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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v10 2/3] Differentiate IO/mem resources tracked by ioreq server
Currently in ioreq server, guest write-protected ram pages are
tracked in the same rangeset with device mmio resources. Yet
unlike device mmio, which can be in big chunks, the guest write-
protected pages may be discrete ranges with 4K bytes each. This
patch uses a seperate rangeset for the guest ram pages.
To differentiate the ioreq type between the write-protected memory
ranges and the mmio ranges when selecting an ioreq server, the p2m
type is retrieved by calling get_page_from_gfn(). And we do not
need to worry about the p2m type change during the ioreq selection
process.
Note: Previously, a new hypercall or subop was suggested to map
write-protected pages into ioreq server. However, it turned out
handler of this new hypercall would be almost the same with the
existing pair - HVMOP_[un]map_io_range_to_ioreq_server, and there's
already a type parameter in this hypercall. So no new hypercall
defined, only a new type is introduced.
Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Shuai Ruan <shuai.ruan@xxxxxxxxxxxxxxx>
Signed-off-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>
---
tools/libxc/include/xenctrl.h | 31 ++++++++++++++++++++
tools/libxc/xc_domain.c | 61 ++++++++++++++++++++++++++++++++++++++++
xen/arch/x86/hvm/hvm.c | 27 +++++++++++++++---
xen/include/asm-x86/hvm/domain.h | 2 +-
xen/include/public/hvm/hvm_op.h | 1 +
5 files changed, 117 insertions(+), 5 deletions(-)
diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 079cad0..036c72d 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -2023,6 +2023,37 @@ int xc_hvm_unmap_io_range_from_ioreq_server(xc_interface
*xch,
int is_mmio,
uint64_t start,
uint64_t end);
+/**
+ * This function registers a range of write-protected memory for emulation.
+ *
+ * @parm xch a handle to an open hypervisor interface.
+ * @parm domid the domain id to be serviced
+ * @parm id the IOREQ Server id.
+ * @parm start start of range
+ * @parm end end of range (inclusive).
+ * @return 0 on success, -1 on failure.
+ */
+int xc_hvm_map_wp_mem_range_to_ioreq_server(xc_interface *xch,
+ domid_t domid,
+ ioservid_t id,
+ xen_pfn_t start,
+ xen_pfn_t end);
+
+/**
+ * This function deregisters a range of write-protected memory for emulation.
+ *
+ * @parm xch a handle to an open hypervisor interface.
+ * @parm domid the domain id to be serviced
+ * @parm id the IOREQ Server id.
+ * @parm start start of range
+ * @parm end end of range (inclusive).
+ * @return 0 on success, -1 on failure.
+ */
+int xc_hvm_unmap_wp_mem_range_from_ioreq_server(xc_interface *xch,
+ domid_t domid,
+ ioservid_t id,
+ xen_pfn_t start,
+ xen_pfn_t end);
/**
* This function registers a PCI device for config space emulation.
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 99e0d48..4f43695 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -1544,6 +1544,67 @@ int xc_hvm_unmap_io_range_from_ioreq_server(xc_interface
*xch, domid_t domid,
return rc;
}
+int xc_hvm_map_wp_mem_range_to_ioreq_server(xc_interface *xch,
+ domid_t domid,
+ ioservid_t id,
+ xen_pfn_t start,
+ xen_pfn_t end)
+{
+ DECLARE_HYPERCALL;
+ DECLARE_HYPERCALL_BUFFER(xen_hvm_io_range_t, arg);
+ int rc;
+
+ arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
+ if ( arg == NULL )
+ return -1;
+
+ hypercall.op = __HYPERVISOR_hvm_op;
+ hypercall.arg[0] = HVMOP_map_io_range_to_ioreq_server;
+ hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+ arg->domid = domid;
+ arg->id = id;
+ arg->type = HVMOP_IO_RANGE_WP_MEM;
+ arg->start = start;
+ arg->end = end;
+
+ rc = do_xen_hypercall(xch, &hypercall);
+
+ xc_hypercall_buffer_free(xch, arg);
+ return rc;
+}
+
+int xc_hvm_unmap_wp_mem_range_from_ioreq_server(xc_interface *xch,
+ domid_t domid,
+ ioservid_t id,
+ xen_pfn_t start,
+ xen_pfn_t end)
+{
+ DECLARE_HYPERCALL;
+ DECLARE_HYPERCALL_BUFFER(xen_hvm_io_range_t, arg);
+ int rc;
+
+ arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
+ if ( arg == NULL )
+ return -1;
+
+ hypercall.op = __HYPERVISOR_hvm_op;
+ hypercall.arg[0] = HVMOP_unmap_io_range_from_ioreq_server;
+ hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+ arg->domid = domid;
+ arg->id = id;
+ arg->type = HVMOP_IO_RANGE_WP_MEM;
+ arg->start = start;
+ arg->end = end;
+
+ rc = do_xen_hypercall(xch, &hypercall);
+
+ xc_hypercall_buffer_free(xch, arg);
+ return rc;
+
+}
+
int xc_hvm_map_pcidev_to_ioreq_server(xc_interface *xch, domid_t domid,
ioservid_t id, uint16_t segment,
uint8_t bus, uint8_t device,
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index f646c1e..d59e7bc 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -935,6 +935,9 @@ static void hvm_ioreq_server_free_rangesets(struct
hvm_ioreq_server *s,
rangeset_destroy(s->range[i]);
}
+const char *io_range_name[NR_IO_RANGE_TYPES] =
+ {"port", "mmio", "pci", "wp-mem"};
+
static int hvm_ioreq_server_alloc_rangesets(struct hvm_ioreq_server *s,
bool_t is_default)
{
@@ -949,10 +952,7 @@ static int hvm_ioreq_server_alloc_rangesets(struct
hvm_ioreq_server *s,
char *name;
rc = asprintf(&name, "ioreq_server %d %s", s->id,
- (i == HVMOP_IO_RANGE_PORT) ? "port" :
- (i == HVMOP_IO_RANGE_MEMORY) ? "memory" :
- (i == HVMOP_IO_RANGE_PCI) ? "pci" :
- "");
+ (i < NR_IO_RANGE_TYPES) ? io_range_name[i] : "");
if ( rc )
goto fail;
@@ -1270,6 +1270,7 @@ static int hvm_map_io_range_to_ioreq_server(struct domain
*d, ioservid_t id,
case HVMOP_IO_RANGE_PORT:
case HVMOP_IO_RANGE_MEMORY:
case HVMOP_IO_RANGE_PCI:
+ case HVMOP_IO_RANGE_WP_MEM:
r = s->range[type];
break;
@@ -1321,6 +1322,7 @@ static int hvm_unmap_io_range_from_ioreq_server(struct
domain *d, ioservid_t id,
case HVMOP_IO_RANGE_PORT:
case HVMOP_IO_RANGE_MEMORY:
case HVMOP_IO_RANGE_PCI:
+ case HVMOP_IO_RANGE_WP_MEM:
r = s->range[type];
break;
@@ -2561,6 +2563,8 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct
domain *d,
uint32_t cf8;
uint8_t type;
uint64_t addr;
+ p2m_type_t p2mt;
+ struct page_info *ram_page;
if ( list_empty(&d->arch.hvm_domain.ioreq_server.list) )
return NULL;
@@ -2604,6 +2608,16 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct
domain *d,
type = (p->type == IOREQ_TYPE_PIO) ?
HVMOP_IO_RANGE_PORT : HVMOP_IO_RANGE_MEMORY;
addr = p->addr;
+ if ( type == HVMOP_IO_RANGE_MEMORY )
+ {
+ ram_page = get_page_from_gfn(d, p->addr >> PAGE_SHIFT,
+ &p2mt, P2M_UNSHARE);
+ if ( p2mt == p2m_mmio_write_dm )
+ type = HVMOP_IO_RANGE_WP_MEM;
+
+ if ( ram_page )
+ put_page(ram_page);
+ }
}
list_for_each_entry ( s,
@@ -2645,6 +2659,11 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct
domain *d,
}
break;
+ case HVMOP_IO_RANGE_WP_MEM:
+ if ( rangeset_contains_singleton(r, PFN_DOWN(addr)) )
+ return s;
+
+ break;
}
}
diff --git a/xen/include/asm-x86/hvm/domain.h b/xen/include/asm-x86/hvm/domain.h
index a8cc2ad..1e13973 100644
--- a/xen/include/asm-x86/hvm/domain.h
+++ b/xen/include/asm-x86/hvm/domain.h
@@ -48,7 +48,7 @@ struct hvm_ioreq_vcpu {
bool_t pending;
};
-#define NR_IO_RANGE_TYPES (HVMOP_IO_RANGE_PCI + 1)
+#define NR_IO_RANGE_TYPES (HVMOP_IO_RANGE_WP_MEM + 1)
#define MAX_NR_IO_RANGES 256
struct hvm_ioreq_server {
diff --git a/xen/include/public/hvm/hvm_op.h b/xen/include/public/hvm/hvm_op.h
index 1606185..c0b1e30 100644
--- a/xen/include/public/hvm/hvm_op.h
+++ b/xen/include/public/hvm/hvm_op.h
@@ -333,6 +333,7 @@ struct xen_hvm_io_range {
# define HVMOP_IO_RANGE_PORT 0 /* I/O port range */
# define HVMOP_IO_RANGE_MEMORY 1 /* MMIO range */
# define HVMOP_IO_RANGE_PCI 2 /* PCI segment/bus/dev/func range */
+# define HVMOP_IO_RANGE_WP_MEM 3 /* Write-protected ram range */
uint64_aligned_t start, end; /* IN - inclusive start and end of range */
};
typedef struct xen_hvm_io_range xen_hvm_io_range_t;
--
1.9.1
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