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emellor@leeni.uk.xensource.com
a22292f2bb
Valgrind cannot see when a hypercall has initialised entries in a data structure, so appropriate memsets have been placed before using dom0_op_t, privcmd_hypercall_t, and a couple of miscellaneous blocks passed into this layer. This initialises the block so that valgrind considers it to be valid, but the data therein will be immediately overwritten by the hypercall, all being well. These changes are semantically neutral if -DVALGRIND is not set. Signed-off-by: Ewan Mellor <ewan@xensource.com>
143 lines
2.9 KiB
C
143 lines
2.9 KiB
C
/******************************************************************************
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* xc_misc.c
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*
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* Miscellaneous control interface functions.
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*/
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#include "xc_private.h"
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int xc_interface_open(void)
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{
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int fd = open("/proc/xen/privcmd", O_RDWR);
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if ( fd == -1 )
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PERROR("Could not obtain handle on privileged command interface");
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return fd;
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}
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int xc_interface_close(int xc_handle)
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{
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return close(xc_handle);
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}
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int xc_readconsolering(int xc_handle,
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char **pbuffer,
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unsigned int *pnr_chars,
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int clear)
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{
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int ret;
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DECLARE_DOM0_OP;
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char *buffer = *pbuffer;
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unsigned int nr_chars = *pnr_chars;
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op.cmd = DOM0_READCONSOLE;
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op.u.readconsole.buffer = buffer;
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op.u.readconsole.count = nr_chars;
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op.u.readconsole.clear = clear;
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if ( (ret = mlock(buffer, nr_chars)) != 0 )
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return ret;
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if ( (ret = do_dom0_op(xc_handle, &op)) == 0 )
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{
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*pbuffer = op.u.readconsole.buffer;
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*pnr_chars = op.u.readconsole.count;
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}
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safe_munlock(buffer, nr_chars);
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return ret;
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}
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int xc_physinfo(int xc_handle,
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xc_physinfo_t *put_info)
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{
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int ret;
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DECLARE_DOM0_OP;
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op.cmd = DOM0_PHYSINFO;
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op.interface_version = DOM0_INTERFACE_VERSION;
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if ( (ret = do_dom0_op(xc_handle, &op)) != 0 )
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return ret;
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memcpy(put_info, &op.u.physinfo, sizeof(*put_info));
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return 0;
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}
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int xc_sched_id(int xc_handle,
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int *sched_id)
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{
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int ret;
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DECLARE_DOM0_OP;
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op.cmd = DOM0_SCHED_ID;
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op.interface_version = DOM0_INTERFACE_VERSION;
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if ( (ret = do_dom0_op(xc_handle, &op)) != 0 )
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return ret;
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*sched_id = op.u.sched_id.sched_id;
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return 0;
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}
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int xc_perfc_control(int xc_handle,
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uint32_t opcode,
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xc_perfc_desc_t *desc)
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{
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int rc;
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DECLARE_DOM0_OP;
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op.cmd = DOM0_PERFCCONTROL;
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op.u.perfccontrol.op = opcode;
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op.u.perfccontrol.desc = desc;
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rc = do_dom0_op(xc_handle, &op);
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return (rc == 0) ? op.u.perfccontrol.nr_counters : rc;
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}
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long long xc_msr_read(int xc_handle, int cpu_mask, int msr)
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{
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int rc;
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DECLARE_DOM0_OP;
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op.cmd = DOM0_MSR;
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op.u.msr.write = 0;
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op.u.msr.msr = msr;
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op.u.msr.cpu_mask = cpu_mask;
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rc = do_dom0_op(xc_handle, &op);
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return (((unsigned long long)op.u.msr.out2)<<32) | op.u.msr.out1 ;
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}
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int xc_msr_write(int xc_handle, int cpu_mask, int msr, unsigned int low,
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unsigned int high)
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{
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int rc;
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DECLARE_DOM0_OP;
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op.cmd = DOM0_MSR;
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op.u.msr.write = 1;
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op.u.msr.msr = msr;
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op.u.msr.cpu_mask = cpu_mask;
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op.u.msr.in1 = low;
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op.u.msr.in2 = high;
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rc = do_dom0_op(xc_handle, &op);
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return rc;
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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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