From nobody Sat Oct 4 03:04:08 2025 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 685492E266E for ; Thu, 21 Aug 2025 04:29:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755750571; cv=none; b=Wi2kvnzGRJfhcXdRwyJ3+TKI6C0Xx9nZdbfD0y5QcTN3UDLAC1AZvsYfgQip/D5aTmai5aP5s7qc3JN5e5TlAVNGYXBzujtSr6ruQAwbCUC6J4Nv/YLbs4YHt5aj2MsXSjb4QgMWQHqKBSKHSufmWdTqBxcRbAoQ25MT9q/nJ9w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755750571; c=relaxed/simple; bh=oza6hx2ntzUZXObmix0KiLo9V3JboBdBQCO1cnzK8hQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=NdkQfvBWjBExWvQL9M3yyXk87HGjZGWC3nGK/PCNKLJfFqJF6syKLfYWaKbyWWn05Qsn7kkbRosU01wRVXmXCPzSNQouzjPqVFIh+gsaByuFGz9ZGHZ1EaHpe9vMDJD9E+g9so7bkQi1y2zNKvawrDdVPWFoOnl/jhMyEOATGYc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--sagis.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=eqN1UGq7; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--sagis.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="eqN1UGq7" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-323266c83f6so644357a91.0 for ; Wed, 20 Aug 2025 21:29:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1755750568; x=1756355368; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=FRFEjTGnGKNT/7J5APntzZoA6CylwPAhIKfI752BiBs=; b=eqN1UGq77WT4zjkWFh+zFFBywaJjTNbP3Z8lGFQ3U5hJA7VM4Dhzn5uWV/C1mY6tp+ URcn/hAFcDkasv5MtTym9v4nZSRRZgl2t0UTpjRh+6KjFHcIE+Z/0bKlBPbhoWEPNPMj VYReKi8ToNBOiGDYMykMNCX7/ak+rFRlEuFRCEFQeLMroBxNnCV6FW3b/alCQQ2q70m9 4Dinxy/r6kEOJKWIHVTNYYgO4In1lNZ8PD1yOllUIl0nX4mM+oksFgW/HgqwHqPV0UQA P/X1N3G/XFbShmk2pPDjwxzdUBvOdHU6P6fvEKtUrGP6OihhzbIbtCWPtMffPeeWFwlk H9Hg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755750568; x=1756355368; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=FRFEjTGnGKNT/7J5APntzZoA6CylwPAhIKfI752BiBs=; b=pN5he5kvCjh7SwBILqbLt+QGTqEsUvkn15o1czft8rQRepegTrF/Ibz92t9GACRD1h flNsH4r/g3TAqwKz4zQe/iFPMpc8bxL6n66qM2OZCXKk0NKhuMYtiPMMt46LRfrEf5oB fEi8ZdQAh/iU57awmL7mkvCtIL6eZXON/CJrS1NHK+RnbqkcJbbIamDVbRsKtoEH/M55 BEurbP/8xtvTWzDT0229ufmsrxb2WA+o7uGirUXmxLAsVtf9Lqv+SLzWq0bO1okpCFHN mbpunsbvc//v3wFzFPVyNbRCBCPuIQyig+B6AR+GPT0FwKkXTV/cLPq1xYoBmH81FkDK oipA== X-Gm-Message-State: AOJu0YwFL//T1ie8sJrLIyZ5xHteAaA18r2HzjjbQBHPn8BJqitxLOiP aK0qu8d6uKxapbQhR8tNAkCtPwl0Cj2dTT3uPyChhmM60lmR6O9OB+6cLewAYFM0B+z6hnv8bL2 FaA== X-Google-Smtp-Source: AGHT+IGgXv0HXZJEaeYeMRs0Tu4Cdx9jcHbVap6aLHFdU7b6D7sdqdWyIH1R2tQe7TkoFGhR8InX65S0gA== X-Received: from pjbsl4.prod.google.com ([2002:a17:90b:2e04:b0:312:ea08:fa64]) (user=sagis job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:2c90:b0:30a:3e8e:ea30 with SMTP id 98e67ed59e1d1-324eedf50bfmr1190919a91.11.1755750568559; Wed, 20 Aug 2025 21:29:28 -0700 (PDT) Date: Wed, 20 Aug 2025 21:28:56 -0700 In-Reply-To: <20250821042915.3712925-1-sagis@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250821042915.3712925-1-sagis@google.com> X-Mailer: git-send-email 2.51.0.rc1.193.gad69d77794-goog Message-ID: <20250821042915.3712925-4-sagis@google.com> Subject: [PATCH v9 03/19] KVM: selftests: Expose functions to get default sregs values From: Sagi Shahar To: linux-kselftest@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sean Christopherson , Ackerley Tng , Ryan Afranji , Andrew Jones , Isaku Yamahata , Erdem Aktas , Rick Edgecombe , Sagi Shahar , Roger Wang , Binbin Wu , Oliver Upton , "Pratik R. Sampat" , Reinette Chatre , Ira Weiny , Chao Gao , Chenyi Qiang Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" TDX can't set sregs values directly using KVM_SET_SREGS. Expose the default values of certain sregs used by TDX VMs so they can be set manually. Signed-off-by: Sagi Shahar --- .../selftests/kvm/include/x86/processor.h | 6 +++ .../testing/selftests/kvm/lib/x86/processor.c | 41 +++++++++++++++---- 2 files changed, 40 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/kvm/include/x86/processor.h b/tools/te= sting/selftests/kvm/include/x86/processor.h index 2efb05c2f2fb..5c16507f9b2d 100644 --- a/tools/testing/selftests/kvm/include/x86/processor.h +++ b/tools/testing/selftests/kvm/include/x86/processor.h @@ -1026,6 +1026,12 @@ static inline struct kvm_cpuid2 *allocate_kvm_cpuid2= (int nr_entries) =20 void vcpu_init_cpuid(struct kvm_vcpu *vcpu, const struct kvm_cpuid2 *cpuid= ); =20 +uint16_t kvm_get_default_idt_limit(void); +uint16_t kvm_get_default_gdt_limit(void); +uint64_t kvm_get_default_cr0(void); +uint64_t kvm_get_default_cr4(void); +uint64_t kvm_get_default_efer(void); + static inline void vcpu_get_cpuid(struct kvm_vcpu *vcpu) { vcpu_ioctl(vcpu, KVM_GET_CPUID2, vcpu->cpuid); diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testin= g/selftests/kvm/lib/x86/processor.c index d4c19ac885a9..b2a4b11ac8c0 100644 --- a/tools/testing/selftests/kvm/lib/x86/processor.c +++ b/tools/testing/selftests/kvm/lib/x86/processor.c @@ -488,6 +488,35 @@ static void kvm_seg_set_tss_64bit(vm_vaddr_t base, str= uct kvm_segment *segp) segp->present =3D 1; } =20 +uint16_t kvm_get_default_idt_limit(void) +{ + return NUM_INTERRUPTS * sizeof(struct idt_entry) - 1; +} + +uint16_t kvm_get_default_gdt_limit(void) +{ + return getpagesize() - 1; +} + +uint64_t kvm_get_default_cr0(void) +{ + return X86_CR0_PE | X86_CR0_NE | X86_CR0_PG; +} + +uint64_t kvm_get_default_cr4(void) +{ + uint64_t cr4 =3D X86_CR4_PAE | X86_CR4_OSFXSR; + + if (kvm_cpu_has(X86_FEATURE_XSAVE)) + cr4 |=3D X86_CR4_OSXSAVE; + return cr4; +} + +uint64_t kvm_get_default_efer(void) +{ + return EFER_LME | EFER_LMA | EFER_NX; +} + static void vcpu_init_sregs(struct kvm_vm *vm, struct kvm_vcpu *vcpu) { struct kvm_sregs sregs; @@ -498,15 +527,13 @@ static void vcpu_init_sregs(struct kvm_vm *vm, struct= kvm_vcpu *vcpu) vcpu_sregs_get(vcpu, &sregs); =20 sregs.idt.base =3D vm->arch.idt; - sregs.idt.limit =3D NUM_INTERRUPTS * sizeof(struct idt_entry) - 1; + sregs.idt.limit =3D kvm_get_default_idt_limit(); sregs.gdt.base =3D vm->arch.gdt; - sregs.gdt.limit =3D getpagesize() - 1; + sregs.gdt.limit =3D kvm_get_default_gdt_limit(); =20 - sregs.cr0 =3D X86_CR0_PE | X86_CR0_NE | X86_CR0_PG; - sregs.cr4 |=3D X86_CR4_PAE | X86_CR4_OSFXSR; - if (kvm_cpu_has(X86_FEATURE_XSAVE)) - sregs.cr4 |=3D X86_CR4_OSXSAVE; - sregs.efer |=3D (EFER_LME | EFER_LMA | EFER_NX); + sregs.cr0 =3D kvm_get_default_cr0(); + sregs.cr4 |=3D kvm_get_default_cr4(); + sregs.efer |=3D kvm_get_default_efer(); =20 kvm_seg_set_unusable(&sregs.ldt); kvm_seg_set_kernel_code_64bit(&sregs.cs); --=20 2.51.0.rc1.193.gad69d77794-goog