On Sat, Feb 01, 2020 at 09:49:37AM -0800, Sean Christopherson wrote:
> Two patches to fix the Feature Control MSR bit definitions, which didn't
> get correctly rebased.
>
> Patch 03 reworks SGX handling of Feature Control to use the new feat_ctl.c
> code, which was the entire point of that series. Patch 03 is a drop-in
> replacement for 4249f9b240b7 ("x86/cpu/intel: Detect SGX supprt").
>
> *** DISCLAIMER ***
> These patches are untested against your master, as your master doesn't boot
> on my system. The fully tested version is available at
> https://github.com/sean-jc/linux.git, branch sgx/for_jarkko_v25_rebased.
> I'll dig into the boot issue next week.
Possibly it was related that I was temporarily on top of x86/tip? It
is now again on top of Linus' tree. I created v25-rc2 tag that has
these updates:
tag v25-rc2
Tagger: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
Date: Sat Feb 1 21:27:24 2020 +0200
x86/sgx: v25-rc2
* Fix a double-free issue when SGX_IOC_ENCLAVE_ADD_PAGES
fails on executing ENCLS[EADD]. The rollback path executed
radix_tree_delete() on the same address twice when this happened.
* Return -EINTR instead of -ERESTARTSYS in SGX_IOC_ENCLAVE_ADD_PAGES when
a signal is pending.
* As requested by Borislav, move the CPUID 0x12 features to their own word
in cpufeatures.
* Sean fixed a bug from sgx_reclaimer_write() where sgx_encl_put_backing()
was called with an uninitialized pointer when sgx_encl_get_backing()
fails.
* Migrated /dev/sgx/* to misc. This is future-proof as struct miscdevice
has 'groups' for setting up sysfs attributes for the device.
* Use device_initcall instead of subsys_initcall so that misc_class is
initialized before SGX is initialized.
* Return -EACCES in SGX_IOC_ENCLAVE_INIT when caller tries to select
enclave attributes that we the kernel does not allow it to set instead
of -EINVAL.
* Unless SGX public key MSRs are writable always deny the feature from
Linux. Previously this was only denied from driver. How VMs should be
supported is not really part of initial patch set, which makes this
an obvious choice.
* Rewrote the documentation. Lessened the fine-grained micro architecture
details as they can be looked up from Intel SDM in order to make the
core ideas more approachable.
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If you fix any regression, use solely this tag as the baseline for
fixes. I worry about possible merge conflicts with the master.
/Jarkko
