[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH RFC 1/6] public/xen.h: add flags field to vcpu_time_info
On Mon, Dec 28, 2015 at 04:59:40PM +0000, Joao Martins wrote: > This field has two possible flags (as of latest pvclock ABI > shared with KVM). <sigh> Wish they had CC-ed xen-devel instead of just doing their change > > flags: bits in this field indicate extended capabilities > coordinated between the guest and the hypervisor. Specifically > on KVM, availability of specific flags has to be checked in > 0x40000001 cpuid leaf. On Xen, we don't have that but we can > still check some of the flags after registering the time info > page since a force_update_vcpu_system_time is performed. > > Current flags are: > > flag bit | cpuid bit | meaning > ------------------------------------------------------------- > | | time measures taken across > 0 | 24 | multiple cpus are guaranteed to > | | be monotonic > ------------------------------------------------------------- > | | guest vcpu has been paused by > 1 | N/A | the host > | | > ------------------------------------------------------------- > > Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > --- > xen/include/public/xen.h | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h > index ff5547e..1223686 100644 > --- a/xen/include/public/xen.h > +++ b/xen/include/public/xen.h > @@ -601,10 +601,14 @@ struct vcpu_time_info { > */ > uint32_t tsc_to_system_mul; > int8_t tsc_shift; > - int8_t pad1[3]; > + int8_t flags; > + int8_t pad1[2]; > }; /* 32 bytes */ > typedef struct vcpu_time_info vcpu_time_info_t; > > +#define PVCLOCK_TSC_STABLE_BIT (1 << 0) > +#define PVCLOCK_GUEST_STOPPED (1 << 1) > + > struct vcpu_info { > /* > * 'evtchn_upcall_pending' is written non-zero by Xen to indicate > -- > 2.1.4 > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxx > http://lists.xen.org/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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