[Xen-devel] [PATCH v3 00/17] xen/arm: PSCI 1.1 and SMCCC-1.1 support and XSA-254 variant 2 update

[Julien Grall <julien.grall@xxxxxxx>]

Hi all,

Arm has recently published a SMC Calling Convention (SMCCC)
specification update [1] that provides an optimised calling convention
and optional, discoverable support for mitigating CVE-2017-5715 (XSA-254
variant 2). ARM Trusted Firmware (ATF) has already gained such an
implementation[2].

This series addresses a few things:

    - It provides a Xen implementation of PSCI v1.0, which is a
    prerequisite for being able to discover SMCCC v1.1.
    - It allows Xen to advertise SMCCC v1.1
    - It implements guest support for the ARM_WORKAROUND_1 function that is used
    to mitigate CVE-2017-5715 (if such mitigation is available on the
    hypervisor).
    - It adds Xen support for branch predictor hardening via
    ARM_WORKAROUND_1 if the firmware supports it.

This method is intended to fully replace the initial PSCI_GET_VERSION
approach. Although PSCI_GET_VERSION still works, it has an obvious
overhead and is called on some of the hottest paths. We expect
ARCH_WORKAROUND_1 to be much faster.

Cheers,

[1] https://developer.arm.com/support/security-update/downloads

[2] https://github.com/ARM-software/arm-trusted-firmware/pull/1240

[3] https://lists.xen.org/archives/html/xen-devel/2018-02/msg00447.html

Julien Grall (17):
  xen/arm: vpsci: Add support for PSCI 1.1
  xen/arm: vsmc: Implement SMCCC 1.1
  xen/arm: vsmc: Implement SMCCC_ARCH_WORKAROUND_1 BP hardening support
  xen/arm: Adapt smccc.h to be able to use it in assembly code
  xen/arm64: Implement a fast path for handling SMCCC_ARCH_WORKAROUND_1
  xen/arm64: Print a per-CPU message with the BP hardening method used
  xen/arm: smccc: Add macros SMCCC_VERSION, SMCCC_VERSION_{MINOR, MAJOR}
  xen/arm: psci: Detect SMCCC version
  xen/arm: smccc: Implement SMCCC v1.1 inline primitive
  xen/arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support
  xen/arm64: Kill PSCI_GET_VERSION as a variant-2 workaround
  xen/arm: vpsci: Remove parameter 'ver' from do_common_cpu
  xen/arm: psci: Consolidate PSCI version print
  xen/arm: psci: Prefix with static any functions not exported
  xen/arm: vpsci: Update the return type for MIGRATE_INFO_TYPE
  xen/arm: vpsci: Introduce and use PSCI_INVALID_ADDRESS
  xen/arm: vpsci: Rework the logic to start AArch32 vCPU in Thumb mode

 tools/libxl/libxl_arm.c          |   3 +-
 xen/arch/arm/arm64/bpi.S         |  34 +++-----
 xen/arch/arm/arm64/entry.S       |  56 ++++++++++++-
 xen/arch/arm/cpuerrata.c         |  55 +++++++++----
 xen/arch/arm/domain_build.c      |   1 +
 xen/arch/arm/psci.c              |  48 +++++++++--
 xen/arch/arm/vpsci.c             |  89 ++++++++++++++++----
 xen/arch/arm/vsmc.c              |  41 +++++++++
 xen/include/asm-arm/perfc_defn.h |   1 +
 xen/include/asm-arm/processor.h  |   2 +
 xen/include/asm-arm/psci.h       |   2 +
 xen/include/asm-arm/smccc.h      | 174 +++++++++++++++++++++++++++++++++++++--
 xen/include/asm-arm/vpsci.h      |   2 +-
 13 files changed, 429 insertions(+), 79 deletions(-)

-- 
2.11.0


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