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Implement hcall based RTAS for pSeries machines

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On pSeries machines, operating systems can instantiate "RTAS" (Run-Time
Abstraction Services), a runtime component of the firmware which implements
a number of low-level, infrequently used operations.  On logical partitions
under a hypervisor, many of the RTAS functions require hypervisor
privilege.  For simplicity, therefore, hypervisor systems typically
implement the in-partition RTAS as just a tiny wrapper around a hypercall
which actually implements the various RTAS functions.

This patch implements such a hypercall based RTAS for our emulated pSeries
machine.  A tiny in-partition "firmware" calls a new hypercall, which
looks up available RTAS services in a table.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
David Gibson 2011-04-01 15:15:23 +11:00 • committed by Alexander Graf
parent f43e35255c
commit 39ac845510
10 changed files with 289 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

44
hw/spapr_hcall.c
View file

@ -248,20 +248,38 @@ static target_ulong h_protect(CPUState *env, sPAPREnvironment *spapr,
return H_SUCCESS;
}
spapr_hcall_fn hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
static target_ulong h_rtas(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong rtas_r3 = args[0];
uint32_t token = ldl_phys(rtas_r3);
uint32_t nargs = ldl_phys(rtas_r3 + 4);
uint32_t nret = ldl_phys(rtas_r3 + 8);
return spapr_rtas_call(spapr, token, nargs, rtas_r3 + 12,
nret, rtas_r3 + 12 + 4*nargs);
}
spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX - KVMPPC_HCALL_BASE];
void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn)
{
spapr_hcall_fn old_fn;
spapr_hcall_fn *slot;
assert(opcode <= MAX_HCALL_OPCODE);
assert((opcode & 0x3) == 0);
if (opcode <= MAX_HCALL_OPCODE) {
assert((opcode & 0x3) == 0);
old_fn = hypercall_table[opcode / 4];
slot = &papr_hypercall_table[opcode / 4];
} else {
assert((opcode >= KVMPPC_HCALL_BASE) && (opcode <= KVMPPC_HCALL_MAX));
assert(!old_fn || (fn == old_fn));
hypercall_table[opcode / 4] = fn;
slot = &kvmppc_hypercall_table[opcode - KVMPPC_HCALL_BASE];
}
assert(!(*slot) || (fn == *slot));
*slot = fn;
}
target_ulong spapr_hypercall(CPUState *env, target_ulong opcode,
@ -274,7 +292,14 @@ target_ulong spapr_hypercall(CPUState *env, target_ulong opcode,
if ((opcode <= MAX_HCALL_OPCODE)
&& ((opcode & 0x3) == 0)) {
spapr_hcall_fn fn = hypercall_table[opcode / 4];
spapr_hcall_fn fn = papr_hypercall_table[opcode / 4];
if (fn) {
return fn(env, spapr, opcode, args);
}
} else if ((opcode >= KVMPPC_HCALL_BASE) &&
(opcode <= KVMPPC_HCALL_MAX)) {
spapr_hcall_fn fn = kvmppc_hypercall_table[opcode - KVMPPC_HCALL_BASE];
if (fn) {
return fn(env, spapr, opcode, args);
@ -291,5 +316,8 @@ static void hypercall_init(void)
spapr_register_hypercall(H_ENTER, h_enter);
spapr_register_hypercall(H_REMOVE, h_remove);
spapr_register_hypercall(H_PROTECT, h_protect);
/* qemu/KVM-PPC specific hcalls */
spapr_register_hypercall(KVMPPC_H_RTAS, h_rtas);
}
device_init(hypercall_init);