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From: Babu Moger <babu.moger@amd.com>
To: pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de
Cc: fenghua.yu@intel.com, tony.luck@intel.com, wanpengli@tencent.com,
	kvm@vger.kernel.org, thomas.lendacky@amd.com,
	peterz@infradead.org, seanjc@google.com, joro@8bytes.org,
	x86@kernel.org, kyung.min.park@intel.com,
	linux-kernel@vger.kernel.org, krish.sadhukhan@oracle.com,
	hpa@zytor.com, mgross@linux.intel.com, vkuznets@redhat.com,
	kim.phillips@amd.com, wei.huang2@amd.com, jmattson@google.com
Subject: [PATCH v2 0/2] x86: Add the feature Virtual SPEC_CTRL
Date: Tue, 22 Dec 2020 16:31:26 -0600	[thread overview]
Message-ID: <160867624053.3471.7106539070175910424.stgit@bmoger-ubuntu> (raw)

Newer AMD processors have a feature to virtualize the use of the
SPEC_CTRL MSR on the guest. The series adds the feature support
and enables the feature on SVM.
  NOTE: This is not final yet. Sending out the patches to make
  sure I captured all the comments correctly.

  1. Most of the changes are related to Jim and Sean's feedback.
  2. Improved the description of patch #2.
  3. Updated the vmcb save area's guest spec_ctrl value(offset 0x2E0)
     properly. Initialized during init_vmcb and svm_set_msr and
     returned the value from save area for svm_get_msr.
  4. As Jim commented, transferred the value into the VMCB prior
     to VMRUN and out of the VMCB after #VMEXIT.
  5. Added kvm-unit-test to detect the SPEC CTRL feature.
  6. Sean mantioned of renaming MSR_AMD64_VIRT_SPEC_CTRL. But, it might
     create even more confusion, so dropped the idea for now.



Babu Moger (2):
      x86/cpufeatures: Add the Virtual SPEC_CTRL feature
      KVM: SVM: Add support for Virtual SPEC_CTRL

 arch/x86/include/asm/cpufeatures.h |    1 +
 arch/x86/include/asm/svm.h         |    4 +++-
 arch/x86/kvm/svm/svm.c             |   29 +++++++++++++++++++++++++----
 3 files changed, 29 insertions(+), 5 deletions(-)


             reply	other threads:[~2020-12-22 22:32 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-22 22:31 Babu Moger [this message]
2020-12-22 22:31 ` [PATCH v2 1/2] x86/cpufeatures: Add the Virtual SPEC_CTRL feature Babu Moger
2020-12-30  7:15   ` Borislav Petkov
2020-12-22 22:31 ` [PATCH v2 2/2] KVM: SVM: Add support for Virtual SPEC_CTRL Babu Moger
2020-12-30  7:15   ` Borislav Petkov
2020-12-30 16:08     ` Sean Christopherson
2021-01-04 18:37       ` Babu Moger
2021-01-04 15:47   ` Tom Lendacky
2021-01-04 18:35     ` Babu Moger

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