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Peter Anvin" , , CC: Takahiro Itazuri , Takahiro Itazuri Subject: [PATCH] KVM: pass through CPUID 0x80000005 Date: Wed, 12 Jul 2023 19:31:36 +0100 Message-ID: <20230712183136.85561-1-itazur@amazon.com> X-Mailer: git-send-email 2.38.0 MIME-Version: 1.0 X-Originating-IP: [10.106.83.21] X-ClientProxiedBy: EX19D033UWA002.ant.amazon.com (10.13.139.10) To EX19D002ANA003.ant.amazon.com (10.37.240.141) X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE,T_SPF_PERMERROR autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1771242850969328099 X-GMAIL-MSGID: 1771242850969328099 Pass CPUID 0x80000005 (L1 cache and TLB info). CPUID 0x80000006 (L2 cache and TLB and L3 cache info) has been returned since commit 43d05de2bee7 ("KVM: pass through CPUID(0x80000006)"). Enumerating both 0x80000005 and 0x80000006 with KVM_GET_SUPPORTED_CPUID would be better than reporting either, and 0x80000005 could be helpful for VMM to pass it to KVM_SET_CPUID{,2} for the same reason with 0x80000006.. Signed-off-by: Takahiro Itazuri --- Discussion was made a bit on https://lore.kernel.org/all/20230712170258.75355-1-itazur@amazon.com/. If there is any reason that leaf 0x80000005 should not be enumerated or dropping leaf 0x80000006 is preferred, please feel free to share your thoughts. --- arch/x86/kvm/cpuid.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 0c9660a07b23..54a5b256c484 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1152,6 +1152,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) cpuid_entry_override(entry, CPUID_8000_0001_EDX); cpuid_entry_override(entry, CPUID_8000_0001_ECX); break; + case 0x80000005: + /* Pass host L1 cache and TLB info. */ + break; case 0x80000006: /* Drop reserved bits, pass host L2 cache and TLB info. */ entry->edx &= ~GENMASK(17, 16);