From: "Moger, Babu" <Babu.Moger@amd.com>
To: "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>
Cc: "x86@kernel.org" <x86@kernel.org>,
"joro@8bytes.org" <joro@8bytes.org>,
"Moger, Babu" <Babu.Moger@amd.com>,
"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: [PATCH 0/4] Emulate and enable UMIP feature on AMD
Date: Fri, 1 Nov 2019 17:33:30 +0000 [thread overview]
Message-ID: <157262960837.2838.17520432516398899751.stgit@naples-babu.amd.com> (raw)
AMD 2nd generation EPYC processors support UMIP (User-Mode Instruction
Prevention) feature. Emulate and enable the UMIP feature if bare metal
supports it. Emulation of UMIP instructions (sgdt, sidt, sldt, smsw and
str) requires the hypervisor to read and write the guest memory. Guest
memory is encrypted on SEV guest. Hypervisor cannot successfully read or
write the guest memory. So disable emulation on SEV guest. Enable the
emulation only on non SEV guest.
Tested on EPYC/EPYC-Rome VMs and works as expected. Please review.
Babu Moger (4):
kvm: x86: Dont set UMIP feature bit unconditionally
kvm: svm: Enable UMIP feature on AMD
kvm: svm: Emulate UMIP instructions on non SEV guest
x86/Kconfig: Rename UMIP config parameter
arch/x86/Kconfig | 8 +++----
arch/x86/include/asm/disabled-features.h | 2 +-
arch/x86/include/asm/umip.h | 4 ++--
arch/x86/kernel/Makefile | 2 +-
arch/x86/kvm/cpuid.c | 2 +-
arch/x86/kvm/svm.c | 30 ++++++++++++++++++++----
6 files changed, 34 insertions(+), 14 deletions(-)
--
2.20.1
next reply other threads:[~2019-11-01 17:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-01 17:33 Moger, Babu [this message]
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
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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