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From: "Van De Ven, Arjan" <arjan.van.de.ven@intel.com>
To: Andy Lutomirski <luto@kernel.org>,
	"Hansen, Dave" <dave.hansen@intel.com>
Cc: "Raj, Ashok" <ashok.raj@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Greg KH <gregkh@linuxfoundation.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	"Andi Kleen" <ak@linux.intel.com>,
	David Woodhouse <dwmw@amazon.co.uk>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Williams, Dan J" <dan.j.williams@intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	"Nakajima, Jun" <jun.nakajima@intel.com>,
	"Mallick, Asit K" <asit.k.mallick@intel.com>
Subject: RE: [PATCH 1/5] x86/ibrs: Introduce native_rdmsrl, and native_wrmsrl
Date: Sat, 13 Jan 2018 13:52:24 +0000	[thread overview]
Message-ID: <0575AF4FD06DD142AD198903C74E1CC87A5C7FB4@FMSMSX151.amr.corp.intel.com> (raw)
In-Reply-To: <CALCETrVSCTO_VBzngZNgiCoRwKZiBa72r9z4_A-R5CAdmqi6Lg@mail.gmail.com>


> > We were also worried about the indirect calls that are part of the
> > paravirt interfaces when retpolines are not in place.
> >
> 
> How could those possibly be any worse than any other indirect call in
> the kernel?

they're worse if they happen before you write the MSR that then protects them?

  reply	other threads:[~2018-01-13 13:52 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-12  1:32 [PATCH 0/5] Add support for IBRS & IBPB KVM support Ashok Raj
2018-01-12  1:32 ` [PATCH 1/5] x86/ibrs: Introduce native_rdmsrl, and native_wrmsrl Ashok Raj
2018-01-12  1:41   ` Andy Lutomirski
2018-01-12  1:52     ` Raj, Ashok
2018-01-12  2:20       ` Andy Lutomirski
2018-01-12  3:01         ` Raj, Ashok
2018-01-12  5:03           ` Dave Hansen
2018-01-12 16:28             ` Josh Poimboeuf
2018-01-12 16:28             ` Woodhouse, David
2018-01-13  6:20             ` Andy Lutomirski
2018-01-13 13:52               ` Van De Ven, Arjan [this message]
2018-01-13 15:20                 ` Andy Lutomirski
2018-01-13  6:19           ` Andy Lutomirski
2018-01-12  7:54   ` Greg KH
2018-01-12 12:28   ` Borislav Petkov
2018-01-12  1:32 ` [PATCH 2/5] x86/ibrs: Add new helper macros to save/restore MSR_IA32_SPEC_CTRL Ashok Raj
2018-01-12  1:32 ` [PATCH 3/5] x86/ibrs: Add direct access support for MSR_IA32_SPEC_CTRL Ashok Raj
2018-01-12  1:58   ` Dave Hansen
2018-01-12  3:14     ` Raj, Ashok
2018-01-12  9:51     ` Peter Zijlstra
2018-01-12 10:09       ` David Woodhouse
2018-01-15 13:45         ` Peter Zijlstra
2018-01-15 13:59           ` David Woodhouse
2018-01-15 14:45             ` Peter Zijlstra
2018-01-12  1:32 ` [PATCH 4/5] x86/svm: Direct access to MSR_IA32_SPEC_CTRL Ashok Raj
2018-01-12  7:23   ` David Woodhouse
2018-01-12  9:58     ` Peter Zijlstra
2018-01-12 10:13       ` David Woodhouse
2018-01-12 12:38   ` Paolo Bonzini
2018-01-12 15:14   ` Tom Lendacky
2018-01-12  1:32 ` [PATCH 5/5] x86/feature: Detect the x86 feature Indirect Branch Prediction Barrier Ashok Raj
2018-01-12 10:08   ` Peter Zijlstra
2018-01-12 12:32   ` Borislav Petkov
2018-01-12 12:39     ` Woodhouse, David
2018-01-12 15:21       ` Tom Lendacky
2018-01-12 15:31   ` Tom Lendacky
2018-01-12 15:36     ` Woodhouse, David
2018-01-12 17:06       ` Tom Lendacky
2018-02-01 21:59 [PATCH v6 0/5] KVM: Expose speculation control feature to guests KarimAllah Ahmed
2018-02-01 21:59 ` KarimAllah Ahmed
2018-02-01 21:59 ` [PATCH v6 1/5] KVM: x86: Update the reverse_cpuid list to include CPUID_7_EDX KarimAllah Ahmed
2018-02-02 17:37   ` Jim Mattson
2018-02-03 22:50   ` [tip:x86/pti] KVM/x86: " tip-bot for KarimAllah Ahmed
2018-02-01 21:59 ` [PATCH v6 2/5] KVM: x86: Add IBPB support KarimAllah Ahmed
2018-02-02 17:49   ` Konrad Rzeszutek Wilk
2018-02-02 18:02     ` David Woodhouse
2018-02-02 18:02       ` David Woodhouse
2018-02-02 19:56       ` Konrad Rzeszutek Wilk
2018-02-02 20:16         ` David Woodhouse
2018-02-02 20:16           ` David Woodhouse
2018-02-02 20:28           ` Konrad Rzeszutek Wilk
2018-02-02 20:31             ` David Woodhouse
2018-02-02 20:31               ` David Woodhouse
2018-02-02 20:52               ` Konrad Rzeszutek Wilk
2018-02-02 20:52             ` Alan Cox
2018-02-05 19:22               ` Paolo Bonzini
2018-02-05 19:24             ` Paolo Bonzini
2018-02-03 22:50   ` [tip:x86/pti] KVM/x86: " tip-bot for Ashok Raj
2018-02-16  3:44   ` [PATCH v6 2/5] KVM: x86: " Jim Mattson
2018-02-16  4:22     ` Andi Kleen
2018-05-03  1:27   ` Wanpeng Li
2018-05-03  9:19     ` Paolo Bonzini
2018-05-03 12:01       ` Wanpeng Li
2018-05-03 12:46       ` Tian, Kevin
2018-02-01 21:59 ` [PATCH v6 3/5] KVM: VMX: Emulate MSR_IA32_ARCH_CAPABILITIES KarimAllah Ahmed
2018-02-02 10:53   ` Darren Kenny
2018-02-02 17:35     ` Jim Mattson
2018-02-02 17:51   ` Konrad Rzeszutek Wilk
2018-02-03 22:51   ` [tip:x86/pti] KVM/VMX: " tip-bot for KarimAllah Ahmed
2018-02-01 21:59 ` [PATCH v6 4/5] KVM: VMX: Allow direct access to MSR_IA32_SPEC_CTRL KarimAllah Ahmed
2018-02-02 11:03   ` Darren Kenny
2018-02-02 11:27   ` David Woodhouse
2018-02-02 11:27     ` David Woodhouse
2018-02-02 17:53   ` Konrad Rzeszutek Wilk
2018-02-02 18:05     ` David Woodhouse
2018-02-02 18:19       ` Konrad Rzeszutek Wilk
2018-02-02 17:57   ` Jim Mattson
2018-02-03 22:51   ` [tip:x86/pti] KVM/VMX: " tip-bot for KarimAllah Ahmed
2018-02-01 21:59 ` [PATCH v6 5/5] KVM: SVM: " KarimAllah Ahmed
2018-02-02 11:06   ` Darren Kenny
2018-02-02 18:02   ` Konrad Rzeszutek Wilk

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