diff options
| author | Cédric Le Goater <clg@kaod.org> | 2020-06-08 13:57:14 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2020-07-21 15:38:03 +1000 |
| commit | e55f4d5898a9855350834535037f62732bbd320a (patch) | |
| tree | 9c4654f6122b302c86099ab3dffb5b7898bc6a61 /arch | |
| parent | 4cb4ade19b4219af8f5cda9313dd99b0004c8b3c (diff) | |
| download | linux-e55f4d5898a9855350834535037f62732bbd320a.tar.bz2 | |
KVM: PPC: Book3S HV: Increase KVMPPC_NR_LPIDS on POWER8 and POWER9
POWER8 and POWER9 have 12-bit LPIDs. Change LPID_RSVD to support up to
(4096 - 2) guests on these processors. POWER7 is kept the same with a
limitation of (1024 - 2), but it might be time to drop KVM support for
POWER7.
Tested with 2048 guests * 4 vCPUs on a witherspoon system with 512G
RAM and a bit of swap.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_hv.c | 8 |
2 files changed, 8 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 28311e52d7e8..caef0483e9bb 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -473,7 +473,8 @@ #ifndef SPRN_LPID #define SPRN_LPID 0x13F /* Logical Partition Identifier */ #endif -#define LPID_RSVD 0x3ff /* Reserved LPID for partn switching */ +#define LPID_RSVD_POWER7 0x3ff /* Reserved LPID for partn switching */ +#define LPID_RSVD 0xfff /* Reserved LPID for partn switching */ #define SPRN_HMER 0x150 /* Hypervisor maintenance exception reg */ #define HMER_DEBUG_TRIG (1ul << (63 - 17)) /* Debug trigger */ #define SPRN_HMEER 0x151 /* Hyp maintenance exception enable reg */ diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 7c5a1812a1c3..38ea396a23d6 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -260,11 +260,15 @@ int kvmppc_mmu_hv_init(void) if (!mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE)) return -EINVAL; - /* POWER7 has 10-bit LPIDs (12-bit in POWER8) */ host_lpid = 0; if (cpu_has_feature(CPU_FTR_HVMODE)) host_lpid = mfspr(SPRN_LPID); - rsvd_lpid = LPID_RSVD; + + /* POWER8 and above have 12-bit LPIDs (10-bit in POWER7) */ + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + rsvd_lpid = LPID_RSVD; + else + rsvd_lpid = LPID_RSVD_POWER7; kvmppc_init_lpid(rsvd_lpid + 1); |