linux-kernel - [PATCH v4 0/2] x86: sgx_vepc: implement ioctl to EREMOVE all pages

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Message-Id: <20211021201155.1523989-1-pbonzini@redhat.com>
Date:   Thu, 21 Oct 2021 16:11:53 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     bp@...e.de, seanjc@...gle.com, dave.hansen@...ux.intel.com,
        jarkko@...nel.org, yang.zhong@...el.com, x86@...nel.org
Subject: [PATCH v4 0/2] x86: sgx_vepc: implement ioctl to EREMOVE all pages

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

Changes from v3:
- keep the warning if EREMOVE causes a #PF (or any other fault
  than 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(-)

-- 
2.27.0