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Shutemov" To: Brijesh Singh Cc: Borislav Petkov , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Michael Roth , Vlastimil Babka , Andi Kleen , "Dr . David Alan Gilbert" , brijesh.ksingh@gmail.com, tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH v10 21/45] x86/mm: Add support to validate memory when changing C-bit Message-ID: <20220221174121.ceeplpoaz63q72kv@box> References: <20220216160457.1748381-1-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220216160457.1748381-1-brijesh.singh@amd.com> X-Rspamd-Queue-Id: D0B6580017 X-Stat-Signature: 1dczufdqms3sfmcrn9kcrf5ekbd9zucw Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=shutemov-name.20210112.gappssmtp.com header.s=20210112 header.b=EvNZ4JN1; dmarc=none; spf=none (imf02.hostedemail.com: domain of kirill@shutemov.name has no SPF policy when checking 209.85.208.170) smtp.mailfrom=kirill@shutemov.name X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1645465226-697987 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 Wed, Feb 16, 2022 at 10:04:57AM -0600, Brijesh Singh wrote: > @@ -287,6 +301,7 @@ struct x86_platform_ops { > struct x86_legacy_features legacy; > void (*set_legacy_features)(void); > struct x86_hyper_runtime hyper; > + struct x86_guest guest; > }; I used 'cc' instead of 'guest'. 'guest' looks too generic. Also, I'm not sure why not to use pointer to ops struct instead of stroing them directly in x86_platform. Yes, it is consistent with 'hyper', but I don't see it as a strong argument. > > index b4072115c8ef..a55477a6e578 100644 > --- a/arch/x86/mm/pat/set_memory.c > +++ b/arch/x86/mm/pat/set_memory.c > @@ -2012,8 +2012,15 @@ static int __set_memory_enc_pgtable(unsigned long addr, int numpages, bool enc) > */ > cpa_flush(&cpa, !this_cpu_has(X86_FEATURE_SME_COHERENT)); > > + /* Notify HV that we are about to set/clr encryption attribute. */ > + x86_platform.guest.enc_status_change_prepare(addr, numpages, enc); > + > ret = __change_page_attr_set_clr(&cpa, 1); This doesn't cover difference in flushing requirements. Can we get it too? > > + /* Notify HV that we have succesfully set/clr encryption attribute. */ > + if (!ret) > + x86_platform.guest.enc_status_change_finish(addr, numpages, enc); > + Any particular reason you moved it above cpa_flush()? I don't think it makes a difference for TDX, but still. > /* > * After changing the encryption attribute, we need to flush TLBs again > * in case any speculative TLB caching occurred (but no need to flush > @@ -2023,12 +2030,6 @@ static int __set_memory_enc_pgtable(unsigned long addr, int numpages, bool enc) > */ > cpa_flush(&cpa, 0); > > - /* > - * Notify hypervisor that a given memory range is mapped encrypted > - * or decrypted. > - */ > - notify_range_enc_status_changed(addr, numpages, enc); > - > return ret; > } > > -- > 2.25.1 > -- Kirill A. Shutemov