Re: [RFC PATCH V2 10/18] drivers: hv: Decrypt percpu hvcall input arg page in sev-snp enlightened guest

[Tianyu Lan <ltykernel@xxxxxxxxx>]

On 12/15/2022 2:16 AM, Michael Kelley (LINUX) wrote:
> > @@ -134,6 +136,16 @@ int hv_common_cpu_init(unsigned int cpu)
> >   	if (!(*inputarg))
> >   		return -ENOMEM;
> >
> > +	if (hv_isolation_type_en_snp()) {
> > +		ret = set_memory_decrypted((unsigned long)*inputarg, 1);
> > +		if (ret) {
> > +			kfree(*inputarg);
> After the kfree(), set *inputarg back to NULL.  There's other code that
> tests the value of *inputarg to know if the per-CPU hypercall page has
> been successfully allocated.

Good point! Will add in the next version.