Re: [PATCH 5.10 00/11] 5.10.123-rc1 review

[Tyler Hicks <tyhicks@linux.microsoft.com>]

On 2022-06-14 20:40:22, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 5.10.123 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-5.10.123-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-5.10.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 v5.10.118
release (there were no regressions).

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

Tyler