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([10.124.222.53]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2024 15:48:38 -0700 From: Rick Edgecombe To: seanjc@google.com, pbonzini@redhat.com, kvm@vger.kernel.org Cc: kai.huang@intel.com, isaku.yamahata@gmail.com, tony.lindgren@linux.intel.com, xiaoyao.li@intel.com, linux-kernel@vger.kernel.org, rick.p.edgecombe@intel.com Subject: [PATCH 20/25] KVM: X86: Introduce tdx_get_kvm_supported_cpuid() Date: Mon, 12 Aug 2024 15:48:15 -0700 Message-Id: <20240812224820.34826-21-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240812224820.34826-1-rick.p.edgecombe@intel.com> References: <20240812224820.34826-1-rick.p.edgecombe@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Two future TDX ioctl's will want to filter output by supported CPUID Add a helper in TDX code instead of using kvm_get_supported_cpuid_internal() directly for two reasons: 1. Logic around which CPUID leaf ranges to query would need to be duplicated. 2. Future patches will add TDX specific fixups to the CPUID data provided by kvm_get_supported_cpuid_internal(). Signed-off-by: Rick Edgecombe --- uAPI breakout v1: - New patch --- arch/x86/kvm/vmx/tdx.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index ba7b436fae86..b2ed031ac0d6 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1014,6 +1014,30 @@ static int tdx_td_vcpu_init(struct kvm_vcpu *vcpu, u64 vcpu_rcx) return ret; } +static int __maybe_unused tdx_get_kvm_supported_cpuid(struct kvm_cpuid2 **cpuid) +{ + int r; + static const u32 funcs[] = { + 0, 0x80000000, KVM_CPUID_SIGNATURE, + }; + + *cpuid = kzalloc(sizeof(struct kvm_cpuid2) + + sizeof(struct kvm_cpuid_entry2) * KVM_MAX_CPUID_ENTRIES, + GFP_KERNEL); + if (!*cpuid) + return -ENOMEM; + (*cpuid)->nent = KVM_MAX_CPUID_ENTRIES; + r = kvm_get_supported_cpuid_internal(*cpuid, funcs, ARRAY_SIZE(funcs)); + if (r) + goto err; + + return 0; +err: + kfree(*cpuid); + *cpuid = NULL; + return r; +} + static int tdx_vcpu_init(struct kvm_vcpu *vcpu, struct kvm_tdx_cmd *cmd) { struct msr_data apic_base_msr;