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Shutemov" To: Borislav Petkov Cc: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Sean Christopherson , Jim Mattson , David Rientjes , "Edgecombe, Rick P" , "Kleen, Andi" , "Yamahata, Isaku" , x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: Re: [RFCv1 2/7] x86/kvm: Introduce KVM memory protection feature Message-ID: <20210409133601.2qepfc77stujulhf@box> References: <20210402152645.26680-1-kirill.shutemov@linux.intel.com> <20210402152645.26680-3-kirill.shutemov@linux.intel.com> <20210408095235.GH10192@zn.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210408095235.GH10192@zn.tnic> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 11571E000118 X-Stat-Signature: 95h41q58wwta741kuqpyscyqxjs3xrfi Received-SPF: none (shutemov.name>: No applicable sender policy available) receiver=imf30; identity=mailfrom; envelope-from=""; helo=mail-lf1-f47.google.com; client-ip=209.85.167.47 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617975356-238467 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 > > --- > > 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