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Date:   Wed, 15 Jun 2022 22:26:54 -0500
From:   Tyler Hicks <tyhicks@linux.microsoft.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        torvalds@linux-foundation.org, akpm@linux-foundation.org,
        linux@roeck-us.net, shuah@kernel.org, patches@kernelci.org,
        lkft-triage@lists.linaro.org, pavel@denx.de, jonathanh@nvidia.com,
        f.fainelli@gmail.com, sudipm.mukherjee@gmail.com,
        slade@sladewatkins.com
Subject: Re: [PATCH 5.15 00/11] 5.15.48-rc1 review
Message-ID: <20220616032654.GA396338@sequoia>
References: <20220614183720.512073672@linuxfoundation.org>
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On 2022-06-14 20:40:29, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 5.15.48 release.
> There are 11 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
> 
> Responses should be made by Thu, 16 Jun 2022 18:37:02 +0000.
> Anything received after that time might be too late.
> 
> The whole patch series can be found in one patch at:
> 	https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.15.48-rc1.gz
> or in the git tree and branch at:
> 	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y
> and the diffstat can be found below.
> 
> thanks,
> 
> greg k-h

Hi Greg - I successfully tested this release candidate in x86_64 Hyper-V
Azure VMs with speculation controls both enabled and disabled.
Speculation controls are passed through to the guest and, of particular
interest for this release candidate, set the FB_CLEAR bit in the
IA32_ARCH_CAPABILITIES MSR.

The FB_CLEAR bit's presence is accurately conveyed in the kernel log
messages during boot and in the
/sys/devices/system/cpu/vulnerabilities/mmio_stale_data file.

I did a full LTP run in both scenarios (the results were the same) and
also compared the results to a previous run against the v5.15.45 release
(there were no regressions).

Tested-by: Tyler Hicks <tyhicks@linux.microsoft.com>

Tyler