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    Subject[PATCH 7/7] x86/kvm: Expose LASS feature to VM guest
    Date
    From: Paul Lai <paul.c.lai@intel.com>

    Expose LASS feature which is defined in the CPUID.7.1.EAX
    bit and enabled via the CR4 bit for VM guest.

    Signed-off-by: Paul Lai <paul.c.lai@intel.com>
    Signed-off-by: Yian Chen <yian.chen@intel.com>
    Reviewed-by: Tony Luck <tony.luck@intel.com>
    ---
    arch/x86/include/asm/kvm_host.h | 3 ++-
    arch/x86/kvm/cpuid.c | 2 +-
    2 files changed, 3 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    index f35f1ff4427b..bd39f45e9b5a 100644
    --- a/arch/x86/include/asm/kvm_host.h
    +++ b/arch/x86/include/asm/kvm_host.h
    @@ -125,7 +125,8 @@
    | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR | X86_CR4_PCIDE \
    | X86_CR4_OSXSAVE | X86_CR4_SMEP | X86_CR4_FSGSBASE \
    | X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_VMXE \
    - | X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP))
    + | X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP \
    + | X86_CR4_LASS))

    #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)

    diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
    index b14653b61470..e0f53f85f5ae 100644
    --- a/arch/x86/kvm/cpuid.c
    +++ b/arch/x86/kvm/cpuid.c
    @@ -664,7 +664,7 @@ void kvm_set_cpu_caps(void)

    kvm_cpu_cap_mask(CPUID_7_1_EAX,
    F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) |
    - F(AVX_IFMA)
    + F(AVX_IFMA) | F(LASS)
    );

    kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX,
    --
    2.34.1
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