/*

 * asid.c: handling ASIDs in SVM.

 * Copyright (c) 2007, Advanced Micro Devices, Inc.

 *

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

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.

 */

#include <xen/init.h>

#include <xen/lib.h>

#include <xen/perfc.h>

#include <asm/hvm/svm/asid.h>

#include <asm/amd.h>

#include <asm/hvm/nestedhvm.h>

void svm_asid_init(const struct cpuinfo_x86 *c)

{

    int nasids = 0;

    /* Check for erratum #170, and leave ASIDs disabled if it's present. */

    if ( !cpu_has_amd_erratum(c, AMD_ERRATUM_170) )

        nasids = cpuid_ebx(0x8000000A);

    hvm_asid_init(nasids);

}

/*

 * Called directly before VMRUN.  Checks if the VCPU needs a new ASID,

 * assigns it, and if required, issues required TLB flushes.

 */

void svm_asid_handle_vmrun(void)

{

    struct vcpu *curr = current;

    struct vmcb_struct *vmcb = curr->arch.hvm_svm.vmcb;

    struct hvm_vcpu_asid *p_asid =

        nestedhvm_vcpu_in_guestmode(curr)

        ? &vcpu_nestedhvm(curr).nv_n2asid : &curr->arch.hvm_vcpu.n1asid;

    bool_t need_flush = hvm_asid_handle_vmenter(p_asid);

    /* ASID 0 indicates that ASIDs are disabled. */

    if ( p_asid->asid == 0 )

    {

        vmcb_set_guest_asid(vmcb, 1);

        vmcb->tlb_control = 1;

        return;

    }

    if (vmcb_get_guest_asid(vmcb) != p_asid->asid)

        vmcb_set_guest_asid(vmcb, p_asid->asid);

    vmcb->tlb_control = need_flush;

}

/*

 * Local variables:

 * mode: C

 * c-file-style: "BSD"

 * c-basic-offset: 4

 * tab-width: 4

 * indent-tabs-mode: nil

 * End:

 */