From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 D7DB7480350 for ; Tue, 7 Jul 2026 21:56:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783461367; cv=none; b=IqwHfe6uSmduaCWGNWckUB1Fq6uzKnaJXkGPL6RjNeQPE0BMvTAGkWyBkvE4WGwqWlBh8Z4fz5mJTFrXn6Sflv5gWtFHrhfLnmS/k59qL0HzucAZqB3wq2LzIz8lxl5/89P23PUmHzl6DY8FZAVVYEeupfknhqw3nxjqhNgvu/w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783461367; c=relaxed/simple; bh=lcSX7wCiKhMfn9Aj2tF8/IHgpw9MSCDR5lmvSzHU4ng=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=seyrzkANQRsLYCTCCHT8neltUk5ud08l8JXforz7mRZ+NfGnuClFa9YNGI4+gcCBSPMw9jGCTbr3IM1mK9STAE4UGZG0PlhPGBnFxgtAMHbt5/V3RFudehc+ZSY7oDcWdgoFzPJyNflsrSM2TpXlMt/4QCB0G4sx7QrzEf0nidQ= 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=NwkQML4X; arc=none smtp.client-ip=209.85.214.202 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="NwkQML4X" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-2cca5e0a0c9so1371365ad.1 for ; Tue, 07 Jul 2026 14:56:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1783461365; x=1784066165; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=p0hWbsqrGNSQLEq0KyayeGwYCXe9bS5W8pXklldJ77o=; b=NwkQML4XFFQcFoUNtS1sar97inP9HbbArSCwb/xJ7qsjln4Gch8hHLOOIgypXwJ2pK pa6R7ZArwGEtUBEQ8o4qgMVnt/MeUzGoEQYZ7/on5hTv4p4vb8JSp+lenmUIDjSbXZPX zL05eRJK23xNULdqq61mRdiaohPanzQfNpyuX2QA2Bb328X5OWsGDDDTME/X7Ec8aqFT xizOw5ciG+FOk7Ft+wMTVUXNFYRLoOq0zP9EI++uJ10YqKfDvvwmHwxRHDe32SBIcpyX 7ynMWplJb1KpsHtE03ygniBdb2KdjRB6BlCpwnmMoQvmjRgjcU6TCIpaKHkrOr8GFzFU ICjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783461365; x=1784066165; h=content-type: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:content-type; bh=p0hWbsqrGNSQLEq0KyayeGwYCXe9bS5W8pXklldJ77o=; b=iDvu06NjQM30gcylZMbQMk8bdUx+8OUNEcxq+Ak13BGPIZvFoQx+uW7liFKi2aUlpi 5MsShDyxAf8nxnOKnBnCBgZLrGR97QNZk9CGeB4I+feX1XE3nB9YWUw8scnItoFAaFd5 Il9O4otniOENYg9Uy70KylK4rM1MjwJeno+hSWLvbTTHN5kIxhMmcfy5iMjAGMZg5giG 3dGSZjigeT8RE0nMe4qtqZ+IvAIIjJr3u3aMkcXpDH0CBnLfaFKbCi180frulLj8WNQ2 qSUFjYc/dytBn5zPO6dJ8KDlcO7CSSmBKfKgYhTzOJk7SqNfm6NwSG63fyC4CzWCu/2G scPw== X-Forwarded-Encrypted: i=1; AHgh+RoP3JhXJGU2G52Cxjheonk99jIR4tQxE+MPX/i37TRHD6fAUsFFBvlBiBP2F7lstDXPEzR97gXhV5xbyQk=@vger.kernel.org X-Gm-Message-State: AOJu0YwmWcAw2sQNuvbDYG0q/9RjhWW34x4Q7v0gWzB1X5AnF7+zK270 YCuArxWzsEL2bx6L0Pnig7+vSNEl9ZgD1OHD3gecInTpI8huuLjq/famPIZ+A6KHoIGWDADqAOe 7yIErgw== X-Received: from plck21.prod.google.com ([2002:a17:902:f295:b0:2cc:79e2:e717]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:e84f:b0:2ca:64d3:f0da with SMTP id d9443c01a7336-2ccbf06b525mr64867165ad.32.1783461364987; Tue, 07 Jul 2026 14:56:04 -0700 (PDT) Date: Tue, 7 Jul 2026 14:56:04 -0700 In-Reply-To: <20260706195413.1966458-5-yosry@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260706195413.1966458-1-yosry@kernel.org> <20260706195413.1966458-5-yosry@kernel.org> Message-ID: Subject: Re: [PATCH v2 4/7] KVM: x86: Add a per-vendor callback to setup EFER caps From: Sean Christopherson To: Yosry Ahmed Cc: Paolo Bonzini , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" On Mon, Jul 06, 2026, Yosry Ahmed wrote: > Move handling EFER.SVME and EFER.LMSLE from hardware setup to a new > optional per-vendor callback invoked from kvm_setup_efer_caps(). This > centralizes allowed EFER bits handling to kvm_setup_efer_caps(), > facilitating following changes to move efer_reserved_bits into kvm_caps. > > Move the call to kvm_setup_efer_caps() after per-vendor ops are > initialized. Why? > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index a0b2c40d93c21..a297a77469b38 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -6903,6 +6903,8 @@ static void kvm_setup_efer_caps(void) > > if (kvm_cpu_cap_has(X86_FEATURE_AUTOIBRS)) > kvm_enable_efer_bits(EFER_AUTOIBRS); > + > + kvm_x86_call(setup_efer_caps)(); I would rather move the togging to kvm_setup_efer_caps(), e.g. static void kvm_setup_efer_caps(void) { /* Enable syscall by default because its emulated by KVM */ kvm_caps.supported_efer_bits = (u64)EFER_SCE; if (kvm_cpu_cap_has(X86_FEATURE_LM)) kvm_caps.supported_efer_bits |= (EFER_LME | EFER_LMA); if (kvm_cpu_cap_has(X86_FEATURE_NX)) kvm_caps.supported_efer_bits |= EFER_NX; if (kvm_cpu_cap_has(X86_FEATURE_FXSR_OPT)) kvm_caps.supported_efer_bits |= EFER_FFXSR; if (kvm_cpu_cap_has(X86_FEATURE_AUTOIBRS)) kvm_caps.supported_efer_bits |= EFER_AUTOIBRS; if (kvm_cpu_cap_has(X86_FEATURE_SVM)) { kvm_caps.supported_efer_bits |= EFER_SVME; if (!boot_cpu_has(X86_FEATURE_EFER_LMSLE_MBZ)) kvm_caps.supported_efer_bits |= EFER_LMSLE; } }