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| author | Nicholas Piggin | 2022-02-18 08:34:14 +0100 |
|---|---|---|
| committer | Cédric Le Goater | 2022-02-18 08:34:14 +0100 |
| commit | 120f738a4671977481546ff3027232f0c911127d (patch) | |
| tree | 4e17367bc9a85f66d681be31052e2bc9d270dbc7 /hw/ppc/spapr_caps.c | |
| parent | target/ppc: Introduce a vhyp framework for nested HV support (diff) | |
| download | qemu-120f738a4671977481546ff3027232f0c911127d.tar.gz qemu-120f738a4671977481546ff3027232f0c911127d.tar.xz qemu-120f738a4671977481546ff3027232f0c911127d.zip | |
spapr: implement nested-hv capability for the virtual hypervisor
This implements the Nested KVM HV hcall API for spapr under TCG.
The L2 is switched in when the H_ENTER_NESTED hcall is made, and the
L1 is switched back in returned from the hcall when a HV exception
is sent to the vhyp. Register state is copied in and out according to
the nested KVM HV hcall API specification.
The hdecr timer is started when the L2 is switched in, and it provides
the HDEC / 0x980 return to L1.
The MMU re-uses the bare metal radix 2-level page table walker by
using the get_pate method to point the MMU to the nested partition
table entry. MMU faults due to partition scope errors raise HV
exceptions and accordingly are routed back to the L1.
The MMU does not tag translations for the L1 (direct) vs L2 (nested)
guests, so the TLB is flushed on any L1<->L2 transition (hcall entry
and exit).
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
[ clg: checkpatch fixes ]
Message-Id: <20220216102545.1808018-10-npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Diffstat (limited to 'hw/ppc/spapr_caps.c')
| -rw-r--r-- | hw/ppc/spapr_caps.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c index ed7c077a0d..6167431271 100644 --- a/hw/ppc/spapr_caps.c +++ b/hw/ppc/spapr_caps.c @@ -444,19 +444,23 @@ static void cap_nested_kvm_hv_apply(SpaprMachineState *spapr, { ERRP_GUARD(); PowerPCCPU *cpu = POWERPC_CPU(first_cpu); + CPUPPCState *env = &cpu->env; if (!val) { /* capability disabled by default */ return; } - if (tcg_enabled()) { - error_setg(errp, "No Nested KVM-HV support in TCG"); + if (!(env->insns_flags2 & PPC2_ISA300)) { + error_setg(errp, "Nested-HV only supported on POWER9 and later"); error_append_hint(errp, "Try appending -machine cap-nested-hv=off\n"); - } else if (kvm_enabled()) { + return; + } + + if (kvm_enabled()) { if (!ppc_check_compat(cpu, CPU_POWERPC_LOGICAL_3_00, 0, spapr->max_compat_pvr)) { - error_setg(errp, "Nested KVM-HV only supported on POWER9"); + error_setg(errp, "Nested-HV only supported on POWER9 and later"); error_append_hint(errp, "Try appending -machine max-cpu-compat=power9\n"); return; @@ -464,7 +468,7 @@ static void cap_nested_kvm_hv_apply(SpaprMachineState *spapr, if (!kvmppc_has_cap_nested_kvm_hv()) { error_setg(errp, - "KVM implementation does not support Nested KVM-HV"); + "KVM implementation does not support Nested-HV"); error_append_hint(errp, "Try appending -machine cap-nested-hv=off\n"); } else if (kvmppc_set_cap_nested_kvm_hv(val) < 0) { |