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target/ppc: Add Directed Privileged Door-bell Exception State (DPDES) SPR

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DPDES stores a status of a doorbell message and if it is lost in
migration, the destination CPU won't receive it. This does not hit us
much as IPIs complete too quick to catch a pending one and even if
we missed one, broadcasts happen often enough to wake that CPU.

This defines DPDES and registers with KVM for migration.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20190816061733.53572-1-aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Alexey Kardashevskiy 2019-08-16 16:17:33 +10:00 committed by David Gibson
parent f55750e4e4
commit cfc61ba62f
2 changed files with 15 additions and 0 deletions
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1
target/ppc/cpu.h
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@ -1466,6 +1466,7 @@ typedef PowerPCCPU ArchCPU;
#define SPR_MPC_ICTRL (0x09E)
#define SPR_MPC_BAR (0x09F)
#define SPR_PSPB (0x09F)
#define SPR_DPDES (0x0B0)
#define SPR_DAWR (0x0B4)
#define SPR_RPR (0x0BA)
#define SPR_CIABR (0x0BB)

14
target/ppc/translate_init.inc.c
View file

@ -8198,6 +8198,18 @@ static void gen_spr_power8_pspb(CPUPPCState *env)
KVM_REG_PPC_PSPB, 0);
}
static void gen_spr_power8_dpdes(CPUPPCState *env)
{
#if !defined(CONFIG_USER_ONLY)
/* Directed Privileged Door-bell Exception State, used for IPI */
spr_register_kvm_hv(env, SPR_DPDES, "DPDES",
SPR_NOACCESS, SPR_NOACCESS,
&spr_read_generic, SPR_NOACCESS,
&spr_read_generic, &spr_write_generic,
KVM_REG_PPC_DPDES, 0x00000000);
#endif
}
static void gen_spr_power8_ic(CPUPPCState *env)
{
#if !defined(CONFIG_USER_ONLY)
@ -8629,6 +8641,7 @@ static void init_proc_POWER8(CPUPPCState *env)
gen_spr_power8_pmu_user(env);
gen_spr_power8_tm(env);
gen_spr_power8_pspb(env);
gen_spr_power8_dpdes(env);
gen_spr_vtb(env);
gen_spr_power8_ic(env);
gen_spr_power8_book4(env);
@ -8817,6 +8830,7 @@ static void init_proc_POWER9(CPUPPCState *env)
gen_spr_power8_pmu_user(env);
gen_spr_power8_tm(env);
gen_spr_power8_pspb(env);
gen_spr_power8_dpdes(env);
gen_spr_vtb(env);
gen_spr_power8_ic(env);
gen_spr_power8_book4(env);