From: Kai Huang <kai.huang@intel.com>
To: Jarkko Sakkinen <jarkko@kernel.org>, Borislav Petkov <bp@alien8.de>
Cc: kvm@vger.kernel.org, x86@kernel.org, linux-sgx@vger.kernel.org,
linux-kernel@vger.kernel.org, seanjc@google.com, luto@kernel.org,
dave.hansen@intel.com, rick.p.edgecombe@intel.com,
haitao.huang@intel.com, pbonzini@redhat.com, tglx@linutronix.de,
mingo@redhat.com, hpa@zytor.com, jethro@fortanix.com,
b.thiel@posteo.de, jmattson@google.com, joro@8bytes.org,
vkuznets@redhat.com, wanpengli@tencent.com, corbet@lwn.net
Subject: Re: [PATCH v2 00/25] KVM SGX virtualization support
Date: Thu, 11 Mar 2021 09:44:07 +1300 [thread overview]
Message-ID: <519e3851e2857f653af29d64a79044cff233401b.camel@intel.com> (raw)
In-Reply-To: <YEkJXu262YDa8ZaK@kernel.org>
On Wed, 2021-03-10 at 20:01 +0200, Jarkko Sakkinen wrote:
> On Tue, Mar 09, 2021 at 10:30:37AM +0100, Borislav Petkov wrote:
> > On Tue, Mar 09, 2021 at 02:38:49PM +1300, Kai Huang wrote:
> > > This series adds KVM SGX virtualization support. The first 14 patches starting
> > > with x86/sgx or x86/cpu.. are necessary changes to x86 and SGX core/driver to
> > > support KVM SGX virtualization, while the rest are patches to KVM subsystem.
> >
> > Ok, I guess I'll queue 1-14 once Sean doesn't find anything
> > objectionable then give Paolo an immutable commit to base the KVM stuff
> > ontop.
> >
> > Unless folks have better suggestions, ofc.
>
> I'm otherwise cool with that, except patch #2.
>
> It's based on this series:
>
> https://lore.kernel.org/linux-sgx/20210113233541.17669-1-jarkko@kernel.org/
>
> It's not reasonable to create driver specific wrapper for
> sgx_free_epc_page() because there is exactly *2* call sites of the function
> in the driver. The driver contains 10 call sites (11 after my NUMA patches
> have been applied) of sgx_free_epc_page() in total.
>
> Instead, it is better to add explicit EREMOVE to those call sites.
>
> The wrapper only trashes the codebase. I'm not happy with it, given all the
> trouble to make it clean and sound.
However, your change has side effort: it always put page back into free pool, even
EREMOVE fails. To make your change w/o having any functional change, it has to be:
if(!sgx_reset_epc_page())
sgx_free_epc_page();
And for this, Dave raised one concern we should add a WARN() to let user know EPC
page is leaked, and reboot is requied to get them back.
However with sgx_reset_epc_page(), there's no place to add such WARN(), and
implementing original sgx_free_epc_page() as sgx_encl_free_epc_page() looks very
reasonable to me:
https://www.spinics.net/lists/linux-sgx/msg04631.html
Hi Dave,
What is your comment here?
>
> > Thx.
> >
> > --
> > Regards/Gruss,
> > Boris.
> >
> > https://people.kernel.org/tglx/notes-about-netiquette
>
>
> /Jarkko
prev parent reply other threads:[~2021-03-10 20:45 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-09 1:38 [PATCH v2 00/25] KVM SGX virtualization support Kai Huang
2021-03-09 1:38 ` [PATCH v2 01/25] x86/cpufeatures: Make SGX_LC feature bit depend on SGX bit Kai Huang
2021-03-12 21:05 ` Sean Christopherson
2021-03-09 1:39 ` [PATCH v2 02/25] x86/cpufeatures: Add SGX1 and SGX2 sub-features Kai Huang
2021-03-12 21:10 ` Sean Christopherson
2021-03-09 1:39 ` [PATCH v2 03/25] x86/sgx: Wipe out EREMOVE from sgx_free_epc_page() Kai Huang
2021-03-10 9:35 ` Kai Huang
2021-03-11 2:01 ` [PATCH v3 " Kai Huang
2021-03-12 21:21 ` Sean Christopherson
2021-03-13 10:45 ` Jarkko Sakkinen
2021-03-15 7:12 ` Kai Huang
2021-03-15 13:18 ` Jarkko Sakkinen
2021-03-15 13:19 ` Jarkko Sakkinen
2021-03-15 20:29 ` Kai Huang
2021-03-15 22:59 ` Jarkko Sakkinen
2021-03-15 23:50 ` Kai Huang
2021-03-15 23:11 ` Jarkko Sakkinen
2021-03-09 1:39 ` [PATCH v2 04/25] x86/sgx: Add SGX_CHILD_PRESENT hardware error code Kai Huang
2021-03-09 1:39 ` [PATCH v2 05/25] x86/sgx: Introduce virtual EPC for use by KVM guests Kai Huang
2021-03-09 1:39 ` [PATCH v2 06/25] x86/cpu/intel: Allow SGX virtualization without Launch Control support Kai Huang
2021-03-12 21:33 ` Sean Christopherson
2021-03-09 1:39 ` [PATCH v2 07/25] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled Kai Huang
2021-03-12 21:44 ` Sean Christopherson
2021-03-13 19:05 ` Jarkko Sakkinen
2021-03-13 19:07 ` Jarkko Sakkinen
2021-03-14 15:25 ` Jarkko Sakkinen
2021-03-14 15:27 ` Jarkko Sakkinen
2021-03-15 3:13 ` Kai Huang
2021-03-15 13:04 ` Jarkko Sakkinen
2021-03-15 13:51 ` Jarkko Sakkinen
2021-03-15 20:48 ` Kai Huang
2021-03-15 23:05 ` Jarkko Sakkinen
2021-03-15 23:08 ` Jarkko Sakkinen
2021-03-15 23:49 ` Kai Huang
2021-03-16 12:44 ` Jarkko Sakkinen
2021-03-16 1:13 ` Sean Christopherson
2021-03-16 12:46 ` Jarkko Sakkinen
2021-03-18 0:04 ` Kai Huang
2021-03-09 1:39 ` [PATCH v2 08/25] x86/sgx: Expose SGX architectural definitions to the kernel Kai Huang
2021-03-12 21:58 ` Sean Christopherson
2021-03-15 3:36 ` Kai Huang
2021-03-09 1:39 ` [PATCH v2 09/25] x86/sgx: Move ENCLS leaf definitions to sgx.h Kai Huang
2021-03-09 1:39 ` [PATCH v2 10/25] x86/sgx: Add SGX2 ENCLS leaf definitions (EAUG, EMODPR and EMODT) Kai Huang
2021-03-09 1:39 ` [PATCH v2 11/25] x86/sgx: Add encls_faulted() helper Kai Huang
2021-03-09 1:39 ` [PATCH v2 12/25] x86/sgx: Add helper to update SGX_LEPUBKEYHASHn MSRs Kai Huang
2021-03-09 1:39 ` [PATCH v2 13/25] x86/sgx: Add helpers to expose ECREATE and EINIT to KVM Kai Huang
2021-03-15 4:08 ` Kai Huang
2021-03-09 1:39 ` [PATCH v2 14/25] x86/sgx: Move provisioning device creation out of SGX driver Kai Huang
2021-03-09 1:40 ` [PATCH v2 15/25] KVM: x86: Export kvm_mmu_gva_to_gpa_{read,write}() for SGX (VMX) Kai Huang
2021-03-09 1:40 ` [PATCH v2 16/25] KVM: x86: Define new #PF SGX error code bit Kai Huang
2021-03-09 1:40 ` [PATCH v2 17/25] KVM: x86: Add support for reverse CPUID lookup of scattered features Kai Huang
2021-03-09 1:40 ` [PATCH v2 18/25] KVM: x86: Add reverse-CPUID lookup support for scattered SGX features Kai Huang
2021-03-09 1:40 ` [PATCH v2 19/25] KVM: VMX: Add basic handling of VM-Exit from SGX enclave Kai Huang
2021-03-09 1:40 ` [PATCH v2 20/25] KVM: VMX: Frame in ENCLS handler for SGX virtualization Kai Huang
2021-03-09 1:40 ` [PATCH v2 21/25] KVM: VMX: Add SGX ENCLS[ECREATE] handler to enforce CPUID restrictions Kai Huang
2021-03-09 1:40 ` [PATCH v2 22/25] KVM: VMX: Add emulation of SGX Launch Control LE hash MSRs Kai Huang
2021-03-09 1:40 ` [PATCH v2 23/25] KVM: VMX: Add ENCLS[EINIT] handler to support SGX Launch Control (LC) Kai Huang
2021-03-09 1:40 ` [PATCH v2 24/25] KVM: VMX: Enable SGX virtualization for SGX1, SGX2 and LC Kai Huang
2021-03-09 1:41 ` [PATCH v2 25/25] KVM: x86: Add capability to grant VM access to privileged SGX attribute Kai Huang
2021-03-09 9:30 ` [PATCH v2 00/25] KVM SGX virtualization support Borislav Petkov
2021-03-09 18:08 ` Kai Huang
2021-03-09 18:49 ` Paolo Bonzini
2021-03-12 22:04 ` Sean Christopherson
2021-03-13 4:30 ` Kai Huang
2021-03-10 9:27 ` Kai Huang
2021-03-10 13:29 ` Borislav Petkov
2021-03-11 2:05 ` Kai Huang
2021-03-10 18:01 ` Jarkko Sakkinen
2021-03-10 20:44 ` Kai Huang [this message]
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