From nobody Sun Sep 14 14:52:28 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 E0CE7285CAA for ; Thu, 4 Sep 2025 06:55:06 +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=1756968908; cv=none; b=uCkvQ9LekpACZOCPRh/MId5IiXX5mCOqWI9rxxkehdcDyQhjCfw85/C0tK0xM+p74FbWaAv5s7QwSl511nCCvu75H3cSNiSA2/utEuveAO4GRfvBkNqNzSfFz5Pz792TT/YZdhLhQLMRKIA8qYZFD1gTm+t6Zg7vius/XqmEoh8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756968908; c=relaxed/simple; bh=348b4OgRxCPZDt5zbD2zMnPjRA6DnidXFpSwvU+Q7T0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=WIq+E7Sebc94j2Y+IUJYW7whLBlDkkLDt75GQ9nPWgl7m5R4oJ7keKrMoToMrDlnm4TdlnqMAc+rmZddE/tJhCAmbaNyH4t+ZOJ2nQnvLRiYPLLwvHVcYmeVceWtr7OMbDo7WkyFo82kolDkqnCY4mHLUYHaL8gqymYKPd1/O4U= 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=Hqg7p1rh; 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="Hqg7p1rh" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-325b2959306so1286778a91.0 for ; Wed, 03 Sep 2025 23:55:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1756968906; x=1757573706; 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=vezJfUKCtxNWPm/VdLSVnM4sP+de00c6p544QQMtBnU=; b=Hqg7p1rhO/pp9pFDQrs/XZlVGnczm3Bvq91al0XdGMVsuWn1wlRKFU6Apq5XKMntCU gmqQkx4mNNFk3C4SkijiksIiu/Q86YE/YrrlGDz86HVA92Z9A3qKcVjDTG5YouOJq9gC 2tMbvYIGyT88UTP00E/1V0TPxR4LCEczs/hUobMKWG3SU73Vr1v0z7FlFnGhKaR2aMDq rZ6f3E980KfCv3rsbiDNJUmA9w4PYlP7nt2lVsBiiwm7YKI74XdQff6DXK3uUq4zsY4S oCJCQrp9m/slnx0w3aAs+Z/+ItaX6dbQ3dfyJsQIU4E8W+X5Fgp8chhGPEjLM+z1jABX Gprw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756968906; x=1757573706; 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=vezJfUKCtxNWPm/VdLSVnM4sP+de00c6p544QQMtBnU=; b=YJxiqeQI0GICxZ+iPCe8W4KJYFQpGIPBudMhfgDCKnhIixuca7dz8JQ4OhYv17fUFw OrobGqVKYD1HcU5VsikCjfX2+rmY1oKer2ddZFVG/z2afcYESHtLIK1S0kt2bPGP9tMT y4UsSu0SLfuODjbMGC+S6F24DTp/nTgH7+LOiuu1u8sXpC6dbatHT0Mrx0lHRXV8Zdgk RZyvtZFnKlfJg3RsxykNB9TiHweb8RYb/lxUkZSaEggLTSYrlJSv+6tf8SOmkAA70ieq m6+EfGOMhe88GQfWJzh2XHa123is7UDqoATS3eEVXchfJZiL8vha/e1xPSZBTbV6TRyh cWKA== X-Gm-Message-State: AOJu0YwGrxQw/5t7cnjwTTgl6SQtOkEXw3l5GbUWFZw2kih1SnL748bQ MqmiWCPwOdGuA80OftaOFSwl8O1y2y6eypEb09+LFNRNzoHxGIE6sLty4lvYd9koIyqs5o5IBW4 Myw== X-Google-Smtp-Source: AGHT+IHKFulWacx9Uc/kpwTFlpBhGdWU15nk+AKPjD6xyzys8McNW5qoCvcoYO9CJe7Y4Ge8I7kXM/rjWQ== X-Received: from pjboh15.prod.google.com ([2002:a17:90b:3a4f:b0:32b:827b:f76e]) (user=sagis job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:4aca:b0:329:cb75:fed7 with SMTP id 98e67ed59e1d1-329cb760ed6mr17044247a91.19.1756968906032; Wed, 03 Sep 2025 23:55:06 -0700 (PDT) Date: Wed, 3 Sep 2025 23:54:32 -0700 In-Reply-To: <20250904065453.639610-1-sagis@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250904065453.639610-1-sagis@google.com> X-Mailer: git-send-email 2.51.0.338.gd7d06c2dae-goog Message-ID: <20250904065453.639610-3-sagis@google.com> Subject: [PATCH v10 02/21] 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 Reviewed-by: Binbin Wu --- .../selftests/kvm/include/x86/processor.h | 33 +++++++++++++++++++ .../testing/selftests/kvm/lib/x86/processor.c | 12 +++---- 2 files changed, 38 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..f610c09cadf4 100644 --- a/tools/testing/selftests/kvm/include/x86/processor.h +++ b/tools/testing/selftests/kvm/include/x86/processor.h @@ -27,6 +27,10 @@ extern uint64_t guest_tsc_khz; #define MAX_NR_CPUID_ENTRIES 100 #endif =20 +#ifndef NUM_INTERRUPTS +#define NUM_INTERRUPTS 256 +#endif + #define NONCANONICAL 0xaaaaaaaaaaaaaaaaull =20 /* Forced emulation prefix, used to invoke the emulator unconditionally. */ @@ -1456,4 +1460,33 @@ void virt_map_level(struct kvm_vm *vm, uint64_t vadd= r, uint64_t paddr, =20 bool sys_clocksource_is_based_on_tsc(void); =20 +static inline uint16_t kvm_get_default_idt_limit(void) +{ + return NUM_INTERRUPTS * sizeof(struct idt_entry) - 1; +} + +static inline uint16_t kvm_get_default_gdt_limit(void) +{ + return getpagesize() - 1; +} + +static inline uint64_t kvm_get_default_cr0(void) +{ + return X86_CR0_PE | X86_CR0_NE | X86_CR0_PG; +} + +static inline 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; +} + +static inline uint64_t kvm_get_default_efer(void) +{ + return EFER_LME | EFER_LMA | EFER_NX; +} + #endif /* SELFTEST_KVM_PROCESSOR_H */ diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testin= g/selftests/kvm/lib/x86/processor.c index d4c19ac885a9..83efcf48faad 100644 --- a/tools/testing/selftests/kvm/lib/x86/processor.c +++ b/tools/testing/selftests/kvm/lib/x86/processor.c @@ -498,15 +498,13 @@ 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 2.51.0.338.gd7d06c2dae-goog