On Mon, Feb 04, 2019 at 05:07:28PM +0100, Cédric Le Goater wrote:
> On 2/4/19 6:21 AM, David Gibson wrote:
> > On Mon, Jan 07, 2019 at 07:43:27PM +0100, Cédric Le Goater wrote:
> >> Theses are use to capure the XIVE EAS table of the KVM device, the
> >> configuration of the source targets.
> >>
> >> Signed-off-by: Cédric Le Goater <c...@kaod.org>
> >> ---
> >> arch/powerpc/include/uapi/asm/kvm.h | 11 ++++
> >> arch/powerpc/kvm/book3s_xive_native.c | 87 +++++++++++++++++++++++++++
> >> 2 files changed, 98 insertions(+)
> >>
> >> diff --git a/arch/powerpc/include/uapi/asm/kvm.h
> >> b/arch/powerpc/include/uapi/asm/kvm.h
> >> index 1a8740629acf..faf024f39858 100644
> >> --- a/arch/powerpc/include/uapi/asm/kvm.h
> >> +++ b/arch/powerpc/include/uapi/asm/kvm.h
> >> @@ -683,9 +683,20 @@ struct kvm_ppc_cpu_char {
> >> #define KVM_DEV_XIVE_SAVE_EQ_PAGES 4
> >> #define KVM_DEV_XIVE_GRP_SOURCES 2 /* 64-bit source attributes */
> >> #define KVM_DEV_XIVE_GRP_SYNC 3 /* 64-bit source
> >> attributes */
> >> +#define KVM_DEV_XIVE_GRP_EAS 4 /* 64-bit eas
> >> attributes */
> >>
> >> /* Layout of 64-bit XIVE source attribute values */
> >> #define KVM_XIVE_LEVEL_SENSITIVE (1ULL << 0)
> >> #define KVM_XIVE_LEVEL_ASSERTED (1ULL << 1)
> >>
> >> +/* Layout of 64-bit eas attribute values */
> >> +#define KVM_XIVE_EAS_PRIORITY_SHIFT 0
> >> +#define KVM_XIVE_EAS_PRIORITY_MASK 0x7
> >> +#define KVM_XIVE_EAS_SERVER_SHIFT 3
> >> +#define KVM_XIVE_EAS_SERVER_MASK 0xfffffff8ULL
> >> +#define KVM_XIVE_EAS_MASK_SHIFT 32
> >> +#define KVM_XIVE_EAS_MASK_MASK 0x100000000ULL
> >> +#define KVM_XIVE_EAS_EISN_SHIFT 33
> >> +#define KVM_XIVE_EAS_EISN_MASK 0xfffffffe00000000ULL
> >> +
> >> #endif /* __LINUX_KVM_POWERPC_H */
> >> diff --git a/arch/powerpc/kvm/book3s_xive_native.c
> >> b/arch/powerpc/kvm/book3s_xive_native.c
> >> index f2de1bcf3b35..0468b605baa7 100644
> >> --- a/arch/powerpc/kvm/book3s_xive_native.c
> >> +++ b/arch/powerpc/kvm/book3s_xive_native.c
> >> @@ -525,6 +525,88 @@ static int kvmppc_xive_native_sync(struct kvmppc_xive
> >> *xive, long irq, u64 addr)
> >> return 0;
> >> }
> >>
> >> +static int kvmppc_xive_native_set_eas(struct kvmppc_xive *xive, long irq,
> >> + u64 addr)
> >
> > I'd prefer to avoid the name "EAS" here. IIUC these aren't "raw" EAS
> > values, but rather essentially the "source config" in the terminology
> > of the PAPR hcalls. Which, yes, is basically implemented by setting
> > the EAS, but since it's the PAPR architected state that we need to
> > preserve across migration, I'd prefer to stick as close as we can to
> > the PAPR terminology.
>
> But we don't have an equivalent name in the PAPR specs for the tuple
> (prio, server). We could use the generic 'target' name may be ? even
> if this is usually referring to a CPU number.
Um.. what? That's about terminology for one of the fields in this
thing, not about the name for the thing itself.
> Or, IVE (Interrupt Vector Entry) ? which makes some sense.
> This is was the former name in HW. I think we recycle it for KVM.
That's a terrible idea, which will make a confusing situation even
more confusing.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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