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KVM: PPC: Book3S HV: Allow passthrough of an emulated device to an L3 guest 

Previously when a device was being emulated by an L1 guest for an L2
guest, that device couldn't then be passed through to an L3 guest. This
was because the L1 guest had no method for accessing L3 memory.

The hcall H_COPY_TOFROM_GUEST provides this access. Thus this setup for
passthrough can now be allowed.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Suraj Jitindar Singh 2018-12-14 16:29:10 +11:00 committed by Paul Mackerras
parent 6ff887b8bd
commit 95d386c2d2
2 changed files with 4 additions and 10 deletions
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9
arch/powerpc/kvm/book3s_64_mmu_radix.c
View File

@ -37,11 +37,10 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid,
int old_pid, old_lpid;
bool is_load = !!to;
/* Can't access quadrants 1 or 2 in non-HV mode */
if (kvmhv_on_pseries()) {
/* TODO h-call */
return -EPERM;
}
/* Can't access quadrants 1 or 2 in non-HV mode, call the HV to do it */
if (kvmhv_on_pseries())
return plpar_hcall_norets(H_COPY_TOFROM_GUEST, lpid, pid, eaddr,
__pa(to), __pa(from), n);
quadrant = 1;
if (!pid)

5
arch/powerpc/kvm/book3s_hv_nested.c
View File

@ -1284,11 +1284,6 @@ static long int __kvmhv_nested_page_fault(struct kvm_run *run,
}
/* passthrough of emulated MMIO case */
if (kvmhv_on_pseries()) {
pr_err("emulated MMIO passthrough?\n");
return -EINVAL;
}
return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea, writing);
}
if (memslot->flags & KVM_MEM_READONLY) {