linux-kernel - Re: [RFCv1 2/7] x86/kvm: Introduce KVM memory protection feature

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Date:   Fri, 9 Apr 2021 16:36:01 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "Kleen, Andi" <andi.kleen@...el.com>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFCv1 2/7] x86/kvm: Introduce KVM memory protection feature

On Thu, Apr 08, 2021 at 11:52:35AM +0200, Borislav Petkov wrote:
> On Fri, Apr 02, 2021 at 06:26:40PM +0300, Kirill A. Shutemov wrote:
> > Provide basic helpers, KVM_FEATURE, CPUID flag and a hypercall.
> > 
> > Host side doesn't provide the feature yet, so it is a dead code for now.
> > 
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> > ---
> >  arch/x86/include/asm/cpufeatures.h   |  1 +
> >  arch/x86/include/asm/kvm_para.h      |  5 +++++
> >  arch/x86/include/uapi/asm/kvm_para.h |  3 ++-
> >  arch/x86/kernel/kvm.c                | 18 ++++++++++++++++++
> >  include/uapi/linux/kvm_para.h        |  3 ++-
> >  5 files changed, 28 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> > index 84b887825f12..5b6f23e6edc4 100644
> > --- a/arch/x86/include/asm/cpufeatures.h
> > +++ b/arch/x86/include/asm/cpufeatures.h
> > @@ -238,6 +238,7 @@
> >  #define X86_FEATURE_VMW_VMMCALL		( 8*32+19) /* "" VMware prefers VMMCALL hypercall instruction */
> >  #define X86_FEATURE_SEV_ES		( 8*32+20) /* AMD Secure Encrypted Virtualization - Encrypted State */
> >  #define X86_FEATURE_VM_PAGE_FLUSH	( 8*32+21) /* "" VM Page Flush MSR is supported */
> > +#define X86_FEATURE_KVM_MEM_PROTECTED	( 8*32+22) /* KVM memory protection extenstion */
> 										    ^^^^^^^^^^
> What's that feature bit for?

The patchset is still in path-finding stage. I'll be more specific once we
settle on how the feature works.
 
> Also, use a spellchecker pls: "extenstion".

Ouch. Thanks.

-- 
 Kirill A. Shutemov