From mboxrd@z Thu Jan 1 00:00:00 1970 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 684872E2289 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=1755750570; cv=none; b=dXoLZIs0fRmeG+37bMdbPyD82IfZxWGgXQTWtCEoQU8HbEV5DNhLko0iJUtPg+IlQsIhzVoxRPefFy8IScSxfQnTV3Uyup8BOz5KQ6DJSEg1injwJpx/k2lOr2qthzwin36h9eAWqj7qzhocu4zyFeL3izkcJtB8eQibUVCo7/g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755750570; c=relaxed/simple; bh=oza6hx2ntzUZXObmix0KiLo9V3JboBdBQCO1cnzK8hQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=rB92kELbJEcDqsLi/7dLnlmXdtbXC38gHZXhlmWDphfyiKp73apqeacI/0cVq1e+TM2evXJ65Wx0mju7Mo97yXx0JCnWq6LUrbzeC0fmwB4AbZH557IwB6dibns8r7T1riJ8rrw0LDIVnSTV5kAXwdvFqohyOnOB5yK3jO+HNAo= 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=QLIeOsSW; 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="QLIeOsSW" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-32326de9d22so635182a91.1 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=1755750569; x=1756355369; 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=QLIeOsSWZeX5BMpWErJKXTfvsKQm7zA+El5U/KF+IgezD1FEBNTaTGjzDeE6JLy1Hj 5ppasuhhRA00dXxRTpQf2Q2T488pFcFRns3XJIFvR5s9YTMJQlwHTcDwDnXfNmJS0DY9 bhnvzlAmhLScqFQtQCOAKmoJKkKCPaSwpgSebbNVG1UuJnN02/bx7YjrakmTpeiXOsdc l5VN81M4n66agAxcH3Pe5ezspDt4Uies61vt0NZ7/wwcf2Cs+nMhLbxWc7fuOTOk9Pti Yxsoyhd+K2pHDpUs3+6XxT/J7AccXjLQRdeb4e2Y7yJRYLE4fSBhVjbiSuT67sxw0Ps+ G/Nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755750569; x=1756355369; 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=SBGqYmG9vtbMcMBbiWBnsjqJwy0W3HP0EwxkyWuVTci8Y8wq/qiFp8EQVotKjCecfG mt79MyW34h1JbVnWFV5ty0l+cgCdLznwzt5iy4QuWxR+kH9Y6LL7YsoEfPPnmt/OITds +Opl3dnX+h255Xbd9lP4VfcxFQvnw6SSP+9BcbQtkXoCQTf4rxaiX3vxd1WBjzNM3S4M 97I2VKRUjqyDomZ0xvbHATmIiiXlCrkM5DujegzyISWpv7USAjeCXLmUtAXFXwf6qwiR 3Hc78nHRsd8mrO3hUM9+EWAhn8BIt2vlS6pUyHYyH7VpNQ+E+sqnvJdrcwj0ZjV7oVJg o8MA== X-Gm-Message-State: AOJu0Yxjtww80yLmWNuu5W5qvz24CVr6/fmRM4FrfEBC0UU1dhoNa/+Q 1KwU1IedP3OBYLDp8JVZQKOtAGoloQJBXLBPXno40ThgyzTYwGI+I+0uj5GmBs2ZEpBI4El/hKY GCfEopOrgWSeMmAoJEqZ1o3ecjr9r27URFnm/QpD2QWSOLpemtfh8qVplV7vq9cDH/l3LUjHdIi DIngbh2csZzDDxwRGroJBYvNaWpGYdQaHa+647AmkruNQ= 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-kselftest@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-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/testing/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) void vcpu_init_cpuid(struct kvm_vcpu *vcpu, const struct kvm_cpuid2 *cpuid); +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/testing/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, struct kvm_segment *segp) segp->present = 1; } +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 = X86_CR4_PAE | X86_CR4_OSFXSR; + + if (kvm_cpu_has(X86_FEATURE_XSAVE)) + cr4 |= 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); sregs.idt.base = vm->arch.idt; - sregs.idt.limit = NUM_INTERRUPTS * sizeof(struct idt_entry) - 1; + sregs.idt.limit = kvm_get_default_idt_limit(); sregs.gdt.base = vm->arch.gdt; - sregs.gdt.limit = getpagesize() - 1; + sregs.gdt.limit = kvm_get_default_gdt_limit(); - sregs.cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG; - sregs.cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR; - if (kvm_cpu_has(X86_FEATURE_XSAVE)) - sregs.cr4 |= X86_CR4_OSXSAVE; - sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX); + sregs.cr0 = kvm_get_default_cr0(); + sregs.cr4 |= kvm_get_default_cr4(); + sregs.efer |= kvm_get_default_efer(); kvm_seg_set_unusable(&sregs.ldt); kvm_seg_set_kernel_code_64bit(&sregs.cs); -- 2.51.0.rc1.193.gad69d77794-goog