[resending because I mistakenly sent an html mime mail before, which got rejected by kvm@vger]
On 20.12.2011, at 12:41, Christian Borntraeger wrote:
> From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
>
> For guest relocation and virsh dump qemu needs an interface to
> get/set additional registers from kvm. We also need the prefix
> register for all guest memory accesses to the prefix pages.
>
> The prefix register could also be set via the KVM_S390_SIGP_SET_PREFIX
> interrupt ioctl, but I also added the synchronous operation to have
>
> o symmetry: we want to have the same struct for get/set routine
> o the interrupt is only delivered before entering the SIE, we also
> want to cover the sequence set prefix/store status at prefix
>
> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ---
> Documentation/virtual/kvm/api.txt | 31 +++++++++++++++++++++++++++++++
> arch/s390/include/asm/kvm.h | 9 +++++++++
> arch/s390/kvm/kvm-s390.c | 30 ++++++++++++++++++++++++++++++
> include/linux/kvm.h | 4 ++++
> 4 files changed, 74 insertions(+)
>
> Index: b/Documentation/virtual/kvm/api.txt
> ===================================================================
> --- a/Documentation/virtual/kvm/api.txt
> +++ b/Documentation/virtual/kvm/api.txt
> @@ -1450,6 +1450,37 @@ is supported; 2 if the processor require
> an RMA, or 1 if the processor can use an RMA but doesn't require it,
> because it supports the Virtual RMA (VRMA) facility.
>
> +4.64 KVM_S390_GET_SREGS2
> +
> +Capability: KVM_CAP_S390_SREGS2
> +Architectures: s390x
> +Type: vcpu ioctl
> +Parameters: struct kvm_sregs2 (out)
> +Returns: 0 on success, -1 on error
> +
> +Reads special registers from the vcpu which are not covered by sregs.
> +
> +/* s390x */
> +struct kvm_sregs2 {
> + __u64 ckc; /* clock comparator */
> + __u64 cputm; /* cpu timer */
> + __u64 gbea; /* guest breaking event address */
> + __u32 todpr; /* tod programmable field */
> + __u32 prefix; /* prefix register */
> +};
Would it make sense to instead use the GET_ONE_REG and SET_ONE_REG interfaces?
http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/80854
> +
> +4.65 KVM_S390_SET_SREGS2
I would very much appreciate if you could use 4.66 here. That makes merging the sections for GET_ONE_REG and SET_ONE_REG easier :).
Alex
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