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* src/xen_internal.c: try to autodetect the Xen hypervisor version
used and switch automatically. A bit nasty though. Daniel
This commit is contained in:
Daniel Veillard
parent
801bfd2ec9
commit
a2e2e4652f
@ -1,3 +1,8 @@
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Wed Jun 21 12:23:15 EDT 2006 Daniel Veillard <veillard@redhat.com>
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* src/xen_internal.c: try to autodetect the Xen hypervisor version
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used and switch automatically. A bit nasty though.
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Tue Jun 20 16:14:26 EDT 2006 Daniel Veillard <veillard@redhat.com>
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* src/xen_internal.c: fix breakage introduced in Xen changeset 10277
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@ -27,18 +27,21 @@
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#include <xen/xen.h>
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#include <xen/linux/privcmd.h>
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#if 0
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/* #ifndef __LINUX_PUBLIC_PRIVCMD_H__ */
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typedef struct hypercall_struct {
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__u64 op;
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__u64 arg[5];
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} hypercall_t;
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#define XEN_IOCTL_HYPERCALL_CMD _IOC(_IOC_NONE, 'P', 0, sizeof(hypercall_t))
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#else
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typedef struct old_hypercall_struct {
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unsigned long op;
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unsigned long arg[5];
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} old_hypercall_t;
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#define XEN_OLD_IOCTL_HYPERCALL_CMD \
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_IOC(_IOC_NONE, 'P', 0, sizeof(old_hypercall_t))
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typedef struct privcmd_hypercall hypercall_t;
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#define XEN_IOCTL_HYPERCALL_CMD IOCTL_PRIVCMD_HYPERCALL
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#endif
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static int xen_ioctl_hypercall_cmd = 0;
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static int old_hypervisor = 0;
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static int initialized = 0;
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static int hv_version = 0;
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#include "internal.h"
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#include "driver.h"
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@ -48,13 +51,14 @@ typedef struct privcmd_hypercall hypercall_t;
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static const char * xenHypervisorGetType(virConnectPtr conn);
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static unsigned long xenHypervisorGetMaxMemory(virDomainPtr domain);
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static int xenHypervisorInit(void);
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static virDriver xenHypervisorDriver = {
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"Xen",
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(DOM0_INTERFACE_VERSION >> 24) * 1000000 +
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((DOM0_INTERFACE_VERSION >> 16) & 0xFF) * 1000 +
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(DOM0_INTERFACE_VERSION & 0xFFFF),
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NULL, /* init */
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xenHypervisorInit, /* init */
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xenHypervisorOpen, /* open */
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xenHypervisorClose, /* close */
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xenHypervisorGetType, /* type */
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@ -84,16 +88,6 @@ static virDriver xenHypervisorDriver = {
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NULL /* domainRestore */
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};
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/**
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* xenHypervisorRegister:
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*
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* Registers the xenHypervisor driver
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*/
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void xenHypervisorRegister(void)
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{
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virRegisterDriver(&xenHypervisorDriver);
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}
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/**
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* virXenError:
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* @conn: the connection if available
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@ -115,6 +109,84 @@ virXenError(virErrorNumber error, const char *info, int value)
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errmsg, info, NULL, value, 0, errmsg, info, value);
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}
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/**
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* xenHypervisorInit:
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*
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* Initialize the hypervisor layer. Try to detect the kind of interface
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* used i.e. pre or post changeset 10277
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*/
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int xenHypervisorInit(void)
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{
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int fd, ret, cmd;
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hypercall_t hc;
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old_hypercall_t old_hc;
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if (initialized) {
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if (old_hypervisor == -1)
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return(-1);
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return(0);
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}
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initialized = 1;
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ret = open(XEN_HYPERVISOR_SOCKET, O_RDWR);
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if (ret < 0) {
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old_hypervisor = -1;
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return (-1);
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}
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fd = ret;
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hc.op = __HYPERVISOR_xen_version;
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hc.arg[0] = (unsigned long) XENVER_version;
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hc.arg[1] = 0;
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cmd = IOCTL_PRIVCMD_HYPERCALL;
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ret = ioctl(fd, cmd, (unsigned long) &hc);
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if ((ret != -1) && (ret != 0)) {
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fprintf(stderr, "Using new hypervisor call: %X\n", ret);
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hv_version = ret;
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xen_ioctl_hypercall_cmd = cmd;
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old_hypervisor = 0;
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goto done;
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}
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old_hc.op = __HYPERVISOR_xen_version;
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old_hc.arg[0] = (unsigned long) XENVER_version;
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old_hc.arg[1] = 0;
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cmd = _IOC(_IOC_NONE, 'P', 0, sizeof(old_hypercall_t));
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ret = ioctl(fd, cmd, (unsigned long) &old_hc);
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if ((ret != -1) && (ret != 0)) {
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fprintf(stderr, "Using old hypervisor call: %X\n", ret);
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hv_version = ret;
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xen_ioctl_hypercall_cmd = cmd;
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old_hypervisor = 1;
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goto done;
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}
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old_hypervisor = -1;
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virXenError(VIR_ERR_XEN_CALL, " ioctl ", IOCTL_PRIVCMD_HYPERCALL);
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close(fd);
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return(-1);
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done:
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close(fd);
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return(0);
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}
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/**
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* xenHypervisorRegister:
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*
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* Registers the xenHypervisor driver
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*/
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void xenHypervisorRegister(void)
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{
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if (initialized == 0)
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xenHypervisorInit();
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virRegisterDriver(&xenHypervisorDriver);
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}
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/**
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* xenHypervisorOpen:
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* @conn: pointer to the connection block
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@ -130,6 +202,9 @@ xenHypervisorOpen(virConnectPtr conn, const char *name, int flags)
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{
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int ret;
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if (initialized == 0)
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xenHypervisorInit();
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if ((name != NULL) && (strcasecmp(name, "xen")))
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return(-1);
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@ -168,6 +243,47 @@ xenHypervisorClose(virConnectPtr conn)
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return (0);
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}
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/**
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* xenHypervisorDoOldOp:
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* @handle: the handle to the Xen hypervisor
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* @op: pointer to the hyperviros operation structure
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*
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* Do an hypervisor operation though the old interface,
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* this leads to an hypervisor call through ioctl.
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*
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* Returns 0 in case of success and -1 in case of error.
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*/
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static int
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xenHypervisorDoOldOp(int handle, dom0_op_t * op)
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{
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int ret;
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old_hypercall_t hc;
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memset(&hc, 0, sizeof(hc));
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op->interface_version = hv_version << 8;
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hc.op = __HYPERVISOR_dom0_op;
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hc.arg[0] = (unsigned long) op;
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if (mlock(op, sizeof(dom0_op_t)) < 0) {
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virXenError(VIR_ERR_XEN_CALL, " locking", sizeof(dom0_op_t));
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return (-1);
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}
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ret = ioctl(handle, xen_ioctl_hypercall_cmd, (unsigned long) &hc);
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if (ret < 0) {
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virXenError(VIR_ERR_XEN_CALL, " ioctl ", xen_ioctl_hypercall_cmd);
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}
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if (munlock(op, sizeof(dom0_op_t)) < 0) {
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virXenError(VIR_ERR_XEN_CALL, " releasing", sizeof(dom0_op_t));
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ret = -1;
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}
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if (ret < 0)
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return (-1);
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return (0);
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}
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/**
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* xenHypervisorDoOp:
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* @handle: the handle to the Xen hypervisor
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@ -181,9 +297,12 @@ static int
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xenHypervisorDoOp(int handle, dom0_op_t * op)
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{
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int ret;
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unsigned int cmd;
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hypercall_t hc;
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if (old_hypervisor)
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return(xenHypervisorDoOldOp(handle, op));
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memset(&hc, 0, sizeof(hc));
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op->interface_version = DOM0_INTERFACE_VERSION;
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hc.op = __HYPERVISOR_dom0_op;
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hc.arg[0] = (unsigned long) op;
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@ -193,10 +312,9 @@ xenHypervisorDoOp(int handle, dom0_op_t * op)
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return (-1);
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}
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cmd = XEN_IOCTL_HYPERCALL_CMD;
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ret = ioctl(handle, cmd, (unsigned long) &hc);
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ret = ioctl(handle, xen_ioctl_hypercall_cmd, (unsigned long) &hc);
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if (ret < 0) {
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virXenError(VIR_ERR_XEN_CALL, " ioctl ", cmd);
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virXenError(VIR_ERR_XEN_CALL, " ioctl ", xen_ioctl_hypercall_cmd);
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}
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if (munlock(op, sizeof(dom0_op_t)) < 0) {
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@ -242,26 +360,9 @@ xenHypervisorGetType(virConnectPtr conn)
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int
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xenHypervisorGetVersion(virConnectPtr conn, unsigned long *hvVer)
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{
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int ret;
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unsigned int cmd;
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hypercall_t hc;
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if ((conn == NULL) || (conn->handle < 0) || (hvVer == NULL))
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return (-1);
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*hvVer = 0;
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hc.op = __HYPERVISOR_xen_version;
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hc.arg[0] = (unsigned long) XENVER_version;
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hc.arg[1] = 0;
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cmd = XEN_IOCTL_HYPERCALL_CMD;
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ret = ioctl(conn->handle, cmd, (unsigned long) &hc);
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if (ret < 0) {
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virXenError(VIR_ERR_XEN_CALL, " getting version ", XENVER_version);
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return (-1);
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}
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*hvVer = (ret >> 16) * 1000000 + (ret & 0xFFFF) * 1000;
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*hvVer = (hv_version >> 16) * 1000000 + (hv_version & 0xFFFF) * 1000;
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return(0);
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}
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