From: Andy Lutomirski <luto@kernel.org>
To: "Moger, Babu" <Babu.Moger@amd.com>
Cc: "tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"bp@alien8.de" <bp@alien8.de>, "hpa@zytor.com" <hpa@zytor.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"rkrcmar@redhat.com" <rkrcmar@redhat.com>,
"sean.j.christopherson@intel.com"
<sean.j.christopherson@intel.com>,
"vkuznets@redhat.com" <vkuznets@redhat.com>,
"wanpengli@tencent.com" <wanpengli@tencent.com>,
"jmattson@google.com" <jmattson@google.com>,
"x86@kernel.org" <x86@kernel.org>,
"joro@8bytes.org" <joro@8bytes.org>,
"luto@kernel.org" <luto@kernel.org>,
"zohar@linux.ibm.com" <zohar@linux.ibm.com>,
"yamada.masahiro@socionext.com" <yamada.masahiro@socionext.com>,
"nayna@linux.ibm.com" <nayna@linux.ibm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [PATCH 2/4] kvm: svm: Enable UMIP feature on AMD
Date: Fri, 1 Nov 2019 11:24:05 -0700 [thread overview]
Message-ID: <CALCETrUSjbjt=U6OpTFXEZsEJQ6zjcqCeqi6nSFOi=rN91zWmg@mail.gmail.com> (raw)
In-Reply-To: <157262962352.2838.15656190309312238595.stgit@naples-babu.amd.com>
On Fri, Nov 1, 2019 at 10:33 AM Moger, Babu <Babu.Moger@amd.com> wrote:
>
> AMD 2nd generation EPYC processors support UMIP (User-Mode Instruction
> Prevention) feature. The UMIP feature prevents the execution of certain
> instructions if the Current Privilege Level (CPL) is greater than 0.
> If any of these instructions are executed with CPL > 0 and UMIP
> is enabled, then kernel reports a #GP exception.
>
> The idea is taken from articles:
> https://lwn.net/Articles/738209/
> https://lwn.net/Articles/694385/
>
> Enable the feature if supported on bare metal and emulate instructions
> to return dummy values for certain cases.
What are these cases?
next prev parent reply other threads:[~2019-11-01 18:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-01 17:33 [PATCH 0/4] Emulate and enable UMIP feature on AMD Moger, Babu
2019-11-01 17:33 ` [PATCH 1/4] kvm: x86: Dont set UMIP feature bit unconditionally Moger, Babu
2019-11-01 18:35 ` Jim Mattson
2019-11-01 19:39 ` Moger, Babu
2019-11-01 19:42 ` Jim Mattson
2019-11-01 17:33 ` [PATCH 2/4] kvm: svm: Enable UMIP feature on AMD Moger, Babu
2019-11-01 18:24 ` Andy Lutomirski [this message]
2019-11-01 18:38 ` Moger, Babu
2019-11-01 19:09 ` Andy Lutomirski
2019-11-01 18:29 ` Jim Mattson
2019-11-01 19:20 ` Moger, Babu
2019-11-01 19:24 ` Andy Lutomirski
2019-11-01 20:04 ` Moger, Babu
2019-11-01 20:08 ` Jim Mattson
2019-11-02 19:23 ` Moger, Babu
2019-11-03 11:45 ` Borislav Petkov
2019-11-04 18:46 ` Moger, Babu
2019-11-04 11:54 ` Paolo Bonzini
2019-11-04 18:45 ` Moger, Babu
2019-11-01 17:33 ` [PATCH 3/4] kvm: svm: Emulate UMIP instructions on non SEV guest Moger, Babu
2019-11-01 17:34 ` [PATCH 4/4] x86/Kconfig: Rename UMIP config parameter Moger, Babu
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