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Message-ID: Date: Tue, 6 Dec 2022 14:56:03 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1 Subject: [PATCH 4/5] x86/tboot: correct IOMMU (VT-d) interaction Content-Language: en-US From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , George Dunlap , Lukasz Hawrylko , "Daniel P. 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charset="utf-8" First of all using is_idle_domain() on the subject domain in the body of for_each_domain() is pointless. Replace that conditional by one checking that a domain actually has IOMMU support enabled for it, and that we're actually on a VT-d system (both are largely cosmetic / documentary with how things work elsewhere, but still). Reported-by: Andrew Cooper Signed-off-by: Jan Beulich Reviewed-by: Andrew Cooper Reviewed-by: Jason Andryuk --- a/xen/arch/x86/tboot.c +++ b/xen/arch/x86/tboot.c @@ -31,6 +31,8 @@ static vmac_t frametable_mac; /* MAC for static uint64_t __initdata txt_heap_base, __initdata txt_heap_size; static uint64_t __initdata sinit_base, __initdata sinit_size; =20 +static bool __ro_after_init is_vtd; + /* * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_B= ASE) */ @@ -201,7 +203,7 @@ static void tboot_gen_domain_integrity(c } spin_unlock(&d->page_alloc_lock); =20 - if ( !is_idle_domain(d) ) + if ( is_iommu_enabled(d) && is_vtd ) { const struct domain_iommu *dio =3D dom_iommu(d); =20 @@ -444,6 +446,8 @@ int __init cf_check tboot_parse_dmar_tab if ( txt_heap_base =3D=3D 0 ) return 1; =20 + is_vtd =3D true; + /* walk heap to SinitMleData */ pa =3D txt_heap_base; /* skip BiosData */