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xen-hvm.c: Add support for Xen access to vmport 

This adds synchronisation of the 6 vcpu registers (only 32bits of
them) that vmport.c needs between Xen and QEMU.

This is to avoid a 2nd and 3rd exchange between QEMU and Xen to
fetch and put these 6 vcpu registers used by the code in vmport.c
and vmmouse.c

The registers are passed in the new shared page provided by
HVM_PARAM_VMPORT_REGS_PFN.

Add new array to XenIOState that allows selection of current_cpu by
vcpu id.

Now pass XenIOState to handle_ioreq().

Add new routines regs_to_cpu(), regs_from_cpu(), and
handle_vmport_ioreq().

Signed-off-by: Don Slutz <dslutz@verizon.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Don Slutz 2014-10-20 15:49:12 -04:00 committed by Stefano Stabellini
parent cbd5ac6991
commit 37f9e258b6
2 changed files with 118 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
include/hw/xen/xen_common.h
View File

@ -164,4 +164,19 @@ void destroy_hvm_domain(bool reboot);
/* shutdown/destroy current domain because of an error */
void xen_shutdown_fatal_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
#ifdef HVM_PARAM_VMPORT_REGS_PFN
static inline int xen_get_vmport_regs_pfn(XenXC xc, domid_t dom,
unsigned long *vmport_regs_pfn)
{
return xc_get_hvm_param(xc, dom, HVM_PARAM_VMPORT_REGS_PFN,
vmport_regs_pfn);
}
#else
static inline int xen_get_vmport_regs_pfn(XenXC xc, domid_t dom,
unsigned long *vmport_regs_pfn)
{
return -ENOSYS;
}
#endif
#endif /* QEMU_HW_XEN_COMMON_H */

108
xen-hvm.c
View File

@ -41,6 +41,29 @@ static MemoryRegion *framebuffer;
static bool xen_in_migration;
/* Compatibility with older version */
/* This allows QEMU to build on a system that has Xen 4.5 or earlier
* installed. This here (not in hw/xen/xen_common.h) because xen/hvm/ioreq.h
* needs to be included before this block and hw/xen/xen_common.h needs to
* be included before xen/hvm/ioreq.h
*/
#ifndef IOREQ_TYPE_VMWARE_PORT
#define IOREQ_TYPE_VMWARE_PORT 3
struct vmware_regs {
uint32_t esi;
uint32_t edi;
uint32_t ebx;
uint32_t ecx;
uint32_t edx;
};
typedef struct vmware_regs vmware_regs_t;
struct shared_vmport_iopage {
struct vmware_regs vcpu_vmport_regs[1];
};
typedef struct shared_vmport_iopage shared_vmport_iopage_t;
#endif
#if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
{
@ -79,8 +102,10 @@ typedef struct XenPhysmap {
typedef struct XenIOState {
shared_iopage_t *shared_page;
shared_vmport_iopage_t *shared_vmport_page;
buffered_iopage_t *buffered_io_page;
QEMUTimer *buffered_io_timer;
CPUState **cpu_by_vcpu_id;
/* the evtchn port for polling the notification, */
evtchn_port_t *ioreq_local_port;
/* evtchn local port for buffered io */
@ -773,7 +798,50 @@ static void cpu_ioreq_move(ioreq_t *req)
}
}
static void handle_ioreq(ioreq_t *req)
static void regs_to_cpu(vmware_regs_t *vmport_regs, ioreq_t *req)
{
X86CPU *cpu;
CPUX86State *env;
cpu = X86_CPU(current_cpu);
env = &cpu->env;
env->regs[R_EAX] = req->data;
env->regs[R_EBX] = vmport_regs->ebx;
env->regs[R_ECX] = vmport_regs->ecx;
env->regs[R_EDX] = vmport_regs->edx;
env->regs[R_ESI] = vmport_regs->esi;
env->regs[R_EDI] = vmport_regs->edi;
}
static void regs_from_cpu(vmware_regs_t *vmport_regs)
{
X86CPU *cpu = X86_CPU(current_cpu);
CPUX86State *env = &cpu->env;
vmport_regs->ebx = env->regs[R_EBX];
vmport_regs->ecx = env->regs[R_ECX];
vmport_regs->edx = env->regs[R_EDX];
vmport_regs->esi = env->regs[R_ESI];
vmport_regs->edi = env->regs[R_EDI];
}
static void handle_vmport_ioreq(XenIOState *state, ioreq_t *req)
{
vmware_regs_t *vmport_regs;
assert(state->shared_vmport_page);
vmport_regs =
&state->shared_vmport_page->vcpu_vmport_regs[state->send_vcpu];
QEMU_BUILD_BUG_ON(sizeof(*req) < sizeof(*vmport_regs));
current_cpu = state->cpu_by_vcpu_id[state->send_vcpu];
regs_to_cpu(vmport_regs, req);
cpu_ioreq_pio(req);
regs_from_cpu(vmport_regs);
current_cpu = NULL;
}
static void handle_ioreq(XenIOState *state, ioreq_t *req)
{
if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
(req->size < sizeof (target_ulong))) {
@ -787,6 +855,9 @@ static void handle_ioreq(ioreq_t *req)
case IOREQ_TYPE_COPY:
cpu_ioreq_move(req);
break;
case IOREQ_TYPE_VMWARE_PORT:
handle_vmport_ioreq(state, req);
break;
case IOREQ_TYPE_TIMEOFFSET:
break;
case IOREQ_TYPE_INVALIDATE:
@ -828,7 +899,7 @@ static int handle_buffered_iopage(XenIOState *state)
req.data |= ((uint64_t)buf_req->data) << 32;
}
handle_ioreq(&req);
handle_ioreq(state, &req);
xen_mb();
state->buffered_io_page->read_pointer += qw ? 2 : 1;
@ -857,14 +928,16 @@ static void cpu_handle_ioreq(void *opaque)
handle_buffered_iopage(state);
if (req) {
handle_ioreq(req);
handle_ioreq(state, req);
if (req->state != STATE_IOREQ_INPROCESS) {
fprintf(stderr, "Badness in I/O request ... not in service?!: "
"%x, ptr: %x, port: %"PRIx64", "
"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
"data: %"PRIx64", count: %" FMT_ioreq_size
", size: %" FMT_ioreq_size
", type: %"FMT_ioreq_size"\n",
req->state, req->data_is_ptr, req->addr,
req->data, req->count, req->size);
req->data, req->count, req->size, req->type);
destroy_hvm_domain(false);
return;
}
@ -904,6 +977,14 @@ static void xen_main_loop_prepare(XenIOState *state)
state);
if (evtchn_fd != -1) {
CPUState *cpu_state;
DPRINTF("%s: Init cpu_by_vcpu_id\n", __func__);
CPU_FOREACH(cpu_state) {
DPRINTF("%s: cpu_by_vcpu_id[%d]=%p\n",
__func__, cpu_state->cpu_index, cpu_state);
state->cpu_by_vcpu_id[cpu_state->cpu_index] = cpu_state;
}
qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
}
}
@ -1020,6 +1101,20 @@ int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size,
errno, xen_xc);
}
rc = xen_get_vmport_regs_pfn(xen_xc, xen_domid, &ioreq_pfn);
if (!rc) {
DPRINTF("shared vmport page at pfn %lx\n", ioreq_pfn);
state->shared_vmport_page =
xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
PROT_READ|PROT_WRITE, ioreq_pfn);
if (state->shared_vmport_page == NULL) {
hw_error("map shared vmport IO page returned error %d handle="
XC_INTERFACE_FMT, errno, xen_xc);
}
} else if (rc != -ENOSYS) {
hw_error("get vmport regs pfn returned error %d, rc=%d", errno, rc);
}
xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn);
DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
@ -1028,6 +1123,9 @@ int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size,
hw_error("map buffered IO page returned error %d", errno);
}
/* Note: cpus is empty at this point in init */
state->cpu_by_vcpu_id = g_malloc0(max_cpus * sizeof(CPUState *));
state->ioreq_local_port = g_malloc0(max_cpus * sizeof (evtchn_port_t));
/* FIXME: how about if we overflow the page here? */