From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
x86@kernel.org, "Kenneth R . Crudup" <kenny@panix.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Xiaoyao Li <xiaoyao.li@intel.com>, Nadav Amit <namit@vmware.com>,
Thomas Hellstrom <thellstrom@vmware.com>,
Tony Luck <tony.luck@intel.com>, Jessica Yu <jeyu@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] KVM: VMX: Extend VMX's #AC interceptor to handle split lock #AC in guest
Date: Thu, 2 Apr 2020 22:48:16 +0200 [thread overview]
Message-ID: <20200402204816.GJ2452@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <87h7y1mz2s.fsf@nanos.tec.linutronix.de>
On Thu, Apr 02, 2020 at 10:07:07PM +0200, Thomas Gleixner wrote:
If we're doing wish lists, I have one more ;-)
> TBH, the more I learn about this, the more I tend to just give up on
> this whole split lock stuff in its current form and wait until HW folks
> provide something which is actually usable:
>
> - Per thread
> - Properly distinguishable from a regular #AC via error code
- is an actual alignment check.
That is, disallow all unaligned LOCK prefixed ops, not just those that
happen to straddle a cacheline.
next prev parent reply other threads:[~2020-04-02 20:48 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200402124205.334622628@linutronix.de>
2020-04-02 15:55 ` [PATCH 0/3] x86: KVM: VMX: Add basic split-lock #AC handling Sean Christopherson
2020-04-02 15:55 ` [PATCH 1/3] KVM: x86: Emulate split-lock access as a write in emulator Sean Christopherson
2020-04-02 15:55 ` [PATCH 2/3] x86/split_lock: Refactor and export handle_user_split_lock() for KVM Sean Christopherson
2020-04-02 17:01 ` Thomas Gleixner
2020-04-02 17:19 ` Sean Christopherson
2020-04-02 19:06 ` Thomas Gleixner
2020-04-10 4:39 ` Xiaoyao Li
2020-04-10 10:21 ` Paolo Bonzini
2020-04-02 15:55 ` [PATCH 3/3] KVM: VMX: Extend VMX's #AC interceptor to handle split lock #AC in guest Sean Christopherson
2020-04-02 17:19 ` Thomas Gleixner
2020-04-02 17:40 ` Sean Christopherson
2020-04-02 20:07 ` Thomas Gleixner
2020-04-02 20:36 ` Andy Lutomirski
2020-04-02 20:48 ` Peter Zijlstra [this message]
2020-04-02 20:51 ` Sean Christopherson
2020-04-02 22:27 ` Thomas Gleixner
2020-04-02 22:40 ` Nadav Amit
2020-04-02 23:03 ` Thomas Gleixner
2020-04-02 23:08 ` Steven Rostedt
2020-04-02 23:16 ` Kenneth R. Crudup
2020-04-02 23:18 ` Jim Mattson
2020-04-03 12:16 ` Thomas Gleixner
2020-04-10 10:23 ` [PATCH 0/3] x86: KVM: VMX: Add basic split-lock #AC handling Paolo Bonzini
2020-04-10 11:14 ` Thomas Gleixner
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