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Commit 043cc4d7 authored by Scott Wood's avatar Scott Wood Committed by Avi Kivity
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KVM: PPC: factor out lpid allocator from book3s_64_mmu_hv 



We'll use it on e500mc as well.

Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 06aae867

arch/powerpc/include/asm/kvm_book3s.h

+3 −0
Original line number Diff line number Diff line
@@ -452,4 +452,7 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu) 


#define INS_DCBZ			0x7c0007ec



/* LPIDs we support with this build -- runtime limit may be lower */

#define KVMPPC_NR_LPIDS			(LPID_RSVD + 1)



#endif /* __ASM_KVM_BOOK3S_H__ */

arch/powerpc/include/asm/kvm_booke.h

+3 −0
Original line number Diff line number Diff line
@@ -23,6 +23,9 @@ 
#include <linux/types.h>

#include <linux/kvm_host.h>



/* LPIDs we support with this build -- runtime limit may be lower */

#define KVMPPC_NR_LPIDS                        64



static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)

{

	vcpu->arch.gpr[num] = val;

arch/powerpc/include/asm/kvm_ppc.h

+5 −0
Original line number Diff line number Diff line
@@ -204,4 +204,9 @@ int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu, 
int kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu *vcpu,

			     struct kvm_dirty_tlb *cfg);



long kvmppc_alloc_lpid(void);

void kvmppc_claim_lpid(long lpid);

void kvmppc_free_lpid(long lpid);

void kvmppc_init_lpid(unsigned long nr_lpids);



#endif /* __POWERPC_KVM_PPC_H__ */

arch/powerpc/kvm/book3s_64_mmu_hv.c

+10 −16
Original line number Diff line number Diff line
@@ -36,13 +36,11 @@ 


/* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */

#define MAX_LPID_970	63

#define NR_LPIDS	(LPID_RSVD + 1)

unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];



long kvmppc_alloc_hpt(struct kvm *kvm)

{

	unsigned long hpt;

	unsigned long lpid;

	long lpid;

	struct revmap_entry *rev;

	struct kvmppc_linear_info *li;
@@ -72,14 +70,9 @@ long kvmppc_alloc_hpt(struct kvm *kvm) 
	}

	kvm->arch.revmap = rev;



	/* Allocate the guest's logical partition ID */

	do {

		lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);

		if (lpid >= NR_LPIDS) {

			pr_err("kvm_alloc_hpt: No LPIDs free\n");

	lpid = kvmppc_alloc_lpid();

	if (lpid < 0)

		goto out_freeboth;

		}

	} while (test_and_set_bit(lpid, lpid_inuse));



	kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18);

	kvm->arch.lpid = lpid;
@@ -96,7 +89,7 @@ long kvmppc_alloc_hpt(struct kvm *kvm) 


void kvmppc_free_hpt(struct kvm *kvm)

{

	clear_bit(kvm->arch.lpid, lpid_inuse);

	kvmppc_free_lpid(kvm->arch.lpid);

	vfree(kvm->arch.revmap);

	if (kvm->arch.hpt_li)

		kvm_release_hpt(kvm->arch.hpt_li);
@@ -171,8 +164,7 @@ int kvmppc_mmu_hv_init(void) 
	if (!cpu_has_feature(CPU_FTR_HVMODE))

		return -EINVAL;



	memset(lpid_inuse, 0, sizeof(lpid_inuse));



	/* POWER7 has 10-bit LPIDs, PPC970 and e500mc have 6-bit LPIDs */

	if (cpu_has_feature(CPU_FTR_ARCH_206)) {

		host_lpid = mfspr(SPRN_LPID);	/* POWER7 */

		rsvd_lpid = LPID_RSVD;
@@ -181,9 +173,11 @@ int kvmppc_mmu_hv_init(void) 
		rsvd_lpid = MAX_LPID_970;

	}



	set_bit(host_lpid, lpid_inuse);

	kvmppc_init_lpid(rsvd_lpid + 1);



	kvmppc_claim_lpid(host_lpid);

	/* rsvd_lpid is reserved for use in partition switching */

	set_bit(rsvd_lpid, lpid_inuse);

	kvmppc_claim_lpid(rsvd_lpid);



	return 0;

}

arch/powerpc/kvm/powerpc.c

+34 −0
Original line number Diff line number Diff line
@@ -799,6 +799,40 @@ long kvm_arch_vm_ioctl(struct file *filp, 
	return r;

}



static unsigned long lpid_inuse[BITS_TO_LONGS(KVMPPC_NR_LPIDS)];

static unsigned long nr_lpids;



long kvmppc_alloc_lpid(void)

{

	long lpid;



	do {

		lpid = find_first_zero_bit(lpid_inuse, KVMPPC_NR_LPIDS);

		if (lpid >= nr_lpids) {

			pr_err("%s: No LPIDs free\n", __func__);

			return -ENOMEM;

		}

	} while (test_and_set_bit(lpid, lpid_inuse));



	return lpid;

}



void kvmppc_claim_lpid(long lpid)

{

	set_bit(lpid, lpid_inuse);

}



void kvmppc_free_lpid(long lpid)

{

	clear_bit(lpid, lpid_inuse);

}



void kvmppc_init_lpid(unsigned long nr_lpids_param)

{

	nr_lpids = min_t(unsigned long, KVMPPC_NR_LPIDS, nr_lpids_param);

	memset(lpid_inuse, 0, sizeof(lpid_inuse));

}



int kvm_arch_init(void *opaque)

{

	return 0;