(struct vcpu *d_vc= pu, struct vcpu *cd_vcpu) hvm_set_nonreg_state(cd_vcpu, &nrs); } =20 +static int copy_guest_area(struct guest_area *cd_area, + const struct guest_area *d_area, + struct vcpu *cd_vcpu, + const struct domain *d) +{ + unsigned int offset; + + /* Check if no area to map, or already mapped. */ + if ( !d_area->pg || cd_area->pg ) + return 0; + + offset =3D PAGE_OFFSET(d_area->map); + return map_guest_area(cd_vcpu, gfn_to_gaddr( + mfn_to_gfn(d, page_to_mfn(d_area->p= g))) + + offset, + PAGE_SIZE - offset, cd_area, NULL); +} + static int copy_vpmu(struct vcpu *d_vcpu, struct vcpu *cd_vcpu) { struct vpmu_struct *d_vpmu =3D vcpu_vpmu(d_vcpu); @@ -1709,6 +1727,16 @@ static int copy_vcpu_settings(struct domain *cd, con= st struct domain *d) return ret; } =20 + /* Same for the (physically registered) runstate and time info are= as. */ + ret =3D copy_guest_area(&cd_vcpu->runstate_guest_area, + &d_vcpu->runstate_guest_area, cd_vcpu, d); + if ( ret ) + return ret; + ret =3D copy_guest_area(&cd_vcpu->arch.time_guest_area, + &d_vcpu->arch.time_guest_area, cd_vcpu, d); + if ( ret ) + return ret; + ret =3D copy_vpmu(d_vcpu, cd_vcpu); if ( ret ) return ret; @@ -1950,7 +1978,10 @@ int mem_sharing_fork_reset(struct domain *d, bool re= set_state, =20 state: if ( reset_state ) + { rc =3D copy_settings(d, pd); + /* TBD: What to do here with -ERESTART? */ + } =20 domain_unpause(d); =20 diff --git a/xen/common/domain.c b/xen/common/domain.c index d4958ec5e149..47fc90271901 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -1601,6 +1601,13 @@ void unmap_vcpu_info(struct vcpu *v) put_page_and_type(mfn_to_page(mfn)); } =20 +int map_guest_area(struct vcpu *v, paddr_t gaddr, unsigned int size, + struct guest_area *area, + void (*populate)(void *dst, struct vcpu *v)) +{ + return -EOPNOTSUPP; +} + /* * This is only intended to be used for domain cleanup (or more generally = only * with at least the respective vCPU, if it's not the current one, reliably --=20 2.42.0 From nobody Tue May 14 17:29:13 2024 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; arc=pass (i=1 dmarc=pass fromdomain=citrix.com); dmarc=pass(p=reject dis=none) header.from=citrix.com ARC-Seal: i=2; a=rsa-sha256; t=1696260288; cv=pass; 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Furthermore for 64-bit PV domains the areas are inaccessible (and hence cannot be updated by Xen) when in guest-user mode, and for HVM guests they may be inaccessible when Meltdown mitigations are in place. (There are yet more issues.) In preparation of the introduction of new vCPU operations allowing to register the respective areas (one of the two is x86-specific) by guest-physical address, flesh out the map/unmap functions. Noteworthy differences from map_vcpu_info(): - areas can be registered more than once (and de-registered), - remote vCPU-s are paused rather than checked for being down (which in principle can change right after the check), - the domain lock is taken for a much smaller region. Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monn=C3=A9 Reviewed-by: Julien Grall --- xen/common/domain.c | 92 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 91 insertions(+), 1 deletion(-) diff --git a/xen/common/domain.c b/xen/common/domain.c index 47fc90271901..747bf5c87a8d 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -1605,7 +1605,82 @@ int map_guest_area(struct vcpu *v, paddr_t gaddr, un= signed int size, struct guest_area *area, void (*populate)(void *dst, struct vcpu *v)) { - return -EOPNOTSUPP; + struct domain *d =3D v->domain; + void *map =3D NULL; + struct page_info *pg =3D NULL; + int rc =3D 0; + + if ( ~gaddr ) /* Map (i.e. not just unmap)? */ + { + unsigned long gfn =3D PFN_DOWN(gaddr); + unsigned int align; + p2m_type_t p2mt; + + if ( gfn !=3D PFN_DOWN(gaddr + size - 1) ) + return -ENXIO; + +#ifdef CONFIG_COMPAT + if ( has_32bit_shinfo(d) ) + align =3D alignof(compat_ulong_t); + else +#endif + align =3D alignof(xen_ulong_t); + if ( !IS_ALIGNED(gaddr, align) ) + return -ENXIO; + + rc =3D check_get_page_from_gfn(d, _gfn(gfn), false, &p2mt, &pg); + if ( rc ) + return rc; + + if ( !get_page_type(pg, PGT_writable_page) ) + { + put_page(pg); + return -EACCES; + } + + map =3D __map_domain_page_global(pg); + if ( !map ) + { + put_page_and_type(pg); + return -ENOMEM; + } + map +=3D PAGE_OFFSET(gaddr); + } + + if ( v !=3D current ) + { + if ( !spin_trylock(&d->hypercall_deadlock_mutex) ) + { + rc =3D -ERESTART; + goto unmap; + } + + vcpu_pause(v); + + spin_unlock(&d->hypercall_deadlock_mutex); + } + + domain_lock(d); + + if ( map && populate ) + populate(map, v); + + SWAP(area->pg, pg); + SWAP(area->map, map); + + domain_unlock(d); + + if ( v !=3D current ) + vcpu_unpause(v); + + unmap: + if ( pg ) + { + unmap_domain_page_global(map); + put_page_and_type(pg); + } + + return rc; } =20 /* @@ -1616,9 +1691,24 @@ int map_guest_area(struct vcpu *v, paddr_t gaddr, un= signed int size, void unmap_guest_area(struct vcpu *v, struct guest_area *area) { struct domain *d =3D v->domain; + void *map; + struct page_info *pg; =20 if ( v !=3D current ) ASSERT(atomic_read(&v->pause_count) | atomic_read(&d->pause_count)= ); + + domain_lock(d); + map =3D area->map; + area->map =3D NULL; + pg =3D area->pg; + area->pg =3D NULL; + domain_unlock(d); + + if ( pg ) + { + unmap_domain_page_global(map); + put_page_and_type(pg); + } } =20 int default_initialise_vcpu(struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) a= rg) --=20 2.42.0 From nobody Tue May 14 17:29:13 2024 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; arc=pass (i=1 dmarc=pass fromdomain=citrix.com); dmarc=pass(p=reject dis=none) header.from=citrix.com ARC-Seal: i=2; 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Furthermore for 64-bit PV domains the area is inaccessible (and hence cannot be updated by Xen) when in guest-user mode. Introduce a new vCPU operation allowing to register the runstate area by guest-physical address. An at least theoretical downside to using physically registered areas is that PV then won't see dirty (and perhaps also accessed) bits set in its respective page table entries. Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monn=C3=A9 Acked-by: Julien Grall --- xen/arch/x86/x86_64/domain.c | 35 ++++++++++++++++++++++++++++++++ xen/common/domain.c | 39 ++++++++++++++++++++++++++++++++++++ xen/include/public/vcpu.h | 15 ++++++++++++++ 3 files changed, 89 insertions(+) diff --git a/xen/arch/x86/x86_64/domain.c b/xen/arch/x86/x86_64/domain.c index bfaea17fe718..494b0b54e64e 100644 --- a/xen/arch/x86/x86_64/domain.c +++ b/xen/arch/x86/x86_64/domain.c @@ -12,6 +12,22 @@ CHECK_vcpu_get_physid; #undef xen_vcpu_get_physid =20 +static void cf_check +runstate_area_populate(void *map, struct vcpu *v) +{ + if ( is_pv_vcpu(v) ) + v->arch.pv.need_update_runstate_area =3D false; + + v->runstate_guest_area_compat =3D true; + + if ( v =3D=3D current ) + { + struct compat_vcpu_runstate_info *info =3D map; + + XLAT_vcpu_runstate_info(info, &v->runstate); + } +} + int compat_vcpu_op(int cmd, unsigned int vcpuid, XEN_GUEST_HANDLE_PARAM(void) = arg) { @@ -58,6 +74,25 @@ compat_vcpu_op(int cmd, unsigned int vcpuid, XEN_GUEST_H= ANDLE_PARAM(void) arg) break; } =20 + case VCPUOP_register_runstate_phys_area: + { + struct compat_vcpu_register_runstate_memory_area area; + + rc =3D -EFAULT; + if ( copy_from_guest(&area.addr.p, arg, 1) ) + break; + + rc =3D map_guest_area(v, area.addr.p, + sizeof(struct compat_vcpu_runstate_info), + &v->runstate_guest_area, + runstate_area_populate); + if ( rc =3D=3D -ERESTART ) + rc =3D hypercall_create_continuation(__HYPERVISOR_vcpu_op, "ii= h", + cmd, vcpuid, arg); + + break; + } + case VCPUOP_register_vcpu_time_memory_area: { struct compat_vcpu_register_time_memory_area area =3D { .addr.p = =3D 0 }; diff --git a/xen/common/domain.c b/xen/common/domain.c index 747bf5c87a8d..486c1ae3f7f3 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -1830,6 +1830,26 @@ bool update_runstate_area(struct vcpu *v) return rc; } =20 +static void cf_check +runstate_area_populate(void *map, struct vcpu *v) +{ +#ifdef CONFIG_PV + if ( is_pv_vcpu(v) ) + v->arch.pv.need_update_runstate_area =3D false; +#endif + +#ifdef CONFIG_COMPAT + v->runstate_guest_area_compat =3D false; +#endif + + if ( v =3D=3D current ) + { + struct vcpu_runstate_info *info =3D map; + + *info =3D v->runstate; + } +} + long common_vcpu_op(int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) = arg) { long rc =3D 0; @@ -2012,6 +2032,25 @@ long common_vcpu_op(int cmd, struct vcpu *v, XEN_GUE= ST_HANDLE_PARAM(void) arg) break; } =20 + case VCPUOP_register_runstate_phys_area: + { + struct vcpu_register_runstate_memory_area area; + + rc =3D -EFAULT; + if ( copy_from_guest(&area.addr.p, arg, 1) ) + break; + + rc =3D map_guest_area(v, area.addr.p, + sizeof(struct vcpu_runstate_info), + &v->runstate_guest_area, + runstate_area_populate); + if ( rc =3D=3D -ERESTART ) + rc =3D hypercall_create_continuation(__HYPERVISOR_vcpu_op, "ii= h", + cmd, vcpuid, arg); + + break; + } + default: rc =3D -ENOSYS; break; diff --git a/xen/include/public/vcpu.h b/xen/include/public/vcpu.h index a836b264a911..9dac0f9748ca 100644 --- a/xen/include/public/vcpu.h +++ b/xen/include/public/vcpu.h @@ -110,6 +110,8 @@ DEFINE_XEN_GUEST_HANDLE(vcpu_runstate_info_t); * runstate.state will always be RUNSTATE_running and * runstate.state_entry_time will indicate the system time at which the * VCPU was last scheduled to run. + * 3. New code wants to prefer VCPUOP_register_runstate_phys_area, and on= ly + * fall back to the operation here for backwards compatibility. * @extra_arg =3D=3D pointer to vcpu_register_runstate_memory_area structu= re. */ #define VCPUOP_register_runstate_memory_area 5 @@ -221,6 +223,19 @@ struct vcpu_register_time_memory_area { typedef struct vcpu_register_time_memory_area vcpu_register_time_memory_ar= ea_t; DEFINE_XEN_GUEST_HANDLE(vcpu_register_time_memory_area_t); =20 +/* + * Like the respective VCPUOP_register_*_memory_area, just using the "addr= .p" + * field of the supplied struct as a guest physical address (i.e. in GFN s= pace). + * The respective area may not cross a page boundary. Pass ~0 to unregist= er an + * area. Note that as long as an area is registered by physical address, = the + * linear address based area will not be serviced (updated) by the hypervi= sor. + * + * Note that the area registered via VCPUOP_register_runstate_memory_area = will + * be updated in the same manner as the one registered via virtual address= PLUS + * VMASST_TYPE_runstate_update_flag engaged by the domain. + */ +#define VCPUOP_register_runstate_phys_area 14 + #endif /* __XEN_PUBLIC_VCPU_H__ */ =20 /* --=20 2.42.0 From nobody Tue May 14 17:29:13 2024 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; arc=pass (i=1 dmarc=pass fromdomain=citrix.com); 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Furthermore for 64-bit PV domains the area is inaccessible (and hence cannot be updated by Xen) when in guest-user mode. Introduce a new vCPU operation allowing to register the secondary time area by guest-physical address. An at least theoretical downside to using physically registered areas is that PV then won't see dirty (and perhaps also accessed) bits set in its respective page table entries. Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monn=C3=A9 Acked-by: Julien Grall --- xen/arch/x86/domain.c | 28 ++++++++++++++++++++++++++++ xen/arch/x86/include/asm/domain.h | 2 ++ xen/arch/x86/time.c | 10 ++++++++++ xen/arch/x86/x86_64/domain.c | 1 + xen/include/public/vcpu.h | 4 ++++ 5 files changed, 45 insertions(+) diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c index 9d352defa25e..8e0af2278104 100644 --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -1529,6 +1529,15 @@ int arch_vcpu_reset(struct vcpu *v) return 0; } =20 +static void cf_check +time_area_populate(void *map, struct vcpu *v) +{ + if ( is_pv_vcpu(v) ) + v->arch.pv.pending_system_time.version =3D 0; + + force_update_secondary_system_time(v, map); +} + long do_vcpu_op(int cmd, unsigned int vcpuid, XEN_GUEST_HANDLE_PARAM(void)= arg) { long rc =3D 0; @@ -1567,6 +1576,25 @@ long do_vcpu_op(int cmd, unsigned int vcpuid, XEN_GU= EST_HANDLE_PARAM(void) arg) break; } =20 + case VCPUOP_register_vcpu_time_phys_area: + { + struct vcpu_register_time_memory_area area; + + rc =3D -EFAULT; + if ( copy_from_guest(&area.addr.p, arg, 1) ) + break; + + rc =3D map_guest_area(v, area.addr.p, + sizeof(vcpu_time_info_t), + &v->arch.time_guest_area, + time_area_populate); + if ( rc =3D=3D -ERESTART ) + rc =3D hypercall_create_continuation(__HYPERVISOR_vcpu_op, "ii= h", + cmd, vcpuid, arg); + + break; + } + case VCPUOP_get_physid: { struct vcpu_get_physid cpu_id; diff --git a/xen/arch/x86/include/asm/domain.h b/xen/arch/x86/include/asm/d= omain.h index e0bd28e424e0..619e667938ed 100644 --- a/xen/arch/x86/include/asm/domain.h +++ b/xen/arch/x86/include/asm/domain.h @@ -692,6 +692,8 @@ void domain_cpu_policy_changed(struct domain *d); =20 bool update_secondary_system_time(struct vcpu *, struct vcpu_time_info *); +void force_update_secondary_system_time(struct vcpu *, + struct vcpu_time_info *); =20 void vcpu_show_registers(const struct vcpu *); =20 diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c index 332d2d79aeae..73df1639a301 100644 --- a/xen/arch/x86/time.c +++ b/xen/arch/x86/time.c @@ -1628,6 +1628,16 @@ void force_update_vcpu_system_time(struct vcpu *v) __update_vcpu_system_time(v, 1); } =20 +void force_update_secondary_system_time(struct vcpu *v, + struct vcpu_time_info *map) +{ + struct vcpu_time_info u; + + collect_time_info(v, &u); + u.version =3D -1; /* Compensate for version_update_end(). */ + write_time_guest_area(map, &u); +} + static void update_domain_rtc(void) { struct domain *d; diff --git a/xen/arch/x86/x86_64/domain.c b/xen/arch/x86/x86_64/domain.c index 494b0b54e64e..a02d4f569ee5 100644 --- a/xen/arch/x86/x86_64/domain.c +++ b/xen/arch/x86/x86_64/domain.c @@ -115,6 +115,7 @@ compat_vcpu_op(int cmd, unsigned int vcpuid, XEN_GUEST_= HANDLE_PARAM(void) arg) =20 case VCPUOP_send_nmi: case VCPUOP_get_physid: + case VCPUOP_register_vcpu_time_phys_area: rc =3D do_vcpu_op(cmd, vcpuid, arg); break; =20 diff --git a/xen/include/public/vcpu.h b/xen/include/public/vcpu.h index 9dac0f9748ca..8fb0bd1b6c03 100644 --- a/xen/include/public/vcpu.h +++ b/xen/include/public/vcpu.h @@ -209,6 +209,9 @@ DEFINE_XEN_GUEST_HANDLE(vcpu_get_physid_t); * segment limit). It can then apply the normal algorithm to compute * system time from the tsc. * + * New code wants to prefer VCPUOP_register_vcpu_time_phys_area, and only + * fall back to the operation here for backwards compatibility. + * * @extra_arg =3D=3D pointer to vcpu_register_time_info_memory_area struct= ure. */ #define VCPUOP_register_vcpu_time_memory_area 13 @@ -235,6 +238,7 @@ DEFINE_XEN_GUEST_HANDLE(vcpu_register_time_memory_area_= t); * VMASST_TYPE_runstate_update_flag engaged by the domain. */ #define VCPUOP_register_runstate_phys_area 14 +#define VCPUOP_register_vcpu_time_phys_area 15 =20 #endif /* __XEN_PUBLIC_VCPU_H__ */ =20 --=20 2.42.0 From nobody Tue May 14 17:29:13 2024 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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Noteworthy differences from map_vcpu_info(): - remote vCPU-s are paused rather than checked for being down (which in principle can change right after the check), - the domain lock is taken for a much smaller region, - the error code for an attempt to re-register the area is now -EBUSY, - we could in principle permit de-registration when no area was previously registered (which would permit "probing", if necessary for anything). Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monn=C3=A9 Acked-by: Julien Grall --- xen/arch/x86/include/asm/shared.h | 19 ++- xen/arch/x86/mm/mem_sharing.c | 20 ++- xen/arch/x86/pv/shim.c | 2 +- xen/arch/x86/time.c | 2 +- xen/arch/x86/x86_64/asm-offsets.c | 2 +- xen/arch/x86/x86_64/traps.c | 2 +- xen/common/compat/domain.c | 2 +- xen/common/domain.c | 204 ++++++++++++------------------ xen/include/xen/domain.h | 3 - xen/include/xen/sched.h | 5 +- xen/include/xen/shared.h | 3 +- 11 files changed, 112 insertions(+), 152 deletions(-) diff --git a/xen/arch/x86/include/asm/shared.h b/xen/arch/x86/include/asm/s= hared.h index dd3ae8c2639d..60b67fa4b427 100644 --- a/xen/arch/x86/include/asm/shared.h +++ b/xen/arch/x86/include/asm/shared.h @@ -26,17 +26,20 @@ static inline void arch_set_##field(struct domain *d, = \ #define GET_SET_VCPU(type, field) \ static inline type arch_get_##field(const struct vcpu *v) \ { \ + const vcpu_info_t *vi =3D v->vcpu_info_area.map; \ + \ return !has_32bit_shinfo(v->domain) ? \ - v->vcpu_info->native.arch.field : \ - v->vcpu_info->compat.arch.field; \ + vi->native.arch.field : vi->compat.arch.field; \ } \ static inline void arch_set_##field(struct vcpu *v, \ type val) \ { \ + vcpu_info_t *vi =3D v->vcpu_info_area.map; \ + \ if ( !has_32bit_shinfo(v->domain) ) \ - v->vcpu_info->native.arch.field =3D val; \ + vi->native.arch.field =3D val; \ else \ - v->vcpu_info->compat.arch.field =3D val; \ + vi->compat.arch.field =3D val; \ } =20 #else @@ -57,12 +60,16 @@ static inline void arch_set_##field(struct domain *d, = \ #define GET_SET_VCPU(type, field) \ static inline type arch_get_##field(const struct vcpu *v) \ { \ - return v->vcpu_info->arch.field; \ + const vcpu_info_t *vi =3D v->vcpu_info_area.map; \ + \ + return vi->arch.field; \ } \ static inline void arch_set_##field(struct vcpu *v, \ type val) \ { \ - v->vcpu_info->arch.field =3D val; \ + vcpu_info_t *vi =3D v->vcpu_info_area.map; \ + \ + vi->arch.field =3D val; \ } =20 #endif diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c index 99cf001fd70f..6f1ce1623b8d 100644 --- a/xen/arch/x86/mm/mem_sharing.c +++ b/xen/arch/x86/mm/mem_sharing.c @@ -1705,7 +1705,6 @@ static int copy_vpmu(struct vcpu *d_vcpu, struct vcpu= *cd_vcpu) static int copy_vcpu_settings(struct domain *cd, const struct domain *d) { unsigned int i; - struct p2m_domain *p2m =3D p2m_get_hostp2m(cd); int ret =3D -EINVAL; mfn_t vcpu_info_mfn; =20 @@ -1717,17 +1716,14 @@ static int copy_vcpu_settings(struct domain *cd, co= nst struct domain *d) if ( !d_vcpu || !cd_vcpu ) continue; =20 - /* Map in the vcpu_info page if the guest uses one */ - vcpu_info_mfn =3D d_vcpu->vcpu_info_mfn; - if ( !mfn_eq(vcpu_info_mfn, INVALID_MFN) ) - { - ret =3D map_vcpu_info(cd_vcpu, mfn_to_gfn(d, vcpu_info_mfn), - PAGE_OFFSET(d_vcpu->vcpu_info)); - if ( ret ) - return ret; - } - - /* Same for the (physically registered) runstate and time info are= as. */ + /* + * Map the vcpu_info page and the (physically registered) runstate= and + * time info areas. + */ + ret =3D copy_guest_area(&cd_vcpu->vcpu_info_area, + &d_vcpu->vcpu_info_area, cd_vcpu, d); + if ( ret ) + return ret; ret =3D copy_guest_area(&cd_vcpu->runstate_guest_area, &d_vcpu->runstate_guest_area, cd_vcpu, d); if ( ret ) diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c index f08b16bae2fe..81e4a0516d18 100644 --- a/xen/arch/x86/pv/shim.c +++ b/xen/arch/x86/pv/shim.c @@ -383,7 +383,7 @@ int pv_shim_shutdown(uint8_t reason) for_each_vcpu ( d, v ) { /* Unmap guest vcpu_info page and runstate/time areas. */ - unmap_vcpu_info(v); + unmap_guest_area(v, &v->vcpu_info_area); unmap_guest_area(v, &v->runstate_guest_area); unmap_guest_area(v, &v->arch.time_guest_area); =20 diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c index 73df1639a301..d0b0986509b2 100644 --- a/xen/arch/x86/time.c +++ b/xen/arch/x86/time.c @@ -1542,7 +1542,7 @@ static void __update_vcpu_system_time(struct vcpu *v,= int force) struct vcpu_time_info *u =3D &vcpu_info(v, time), _u; const struct domain *d =3D v->domain; =20 - if ( v->vcpu_info =3D=3D NULL ) + if ( !v->vcpu_info_area.map ) return; =20 collect_time_info(v, &_u); diff --git a/xen/arch/x86/x86_64/asm-offsets.c b/xen/arch/x86/x86_64/asm-of= fsets.c index fbd6c54188db..57b73a4e6214 100644 --- a/xen/arch/x86/x86_64/asm-offsets.c +++ b/xen/arch/x86/x86_64/asm-offsets.c @@ -53,7 +53,7 @@ void __dummy__(void) =20 OFFSET(VCPU_processor, struct vcpu, processor); OFFSET(VCPU_domain, struct vcpu, domain); - OFFSET(VCPU_vcpu_info, struct vcpu, vcpu_info); + OFFSET(VCPU_vcpu_info, struct vcpu, vcpu_info_area.map); OFFSET(VCPU_trap_bounce, struct vcpu, arch.pv.trap_bounce); OFFSET(VCPU_thread_flags, struct vcpu, arch.flags); OFFSET(VCPU_event_addr, struct vcpu, arch.pv.event_callback_eip); diff --git a/xen/arch/x86/x86_64/traps.c b/xen/arch/x86/x86_64/traps.c index f4d17b483032..e03e80813e36 100644 --- a/xen/arch/x86/x86_64/traps.c +++ b/xen/arch/x86/x86_64/traps.c @@ -96,7 +96,7 @@ static void _show_registers( if ( context =3D=3D CTXT_hypervisor ) printk(" %pS", _p(regs->rip)); printk("\nRFLAGS: %016lx ", regs->rflags); - if ( (context =3D=3D CTXT_pv_guest) && v && v->vcpu_info ) + if ( (context =3D=3D CTXT_pv_guest) && v && v->vcpu_info_area.map ) printk("EM: %d ", !!vcpu_info(v, evtchn_upcall_mask)); printk("CONTEXT: %s", context_names[context]); if ( v && !is_idle_vcpu(v) ) diff --git a/xen/common/compat/domain.c b/xen/common/compat/domain.c index c4254905359e..7ff238cc2656 100644 --- a/xen/common/compat/domain.c +++ b/xen/common/compat/domain.c @@ -49,7 +49,7 @@ int compat_common_vcpu_op(int cmd, struct vcpu *v, { case VCPUOP_initialise: { - if ( v->vcpu_info =3D=3D &dummy_vcpu_info ) + if ( v->vcpu_info_area.map =3D=3D &dummy_vcpu_info ) return -EINVAL; =20 #ifdef CONFIG_HVM diff --git a/xen/common/domain.c b/xen/common/domain.c index 486c1ae3f7f3..b8281d7cff9d 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -127,10 +127,10 @@ static void vcpu_info_reset(struct vcpu *v) { struct domain *d =3D v->domain; =20 - v->vcpu_info =3D ((v->vcpu_id < XEN_LEGACY_MAX_VCPUS) - ? (vcpu_info_t *)&shared_info(d, vcpu_info[v->vcpu_id]) - : &dummy_vcpu_info); - v->vcpu_info_mfn =3D INVALID_MFN; + v->vcpu_info_area.map =3D + ((v->vcpu_id < XEN_LEGACY_MAX_VCPUS) + ? (vcpu_info_t *)&shared_info(d, vcpu_info[v->vcpu_id]) + : &dummy_vcpu_info); } =20 static void vmtrace_free_buffer(struct vcpu *v) @@ -993,7 +993,7 @@ int domain_kill(struct domain *d) return -ERESTART; for_each_vcpu ( d, v ) { - unmap_vcpu_info(v); + unmap_guest_area(v, &v->vcpu_info_area); unmap_guest_area(v, &v->runstate_guest_area); } d->is_dying =3D DOMDYING_dead; @@ -1448,7 +1448,7 @@ int domain_soft_reset(struct domain *d, bool resuming) for_each_vcpu ( d, v ) { set_xen_guest_handle(runstate_guest(v), NULL); - unmap_vcpu_info(v); + unmap_guest_area(v, &v->vcpu_info_area); unmap_guest_area(v, &v->runstate_guest_area); } =20 @@ -1496,111 +1496,6 @@ int vcpu_reset(struct vcpu *v) return rc; } =20 -/* - * Map a guest page in and point the vcpu_info pointer at it. This - * makes sure that the vcpu_info is always pointing at a valid piece - * of memory, and it sets a pending event to make sure that a pending - * event doesn't get missed. - */ -int map_vcpu_info(struct vcpu *v, unsigned long gfn, unsigned int offset) -{ - struct domain *d =3D v->domain; - void *mapping; - vcpu_info_t *new_info; - struct page_info *page; - unsigned int align; - - if ( offset > (PAGE_SIZE - sizeof(*new_info)) ) - return -ENXIO; - -#ifdef CONFIG_COMPAT - BUILD_BUG_ON(sizeof(*new_info) !=3D sizeof(new_info->compat)); - if ( has_32bit_shinfo(d) ) - align =3D alignof(new_info->compat); - else -#endif - align =3D alignof(*new_info); - if ( offset & (align - 1) ) - return -ENXIO; - - if ( !mfn_eq(v->vcpu_info_mfn, INVALID_MFN) ) - return -EINVAL; - - /* Run this command on yourself or on other offline VCPUS. */ - if ( (v !=3D current) && !(v->pause_flags & VPF_down) ) - return -EINVAL; - - page =3D get_page_from_gfn(d, gfn, NULL, P2M_UNSHARE); - if ( !page ) - return -EINVAL; - - if ( !get_page_type(page, PGT_writable_page) ) - { - put_page(page); - return -EINVAL; - } - - mapping =3D __map_domain_page_global(page); - if ( mapping =3D=3D NULL ) - { - put_page_and_type(page); - return -ENOMEM; - } - - new_info =3D (vcpu_info_t *)(mapping + offset); - - if ( v->vcpu_info =3D=3D &dummy_vcpu_info ) - { - memset(new_info, 0, sizeof(*new_info)); -#ifdef XEN_HAVE_PV_UPCALL_MASK - __vcpu_info(v, new_info, evtchn_upcall_mask) =3D 1; -#endif - } - else - { - memcpy(new_info, v->vcpu_info, sizeof(*new_info)); - } - - v->vcpu_info =3D new_info; - v->vcpu_info_mfn =3D page_to_mfn(page); - - /* Set new vcpu_info pointer /before/ setting pending flags. */ - smp_wmb(); - - /* - * Mark everything as being pending just to make sure nothing gets - * lost. The domain will get a spurious event, but it can cope. - */ -#ifdef CONFIG_COMPAT - if ( !has_32bit_shinfo(d) ) - write_atomic(&new_info->native.evtchn_pending_sel, ~0); - else -#endif - write_atomic(&vcpu_info(v, evtchn_pending_sel), ~0); - vcpu_mark_events_pending(v); - - return 0; -} - -/* - * Unmap the vcpu info page if the guest decided to place it somewhere - * else. This is used from domain_kill() and domain_soft_reset(). - */ -void unmap_vcpu_info(struct vcpu *v) -{ - mfn_t mfn =3D v->vcpu_info_mfn; - - if ( mfn_eq(mfn, INVALID_MFN) ) - return; - - unmap_domain_page_global((void *) - ((unsigned long)v->vcpu_info & PAGE_MASK)); - - vcpu_info_reset(v); /* NB: Clobbers v->vcpu_info_mfn */ - - put_page_and_type(mfn_to_page(mfn)); -} - int map_guest_area(struct vcpu *v, paddr_t gaddr, unsigned int size, struct guest_area *area, void (*populate)(void *dst, struct vcpu *v)) @@ -1662,14 +1557,44 @@ int map_guest_area(struct vcpu *v, paddr_t gaddr, u= nsigned int size, =20 domain_lock(d); =20 - if ( map && populate ) - populate(map, v); + /* No re-registration of the vCPU info area. */ + if ( area !=3D &v->vcpu_info_area || !area->pg ) + { + if ( map && populate ) + populate(map, v); =20 - SWAP(area->pg, pg); - SWAP(area->map, map); + SWAP(area->pg, pg); + SWAP(area->map, map); + } + else + rc =3D -EBUSY; =20 domain_unlock(d); =20 + /* Set pending flags /after/ new vcpu_info pointer was set. */ + if ( area =3D=3D &v->vcpu_info_area && !rc ) + { + /* + * Mark everything as being pending just to make sure nothing gets + * lost. The domain will get a spurious event, but it can cope. + */ +#ifdef CONFIG_COMPAT + if ( !has_32bit_shinfo(d) ) + { + vcpu_info_t *info =3D area->map; + + /* For VCPUOP_register_vcpu_info handling in common_vcpu_op().= */ + BUILD_BUG_ON(sizeof(*info) !=3D sizeof(info->compat)); + write_atomic(&info->native.evtchn_pending_sel, ~0); + } + else +#endif + write_atomic(&vcpu_info(v, evtchn_pending_sel), ~0); + vcpu_mark_events_pending(v); + + force_update_vcpu_system_time(v); + } + if ( v !=3D current ) vcpu_unpause(v); =20 @@ -1699,7 +1624,10 @@ void unmap_guest_area(struct vcpu *v, struct guest_a= rea *area) =20 domain_lock(d); map =3D area->map; - area->map =3D NULL; + if ( area =3D=3D &v->vcpu_info_area ) + vcpu_info_reset(v); + else + area->map =3D NULL; pg =3D area->pg; area->pg =3D NULL; domain_unlock(d); @@ -1830,6 +1758,27 @@ bool update_runstate_area(struct vcpu *v) return rc; } =20 +/* + * This makes sure that the vcpu_info is always pointing at a valid piece = of + * memory, and it sets a pending event to make sure that a pending event + * doesn't get missed. + */ +static void cf_check +vcpu_info_populate(void *map, struct vcpu *v) +{ + vcpu_info_t *info =3D map; + + if ( v->vcpu_info_area.map =3D=3D &dummy_vcpu_info ) + { + memset(info, 0, sizeof(*info)); +#ifdef XEN_HAVE_PV_UPCALL_MASK + __vcpu_info(v, info, evtchn_upcall_mask) =3D 1; +#endif + } + else + memcpy(info, v->vcpu_info_area.map, sizeof(*info)); +} + static void cf_check runstate_area_populate(void *map, struct vcpu *v) { @@ -1859,7 +1808,7 @@ long common_vcpu_op(int cmd, struct vcpu *v, XEN_GUES= T_HANDLE_PARAM(void) arg) switch ( cmd ) { case VCPUOP_initialise: - if ( v->vcpu_info =3D=3D &dummy_vcpu_info ) + if ( v->vcpu_info_area.map =3D=3D &dummy_vcpu_info ) return -EINVAL; =20 rc =3D arch_initialise_vcpu(v, arg); @@ -1990,16 +1939,29 @@ long common_vcpu_op(int cmd, struct vcpu *v, XEN_GU= EST_HANDLE_PARAM(void) arg) case VCPUOP_register_vcpu_info: { struct vcpu_register_vcpu_info info; + paddr_t gaddr; =20 rc =3D -EFAULT; if ( copy_from_guest(&info, arg, 1) ) break; =20 - domain_lock(d); - rc =3D map_vcpu_info(v, info.mfn, info.offset); - domain_unlock(d); + rc =3D -EINVAL; + gaddr =3D gfn_to_gaddr(_gfn(info.mfn)) + info.offset; + if ( !~gaddr || + gfn_x(gaddr_to_gfn(gaddr)) !=3D info.mfn ) + break; =20 - force_update_vcpu_system_time(v); + /* Preliminary check only; see map_guest_area(). */ + rc =3D -EBUSY; + if ( v->vcpu_info_area.pg ) + break; + + /* See the BUILD_BUG_ON() in vcpu_info_populate(). */ + rc =3D map_guest_area(v, gaddr, sizeof(vcpu_info_t), + &v->vcpu_info_area, vcpu_info_populate); + if ( rc =3D=3D -ERESTART ) + rc =3D hypercall_create_continuation(__HYPERVISOR_vcpu_op, "ii= h", + cmd, vcpuid, arg); =20 break; } diff --git a/xen/include/xen/domain.h b/xen/include/xen/domain.h index a6b22fa2cac8..54d88bf5e34b 100644 --- a/xen/include/xen/domain.h +++ b/xen/include/xen/domain.h @@ -80,9 +80,6 @@ void cf_check free_pirq_struct(void *); int arch_vcpu_create(struct vcpu *v); void arch_vcpu_destroy(struct vcpu *v); =20 -int map_vcpu_info(struct vcpu *v, unsigned long gfn, unsigned int offset); -void unmap_vcpu_info(struct vcpu *v); - int map_guest_area(struct vcpu *v, paddr_t gaddr, unsigned int size, struct guest_area *area, void (*populate)(void *dst, struct vcpu *v)); diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 6e1028785d8c..3609ef88c4ff 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -176,7 +176,7 @@ struct vcpu =20 int processor; =20 - vcpu_info_t *vcpu_info; + struct guest_area vcpu_info_area; =20 struct domain *domain; =20 @@ -289,9 +289,6 @@ struct vcpu =20 struct waitqueue_vcpu *waitqueue_vcpu; =20 - /* Guest-specified relocation of vcpu_info. */ - mfn_t vcpu_info_mfn; - struct evtchn_fifo_vcpu *evtchn_fifo; =20 /* vPCI per-vCPU area, used to store data for long running operations.= */ diff --git a/xen/include/xen/shared.h b/xen/include/xen/shared.h index a411a8a3e38d..5b71342cab32 100644 --- a/xen/include/xen/shared.h +++ b/xen/include/xen/shared.h @@ -44,6 +44,7 @@ typedef struct vcpu_info vcpu_info_t; extern vcpu_info_t dummy_vcpu_info; =20 #define shared_info(d, field) __shared_info(d, (d)->shared_info, fiel= d) -#define vcpu_info(v, field) __vcpu_info(v, (v)->vcpu_info, field) +#define vcpu_info(v, field) \ + __vcpu_info(v, (vcpu_info_t *)(v)->vcpu_info_area.map, field) =20 #endif /* __XEN_SHARED_H__ */ --=20 2.42.0