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Thu, 08 Aug 2024 06:43:04 -0700 (PDT) From: Alejandro Vallejo To: Xen-devel Cc: Alejandro Vallejo , Anthony PERARD , Juergen Gross Subject: [PATCH v5 09/10] tools/libguest: Set distinct x2APIC IDs for each vCPU Date: Thu, 8 Aug 2024 14:42:49 +0100 Message-ID: <20240808134251.29995-10-alejandro.vallejo@cloud.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240808134251.29995-1-alejandro.vallejo@cloud.com> References: <20240808134251.29995-1-alejandro.vallejo@cloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1723124605997116600 Content-Type: text/plain; charset="utf-8" Have toolstack populate the new x2APIC ID in the LAPIC save record with the proper IDs intended for each vCPU. Signed-off-by: Alejandro Vallejo --- v5: * No change --- tools/libs/guest/xg_dom_x86.c | 38 ++++++++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/tools/libs/guest/xg_dom_x86.c b/tools/libs/guest/xg_dom_x86.c index fafe7acb7e91..a3e4e2052128 100644 --- a/tools/libs/guest/xg_dom_x86.c +++ b/tools/libs/guest/xg_dom_x86.c @@ -1004,19 +1004,40 @@ static int vcpu_hvm(struct xc_dom_image *dom) HVM_SAVE_TYPE(HEADER) header; struct hvm_save_descriptor mtrr_d; HVM_SAVE_TYPE(MTRR) mtrr; + struct hvm_save_descriptor lapic_d; + HVM_SAVE_TYPE(LAPIC) lapic; struct hvm_save_descriptor end_d; HVM_SAVE_TYPE(END) end; } vcpu_ctx; - /* Context from full_ctx */ + /* Contexts from full_ctx */ const HVM_SAVE_TYPE(MTRR) *mtrr_record; + const HVM_SAVE_TYPE(LAPIC) *lapic_record; /* Raw context as taken from Xen */ uint8_t *full_ctx =3D NULL; + xc_cpu_policy_t *policy =3D xc_cpu_policy_init(); int rc; =20 DOMPRINTF_CALLED(dom->xch); =20 assert(dom->max_vcpus); =20 + /* + * Fetch the CPU policy of this domain. We need it to determine the AP= IC IDs + * each of vCPU in a manner consistent with the exported topology. + * + * TODO: It's silly to query a policy we have ourselves created. It sh= ould + * instead be part of xc_dom_image + */ + + rc =3D xc_cpu_policy_get_domain(dom->xch, dom->guest_domid, policy); + if ( rc !=3D 0 ) + { + xc_dom_panic(dom->xch, XC_INTERNAL_ERROR, + "%s: unable to fetch cpu policy for dom%u (rc=3D%d)", + __func__, dom->guest_domid, rc); + goto out; + } + /* * Get the full HVM context in order to have the header, it is not * possible to get the header with getcontext_partial, and crafting one @@ -1111,6 +1132,8 @@ static int vcpu_hvm(struct xc_dom_image *dom) vcpu_ctx.mtrr_d.typecode =3D HVM_SAVE_CODE(MTRR); vcpu_ctx.mtrr_d.length =3D HVM_SAVE_LENGTH(MTRR); vcpu_ctx.mtrr =3D *mtrr_record; + vcpu_ctx.lapic_d.typecode =3D HVM_SAVE_CODE(LAPIC); + vcpu_ctx.lapic_d.length =3D HVM_SAVE_LENGTH(LAPIC); vcpu_ctx.end_d =3D bsp_ctx.end_d; vcpu_ctx.end =3D bsp_ctx.end; =20 @@ -1125,6 +1148,18 @@ static int vcpu_hvm(struct xc_dom_image *dom) { vcpu_ctx.mtrr_d.instance =3D i; =20 + lapic_record =3D hvm_get_save_record(full_ctx, HVM_SAVE_CODE(LAPIC= ), i); + if ( !lapic_record ) + { + xc_dom_panic(dom->xch, XC_INTERNAL_ERROR, + "%s: unable to get LAPIC[%d] save record", __func= __, i); + goto out; + } + + vcpu_ctx.lapic =3D *lapic_record; + vcpu_ctx.lapic.x2apic_id =3D x86_x2apic_id_from_vcpu_id(&policy->p= olicy, i); + vcpu_ctx.lapic_d.instance =3D i; + rc =3D xc_domain_hvm_setcontext(dom->xch, dom->guest_domid, (uint8_t *)&vcpu_ctx, sizeof(vcpu_ct= x)); if ( rc !=3D 0 ) @@ -1147,6 +1182,7 @@ static int vcpu_hvm(struct xc_dom_image *dom) =20 out: free(full_ctx); + xc_cpu_policy_destroy(policy); return rc; } =20 --=20 2.45.2