Re: [Xen-devel] [PATCH v2] x86/vmx: Fix vmentry failure because of invalid LER on Broadwell

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Ross Lagerwall [mailto:ross.lagerwall@xxxxxxxxxx]
> Sent: Tuesday, May 30, 2017 10:05 PM
> 
> Occasionally, on certain Broadwell CPUs MSR_IA32_LASTINTTOIP has been
> observed to have the top three bits corrupted as though the MSR is using
> the LBR_FORMAT_EIP_FLAGS_TSX format. This is incorrect and causes a
> vmentry failure -- the MSR should contain an offset into the current
> code segment. This is assumed to be erratum BDF14. Workaround the issue
> by sign-extending into bits 48:63 for MSR_IA32_LASTINT{FROM,TO}IP.
> 
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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