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
