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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PULL 11/16] xen: Use newly added dmops for mapping VGA memory
From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Xen unstable (to be in 4.11) has two new dmops, relocate_memory and
pin_memory_cacheattr. Use these to set up the VGA memory, replacing the
previous calls to libxc. This allows the VGA console to work properly
when QEMU is running restricted (-xen-domid-restrict).
Wrapper functions are provided to allow QEMU to work with older versions
of Xen.
Tweak the error handling while making this change:
* Report pin_memory_cacheattr errors.
* Report errors even when DEBUG_HVM is not set. This is useful for
trying to understand why VGA is not working, since otherwise it just
fails silently.
* Fix the return values when an error occurs. The functions now
consistently return -1 and set errno.
CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Reviewed-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
configure | 19 +++++++++++++++++
hw/i386/xen/xen-hvm.c | 50 ++++++++++++++++++++++++---------------------
include/hw/xen/xen_common.h | 32 +++++++++++++++++++++++++++++
3 files changed, 78 insertions(+), 23 deletions(-)
diff --git a/configure b/configure
index 5cf9dde..aa35aef 100755
--- a/configure
+++ b/configure
@@ -2221,6 +2221,25 @@ EOF
# Xen unstable
elif
cat > $TMPC <<EOF &&
+#undef XC_WANT_COMPAT_DEVICEMODEL_API
+#define __XEN_TOOLS__
+#include <xendevicemodel.h>
+int main(void) {
+ xendevicemodel_handle *xd;
+
+ xd = xendevicemodel_open(0, 0);
+ xendevicemodel_pin_memory_cacheattr(xd, 0, 0, 0, 0);
+
+ return 0;
+}
+EOF
+ compile_prog "" "$xen_libs -lxendevicemodel $xen_stable_libs
-lxentoolcore"
+ then
+ xen_stable_libs="-lxendevicemodel $xen_stable_libs -lxentoolcore"
+ xen_ctrl_version=41100
+ xen=yes
+ elif
+ cat > $TMPC <<EOF &&
#undef XC_WANT_COMPAT_MAP_FOREIGN_API
#include <xenforeignmemory.h>
#include <xentoolcore.h>
diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index fb727bc..caa563b 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -347,7 +347,7 @@ static int xen_add_to_physmap(XenIOState *state,
MemoryRegion *mr,
hwaddr offset_within_region)
{
- unsigned long i = 0;
+ unsigned long nr_pages;
int rc = 0;
XenPhysmap *physmap = NULL;
hwaddr pfn, start_gpfn;
@@ -396,22 +396,26 @@ go_physmap:
pfn = phys_offset >> TARGET_PAGE_BITS;
start_gpfn = start_addr >> TARGET_PAGE_BITS;
- for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
- unsigned long idx = pfn + i;
- xen_pfn_t gpfn = start_gpfn + i;
-
- rc = xen_xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn,
idx, gpfn);
- if (rc) {
- DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
- PRI_xen_pfn" failed: %d (errno: %d)\n", idx, gpfn, rc,
errno);
- return -rc;
- }
+ nr_pages = size >> TARGET_PAGE_BITS;
+ rc = xendevicemodel_relocate_memory(xen_dmod, xen_domid, nr_pages, pfn,
+ start_gpfn);
+ if (rc) {
+ int saved_errno = errno;
+
+ error_report("relocate_memory %lu pages from GFN %"HWADDR_PRIx
+ " to GFN %"HWADDR_PRIx" failed: %s",
+ nr_pages, pfn, start_gpfn, strerror(saved_errno));
+ errno = saved_errno;
+ return -1;
}
- xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
+ rc = xendevicemodel_pin_memory_cacheattr(xen_dmod, xen_domid,
start_addr >> TARGET_PAGE_BITS,
(start_addr + size - 1) >> TARGET_PAGE_BITS,
XEN_DOMCTL_MEM_CACHEATTR_WB);
+ if (rc) {
+ error_report("pin_memory_cacheattr failed: %s", strerror(errno));
+ }
return xen_save_physmap(state, physmap);
}
@@ -419,7 +423,6 @@ static int xen_remove_from_physmap(XenIOState *state,
hwaddr start_addr,
ram_addr_t size)
{
- unsigned long i = 0;
int rc = 0;
XenPhysmap *physmap = NULL;
hwaddr phys_offset = 0;
@@ -438,16 +441,17 @@ static int xen_remove_from_physmap(XenIOState *state,
size >>= TARGET_PAGE_BITS;
start_addr >>= TARGET_PAGE_BITS;
phys_offset >>= TARGET_PAGE_BITS;
- for (i = 0; i < size; i++) {
- xen_pfn_t idx = start_addr + i;
- xen_pfn_t gpfn = phys_offset + i;
-
- rc = xen_xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn,
idx, gpfn);
- if (rc) {
- fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
- PRI_xen_pfn" failed: %d (errno: %d)\n", idx, gpfn, rc,
errno);
- return -rc;
- }
+ rc = xendevicemodel_relocate_memory(xen_dmod, xen_domid, size, start_addr,
+ phys_offset);
+ if (rc) {
+ int saved_errno = errno;
+
+ error_report("relocate_memory "RAM_ADDR_FMT" pages"
+ " from GFN %"HWADDR_PRIx
+ " to GFN %"HWADDR_PRIx" failed: %s",
+ size, start_addr, phys_offset, strerror(saved_errno));
+ errno = saved_errno;
+ return -1;
}
QLIST_REMOVE(physmap, list);
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index 4bd30a3..2eed6fc 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -89,6 +89,38 @@ typedef xc_interface xendevicemodel_handle;
#endif
+#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 41100
+
+static inline int xendevicemodel_relocate_memory(
+ xendevicemodel_handle *dmod, domid_t domid, uint32_t size, uint64_t
src_gfn,
+ uint64_t dst_gfn)
+{
+ uint32_t i;
+ int rc;
+
+ for (i = 0; i < size; i++) {
+ unsigned long idx = src_gfn + i;
+ xen_pfn_t gpfn = dst_gfn + i;
+
+ rc = xc_domain_add_to_physmap(xen_xc, domid, XENMAPSPACE_gmfn, idx,
+ gpfn);
+ if (rc) {
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+static inline int xendevicemodel_pin_memory_cacheattr(
+ xendevicemodel_handle *dmod, domid_t domid, uint64_t start, uint64_t end,
+ uint32_t type)
+{
+ return xc_domain_pin_memory_cacheattr(xen_xc, domid, start, end, type);
+}
+
+#endif /* CONFIG_XEN_CTRL_INTERFACE_VERSION < 41100 */
+
#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 41000
#define XEN_COMPAT_PHYSMAP
--
2.1.4
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