From: Sean Christopherson <seanjc@google.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Kai Huang <kai.huang@intel.com>,
linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org,
jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com,
haitao.huang@intel.com, pbonzini@redhat.com, tglx@linutronix.de,
mingo@redhat.com, hpa@zytor.com
Subject: Re: [RFC PATCH v2 01/26] x86/cpufeatures: Add SGX1 and SGX2 sub-features
Date: Tue, 19 Jan 2021 10:03:14 -0800 [thread overview]
Message-ID: <YAce4r4QhGzJqd4y@google.com> (raw)
In-Reply-To: <20210119161925.GN27433@zn.tnic>
On Tue, Jan 19, 2021, Borislav Petkov wrote:
> On Mon, Jan 18, 2021 at 04:26:49PM +1300, Kai Huang wrote:
> > diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c
> > index 3b1b01f2b248..7937a315f8cf 100644
> > --- a/arch/x86/kernel/cpu/feat_ctl.c
> > +++ b/arch/x86/kernel/cpu/feat_ctl.c
> > @@ -96,7 +96,6 @@ static void init_vmx_capabilities(struct cpuinfo_x86 *c)
> > static void clear_sgx_caps(void)
> > {
> > setup_clear_cpu_cap(X86_FEATURE_SGX);
> > - setup_clear_cpu_cap(X86_FEATURE_SGX_LC);
>
> Why is that line being removed here?
>
> Shouldn't this add SGX1 and SGX2 here instead as this function is
> supposed to, well, *clear* sgx caps on feat_ctl setup failures or
> "nosgx" cmdline?
Doesn't adding making the SGX sub-features depend on X86_FEATURE_SGX have the
same net effect? Or am I misreading do_clear_cpu_cap()?
Though if we use the cpuid_deps table, I'd vote to get rid of clear_sgx_caps()
and call setup_clear_cpu_cap(X86_FEATURE_SGX) directly. And probably change the
existing SGX_LC behavior and drop clear_sgx_caps() in a separate patch instead
of squeezing it into this one.
next prev parent reply other threads:[~2021-01-19 18:50 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 3:26 [RFC PATCH v2 00/26] KVM SGX virtualization support Kai Huang
2021-01-18 3:26 ` [RFC PATCH v2 01/26] x86/cpufeatures: Add SGX1 and SGX2 sub-features Kai Huang
2021-01-19 16:19 ` Borislav Petkov
2021-01-19 18:03 ` Sean Christopherson [this message]
2021-01-19 22:54 ` Kai Huang
2021-01-20 10:28 ` Borislav Petkov
2021-01-20 11:50 ` Jarkko Sakkinen
2021-01-20 23:23 ` Kai Huang
2021-01-21 1:01 ` Jarkko Sakkinen
2021-01-18 3:26 ` [RFC PATCH v2 02/26] x86/sgx: Remove a warn from sgx_free_epc_page() Kai Huang
2021-01-19 8:32 ` Jarkko Sakkinen
2021-01-20 0:42 ` Kai Huang
2021-01-18 3:26 ` [RFC PATCH v2 03/26] x86/sgx: Wipe out EREMOVE " Kai Huang
2021-01-18 3:26 ` [RFC PATCH v2 04/26] x86/sgx: Add SGX_CHILD_PRESENT hardware error code Kai Huang
2021-01-20 11:51 ` Jarkko Sakkinen
2021-01-18 3:26 ` [RFC PATCH v2 05/26] x86/sgx: Introduce virtual EPC for use by KVM guests Kai Huang
2021-01-20 11:54 ` Jarkko Sakkinen
2021-01-20 17:40 ` Sean Christopherson
2021-01-21 0:54 ` Jarkko Sakkinen
2021-01-21 0:55 ` Jarkko Sakkinen
2021-01-18 3:27 ` [RFC PATCH v2 06/26] x86/cpu/intel: Allow SGX virtualization without Launch Control support Kai Huang
2021-01-20 21:02 ` Dave Hansen
2021-01-20 22:36 ` Sean Christopherson
2021-01-20 23:27 ` Dave Hansen
2021-01-20 23:48 ` Kai Huang
2021-01-20 23:51 ` Dave Hansen
2021-01-21 1:53 ` Kai Huang
2021-01-21 14:35 ` Jarkko Sakkinen
2021-01-21 1:12 ` Jarkko Sakkinen
2021-01-20 23:50 ` Kai Huang
2021-01-21 1:11 ` Jarkko Sakkinen
2021-01-18 3:27 ` [RFC PATCH v2 07/26] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled Kai Huang
2021-01-18 3:27 ` [RFC PATCH v2 08/26] x86/sgx: Expose SGX architectural definitions to the kernel Kai Huang
2021-01-20 11:58 ` Jarkko Sakkinen
2021-01-20 23:53 ` Kai Huang
2021-01-18 3:27 ` [RFC PATCH v2 09/26] x86/sgx: Move ENCLS leaf definitions to sgx_arch.h Kai Huang
2021-01-20 11:59 ` Jarkko Sakkinen
2021-01-18 3:28 ` [RFC PATCH v2 10/26] x86/sgx: Add SGX2 ENCLS leaf definitions (EAUG, EMODPR and EMODT) Kai Huang
2021-01-20 11:59 ` Jarkko Sakkinen
2021-01-18 3:28 ` [RFC PATCH v2 11/26] x86/sgx: Add encls_faulted() helper Kai Huang
2021-01-20 12:03 ` Jarkko Sakkinen
2021-01-20 23:43 ` Kai Huang
2021-01-21 1:08 ` Jarkko Sakkinen
2021-01-21 1:12 ` Kai Huang
2021-01-21 14:38 ` Jarkko Sakkinen
2021-01-18 3:28 ` [RFC PATCH v2 12/26] x86/sgx: Add helper to update SGX_LEPUBKEYHASHn MSRs Kai Huang
2021-01-20 12:03 ` Jarkko Sakkinen
2021-01-20 18:36 ` Dave Hansen
2021-01-20 23:36 ` Kai Huang
2021-01-20 23:50 ` Dave Hansen
2021-01-21 1:06 ` Kai Huang
2021-01-21 1:15 ` Dave Hansen
2021-01-21 1:44 ` Kai Huang
2021-01-21 14:36 ` Jarkko Sakkinen
2021-01-21 1:18 ` Kai Huang
2021-01-21 1:09 ` Jarkko Sakkinen
2021-01-21 1:08 ` Jarkko Sakkinen
2021-01-18 3:28 ` [RFC PATCH v2 13/26] x86/sgx: Add helpers to expose ECREATE and EINIT to KVM Kai Huang
2021-01-20 12:04 ` Jarkko Sakkinen
2021-01-20 23:29 ` Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 14/26] x86/sgx: Move provisioning device creation out of SGX driver Kai Huang
2021-01-20 14:09 ` Jarkko Sakkinen
2021-01-20 23:24 ` Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 15/26] KVM: VMX: Convert vcpu_vmx.exit_reason to a union Kai Huang
2021-01-20 14:18 ` Jarkko Sakkinen
2021-01-20 16:39 ` Sean Christopherson
2021-01-21 0:47 ` Jarkko Sakkinen
2021-01-21 16:33 ` Sean Christopherson
2021-01-22 17:29 ` Jarkko Sakkinen
2021-01-18 3:28 ` [RFC PATCH v2 16/26] KVM: x86: Export kvm_mmu_gva_to_gpa_{read,write}() for SGX (VMX) Kai Huang
2021-01-20 14:19 ` Jarkko Sakkinen
2021-01-18 3:28 ` [RFC PATCH v2 17/26] KVM: x86: Define new #PF SGX error code bit Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 18/26] KVM: x86: Add support for reverse CPUID lookup of scattered features Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 19/26] KVM: x86: Add reverse-CPUID lookup support for scattered SGX features Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 20/26] KVM: VMX: Add basic handling of VM-Exit from SGX enclave Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 21/26] KVM: VMX: Frame in ENCLS handler for SGX virtualization Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 22/26] KVM: VMX: Add SGX ENCLS[ECREATE] handler to enforce CPUID restrictions Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 23/26] KVM: VMX: Add emulation of SGX Launch Control LE hash MSRs Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 24/26] KVM: VMX: Add ENCLS[EINIT] handler to support SGX Launch Control (LC) Kai Huang
2021-01-18 3:28 ` [RFC PATCH v2 25/26] KVM: VMX: Enable SGX virtualization for SGX1, SGX2 and LC Kai Huang
2021-01-18 3:29 ` [RFC PATCH v2 26/26] KVM: x86: Add capability to grant VM access to privileged SGX attribute Kai Huang
2021-01-19 8:23 ` [RFC PATCH v2 00/26] KVM SGX virtualization support Jarkko Sakkinen
2021-01-20 0:52 ` Kai Huang
2021-01-20 16:35 ` Sean Christopherson
2021-01-20 16:39 ` Paolo Bonzini
2021-01-21 1:28 ` Kai Huang
2021-01-20 23:43 ` Jarkko Sakkinen
2021-01-20 23:52 ` Kai Huang
2021-01-21 1:16 ` Jarkko Sakkinen
2021-01-21 1:27 ` Kai Huang
2021-01-21 14:34 ` Jarkko Sakkinen
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