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https://github.com/xen-project/xen.git
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Keir Fraser
c7f3f82a65
different bitness than dom0 (32-bit vs 64-bit). Original patch by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Keir Fraser <keir@xen.org>
115 lines
3.7 KiB
C
115 lines
3.7 KiB
C
/******************************************************************************
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* xc_pagetab.c
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*
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* Function to translate virtual to physical addresses.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xc_private.h"
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#include <xen/hvm/save.h>
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#define CR0_PG 0x80000000
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#define CR4_PAE 0x20
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#define PTE_PSE 0x80
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#define EFER_LMA 0x400
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unsigned long xc_translate_foreign_address(xc_interface *xch, uint32_t dom,
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int vcpu, unsigned long long virt)
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{
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xc_dominfo_t dominfo;
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uint64_t paddr, mask, pte = 0;
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int size, level, pt_levels = 2;
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void *map;
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if (xc_domain_getinfo(xch, dom, 1, &dominfo) != 1
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|| dominfo.domid != dom)
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return 0;
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/* What kind of paging are we dealing with? */
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if (dominfo.hvm) {
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struct hvm_hw_cpu ctx;
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if (xc_domain_hvm_getcontext_partial(xch, dom,
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HVM_SAVE_CODE(CPU), vcpu,
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&ctx, sizeof ctx) != 0)
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return 0;
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if (!(ctx.cr0 & CR0_PG))
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return virt >> PAGE_SHIFT;
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pt_levels = (ctx.msr_efer&EFER_LMA) ? 4 : (ctx.cr4&CR4_PAE) ? 3 : 2;
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paddr = ctx.cr3 & ((pt_levels == 3) ? ~0x1full : ~0xfffull);
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} else {
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DECLARE_DOMCTL;
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vcpu_guest_context_any_t ctx;
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if (xc_vcpu_getcontext(xch, dom, vcpu, &ctx) != 0)
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return 0;
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domctl.domain = dom;
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domctl.cmd = XEN_DOMCTL_get_address_size;
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if ( do_domctl(xch, &domctl) != 0 )
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return 0;
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if (domctl.u.address_size.size == 64) {
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pt_levels = 4;
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paddr = (uint64_t)xen_cr3_to_pfn_x86_64(ctx.x64.ctrlreg[3])
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<< PAGE_SHIFT;
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} else {
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pt_levels = 3;
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paddr = (uint64_t)xen_cr3_to_pfn_x86_32(ctx.x32.ctrlreg[3])
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<< PAGE_SHIFT;
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}
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}
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if (pt_levels == 4) {
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virt &= 0x0000ffffffffffffull;
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mask = 0x0000ff8000000000ull;
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} else if (pt_levels == 3) {
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virt &= 0x00000000ffffffffull;
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mask = 0x0000007fc0000000ull;
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} else {
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virt &= 0x00000000ffffffffull;
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mask = 0x00000000ffc00000ull;
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}
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size = (pt_levels == 2 ? 4 : 8);
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/* Walk the pagetables */
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for (level = pt_levels; level > 0; level--) {
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paddr += ((virt & mask) >> (xc_ffs64(mask) - 1)) * size;
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map = xc_map_foreign_range(xch, dom, PAGE_SIZE, PROT_READ,
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paddr >>PAGE_SHIFT);
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if (!map)
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return 0;
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memcpy(&pte, map + (paddr & (PAGE_SIZE - 1)), size);
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munmap(map, PAGE_SIZE);
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if (!(pte & 1))
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return 0;
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paddr = pte & 0x000ffffffffff000ull;
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if (level == 2 && (pte & PTE_PSE)) {
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mask = ((mask ^ ~-mask) >> 1); /* All bits below first set bit */
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return ((paddr & ~mask) | (virt & mask)) >> PAGE_SHIFT;
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}
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mask >>= (pt_levels == 2 ? 10 : 9);
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}
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return paddr >> PAGE_SHIFT;
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}
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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