Re: [Xen-devel] [PATCH 0/7] xen/arm: PSCI 1.1 and SMCCC-1.1 support and XSA-254 variant 2 update

[Julien Grall <julien.grall@xxxxxxx>]

On 08/02/18 16:26, Manish Jaggi wrote:
> On 02/05/2018 06:50 PM, Julien Grall wrote:
> > 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 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 [3].
> > Cheers,
> >
> > [1]: 
> > https://developer.arm.com/-/media/developer/pdf/ARM%20DEN%200070A%20Firmware%20interfaces%20for%20mitigating%20CVE-2017-5715_V1.0.pdf 
> This link is not working.
Because the link has been relocated since then. You can find it at:

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

Cheers,

--
Julien Grall

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