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Commit e71b2a39 authored by Alexander Graf's avatar Alexander Graf Committed by Benjamin Herrenschmidt
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Add book3s_64 guest MMU 



To be able to run a guest, we also need to implement a guest MMU.

This patch adds MMU handling for Book3s_64 guests.

Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 0d8dc681

arch/powerpc/kvm/book3s_64_mmu.c

0 → 100644
+476 −0
Original line number Diff line number Diff line 
/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License, version 2, as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 *

 * Copyright SUSE Linux Products GmbH 2009

 *

 * Authors: Alexander Graf <agraf@suse.de>

 */



#include <linux/types.h>

#include <linux/string.h>

#include <linux/kvm.h>

#include <linux/kvm_host.h>

#include <linux/highmem.h>



#include <asm/tlbflush.h>

#include <asm/kvm_ppc.h>

#include <asm/kvm_book3s.h>



/* #define DEBUG_MMU */



#ifdef DEBUG_MMU

#define dprintk(X...) printk(KERN_INFO X)

#else

#define dprintk(X...) do { } while(0)

#endif



static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)

{

	kvmppc_set_msr(vcpu, MSR_SF);

}



static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(

				struct kvmppc_vcpu_book3s *vcpu_book3s,

				gva_t eaddr)

{

	int i;

	u64 esid = GET_ESID(eaddr);

	u64 esid_1t = GET_ESID_1T(eaddr);



	for (i = 0; i < vcpu_book3s->slb_nr; i++) {

		u64 cmp_esid = esid;



		if (!vcpu_book3s->slb[i].valid)

			continue;



		if (vcpu_book3s->slb[i].large)

			cmp_esid = esid_1t;



		if (vcpu_book3s->slb[i].esid == cmp_esid)

			return &vcpu_book3s->slb[i];

	}



	dprintk("KVM: No SLB entry found for 0x%lx [%llx | %llx]\n",

		eaddr, esid, esid_1t);

	for (i = 0; i < vcpu_book3s->slb_nr; i++) {

	    if (vcpu_book3s->slb[i].vsid)

		dprintk("  %d: %c%c %llx %llx\n", i,

			vcpu_book3s->slb[i].valid ? 'v' : ' ',

			vcpu_book3s->slb[i].large ? 'l' : ' ',

			vcpu_book3s->slb[i].esid,

			vcpu_book3s->slb[i].vsid);

	}



	return NULL;

}



static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,

					 bool data)

{

	struct kvmppc_slb *slb;



	slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), eaddr);

	if (!slb)

		return 0;



	if (slb->large)

		return (((u64)eaddr >> 12) & 0xfffffff) |

		       (((u64)slb->vsid) << 28);



	return (((u64)eaddr >> 12) & 0xffff) | (((u64)slb->vsid) << 16);

}



static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe)

{

	return slbe->large ? 24 : 12;

}



static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)

{

	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);

	return ((eaddr & 0xfffffff) >> p);

}



static hva_t kvmppc_mmu_book3s_64_get_pteg(

				struct kvmppc_vcpu_book3s *vcpu_book3s,

				struct kvmppc_slb *slbe, gva_t eaddr,

				bool second)

{

	u64 hash, pteg, htabsize;

	u32 page;

	hva_t r;



	page = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);

	htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1);



	hash = slbe->vsid ^ page;

	if (second)

		hash = ~hash;

	hash &= ((1ULL << 39ULL) - 1ULL);

	hash &= htabsize;

	hash <<= 7ULL;



	pteg = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;

	pteg |= hash;



	dprintk("MMU: page=0x%x sdr1=0x%llx pteg=0x%llx vsid=0x%llx\n",

		page, vcpu_book3s->sdr1, pteg, slbe->vsid);



	r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);

	if (kvm_is_error_hva(r))

		return r;

	return r | (pteg & ~PAGE_MASK);

}



static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr)

{

	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);

	u64 avpn;



	avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);

	avpn |= slbe->vsid << (28 - p);



	if (p < 24)

		avpn >>= ((80 - p) - 56) - 8;

	else

		avpn <<= 8;



	return avpn;

}



static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,

				struct kvmppc_pte *gpte, bool data)

{

	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);

	struct kvmppc_slb *slbe;

	hva_t ptegp;

	u64 pteg[16];

	u64 avpn = 0;

	int i;

	u8 key = 0;

	bool found = false;

	bool perm_err = false;

	int second = 0;



	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, eaddr);

	if (!slbe)

		goto no_seg_found;



do_second:

	ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second);

	if (kvm_is_error_hva(ptegp))

		goto no_page_found;



	avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr);



	if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {

		printk(KERN_ERR "KVM can't copy data from 0x%lx!\n", ptegp);

		goto no_page_found;

	}



	if ((vcpu->arch.msr & MSR_PR) && slbe->Kp)

		key = 4;

	else if (!(vcpu->arch.msr & MSR_PR) && slbe->Ks)

		key = 4;



	for (i=0; i<16; i+=2) {

		u64 v = pteg[i];

		u64 r = pteg[i+1];



		/* Valid check */

		if (!(v & HPTE_V_VALID))

			continue;

		/* Hash check */

		if ((v & HPTE_V_SECONDARY) != second)

			continue;



		/* AVPN compare */

		if (HPTE_V_AVPN_VAL(avpn) == HPTE_V_AVPN_VAL(v)) {

			u8 pp = (r & HPTE_R_PP) | key;

			int eaddr_mask = 0xFFF;



			gpte->eaddr = eaddr;

			gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu,

								    eaddr,

								    data);

			if (slbe->large)

				eaddr_mask = 0xFFFFFF;

			gpte->raddr = (r & HPTE_R_RPN) | (eaddr & eaddr_mask);

			gpte->may_execute = ((r & HPTE_R_N) ? false : true);

			gpte->may_read = false;

			gpte->may_write = false;



			switch (pp) {

			case 0:

			case 1:

			case 2:

			case 6:

				gpte->may_write = true;

				/* fall through */

			case 3:

			case 5:

			case 7:

				gpte->may_read = true;

				break;

			}



			if (!gpte->may_read) {

				perm_err = true;

				continue;

			}



			dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "

				"-> 0x%llx\n",

				eaddr, avpn, gpte->vpage, gpte->raddr);

			found = true;

			break;

		}

	}



	/* Update PTE R and C bits, so the guest's swapper knows we used the

	 * page */

	if (found) {

		u32 oldr = pteg[i+1];



		if (gpte->may_read) {

			/* Set the accessed flag */

			pteg[i+1] |= HPTE_R_R;

		}

		if (gpte->may_write) {

			/* Set the dirty flag */

			pteg[i+1] |= HPTE_R_C;

		} else {

			dprintk("KVM: Mapping read-only page!\n");

		}



		/* Write back into the PTEG */

		if (pteg[i+1] != oldr)

			copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));



		return 0;

	} else {

		dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx "

			"ptegp=0x%lx)\n",

			eaddr, to_book3s(vcpu)->sdr1, ptegp);

		for (i = 0; i < 16; i += 2)

			dprintk("   %02d: 0x%llx - 0x%llx (0x%llx)\n",

				i, pteg[i], pteg[i+1], avpn);



		if (!second) {

			second = HPTE_V_SECONDARY;

			goto do_second;

		}

	}





no_page_found:





	if (perm_err)

		return -EPERM;



	return -ENOENT;



no_seg_found:



	dprintk("KVM MMU: Trigger segment fault\n");

	return -EINVAL;

}



static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)

{

	struct kvmppc_vcpu_book3s *vcpu_book3s;

	u64 esid, esid_1t;

	int slb_nr;

	struct kvmppc_slb *slbe;



	dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb);



	vcpu_book3s = to_book3s(vcpu);



	esid = GET_ESID(rb);

	esid_1t = GET_ESID_1T(rb);

	slb_nr = rb & 0xfff;



	if (slb_nr > vcpu_book3s->slb_nr)

		return;



	slbe = &vcpu_book3s->slb[slb_nr];



	slbe->large = (rs & SLB_VSID_L) ? 1 : 0;

	slbe->esid  = slbe->large ? esid_1t : esid;

	slbe->vsid  = rs >> 12;

	slbe->valid = (rb & SLB_ESID_V) ? 1 : 0;

	slbe->Ks    = (rs & SLB_VSID_KS) ? 1 : 0;

	slbe->Kp    = (rs & SLB_VSID_KP) ? 1 : 0;

	slbe->nx    = (rs & SLB_VSID_N) ? 1 : 0;

	slbe->class = (rs & SLB_VSID_C) ? 1 : 0;



	slbe->orige = rb & (ESID_MASK | SLB_ESID_V);

	slbe->origv = rs;



	/* Map the new segment */

	kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT);

}



static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr)

{

	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);

	struct kvmppc_slb *slbe;



	if (slb_nr > vcpu_book3s->slb_nr)

		return 0;



	slbe = &vcpu_book3s->slb[slb_nr];



	return slbe->orige;

}



static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr)

{

	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);

	struct kvmppc_slb *slbe;



	if (slb_nr > vcpu_book3s->slb_nr)

		return 0;



	slbe = &vcpu_book3s->slb[slb_nr];



	return slbe->origv;

}



static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea)

{

	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);

	struct kvmppc_slb *slbe;



	dprintk("KVM MMU: slbie(0x%llx)\n", ea);



	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, ea);



	if (!slbe)

		return;



	dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid);



	slbe->valid = false;



	kvmppc_mmu_map_segment(vcpu, ea);

}



static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)

{

	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);

	int i;



	dprintk("KVM MMU: slbia()\n");



	for (i = 1; i < vcpu_book3s->slb_nr; i++)

		vcpu_book3s->slb[i].valid = false;



	if (vcpu->arch.msr & MSR_IR) {

		kvmppc_mmu_flush_segments(vcpu);

		kvmppc_mmu_map_segment(vcpu, vcpu->arch.pc);

	}

}



static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,

					ulong value)

{

	u64 rb = 0, rs = 0;



	/* ESID = srnum */

	rb |= (srnum & 0xf) << 28;

	/* Set the valid bit */

	rb |= 1 << 27;

	/* Index = ESID */

	rb |= srnum;



	/* VSID = VSID */

	rs |= (value & 0xfffffff) << 12;

	/* flags = flags */

	rs |= ((value >> 27) & 0xf) << 9;



	kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb);

}



static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va,

				       bool large)

{

	u64 mask = 0xFFFFFFFFFULL;



	dprintk("KVM MMU: tlbie(0x%lx)\n", va);



	if (large)

		mask = 0xFFFFFF000ULL;

	kvmppc_mmu_pte_vflush(vcpu, va >> 12, mask);

}



static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid,

					     u64 *vsid)

{

	switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) {

	case 0:

		*vsid = (VSID_REAL >> 16) | esid;

		break;

	case MSR_IR:

		*vsid = (VSID_REAL_IR >> 16) | esid;

		break;

	case MSR_DR:

		*vsid = (VSID_REAL_DR >> 16) | esid;

		break;

	case MSR_DR|MSR_IR:

	{

		ulong ea;

		struct kvmppc_slb *slb;

		ea = esid << SID_SHIFT;

		slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea);

		if (slb)

			*vsid = slb->vsid;

		else

			return -ENOENT;



		break;

	}

	default:

		BUG();

		break;

	}



	return 0;

}



static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu)

{

	return (to_book3s(vcpu)->hid[5] & 0x80);

}



void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu)

{

	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;



	mmu->mfsrin = NULL;

	mmu->mtsrin = kvmppc_mmu_book3s_64_mtsrin;

	mmu->slbmte = kvmppc_mmu_book3s_64_slbmte;

	mmu->slbmfee = kvmppc_mmu_book3s_64_slbmfee;

	mmu->slbmfev = kvmppc_mmu_book3s_64_slbmfev;

	mmu->slbie = kvmppc_mmu_book3s_64_slbie;

	mmu->slbia = kvmppc_mmu_book3s_64_slbia;

	mmu->xlate = kvmppc_mmu_book3s_64_xlate;

	mmu->reset_msr = kvmppc_mmu_book3s_64_reset_msr;

	mmu->tlbie = kvmppc_mmu_book3s_64_tlbie;

	mmu->esid_to_vsid = kvmppc_mmu_book3s_64_esid_to_vsid;

	mmu->ea_to_vp = kvmppc_mmu_book3s_64_ea_to_vp;

	mmu->is_dcbz32 = kvmppc_mmu_book3s_64_is_dcbz32;

}