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authorPaul Mackerras <paulus@ozlabs.org>2018-10-08 08:31:06 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-10-09 08:04:27 +0300
commit4bad77799fede9d95abaf499fff385608ee14877 (patch)
treedd193b1dd231247cc5a674a237241fc1468c2bf1 /arch/powerpc/kvm/book3s_xics.c
parentf3c18e9342a443528137a303f3c391d42d3bb394 (diff)
downloadlinux-4bad77799fede9d95abaf499fff385608ee14877.tar.xz
KVM: PPC: Book3S HV: Handle hypercalls correctly when nested
When we are running as a nested hypervisor, we use a hypercall to enter the guest rather than code in book3s_hv_rmhandlers.S. This means that the hypercall handlers listed in hcall_real_table never get called. There are some hypercalls that are handled there and not in kvmppc_pseries_do_hcall(), which therefore won't get processed for a nested guest. To fix this, we add cases to kvmppc_pseries_do_hcall() to handle those hypercalls, with the following exceptions: - The HPT hypercalls (H_ENTER, H_REMOVE, etc.) are not handled because we only support radix mode for nested guests. - H_CEDE has to be handled specially because the cede logic in kvmhv_run_single_vcpu assumes that it has been processed by the time that kvmhv_p9_guest_entry() returns. Therefore we put a special case for H_CEDE in kvmhv_p9_guest_entry(). For the XICS hypercalls, if real-mode processing is enabled, then the virtual-mode handlers assume that they are being called only to finish up the operation. Therefore we turn off the real-mode flag in the XICS code when running as a nested hypervisor. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kvm/book3s_xics.c')
-rw-r--r--arch/powerpc/kvm/book3s_xics.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c
index d9ba1b06d0f5..b0b2bfc2ff51 100644
--- a/arch/powerpc/kvm/book3s_xics.c
+++ b/arch/powerpc/kvm/book3s_xics.c
@@ -1390,7 +1390,8 @@ static int kvmppc_xics_create(struct kvm_device *dev, u32 type)
}
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
- if (cpu_has_feature(CPU_FTR_ARCH_206)) {
+ if (cpu_has_feature(CPU_FTR_ARCH_206) &&
+ cpu_has_feature(CPU_FTR_HVMODE)) {
/* Enable real mode support */
xics->real_mode = ENABLE_REALMODE;
xics->real_mode_dbg = DEBUG_REALMODE;