linux-kernel - Re: [PATCH v3 0/2] x86: sgx_vepc: implement ioctl to EREMOVE all pages

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Message-ID: <YW1vdbfzv7xlBCQF@zn.tnic>
Date:   Mon, 18 Oct 2021 14:58:29 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     seanjc@...gle.com
Cc:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, dave.hansen@...ux.intel.com, x86@...nel.org,
        yang.zhong@...el.com, jarkko@...nel.org
Subject: Re: [PATCH v3 0/2] x86: sgx_vepc: implement ioctl to EREMOVE all
 pages

On Sat, Oct 16, 2021 at 03:14:32AM -0400, Paolo Bonzini wrote:
> Add to /dev/sgx_vepc a ioctl that brings vEPC pages back to uninitialized
> state with EREMOVE.  This is useful in order to match the expectations
> of guests after reboot, and to match the behavior of real hardware.
> 
> The ioctl is a cleaner alternative to closing and reopening the
> /dev/sgx_vepc device; reopening /dev/sgx_vepc could be problematic in
> case userspace has sandboxed itself since the time it first opened the
> device, and has thus lost permissions to do so.
> 
> If possible, I would like these patches to be included in 5.15 through
> either the x86 or the KVM tree.
> 
> Thanks,
> 
> Paolo
> 
> Changes from RFC:
> - improved commit messages, added documentation
> - renamed ioctl from SGX_IOC_VEPC_REMOVE to SGX_IOC_VEPC_REMOVE_ALL
> 
> Change from v1:
> - fixed documentation and code to cover SGX_ENCLAVE_ACT errors
> - removed Tested-by since the code is quite different now
> 
> Changes from v2:
> - return EBUSY also if EREMOVE causes a general protection fault
> 
> Paolo Bonzini (2):
>   x86: sgx_vepc: extract sgx_vepc_remove_page
>   x86: sgx_vepc: implement SGX_IOC_VEPC_REMOVE_ALL ioctl
> 
>  Documentation/x86/sgx.rst       | 35 +++++++++++++++++++++
>  arch/x86/include/uapi/asm/sgx.h |  2 ++
>  arch/x86/kernel/cpu/sgx/virt.c  | 63 ++++++++++++++++++++++++++++++---
>  3 files changed, 95 insertions(+), 5 deletions(-)

Sean,

are you happy with that version now?

Thx.

-- 
Regards/Gruss,
    Boris.

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