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/*
* 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, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*/
#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/perfc.h>
#include <asm/hvm/svm/asid.h>
#include <asm/amd.h>
void svm_asid_init(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;
bool_t need_flush = hvm_asid_handle_vmenter();
/* ASID 0 indicates that ASIDs are disabled. */
if ( curr->arch.hvm_vcpu.asid == 0 )
{
curr->arch.hvm_svm.vmcb->guest_asid = 1;
curr->arch.hvm_svm.vmcb->tlb_control = 1;
return;
}
curr->arch.hvm_svm.vmcb->guest_asid = curr->arch.hvm_vcpu.asid;
curr->arch.hvm_svm.vmcb->tlb_control = need_flush;
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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