book3s_64_vio_hv.c

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/*
 * 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 2010 Paul Mackerras, IBM Corp. <[email protected]>
 * Copyright 2011 David Gibson, IBM Corporation <[email protected]>
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/highmem.h>
#include <linux/gfp.h>
#include <linux/slab.h>
#include <linux/hugetlb.h>
#include <linux/list.h>

#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu-hash64.h>
#include <asm/hvcall.h>
#include <asm/synch.h>
#include <asm/ppc-opcode.h>
#include <asm/kvm_host.h>
#include <asm/udbg.h>

#define TCES_PER_PAGE   (PAGE_SIZE / sizeof(u64))

/* WARNING: This will be called in real-mode on HV KVM and virtual
 *          mode on PR KVM
 */
long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
              unsigned long ioba, unsigned long tce)
{
    struct kvm *kvm = vcpu->kvm;
    struct kvmppc_spapr_tce_table *stt;

    /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
    /*      liobn, ioba, tce); */

    list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
        if (stt->liobn == liobn) {
            unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
            struct page *page;
            u64 *tbl;

            /* udbg_printf("H_PUT_TCE: liobn 0x%lx => stt=%p  window_size=0x%x\n", */
            /*      liobn, stt, stt->window_size); */
            if (ioba >= stt->window_size)
                return H_PARAMETER;

            page = stt->pages[idx / TCES_PER_PAGE];
            tbl = (u64 *)page_address(page);

            /* FIXME: Need to validate the TCE itself */
            /* udbg_printf("tce @ %p\n", &tbl[idx % TCES_PER_PAGE]); */
            tbl[idx % TCES_PER_PAGE] = tce;
            return H_SUCCESS;
        }
    }

    /* Didn't find the liobn, punt it to userspace */
    return H_TOO_HARD;
}