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Subject[RFC PATCH v4 0/8] This patch-set is to enable Guest CET support
Date
Control-flow Enforcement Technology (CET) provides protection against
return/jump-oriented programming (ROP) attacks. To make kvm Guest OS own
the capability, this patch-set is required. It enables CET related CPUID
report, xsaves/xrstors, vmx entry configuration etc. for Guest OS.

PATCH 1 : Define CET VMCS fields and bits.
PATCH 2/3 : Report CET feature support in CPUID.
PATCH 4 : Fix xsaves size calculation issue.
PATCH 5 : Pass through CET MSRs to Guest.
PATCH 6 : Set Guest CET state auto loading bit.
PATCH 7 : Load Guest fpu state when accessing CET XSAVES managed MSRs.
PATCH 8 : Add CET MSR user space access interface.

Changelog:

v4:
- Add Sean's patch for loading Guest fpu state before access XSAVES
managed CET MSRs.
- Melt down CET bits setting into CPUID configuration patch.
- Add VMX interface to query Host XSS.
- Check Host and Guest XSS support bits before set Guest XSS.
- Make Guest SHSTK and IBT feature enabling independent.
- Do not report CET support to Guest when Host CET feature is
Disabled.

v3:
- Modified patches to make Guest CET independent to Host enabling.
- Added patch 8 to add user space access for Guest CET MSR access.
- Modified code comments and patch description to reflect changes.

v2:
- Re-ordered patch sequence, combined one patch.
- Added more description for CET related VMCS fields.
- Added Host CET capability check while enabling Guest CET loading bit.
- Added Host CET capability check while reporting Guest CPUID(EAX=7,
EXC=0).
- Modified code in reporting Guest CPUID(EAX=D,ECX>=1), make it clearer.
- Added Host and Guest XSS mask check while setting bits for Guest XSS.


Sean Christopherson (1):
KVM:x86: load guest fpu state when accessing MSRs managed by XSAVES

Yang Weijiang (7):
KVM:VMX: Define CET VMCS fields and bits
KVM:CPUID: Add CET CPUID support for Guest
KVM:CPUID: Fix xsaves area size calculation for CPUID.(EAX=0xD,ECX=1).
KVM:VMX: Pass through host CET related MSRs to Guest.
KVM:VMX: Load Guest CET via VMCS when CET is enabled in Guest
KVM:x86: Allow Guest to set supported bits in XSS
KVM:x86: Add user-space read/write interface for CET MSRs

arch/x86/include/asm/kvm_host.h | 5 +-
arch/x86/include/asm/msr-index.h | 2 +
arch/x86/include/asm/vmx.h | 8 +++
arch/x86/kvm/cpuid.c | 53 ++++++++++++++------
arch/x86/kvm/vmx.c | 86 ++++++++++++++++++++++++++++++--
arch/x86/kvm/x86.c | 32 +++++++++++-
arch/x86/kvm/x86.h | 4 ++
7 files changed, 167 insertions(+), 23 deletions(-)

--
2.17.1

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