qemu/target/ppc/mmu-hash64.h
David Gibson 0b0b831016 pseries: Implement HPT resizing
This patch implements hypercalls allowing a PAPR guest to resize its own
hash page table.  This will eventually allow for more flexible memory
hotplug.

The implementation is partially asynchronous, handled in a special thread
running the hpt_prepare_thread() function.  The state of a pending resize
is stored in SPAPR_MACHINE->pending_hpt.

The H_RESIZE_HPT_PREPARE hypercall will kick off creation of a new HPT, or,
if one is already in progress, monitor it for completion.  If there is an
existing HPT resize in progress that doesn't match the size specified in
the call, it will cancel it, replacing it with a new one matching the
given size.

The H_RESIZE_HPT_COMMIT completes transition to a resized HPT, and can only
be called successfully once H_RESIZE_HPT_PREPARE has successfully
completed initialization of a new HPT.  The guest must ensure that there
are no concurrent accesses to the existing HPT while this is called (this
effectively means stop_machine() for Linux guests).

For now H_RESIZE_HPT_COMMIT goes through the whole old HPT, rehashing each
HPTE into the new HPT.  This can have quite high latency, but it seems to
be of the order of typical migration downtime latencies for HPTs of size
up to ~2GiB (which would be used in a 256GiB guest).

In future we probably want to move more of the rehashing to the "prepare"
phase, by having H_ENTER and other hcalls update both current and
pending HPTs.  That's a project for another day, but should be possible
without any changes to the guest interface.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2017-07-17 15:07:05 +10:00

140 lines
5.3 KiB
C

#ifndef MMU_HASH64_H
#define MMU_HASH64_H
#ifndef CONFIG_USER_ONLY
#ifdef TARGET_PPC64
void dump_slb(FILE *f, fprintf_function cpu_fprintf, PowerPCCPU *cpu);
int ppc_store_slb(PowerPCCPU *cpu, target_ulong slot,
target_ulong esid, target_ulong vsid);
hwaddr ppc_hash64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong addr);
int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr address, int rw,
int mmu_idx);
void ppc_hash64_store_hpte(PowerPCCPU *cpu, hwaddr ptex,
uint64_t pte0, uint64_t pte1);
void ppc_hash64_tlb_flush_hpte(PowerPCCPU *cpu,
target_ulong pte_index,
target_ulong pte0, target_ulong pte1);
unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
uint64_t pte0, uint64_t pte1);
void ppc_hash64_update_vrma(CPUPPCState *env);
void ppc_hash64_update_rmls(CPUPPCState *env);
#endif
/*
* SLB definitions
*/
/* Bits in the SLB ESID word */
#define SLB_ESID_ESID 0xFFFFFFFFF0000000ULL
#define SLB_ESID_V 0x0000000008000000ULL /* valid */
/* Bits in the SLB VSID word */
#define SLB_VSID_SHIFT 12
#define SLB_VSID_SHIFT_1T 24
#define SLB_VSID_SSIZE_SHIFT 62
#define SLB_VSID_B 0xc000000000000000ULL
#define SLB_VSID_B_256M 0x0000000000000000ULL
#define SLB_VSID_B_1T 0x4000000000000000ULL
#define SLB_VSID_VSID 0x3FFFFFFFFFFFF000ULL
#define SLB_VSID_VRMA (0x0001FFFFFF000000ULL | SLB_VSID_B_1T)
#define SLB_VSID_PTEM (SLB_VSID_B | SLB_VSID_VSID)
#define SLB_VSID_KS 0x0000000000000800ULL
#define SLB_VSID_KP 0x0000000000000400ULL
#define SLB_VSID_N 0x0000000000000200ULL /* no-execute */
#define SLB_VSID_L 0x0000000000000100ULL
#define SLB_VSID_C 0x0000000000000080ULL /* class */
#define SLB_VSID_LP 0x0000000000000030ULL
#define SLB_VSID_ATTR 0x0000000000000FFFULL
#define SLB_VSID_LLP_MASK (SLB_VSID_L | SLB_VSID_LP)
#define SLB_VSID_4K 0x0000000000000000ULL
#define SLB_VSID_64K 0x0000000000000110ULL
#define SLB_VSID_16M 0x0000000000000100ULL
#define SLB_VSID_16G 0x0000000000000120ULL
/*
* Hash page table definitions
*/
#define SDR_64_HTABORG 0x0FFFFFFFFFFC0000ULL
#define SDR_64_HTABSIZE 0x000000000000001FULL
#define HPTES_PER_GROUP 8
#define HASH_PTE_SIZE_64 16
#define HASH_PTEG_SIZE_64 (HASH_PTE_SIZE_64 * HPTES_PER_GROUP)
#define HPTE64_V_SSIZE SLB_VSID_B
#define HPTE64_V_SSIZE_256M SLB_VSID_B_256M
#define HPTE64_V_SSIZE_1T SLB_VSID_B_1T
#define HPTE64_V_SSIZE_SHIFT 62
#define HPTE64_V_AVPN_SHIFT 7
#define HPTE64_V_AVPN 0x3fffffffffffff80ULL
#define HPTE64_V_AVPN_VAL(x) (((x) & HPTE64_V_AVPN) >> HPTE64_V_AVPN_SHIFT)
#define HPTE64_V_COMPARE(x, y) (!(((x) ^ (y)) & 0xffffffffffffff83ULL))
#define HPTE64_V_BOLTED 0x0000000000000010ULL
#define HPTE64_V_LARGE 0x0000000000000004ULL
#define HPTE64_V_SECONDARY 0x0000000000000002ULL
#define HPTE64_V_VALID 0x0000000000000001ULL
#define HPTE64_R_PP0 0x8000000000000000ULL
#define HPTE64_R_TS 0x4000000000000000ULL
#define HPTE64_R_KEY_HI 0x3000000000000000ULL
#define HPTE64_R_RPN_SHIFT 12
#define HPTE64_R_RPN 0x0ffffffffffff000ULL
#define HPTE64_R_FLAGS 0x00000000000003ffULL
#define HPTE64_R_PP 0x0000000000000003ULL
#define HPTE64_R_N 0x0000000000000004ULL
#define HPTE64_R_G 0x0000000000000008ULL
#define HPTE64_R_M 0x0000000000000010ULL
#define HPTE64_R_I 0x0000000000000020ULL
#define HPTE64_R_W 0x0000000000000040ULL
#define HPTE64_R_WIMG 0x0000000000000078ULL
#define HPTE64_R_C 0x0000000000000080ULL
#define HPTE64_R_R 0x0000000000000100ULL
#define HPTE64_R_KEY_LO 0x0000000000000e00ULL
#define HPTE64_R_KEY(x) ((((x) & HPTE64_R_KEY_HI) >> 57) | \
(((x) & HPTE64_R_KEY_LO) >> 9))
#define HPTE64_V_1TB_SEG 0x4000000000000000ULL
#define HPTE64_V_VRMA_MASK 0x4001ffffff000000ULL
static inline hwaddr ppc_hash64_hpt_base(PowerPCCPU *cpu)
{
return cpu->env.spr[SPR_SDR1] & SDR_64_HTABORG;
}
static inline hwaddr ppc_hash64_hpt_mask(PowerPCCPU *cpu)
{
if (cpu->vhyp) {
PPCVirtualHypervisorClass *vhc =
PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
return vhc->hpt_mask(cpu->vhyp);
}
return (1ULL << ((cpu->env.spr[SPR_SDR1] & SDR_64_HTABSIZE) + 18 - 7)) - 1;
}
struct ppc_hash_pte64 {
uint64_t pte0, pte1;
};
const ppc_hash_pte64_t *ppc_hash64_map_hptes(PowerPCCPU *cpu,
hwaddr ptex, int n);
void ppc_hash64_unmap_hptes(PowerPCCPU *cpu, const ppc_hash_pte64_t *hptes,
hwaddr ptex, int n);
static inline uint64_t ppc_hash64_hpte0(PowerPCCPU *cpu,
const ppc_hash_pte64_t *hptes, int i)
{
return ldq_p(&(hptes[i].pte0));
}
static inline uint64_t ppc_hash64_hpte1(PowerPCCPU *cpu,
const ppc_hash_pte64_t *hptes, int i)
{
return ldq_p(&(hptes[i].pte1));
}
#endif /* CONFIG_USER_ONLY */
#endif /* MMU_HASH64_H */