From nobody Mon Feb 9 00:54:56 2026 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (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 2FC651CBA04 for ; Thu, 28 Nov 2024 01:35:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732757752; cv=none; b=jh+I8PO8Rm2kiOXgBJO6lyzyWEyHUJJhXuC2Hxp3xiAxRgTDefbSBTogxiafU7mOArjjYm3kw8zr1EysKan16DhsKEQHEpPvxiRJhTDqivBHdHFNm4qqGcIVoK0FY0SBQ8prMsmLk/AOaJ3QBK+JLiZGuPEJvMIrkAQnnF/Mn6s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732757752; c=relaxed/simple; bh=h1o6xxhiRsATofWeY4XS6nAFlEHdA1rnXtEd6OclfKY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=uo1oyyUsufDr4NyOzNycsmldlNpB/3Im4mqN9yuTuSQRHmz9MHCrSfHm1b412NKJiwHAgIEIKIbOLVikHL/KzVholuw+Z9nHeObDpJsKNlBZLsumSlzE/e6FzByqrrYSxabfLuWZHfTyBo5rRr/Ik18vh/v8LZrPWJE9nHgNrWY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=Fy792BiM; arc=none smtp.client-ip=209.85.216.73 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--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Fy792BiM" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-2edeef8a994so388399a91.2 for ; Wed, 27 Nov 2024 17:35:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1732757750; x=1733362550; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=vAP/rVhh2wy/ZcCYWV8qgeX607Ed3+jPmDcr0A7awL4=; b=Fy792BiMDJZMRmKcdsu0qJrDRwm/llELagsCUuiCMpTpyNN/ldQe9bVND59wtVoWPN lSsuB/JV6S5D0N6YppCnutblHAXz2954bTN05ojcTSKHolRjOMHJpp6Lmf1cynRjGuh9 V13dHcyfulM/BVOD1wqLCfKNknBVhGnUWT7Gi1dBQoiW4KtKgEeLkciSad7FAJs7XBI4 ZWWU92rKEBxHNdy6FUBer13s16mqNQEKnQOOfhqMG+JzvzJIJXG6tPN+eUyzAqWSQLZf dJ0foxooMOq9EwKxHiERutv6ZHwNWe3jsSG2lwWupDQ16rn3gM+MqCPwHz4Zw4kVBORO olPg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732757750; x=1733362550; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=vAP/rVhh2wy/ZcCYWV8qgeX607Ed3+jPmDcr0A7awL4=; b=FIYmfLR1u6FC0SqqvRgIyyFiiwpHvWueQFHlr6+B6i84OsyRA7Yecje7iaVkqpziJZ //yzM85shFmigQW+EehKn2EGKCgWrmMPm8V9nwBs04vvfZkAjOAeF3lEBQnyR2s8bZCu EJJuX/aoX9/LT7yDGMff0peUCWD32S6HRqDRxrfX33w/xhq0UILO8W0NAh78XkS5CARF b5SpjhU3g6eGBMyNXv/BjDCtw8Aoa/YQ0ZtQcmbxkOAAi3p2Tm/Xf7Xf9Hz5h+Bz8J4t 46Qflo97380qWz0WOjV6LM/H3YwBUcv+/3UE9h3RuhPyRS5uzKySsQ6kEx2mnpEqI40E NSrg== X-Forwarded-Encrypted: i=1; AJvYcCWuzg38ASLHLuBCm4Cj+Y966HQkzctt/pYKrP4UuDrwyCyn6AfNVVdO215U+USa8iY9sUXv7EOKGDSPYZM=@vger.kernel.org X-Gm-Message-State: AOJu0Yw/o+dzpBAFJ4SBveT5H5ftlqNzrzyq8sPdblsiNONz84r2hLhW Se3XcD8fNHtmMwGn19fpEsyAP5H2I2udqFYxTcfKMnVLBC05B+BzBvzUfRvEugh6ycGhqmmgp/o P1g== X-Google-Smtp-Source: AGHT+IH4S299/Qme5T+EzZT4W2pDSlPNgfKHdrqsbTxhkEGzPyX9GiJRIR7nFXLTy67066kc1KKNhDPc3pM= X-Received: from pjuj11.prod.google.com ([2002:a17:90a:d00b:b0:2ea:7d73:294e]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:380c:b0:2ea:c096:b738 with SMTP id 98e67ed59e1d1-2ee097bafaemr5779058a91.28.1732757750554; Wed, 27 Nov 2024 17:35:50 -0800 (PST) Reply-To: Sean Christopherson Date: Wed, 27 Nov 2024 17:34:12 -0800 In-Reply-To: <20241128013424.4096668-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241128013424.4096668-1-seanjc@google.com> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Message-ID: <20241128013424.4096668-46-seanjc@google.com> Subject: [PATCH v3 45/57] KVM: x86: Avoid double CPUID lookup when updating MWAIT at runtime From: Sean Christopherson To: Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Jarkko Sakkinen Cc: kvm@vger.kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, Maxim Levitsky , Hou Wenlong , Xiaoyao Li , Kechen Lu , Oliver Upton , Binbin Wu , Yang Weijiang , Robert Hoo Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Move the handling of X86_FEATURE_MWAIT during CPUID runtime updates to utilize the lookup done for other CPUID.0x1 features. No functional change intended. Reviewed-by: Maxim Levitsky Signed-off-by: Sean Christopherson --- arch/x86/kvm/cpuid.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 8015d6b52a69..16cfa839e734 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -283,6 +283,11 @@ void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu) =20 cpuid_entry_change(best, X86_FEATURE_APIC, vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE); + + if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT)) + cpuid_entry_change(best, X86_FEATURE_MWAIT, + vcpu->arch.ia32_misc_enable_msr & + MSR_IA32_MISC_ENABLE_MWAIT); } =20 best =3D kvm_find_cpuid_entry_index(vcpu, 7, 0); @@ -298,14 +303,6 @@ void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu) if (best && (cpuid_entry_has(best, X86_FEATURE_XSAVES) || cpuid_entry_has(best, X86_FEATURE_XSAVEC))) best->ebx =3D xstate_required_size(vcpu->arch.xcr0, true); - - if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT)) { - best =3D kvm_find_cpuid_entry(vcpu, 0x1); - if (best) - cpuid_entry_change(best, X86_FEATURE_MWAIT, - vcpu->arch.ia32_misc_enable_msr & - MSR_IA32_MISC_ENABLE_MWAIT); - } } EXPORT_SYMBOL_GPL(kvm_update_cpuid_runtime); =20 --=20 2.47.0.338.g60cca15819-goog