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xen: Use newly added dmops for mapping VGA memory

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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@eu.citrix.com>
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Ross Lagerwall 2017-10-23 10:27:27 +01:00 committed by Ian Jackson
parent 2c42f1e801
commit 2cbf890353
3 changed files with 76 additions and 21 deletions
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19
configure vendored
View File

@ -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>

46
hw/i386/xen/xen-hvm.c
View File

@ -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);
nr_pages = size >> TARGET_PAGE_BITS;
rc = xendevicemodel_relocate_memory(xen_dmod, xen_domid, nr_pages, pfn,
start_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;
}
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);
rc = xendevicemodel_relocate_memory(xen_dmod, xen_domid, size, start_addr,
phys_offset);
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;
}
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);

32
include/hw/xen/xen_common.h
View File

@ -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