lkml.org 
[lkml]   [2015]   [Feb]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [Qemu-devel] [RFC PATCH v2 04/15] cpu-model/s390: Introduce S390 CPU models


    On 20.02.15 20:43, Michael Mueller wrote:
    > On Fri, 20 Feb 2015 18:50:20 +0100
    > Alexander Graf <agraf@suse.de> wrote:
    >
    >>
    >>
    >>
    >>> Am 20.02.2015 um 18:37 schrieb Michael Mueller <mimu@linux.vnet.ibm.com>:
    >>>
    >>> On Fri, 20 Feb 2015 17:57:52 +0100
    >>> Alexander Graf <agraf@suse.de> wrote:
    >>>
    >>>> Because all CPUs we have in our list only expose 128 bits?
    >>>
    >>> Here a STFLE result on a EC12 GA2, already more than 128 bits... Is that model on the list?
    >>
    >> If that model has 3 elements, yes, the array should span 3.
    >>
    >> I hope it's in the list. Every model wecare about should be, no?
    >>
    >
    > On my list? Yes!
    >
    >>>
    >>> [mimu@p57lp59 s390xfac]$ ./s390xfac -b
    >>> fac[0] = 0xfbfffffbfcfff840
    >>> fac[1] = 0xffde000000000000
    >>> fac[2] = 0x1800000000000000
    >>>>
    >>>>> I want to have this independent from a future machine of the z/Arch. The kernel stores the
    >>>>> full facility set, KVM does and there is no good reason for QEMU not to do. If other
    >>>>> accelerators decide to just implement 64 or 128 bits of facilities that's ok...
    >>>>
    >>>> So you want to support CPUs that are not part of the list?
    >>>
    >>> The architecture at least defines more than 2 or 3. Do you want me to limit it to an arbitrary
    >>> size?. Only in QEMU or also in the KVM interface?
    >>
    >> Only internally in QEMU. The kvm interface should definitely be as big as the spec allows!
    >
    > Right, now we're on the same page again. That can be taken in consideration. ... Although it's
    > just and optimization. :-)

    Yeah. You could also consider using the QEMU built-in bitmap type and
    functions and just convert from there. That would give you native
    support for bit values > 64.


    Alex


    \
     
     \ /
      Last update: 2015-02-20 21:01    [W:3.576 / U:0.640 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site