From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227CYmbzU3FAaA26xF0FUD8XFCBVlAEPDQBOJcCRP1gLGGUwawX7+gUvgTW+SCA6QTictG9P ARC-Seal: i=1; a=rsa-sha256; t=1517491574; cv=none; d=google.com; s=arc-20160816; b=Vgf5kZBXYcAwT7V3GwCPBRLhGr6wNQVb/CJWcojRMGC05bhvd/FBNtnxNpee1wB0+L ajkmzhU1JTkLlIl7GNEdzKCBqvy5f2qrmCPFYU/pWztVPr9nY4AyZYk+UPX5s3jNkKEn YcxqouxZTKx4GpHBoKntUyptxlC9mUkmBs0ae7UVgxlPfpxwkfnf+ICjdx7uFlnC0qXi OK/1bcTCj+TARRUYAq7gu2ydFxALrljjpN2J6AuD2f/mT2I3fKMI2HuI3xjZAH1ygwAR iNriLTNXAI4jJ8DQfpBSBbUtLJDF/7+db8cjAJe0GatqvCJ/TUswu1QctEHZlntlfDqT FWMw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:date:face:references:in-reply-to:cc:to:from:subject :message-id:dkim-signature:arc-authentication-results; bh=rqXOXGBPGPo+j5sPWE+4VCwhPhHOUOHogdyHri+otdE=; b=p0jvQsHRPZ1WUyL2GIUDqyzLWMEps3L7ZfE7FQIhj7zLTDRXoSaC5xjHa5lT8TpKvk 5jRZ7idEGk/RvRraX7wK7mJgLAY/eekVo1oQ+oVeJRLUJ5ss4guWO+aWgfj2UZ7CX4HF ZmDUxuJO0M4b6SaA//kauooG/lpZI08zbA4S8DWjecI2o2U5eaS9Yy9nfaaN/zj5nPUx txutjrelDrxwfqNrMrLk1HAPK5vr0dD9NbVyHq7sgIAKlhxSLjCBR+pLqcuLfQqe+gu2 eqcoZrD3QEAb8CcqIthqVe4y5GAbQHa3FXMziEaQ2HVUUver8coouLqZIfnao1HMGW0A QnAQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=bSxjjtB6; spf=pass (google.com: best guess record for domain of batv+b6d91b464d3481d21e9d+5275+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+b6d91b464d3481d21e9d+5275+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=bSxjjtB6; spf=pass (google.com: best guess record for domain of batv+b6d91b464d3481d21e9d+5275+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+b6d91b464d3481d21e9d+5275+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1517491537.18619.307.camel@infradead.org> Subject: Re: [PATCH v5 4/5] KVM: VMX: Allow direct access to MSR_IA32_SPEC_CTRL From: David Woodhouse To: Konrad Rzeszutek Wilk , KarimAllah Ahmed Cc: Jim Mattson , KarimAllah Ahmed , kvm list , LKML , the arch/x86 maintainers , Asit Mallick , Arjan Van De Ven , Dave Hansen , Andi Kleen , Andrea Arcangeli , Linus Torvalds , Tim Chen , Thomas Gleixner , Dan Williams , Jun Nakajima , Paolo Bonzini , Greg KH , Andy Lutomirski , Ashok Raj In-Reply-To: <20180201042650.GD21751@char.us.oracle.com> References: <1517427467-28567-1-git-send-email-karahmed@amazon.de> <1517427467-28567-5-git-send-email-karahmed@amazon.de> <06cb88da-f355-41ed-380f-7daa8ddf6159@amazon.com> <20180201042650.GD21751@char.us.oracle.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-/On8HurXBdQRwJwoFA39" Date: Thu, 01 Feb 2018 13:25:37 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1591113692084885209?= X-GMAIL-MSGID: =?utf-8?q?1591205245915905515?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-/On8HurXBdQRwJwoFA39 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-01-31 at 23:26 -0500, Konrad Rzeszutek Wilk wrote: >=20 > > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c > > index 6a9f4ec..bfc80ff 100644 > > --- a/arch/x86/kvm/vmx.c > > +++ b/arch/x86/kvm/vmx.c > > @@ -594,6 +594,14 @@ struct vcpu_vmx { > >=C2=A0 #endif > >=C2=A0=C2=A0 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u64=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 arch_capabilities; > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u64=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 sp= ec_ctrl; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * This indicates that: > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * 1) guest_cpuid_has(X86_FEATURE_IBRS) = =3D=3D true && > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * 2) The guest has actually initiated a= write against the MSR. > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0bool spec_ctrl_used; > >=C2=A0=C2=A0 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * This indicates that: Thanks for persisting with the details here, Karim. In addition to Konrad's heckling at the comments, I'll add my own request to his... I'd like the comment for spec_ctrl_used to explain why it isn't entirely redundant with the spec_ctrl_intercepted() function. Without nesting, I believe it *would* be redundant, but the difference comes when an L2 is running for which L1 has not permitted the MSR to be passed through. That's when we have spec_ctrl_used =3D true but the MSR *isn't* actually passed through in the active msr_bitmap. Question: if spec_ctrl_used is always equivalent to the intercept bit in the vmcs01.msr_bitmap, just not the guest bitmap... should we ditch it and always use the bit from the vmcs01.msr_bitmap? 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