On Wed, Jan 17, 2018 at 03:27:11PM +0100, Radim Krčmář wrote: > 2018-01-17 08:51+1100, Paul Mackerras: > > On Tue, Jan 16, 2018 at 03:45:11PM +0100, Paolo Bonzini wrote: > > > On 16/01/2018 01:59, Paul Mackerras wrote: > > > > This adds a new ioctl, KVM_PPC_GET_CPU_CHAR, that gives userspace > > > > information about the underlying machine's level of vulnerability > > > > to the recently announced vulnerabilities CVE-2017-5715, > > > > CVE-2017-5753 and CVE-2017-5754, and whether the machine provides > > > > instructions to assist software to work around the vulnerabilities. > > > > > > > > The ioctl returns two u64 words describing characteristics of the > > > > CPU and required software behaviour respectively, plus two mask > > > > words which indicate which bits have been filled in by the kernel, > > > > for extensibility. The bit definitions are the same as for the > > > > new H_GET_CPU_CHARACTERISTICS hypercall. > > > > > > > > There is also a new capability, KVM_CAP_PPC_GET_CPU_CHAR, which > > > > indicates whether the new ioctl is available. > > > > > > > > Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx> > > > > --- > > > > > > Thanks, looks good. Would you like this in 4.15? > > > > Yes please. Will you just apply the patch, or do you want me to put > > it in a branch for you to pull? > > I can apply it directly. Can you please do so ASAP; we have a whole raft of bugs downstream waiting on this. > Do I understand correctly that the interface is a KVM hypercall because > we need to forward this information into guests and other userspace can > do nothing with the information? -- 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
Attachment:
signature.asc
Description: PGP signature
