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target/ppc: Introduce a vhyp framework for nested HV support

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Introduce virtual hypervisor methods that can support a "Nested KVM HV"
implementation using the bare metal 2-level radix MMU, and using HV
exceptions to return from H_ENTER_NESTED (rather than cause interrupts).

HV exceptions can now be raised in the TCG spapr machine when running a
nested KVM HV guest. The main ones are the lev==1 syscall, the hdecr,
hdsi and hisi, hv fu, and hv emu, and h_virt external interrupts.

HV exceptions are intercepted in the exception handler code and instead
of causing interrupts in the guest and switching the machine to HV mode,
they go to the vhyp where it may exit the H_ENTER_NESTED hcall with the
interrupt vector numer as return value as required by the hcall API.

Address translation is provided by the 2-level page table walker that is
implemented for the bare metal radix MMU. The partition scope page table
is pointed to the L1's partition scope by the get_pate vhc method.

Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220216102545.1808018-9-npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Nicholas Piggin 2022-02-18 08:34:14 +01:00 • committed by Cédric Le Goater
parent 3680e99461
commit 7cebc5db2e
5 changed files with 81 additions and 13 deletions
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6
hw/ppc/pegasos2.c
View file

@ -449,6 +449,11 @@ static target_ulong pegasos2_rtas(PowerPCCPU *cpu, Pegasos2MachineState *pm,
}
}
static bool pegasos2_cpu_in_nested(PowerPCCPU *cpu)
{
return false;
}
static void pegasos2_hypercall(PPCVirtualHypervisor *vhyp, PowerPCCPU *cpu)
{
Pegasos2MachineState *pm = PEGASOS2_MACHINE(vhyp);
@ -504,6 +509,7 @@ static void pegasos2_machine_class_init(ObjectClass *oc, void *data)
mc->default_ram_id = "pegasos2.ram";
mc->default_ram_size = 512 * MiB;
vhc->cpu_in_nested = pegasos2_cpu_in_nested;
vhc->hypercall = pegasos2_hypercall;
vhc->cpu_exec_enter = vhyp_nop;
vhc->cpu_exec_exit = vhyp_nop;

6
hw/ppc/spapr.c
View file

@ -4472,6 +4472,11 @@ PowerPCCPU *spapr_find_cpu(int vcpu_id)
return NULL;
}
static bool spapr_cpu_in_nested(PowerPCCPU *cpu)
{
return false;
}
static void spapr_cpu_exec_enter(PPCVirtualHypervisor *vhyp, PowerPCCPU *cpu)
{
SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
@ -4580,6 +4585,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
fwc->get_dev_path = spapr_get_fw_dev_path;
nc->nmi_monitor_handler = spapr_nmi;
smc->phb_placement = spapr_phb_placement;
vhc->cpu_in_nested = spapr_cpu_in_nested;
vhc->hypercall = emulate_spapr_hypercall;
vhc->hpt_mask = spapr_hpt_mask;
vhc->map_hptes = spapr_map_hptes;