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Juergen Gross
7bf74582b3
In order to be able to migrate pv-domains with more than 512 GB of RAM the p2m information can be specified by the guest kernel via a virtual mapped linear p2m list instead of a 3 level tree. Add support for this new p2m format in libxc. As the sanity checking of the virtual p2m address needs defines for the xen regions use those defines when doing page table checks as well. There were two harmless off by one errors in normalise_pagetable() being fixed by using those defines (xen_last set to 512 instead of 511), the other one is fixed directly. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com>
110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
#ifndef __COMMON_X86_PV_H
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#define __COMMON_X86_PV_H
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#include "xc_sr_common_x86.h"
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/* Virtual address ranges reserved for hypervisor. */
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#define HYPERVISOR_VIRT_START_X86_64 0xFFFF800000000000ULL
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#define HYPERVISOR_VIRT_END_X86_64 0xFFFF87FFFFFFFFFFULL
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#define HYPERVISOR_VIRT_START_X86_32 0x00000000F5800000ULL
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#define HYPERVISOR_VIRT_END_X86_32 0x00000000FFFFFFFFULL
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/*
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* Convert an mfn to a pfn, given Xen's m2p table.
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*
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* Caller must ensure that the requested mfn is in range.
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*/
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xen_pfn_t mfn_to_pfn(struct xc_sr_context *ctx, xen_pfn_t mfn);
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/*
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* Query whether a particular mfn is valid in the physmap of a guest.
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*/
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bool mfn_in_pseudophysmap(struct xc_sr_context *ctx, xen_pfn_t mfn);
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/*
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* Debug a particular mfn by walking the p2m and m2p.
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*/
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void dump_bad_pseudophysmap_entry(struct xc_sr_context *ctx, xen_pfn_t mfn);
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/*
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* Convert a PV cr3 field to an mfn.
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*
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* Adjusts for Xen's extended-cr3 format to pack a 44bit physical address into
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* a 32bit architectural cr3.
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*/
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xen_pfn_t cr3_to_mfn(struct xc_sr_context *ctx, uint64_t cr3);
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/*
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* Convert an mfn to a PV cr3 field.
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*
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* Adjusts for Xen's extended-cr3 format to pack a 44bit physical address into
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* a 32bit architectural cr3.
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*/
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uint64_t mfn_to_cr3(struct xc_sr_context *ctx, xen_pfn_t mfn);
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/* Bits 12 through 51 of a PTE point at the frame */
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#define PTE_FRAME_MASK 0x000ffffffffff000ULL
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/*
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* Extract an mfn from a Pagetable Entry. May return INVALID_MFN if the pte
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* would overflow a 32bit xen_pfn_t.
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*/
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static inline xen_pfn_t pte_to_frame(uint64_t pte)
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{
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uint64_t frame = (pte & PTE_FRAME_MASK) >> PAGE_SHIFT;
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#ifdef __i386__
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if ( frame >= INVALID_MFN )
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return INVALID_MFN;
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#endif
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return frame;
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}
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/*
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* Change the frame in a Pagetable Entry while leaving the flags alone.
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*/
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static inline uint64_t merge_pte(uint64_t pte, xen_pfn_t mfn)
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{
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return (pte & ~PTE_FRAME_MASK) | ((uint64_t)mfn << PAGE_SHIFT);
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}
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/*
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* Get current domain information.
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*
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* Fills ctx->x86_pv
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* - .width
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* - .levels
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* - .fpp
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* - .p2m_frames
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*
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* Used by the save side to create the X86_PV_INFO record, and by the restore
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* side to verify the incoming stream.
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*
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* Returns 0 on success and non-zero on error.
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*/
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int x86_pv_domain_info(struct xc_sr_context *ctx);
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/*
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* Maps the Xen M2P.
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*
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* Fills ctx->x86_pv.
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* - .max_mfn
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* - .m2p
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*
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* Returns 0 on success and non-zero on error.
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*/
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int x86_pv_map_m2p(struct xc_sr_context *ctx);
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#endif
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/*
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* Local variables:
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* mode: C
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* c-file-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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