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https://github.com/xen-project/xen.git
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kaf24@firebug.cl.cam.ac.uk
76d7931a0b
Batch p.t. pin requests during guest restore (after being suspended, or after migration). Allow L1 tables to be pinned even after their va backptr is fixed (no longer mutable). Signed-off-by: Keir Fraser <keir@xensource.com>
369 lines
8.7 KiB
C
369 lines
8.7 KiB
C
/******************************************************************************
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* xc_private.c
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*
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* Helper functions for the rest of the library.
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*/
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#include <zlib.h>
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#include "xc_private.h"
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void *xc_map_foreign_batch(int xc_handle, u32 dom, int prot,
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unsigned long *arr, int num )
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{
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privcmd_mmapbatch_t ioctlx;
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void *addr;
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addr = mmap(NULL, num*PAGE_SIZE, prot, MAP_SHARED, xc_handle, 0);
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if ( addr != NULL )
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{
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ioctlx.num=num;
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ioctlx.dom=dom;
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ioctlx.addr=(unsigned long)addr;
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ioctlx.arr=arr;
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if ( ioctl( xc_handle, IOCTL_PRIVCMD_MMAPBATCH, &ioctlx ) < 0 )
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{
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perror("XXXXXXXX");
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munmap(addr, num*PAGE_SIZE);
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return 0;
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}
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}
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return addr;
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}
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/*******************/
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void *xc_map_foreign_range(int xc_handle, u32 dom,
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int size, int prot,
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unsigned long mfn )
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{
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privcmd_mmap_t ioctlx;
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privcmd_mmap_entry_t entry;
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void *addr;
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addr = mmap(NULL, size, prot, MAP_SHARED, xc_handle, 0);
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if ( addr != NULL )
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{
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ioctlx.num=1;
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ioctlx.dom=dom;
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ioctlx.entry=&entry;
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entry.va=(unsigned long) addr;
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entry.mfn=mfn;
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entry.npages=(size+PAGE_SIZE-1)>>PAGE_SHIFT;
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if ( ioctl( xc_handle, IOCTL_PRIVCMD_MMAP, &ioctlx ) < 0 )
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{
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munmap(addr, size);
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return 0;
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}
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}
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return addr;
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}
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/*******************/
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/* NB: arr must be mlock'ed */
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int get_pfn_type_batch(int xc_handle,
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u32 dom, int num, unsigned long *arr)
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{
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dom0_op_t op;
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op.cmd = DOM0_GETPAGEFRAMEINFO2;
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op.u.getpageframeinfo2.domain = (domid_t)dom;
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op.u.getpageframeinfo2.num = num;
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op.u.getpageframeinfo2.array = arr;
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return do_dom0_op(xc_handle, &op);
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}
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#define GETPFN_ERR (~0U)
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unsigned int get_pfn_type(int xc_handle,
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unsigned long mfn,
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u32 dom)
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{
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dom0_op_t op;
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op.cmd = DOM0_GETPAGEFRAMEINFO;
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op.u.getpageframeinfo.pfn = mfn;
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op.u.getpageframeinfo.domain = (domid_t)dom;
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if ( do_dom0_op(xc_handle, &op) < 0 )
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{
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PERROR("Unexpected failure when getting page frame info!");
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return GETPFN_ERR;
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}
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return op.u.getpageframeinfo.type;
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}
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/*******************/
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int pin_table(
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int xc_handle, unsigned int type, unsigned long mfn, domid_t dom)
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{
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struct mmuext_op op;
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op.cmd = type;
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op.mfn = mfn;
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if ( do_mmuext_op(xc_handle, &op, 1, dom) < 0 )
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return 1;
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return 0;
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}
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static int flush_mmu_updates(int xc_handle, mmu_t *mmu)
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{
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int err = 0;
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privcmd_hypercall_t hypercall;
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if ( mmu->idx == 0 )
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return 0;
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hypercall.op = __HYPERVISOR_mmu_update;
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hypercall.arg[0] = (unsigned long)mmu->updates;
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hypercall.arg[1] = (unsigned long)mmu->idx;
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hypercall.arg[2] = 0;
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hypercall.arg[3] = mmu->subject;
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if ( mlock(mmu->updates, sizeof(mmu->updates)) != 0 )
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{
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PERROR("Could not lock pagetable update array");
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err = 1;
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goto out;
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}
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if ( do_xen_hypercall(xc_handle, &hypercall) < 0 )
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{
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ERROR("Failure when submitting mmu updates");
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err = 1;
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}
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mmu->idx = 0;
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(void)munlock(mmu->updates, sizeof(mmu->updates));
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out:
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return err;
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}
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mmu_t *init_mmu_updates(int xc_handle, domid_t dom)
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{
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mmu_t *mmu = malloc(sizeof(mmu_t));
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if ( mmu == NULL )
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return mmu;
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mmu->idx = 0;
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mmu->subject = dom;
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return mmu;
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}
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int add_mmu_update(int xc_handle, mmu_t *mmu,
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unsigned long ptr, unsigned long val)
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{
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mmu->updates[mmu->idx].ptr = ptr;
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mmu->updates[mmu->idx].val = val;
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if ( ++mmu->idx == MAX_MMU_UPDATES )
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return flush_mmu_updates(xc_handle, mmu);
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return 0;
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}
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int finish_mmu_updates(int xc_handle, mmu_t *mmu)
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{
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return flush_mmu_updates(xc_handle, mmu);
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}
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long long xc_domain_get_cpu_usage( int xc_handle, domid_t domid, int vcpu )
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{
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dom0_op_t op;
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op.cmd = DOM0_GETDOMAININFO;
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op.u.getdomaininfo.domain = (domid_t)domid;
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op.u.getdomaininfo.exec_domain = (u16)vcpu;
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op.u.getdomaininfo.ctxt = NULL;
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if ( (do_dom0_op(xc_handle, &op) < 0) ||
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((u16)op.u.getdomaininfo.domain != domid) )
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{
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PERROR("Could not get info on domain");
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return -1;
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}
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return op.u.getdomaininfo.cpu_time;
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}
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/* This is shared between save and restore, and may generally be useful. */
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unsigned long csum_page (void * page)
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{
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int i;
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unsigned long *p = page;
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unsigned long long sum=0;
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for ( i = 0; i < (PAGE_SIZE/sizeof(unsigned long)); i++ )
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sum += p[i];
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return sum ^ (sum>>32);
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}
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unsigned long xc_get_m2p_start_mfn ( int xc_handle )
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{
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unsigned long mfn;
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if ( ioctl( xc_handle, IOCTL_PRIVCMD_GET_MACH2PHYS_START_MFN, &mfn ) < 0 )
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{
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perror("xc_get_m2p_start_mfn:");
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return 0;
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}
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return mfn;
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}
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int xc_get_pfn_list(int xc_handle,
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u32 domid,
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unsigned long *pfn_buf,
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unsigned long max_pfns)
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{
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dom0_op_t op;
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int ret;
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op.cmd = DOM0_GETMEMLIST;
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op.u.getmemlist.domain = (domid_t)domid;
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op.u.getmemlist.max_pfns = max_pfns;
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op.u.getmemlist.buffer = pfn_buf;
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if ( mlock(pfn_buf, max_pfns * sizeof(unsigned long)) != 0 )
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{
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PERROR("Could not lock pfn list buffer");
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return -1;
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}
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ret = do_dom0_op(xc_handle, &op);
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(void)munlock(pfn_buf, max_pfns * sizeof(unsigned long));
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#if 0
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#ifdef DEBUG
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DPRINTF(("Ret for xc_get_pfn_list is %d\n", ret));
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if (ret >= 0) {
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int i, j;
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for (i = 0; i < op.u.getmemlist.num_pfns; i += 16) {
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fprintf(stderr, "0x%x: ", i);
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for (j = 0; j < 16; j++)
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fprintf(stderr, "0x%lx ", pfn_buf[i + j]);
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fprintf(stderr, "\n");
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}
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}
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#endif
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#endif
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return (ret < 0) ? -1 : op.u.getmemlist.num_pfns;
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}
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long xc_get_tot_pages(int xc_handle, u32 domid)
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{
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dom0_op_t op;
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op.cmd = DOM0_GETDOMAININFO;
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op.u.getdomaininfo.domain = (domid_t)domid;
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op.u.getdomaininfo.exec_domain = 0;
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op.u.getdomaininfo.ctxt = NULL;
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return (do_dom0_op(xc_handle, &op) < 0) ?
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-1 : op.u.getdomaininfo.tot_pages;
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}
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int xc_copy_to_domain_page(int xc_handle,
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u32 domid,
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unsigned long dst_pfn,
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void *src_page)
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{
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void *vaddr = xc_map_foreign_range(
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xc_handle, domid, PAGE_SIZE, PROT_WRITE, dst_pfn);
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if ( vaddr == NULL )
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return -1;
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memcpy(vaddr, src_page, PAGE_SIZE);
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munmap(vaddr, PAGE_SIZE);
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return 0;
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}
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unsigned long xc_get_filesz(int fd)
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{
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u16 sig;
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u32 _sz = 0;
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unsigned long sz;
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lseek(fd, 0, SEEK_SET);
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if ( read(fd, &sig, sizeof(sig)) != sizeof(sig) )
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return 0;
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sz = lseek(fd, 0, SEEK_END);
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if ( sig == 0x8b1f ) /* GZIP signature? */
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{
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lseek(fd, -4, SEEK_END);
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if ( read(fd, &_sz, 4) != 4 )
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return 0;
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sz = _sz;
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}
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lseek(fd, 0, SEEK_SET);
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return sz;
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}
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char *xc_read_kernel_image(const char *filename, unsigned long *size)
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{
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int kernel_fd = -1;
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gzFile kernel_gfd = NULL;
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char *image = NULL;
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unsigned int bytes;
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if ( (kernel_fd = open(filename, O_RDONLY)) < 0 )
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{
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PERROR("Could not open kernel image");
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goto out;
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}
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if ( (*size = xc_get_filesz(kernel_fd)) == 0 )
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{
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PERROR("Could not read kernel image");
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goto out;
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}
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if ( (kernel_gfd = gzdopen(kernel_fd, "rb")) == NULL )
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{
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PERROR("Could not allocate decompression state for state file");
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goto out;
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}
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if ( (image = malloc(*size)) == NULL )
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{
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PERROR("Could not allocate memory for kernel image");
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goto out;
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}
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if ( (bytes = gzread(kernel_gfd, image, *size)) != *size )
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{
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PERROR("Error reading kernel image, could not"
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" read the whole image (%d != %ld).", bytes, *size);
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free(image);
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image = NULL;
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}
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out:
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if ( kernel_gfd != NULL )
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gzclose(kernel_gfd);
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else if ( kernel_fd >= 0 )
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close(kernel_fd);
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return image;
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}
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void xc_map_memcpy(unsigned long dst, char *src, unsigned long size,
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int xch, u32 dom, unsigned long *parray,
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unsigned long vstart)
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{
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char *va;
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unsigned long chunksz, done, pa;
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for ( done = 0; done < size; done += chunksz )
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{
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pa = dst + done - vstart;
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va = xc_map_foreign_range(
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xch, dom, PAGE_SIZE, PROT_WRITE, parray[pa>>PAGE_SHIFT]);
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chunksz = size - done;
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if ( chunksz > (PAGE_SIZE - (pa & (PAGE_SIZE-1))) )
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chunksz = PAGE_SIZE - (pa & (PAGE_SIZE-1));
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memcpy(va + (pa & (PAGE_SIZE-1)), src + done, chunksz);
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munmap(va, PAGE_SIZE);
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}
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}
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