Add book3s_32 guest MMU

/*

 * 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 */

/* #define DEBUG_MMU_PTE */

/* #define DEBUG_MMU_PTE_IP 0xfff14c40 */

#ifdef DEBUG_MMU

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

#else

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

#endif

#ifdef DEBUG_PTE

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

#else

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

#endif

#define PTEG_FLAG_ACCESSED	0x00000100

#define PTEG_FLAG_DIRTY		0x00000080

static inline bool check_debug_ip(struct kvm_vcpu *vcpu)

{

#ifdef DEBUG_MMU_PTE_IP

	return vcpu->arch.pc == DEBUG_MMU_PTE_IP;

#else

	return true;

#endif

}

static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,

					  struct kvmppc_pte *pte, bool data);

static struct kvmppc_sr *find_sr(struct kvmppc_vcpu_book3s *vcpu_book3s, gva_t eaddr)

{

	return &vcpu_book3s->sr[(eaddr >> 28) & 0xf];

}

static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,

					 bool data)

{

	struct kvmppc_sr *sre = find_sr(to_book3s(vcpu), eaddr);

	struct kvmppc_pte pte;

	if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data))

		return pte.vpage;

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

}

static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)

{

	kvmppc_set_msr(vcpu, 0);

}

static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s,

				      struct kvmppc_sr *sre, gva_t eaddr,

				      bool primary)

{

	u32 page, hash, pteg, htabmask;

	hva_t r;

	page = (eaddr & 0x0FFFFFFF) >> 12;

	htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0;

	hash = ((sre->vsid ^ page) << 6);

	if (!primary)

		hash = ~hash;

	hash &= htabmask;

	pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash;

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

		vcpu_book3s->vcpu.arch.pc, eaddr, vcpu_book3s->sdr1, pteg,

		sre->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 u32 kvmppc_mmu_book3s_32_get_ptem(struct kvmppc_sr *sre, gva_t eaddr,

				    bool primary)

{

	return ((eaddr & 0x0fffffff) >> 22) | (sre->vsid << 7) |

	       (primary ? 0 : 0x40) | 0x80000000;

}

static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,

					  struct kvmppc_pte *pte, bool data)

{

	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);

	struct kvmppc_bat *bat;

	int i;

	for (i = 0; i < 8; i++) {

		if (data)

			bat = &vcpu_book3s->dbat[i];

		else

			bat = &vcpu_book3s->ibat[i];

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

			if (!bat->vp)

				continue;

		} else {

			if (!bat->vs)

				continue;

		}

		if (check_debug_ip(vcpu))

		{

			dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",

				    data ? 'd' : 'i', i, eaddr, bat->bepi,

				    bat->bepi_mask);

		}

		if ((eaddr & bat->bepi_mask) == bat->bepi) {

			pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask);

			pte->vpage = (eaddr >> 12) | VSID_BAT;

			pte->may_read = bat->pp;

			pte->may_write = bat->pp > 1;

			pte->may_execute = true;

			if (!pte->may_read) {

				printk(KERN_INFO "BAT is not readable!\n");

				continue;

			}

			if (!pte->may_write) {

				/* let's treat r/o BATs as not-readable for now */

				dprintk_pte("BAT is read-only!\n");

				continue;

			}

			return 0;

		}

	}

	return -ENOENT;

}

static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,

				     struct kvmppc_pte *pte, bool data,

				     bool primary)

{

	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);

	struct kvmppc_sr *sre;

	hva_t ptegp;

	u32 pteg[16];

	u64 ptem = 0;

	int i;

	int found = 0;

	sre = find_sr(vcpu_book3s, eaddr);

	dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,

		    sre->vsid, sre->raw);

	pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);

	ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary);

	if (kvm_is_error_hva(ptegp)) {

		printk(KERN_INFO "KVM: Invalid PTEG!\n");

		goto no_page_found;

	}

	ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);

	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;

	}

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

		if (ptem == pteg[i]) {

			u8 pp;

			pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF);

			pp = pteg[i+1] & 3;

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

			    (sre->Ks && !(vcpu->arch.msr & MSR_PR)))

				pp |= 4;

			pte->may_write = false;

			pte->may_read = false;

			pte->may_execute = true;

			switch (pp) {

				case 0:

				case 1:

				case 2:

				case 6:

					pte->may_write = true;

				case 3:

				case 5:

				case 7:

					pte->may_read = true;

					break;

			}

			if ( !pte->may_read )

				continue;

			dprintk_pte("MMU: Found PTE -> %x %x - %x\n",

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

			found = 1;

			break;

		}

	}

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

	   page */

	if (found) {

		u32 oldpte = pteg[i+1];

		if (pte->may_read)

			pteg[i+1] |= PTEG_FLAG_ACCESSED;

		if (pte->may_write)

			pteg[i+1] |= PTEG_FLAG_DIRTY;

		else

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

		/* Write back into the PTEG */

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

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

		return 0;

	}

no_page_found:

	if (check_debug_ip(vcpu)) {

		dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",

			    to_book3s(vcpu)->sdr1, ptegp);

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

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

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

		}

	}

	return -ENOENT;

}

static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,

				      struct kvmppc_pte *pte, bool data)

{

	int r;

	pte->eaddr = eaddr;

	r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data);

	if (r < 0)

	       r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true);

	if (r < 0)

	       r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, false);

	return r;

}

static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)

{

	return to_book3s(vcpu)->sr[srnum].raw;

}

static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,

					ulong value)

{

	struct kvmppc_sr *sre;

	sre = &to_book3s(vcpu)->sr[srnum];

	/* Flush any left-over shadows from the previous SR */

	/* XXX Not necessary? */

	/* kvmppc_mmu_pte_flush(vcpu, ((u64)sre->vsid) << 28, 0xf0000000ULL); */

	/* And then put in the new SR */

	sre->raw = value;

	sre->vsid = (value & 0x0fffffff);

	sre->Ks = (value & 0x40000000) ? true : false;

	sre->Kp = (value & 0x20000000) ? true : false;

	sre->nx = (value & 0x10000000) ? true : false;

	/* Map the new segment */

	kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);

}

static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)

{

	kvmppc_mmu_pte_flush(vcpu, ea, ~0xFFFULL);

}

static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid,

					     u64 *vsid)

{

	/* In case we only have one of MSR_IR or MSR_DR set, let's put

	   that in the real-mode context (and hope RM doesn't access

	   high memory) */

	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;

		ea = esid << SID_SHIFT;

		*vsid = find_sr(to_book3s(vcpu), ea)->vsid;

		break;

	}

	default:

		BUG();

	}

	return 0;

}

static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)

{

	return true;

}

void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu)

{

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

	mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin;

	mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin;

	mmu->xlate = kvmppc_mmu_book3s_32_xlate;

	mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr;

	mmu->tlbie = kvmppc_mmu_book3s_32_tlbie;

	mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid;

	mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp;

	mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32;

	mmu->slbmte = NULL;

	mmu->slbmfee = NULL;

	mmu->slbmfev = NULL;

	mmu->slbie = NULL;

	mmu->slbia = NULL;

}