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charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) At this moment a guest can call vmfunc to change the altp2m view. This should be limited in order to avoid any unwanted view switch. The new xc_altp2m_set_visibility() solves this by making views invisible to vmfunc. This is done by having a separate arch.altp2m_working_eptp that is populated and made invalid in the same places as altp2m_eptp. This is written to EPTP_LIST_ADDR. The views are made in/visible by marking them with INVALID_MFN or copying them back from altp2m_eptp. To have consistency the visibility also applies to p2m_switch_domain_altp2m_by_id(). Note: If altp2m mode is set to mixed the guest is able to change the view visibility and then call vmfunc. Signed-off-by: Alexandru Isaila --- CC: Ian Jackson CC: Wei Liu CC: Andrew Cooper CC: George Dunlap CC: Jan Beulich CC: Julien Grall CC: Konrad Rzeszutek Wilk CC: Stefano Stabellini CC: "Roger Pau Monn=C3=A9" CC: Jun Nakajima CC: Kevin Tian --- Changes since V4: - Move p2m specific things from hvm to p2m.c - Add comment for altp2m_idx bounds check - Add altp2m_list_lock/unlock(). Changes since V3: - Change var name form altp2m_idx to idx to shorten line length - Add bounds check for idx - Update commit message - Add comment in xenctrl.h. Changes since V2: - Drop hap_enabled() check - Reduce the indentation depth in hvm.c - Fix assignment indentation - Drop pad2. Changes since V1: - Drop double view from title. --- tools/libxc/include/xenctrl.h | 7 +++++++ tools/libxc/xc_altp2m.c | 24 ++++++++++++++++++++++ xen/arch/x86/hvm/hvm.c | 14 +++++++++++++ xen/arch/x86/hvm/vmx/vmx.c | 2 +- xen/arch/x86/mm/hap/hap.c | 15 ++++++++++++++ xen/arch/x86/mm/p2m-ept.c | 1 + xen/arch/x86/mm/p2m.c | 36 +++++++++++++++++++++++++++++++-- xen/include/asm-x86/domain.h | 1 + xen/include/asm-x86/p2m.h | 4 ++++ xen/include/public/hvm/hvm_op.h | 9 +++++++++ 10 files changed, 110 insertions(+), 3 deletions(-) diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h index 99552a5f73..b26fccc989 100644 --- a/tools/libxc/include/xenctrl.h +++ b/tools/libxc/include/xenctrl.h @@ -1943,6 +1943,13 @@ int xc_altp2m_change_gfn(xc_interface *handle, uint3= 2_t domid, xen_pfn_t new_gfn); int xc_altp2m_get_vcpu_p2m_idx(xc_interface *handle, uint32_t domid, uint32_t vcpuid, uint16_t *p2midx); +/* + * Set view visibility for xc_altp2m_switch_to_view and vmfunc. + * Note: If altp2m mode is set to mixed the guest is able to change the vi= ew + * visibility and then call vmfunc. + */ +int xc_altp2m_set_visibility(xc_interface *handle, uint32_t domid, + uint16_t view_id, bool visible); =20 /**=20 * Mem paging operations. diff --git a/tools/libxc/xc_altp2m.c b/tools/libxc/xc_altp2m.c index 46fb725806..6987c9541f 100644 --- a/tools/libxc/xc_altp2m.c +++ b/tools/libxc/xc_altp2m.c @@ -410,3 +410,27 @@ int xc_altp2m_get_vcpu_p2m_idx(xc_interface *handle, u= int32_t domid, xc_hypercall_buffer_free(handle, arg); return rc; } + +int xc_altp2m_set_visibility(xc_interface *handle, uint32_t domid, + uint16_t view_id, bool visible) +{ + int rc; + + DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg); + + arg =3D xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg)); + if ( arg =3D=3D NULL ) + return -1; + + arg->version =3D HVMOP_ALTP2M_INTERFACE_VERSION; + arg->cmd =3D HVMOP_altp2m_set_visibility; + arg->domain =3D domid; + arg->u.set_visibility.altp2m_idx =3D view_id; + arg->u.set_visibility.visible =3D visible; + + rc =3D xencall2(handle->xcall, __HYPERVISOR_hvm_op, HVMOP_altp2m, + HYPERCALL_BUFFER_AS_ARG(arg)); + + xc_hypercall_buffer_free(handle, arg); + return rc; +} diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c index a339b36a0d..25a65f6e25 100644 --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -4563,6 +4563,7 @@ static int do_altp2m_op( case HVMOP_altp2m_get_mem_access: case HVMOP_altp2m_change_gfn: case HVMOP_altp2m_get_p2m_idx: + case HVMOP_altp2m_set_visibility: break; =20 default: @@ -4840,6 +4841,19 @@ static int do_altp2m_op( break; } =20 + case HVMOP_altp2m_set_visibility: + { + uint16_t idx =3D a.u.set_visibility.altp2m_idx; + + if ( a.u.set_visibility.pad ) + rc =3D -EINVAL; + else if ( !altp2m_active(d) ) + rc =3D -EOPNOTSUPP; + else + rc =3D p2m_set_altp2m_view_visibility(d, idx, + a.u.set_visibility.visible= ); + } + default: ASSERT_UNREACHABLE(); } diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c index d265ed46ad..bb44ef39a1 100644 --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -2140,7 +2140,7 @@ static void vmx_vcpu_update_vmfunc_ve(struct vcpu *v) { v->arch.hvm.vmx.secondary_exec_control |=3D mask; __vmwrite(VM_FUNCTION_CONTROL, VMX_VMFUNC_EPTP_SWITCHING); - __vmwrite(EPTP_LIST_ADDR, virt_to_maddr(d->arch.altp2m_eptp)); + __vmwrite(EPTP_LIST_ADDR, virt_to_maddr(d->arch.altp2m_working_ept= p)); =20 if ( cpu_has_vmx_virt_exceptions ) { diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c index 3d93f3451c..5969ec8922 100644 --- a/xen/arch/x86/mm/hap/hap.c +++ b/xen/arch/x86/mm/hap/hap.c @@ -488,8 +488,17 @@ int hap_enable(struct domain *d, u32 mode) goto out; } =20 + if ( (d->arch.altp2m_working_eptp =3D alloc_xenheap_page()) =3D=3D= NULL ) + { + rv =3D -ENOMEM; + goto out; + } + for ( i =3D 0; i < MAX_EPTP; i++ ) + { d->arch.altp2m_eptp[i] =3D mfn_x(INVALID_MFN); + d->arch.altp2m_working_eptp[i] =3D mfn_x(INVALID_MFN); + } =20 for ( i =3D 0; i < MAX_ALTP2M; i++ ) { @@ -523,6 +532,12 @@ void hap_final_teardown(struct domain *d) d->arch.altp2m_eptp =3D NULL; } =20 + if ( d->arch.altp2m_working_eptp ) + { + free_xenheap_page(d->arch.altp2m_working_eptp); + d->arch.altp2m_working_eptp =3D NULL; + } + for ( i =3D 0; i < MAX_ALTP2M; i++ ) p2m_teardown(d->arch.altp2m_p2m[i]); } diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c index eb0f0edfef..6539ca619b 100644 --- a/xen/arch/x86/mm/p2m-ept.c +++ b/xen/arch/x86/mm/p2m-ept.c @@ -1368,6 +1368,7 @@ void p2m_init_altp2m_ept(struct domain *d, unsigned i= nt i) ept =3D &p2m->ept; ept->mfn =3D pagetable_get_pfn(p2m_get_pagetable(p2m)); d->arch.altp2m_eptp[array_index_nospec(i, MAX_EPTP)] =3D ept->eptp; + d->arch.altp2m_working_eptp[array_index_nospec(i, MAX_EPTP)] =3D ept->= eptp; } =20 unsigned int p2m_find_altp2m_by_eptp(struct domain *d, uint64_t eptp) diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c index c5f428d67c..27a812a7bb 100644 --- a/xen/arch/x86/mm/p2m.c +++ b/xen/arch/x86/mm/p2m.c @@ -2515,6 +2515,7 @@ void p2m_flush_altp2m(struct domain *d) { p2m_reset_altp2m(d, i, ALTP2M_DEACTIVATE); d->arch.altp2m_eptp[i] =3D mfn_x(INVALID_MFN); + d->arch.altp2m_working_eptp[i] =3D mfn_x(INVALID_MFN); } =20 altp2m_list_unlock(d); @@ -2634,7 +2635,9 @@ int p2m_destroy_altp2m_by_id(struct domain *d, unsign= ed int idx) { p2m_reset_altp2m(d, idx, ALTP2M_DEACTIVATE); d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] =3D - mfn_x(INVALID_MFN); + mfn_x(INVALID_MFN); + d->arch.altp2m_working_eptp[array_index_nospec(idx, MAX_EPTP)]= =3D + mfn_x(INVALID_MFN); rc =3D 0; } } @@ -2661,7 +2664,7 @@ int p2m_switch_domain_altp2m_by_id(struct domain *d, = unsigned int idx) rc =3D -EINVAL; altp2m_list_lock(d); =20 - if ( d->arch.altp2m_eptp[idx] !=3D mfn_x(INVALID_MFN) ) + if ( d->arch.altp2m_working_eptp[idx] !=3D mfn_x(INVALID_MFN) ) { for_each_vcpu( d, v ) if ( idx !=3D vcpu_altp2m(v).p2midx ) @@ -3145,6 +3148,35 @@ int p2m_get_suppress_ve(struct domain *d, gfn_t gfn,= bool *suppress_ve, =20 return rc; } + +int p2m_set_altp2m_view_visibility(struct domain *d, unsigned int altp2m_i= dx, + uint8_t visible) +{ + altp2m_list_lock(d); + + /* + * Eptp index is correlated with altp2m index and should not exceed + * min(MAX_ALTP2M, MAX_EPTP). + */ + if ( altp2m_idx >=3D min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) || + d->arch.altp2m_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] =3D= =3D + mfn_x(INVALID_MFN) ) + { + altp2m_list_unlock(d); + return -EINVAL; + } + + if ( visible ) + d->arch.altp2m_working_eptp[array_index_nospec(altp2m_idx, MAX_EPT= P)] =3D + d->arch.altp2m_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)]; + else + d->arch.altp2m_working_eptp[array_index_nospec(altp2m_idx, MAX_EPT= P)] =3D + mfn_x(INVALID_MFN); + + altp2m_list_unlock(d); + + return 0; +} #endif =20 /* diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h index 105adf96eb..800e12eae5 100644 --- a/xen/include/asm-x86/domain.h +++ b/xen/include/asm-x86/domain.h @@ -327,6 +327,7 @@ struct arch_domain struct p2m_domain *altp2m_p2m[MAX_ALTP2M]; mm_lock_t altp2m_list_lock; uint64_t *altp2m_eptp; + uint64_t *altp2m_working_eptp; #endif =20 /* NB. protected by d->event_lock and by irq_desc[irq].lock */ diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h index 928a7c627a..015d509f7b 100644 --- a/xen/include/asm-x86/p2m.h +++ b/xen/include/asm-x86/p2m.h @@ -897,6 +897,10 @@ int p2m_change_altp2m_gfn(struct domain *d, unsigned i= nt idx, int p2m_altp2m_propagate_change(struct domain *d, gfn_t gfn, mfn_t mfn, unsigned int page_order, p2m_type_t p2mt, p2m_access_t p2ma); + +/* Set a specific p2m view visibility */ +int p2m_set_altp2m_view_visibility(struct domain *d, unsigned int idx, + uint8_t visible); #else struct p2m_domain *p2m_get_altp2m(struct vcpu *v); static inline void p2m_altp2m_check(struct vcpu *v, uint16_t idx) {} diff --git a/xen/include/public/hvm/hvm_op.h b/xen/include/public/hvm/hvm_o= p.h index b599d3cbd0..870ec52060 100644 --- a/xen/include/public/hvm/hvm_op.h +++ b/xen/include/public/hvm/hvm_op.h @@ -318,6 +318,12 @@ struct xen_hvm_altp2m_get_vcpu_p2m_idx { uint16_t altp2m_idx; }; =20 +struct xen_hvm_altp2m_set_visibility { + uint16_t altp2m_idx; + uint8_t visible; + uint8_t pad; +}; + struct xen_hvm_altp2m_op { uint32_t version; /* HVMOP_ALTP2M_INTERFACE_VERSION */ uint32_t cmd; @@ -350,6 +356,8 @@ struct xen_hvm_altp2m_op { #define HVMOP_altp2m_get_p2m_idx 14 /* Set the "Supress #VE" bit for a range of pages */ #define HVMOP_altp2m_set_suppress_ve_multi 15 +/* Set visibility for a given altp2m view */ +#define HVMOP_altp2m_set_visibility 16 domid_t domain; uint16_t pad1; uint32_t pad2; @@ -367,6 +375,7 @@ struct xen_hvm_altp2m_op { struct xen_hvm_altp2m_suppress_ve_multi suppress_ve_multi; struct xen_hvm_altp2m_vcpu_disable_notify disable_notify; struct xen_hvm_altp2m_get_vcpu_p2m_idx get_vcpu_p2m_idx; + struct xen_hvm_altp2m_set_visibility set_visibility; uint8_t pad[64]; } u; }; --=20 2.17.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel