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d="scan'208";a="50296498" From: Jane Malalane To: Xen-devel CC: Jane Malalane , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu Subject: [PATCH] x86/pv: Provide more helpful error when CONFIG_PV32 is absent Date: Thu, 12 Aug 2021 12:48:57 +0100 Message-ID: <20210812114857.20971-1-jane.malalane@citrix.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1628768981301100001 Currently, when booting a 32bit dom0 kernel, the message isn't very helpful: (XEN) Xen kernel: 64-bit, lsb (XEN) Dom0 kernel: 32-bit, PAE, lsb, paddr 0x100000 -> 0x112000 (XEN) Mismatch between Xen and DOM0 kernel (XEN) (XEN) **************************************** (XEN) Panic on CPU 0: (XEN) Could not construct domain 0 (XEN) **************************************** With this adjustment, it now looks like this: (XEN) Xen kernel: 64-bit, lsb (XEN) Found 32-bit PV kernel, but CONFIG_PV32 missing (XEN) (XEN) **************************************** (XEN) Panic on CPU 0: (XEN) Could not construct domain 0 (XEN) **************************************** Suggested-by: Andrew Cooper Signed-off-by: Jane Malalane Reviewed-by: Jan Beulich --- CC: Jan Beulich CC: Andrew Cooper CC: "Roger Pau Monn=C3=A9" CC: Wei Liu --- xen/arch/x86/pv/dom0_build.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c index af47615b22..80e6c6e35b 100644 --- a/xen/arch/x86/pv/dom0_build.c +++ b/xen/arch/x86/pv/dom0_build.c @@ -362,9 +362,9 @@ int __init dom0_construct_pv(struct domain *d, compatible =3D false; machine =3D elf_uval(&elf, elf.ehdr, e_machine); =20 -#ifdef CONFIG_PV32 if ( elf_32bit(&elf) ) { +#ifdef CONFIG_PV32 if ( parms.pae =3D=3D XEN_PAE_BIMODAL ) parms.pae =3D XEN_PAE_EXTCR3; if ( parms.pae && machine =3D=3D EM_386 ) @@ -377,8 +377,12 @@ int __init dom0_construct_pv(struct domain *d, =20 compatible =3D true; } - } +#else + printk("Found 32-bit PV kernel, but CONFIG_PV32 missing\n"); + rc =3D -ENODEV; + goto out; #endif + } =20 compat =3D is_pv_32bit_domain(d); =20 --=20 2.11.0