On 30/05/17 15:05, Ross Lagerwall wrote:
> 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.lagerw...@citrix.com>Reviewed-by: Andrew Cooper <andrew.coop...@citrix.com>, with one minor issue which can be fixed up on commit. > @@ -2791,7 +2793,11 @@ enum > > #define LBR_FROM_SIGNEXT_2MSB ((1ULL << 59) | (1ULL << 60)) > > +#define FIXUP_LBR_TSX (1 << 0) > +#define FIXUP_BDW_ERRATUM_BDF14 (1 << 1) 1u << ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
