On 02/05/2018 06:50 PM, Julien Grall wrote:
Hi all, Arm has recently published a SMC Calling Convention (SMCCC) specification update  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. 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 Xen support for the ARM_WORKAROUND_1 function that is used to mitigate CVE-2017-5715 (if such mitigation is available on the hypervisor). 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. Another series will be sent to allow the hypervisor discovering SMCCC 1.1 and use it for the mitigation. This series is based on the "xen/arm: SMCCC fixes and PSCI clean-up" one . Cheers, : https://developer.arm.com/-/media/developer/pdf/ARM%20DEN%200070A%20Firmware%20interfaces%20for%20mitigating%20CVE-2017-5715_V1.0.pdf
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: https://github.com/ARM-software/arm-trusted-firmware/pull/1240  https://lists.xenproject.org/archives/html/xen-devel/2018-02/msg00117.html Julien Grall (7): xen/arm: vpsci: Remove parameter 'ver' from do_common_cpu xen/arm: psci: Rework the PSCI definitions 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 tools/libxl/libxl_arm.c | 3 +- xen/arch/arm/arm64/entry.S | 56 +++++++++++++++++++++++++- xen/arch/arm/domain_build.c | 1 + xen/arch/arm/platforms/seattle.c | 4 +- xen/arch/arm/psci.c | 10 ++--- xen/arch/arm/vpsci.c | 85 +++++++++++++++++++++++++++++----------- 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 | 38 ++++++++++-------- xen/include/asm-arm/smccc.h | 37 ++++++++++++++--- xen/include/asm-arm/vpsci.h | 2 +- 12 files changed, 225 insertions(+), 55 deletions(-)
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