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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3 of 7] Use a reserved pfn in the guest address space to store mem event rings
tools/libxc/xc_domain_restore.c | 42 ++++++++++++++++++
tools/libxc/xc_domain_save.c | 36 ++++++++++++++++
tools/libxc/xc_hvm_build.c | 21 ++++++--
tools/libxc/xc_mem_access.c | 6 +-
tools/libxc/xc_mem_event.c | 3 +-
tools/libxc/xc_mem_paging.c | 6 +-
tools/libxc/xenctrl.h | 8 +--
tools/libxc/xg_save_restore.h | 4 +
tools/tests/xen-access/xen-access.c | 83 +++++++++++++++++-------------------
tools/xenpaging/xenpaging.c | 52 ++++++++++++++++------
xen/arch/x86/mm/mem_event.c | 50 ++++++++++------------
xen/include/public/domctl.h | 1 -
xen/include/public/hvm/params.h | 7 ++-
xen/include/xen/sched.h | 1 +
14 files changed, 214 insertions(+), 106 deletions(-)
This solves a long-standing issue in which the pages backing these rings were
pages belonging to dom0 user-space processes. Thus, if the process would die
unexpectedly, Xen would keep posting events to a page now belonging to some
other process.
We update all API-consumers in tree (xenpaging and xen-access).
This is an API/ABI change, so please speak up if it breaks your accumptions.
The patch touches tools, hypervisor x86/hvm bits, and hypervisor x86/mm bits.
Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/libxc/xc_domain_restore.c
--- a/tools/libxc/xc_domain_restore.c
+++ b/tools/libxc/xc_domain_restore.c
@@ -677,6 +677,9 @@ typedef struct {
int max_vcpu_id;
uint64_t vcpumap;
uint64_t identpt;
+ uint64_t paging_ring_pfn;
+ uint64_t access_ring_pfn;
+ uint64_t sharing_ring_pfn;
uint64_t vm86_tss;
uint64_t console_pfn;
uint64_t acpi_ioport_location;
@@ -750,6 +753,39 @@ static int pagebuf_get_one(xc_interface
// DPRINTF("EPT identity map address: %llx\n", buf->identpt);
return pagebuf_get_one(xch, ctx, buf, fd, dom);
+ case XC_SAVE_ID_HVM_PAGING_RING_PFN:
+ /* Skip padding 4 bytes then read the paging ring location. */
+ if ( RDEXACT(fd, &buf->paging_ring_pfn, sizeof(uint32_t)) ||
+ RDEXACT(fd, &buf->paging_ring_pfn, sizeof(uint64_t)) )
+ {
+ PERROR("error read the paging ring pfn");
+ return -1;
+ }
+ // DPRINTF("paging ring pfn address: %llx\n", buf->paging_ring_pfn);
+ return pagebuf_get_one(xch, ctx, buf, fd, dom);
+
+ case XC_SAVE_ID_HVM_ACCESS_RING_PFN:
+ /* Skip padding 4 bytes then read the mem access ring location. */
+ if ( RDEXACT(fd, &buf->access_ring_pfn, sizeof(uint32_t)) ||
+ RDEXACT(fd, &buf->access_ring_pfn, sizeof(uint64_t)) )
+ {
+ PERROR("error read the access ring pfn");
+ return -1;
+ }
+ // DPRINTF("access ring pfn address: %llx\n", buf->access_ring_pfn);
+ return pagebuf_get_one(xch, ctx, buf, fd, dom);
+
+ case XC_SAVE_ID_HVM_SHARING_RING_PFN:
+ /* Skip padding 4 bytes then read the sharing ring location. */
+ if ( RDEXACT(fd, &buf->sharing_ring_pfn, sizeof(uint32_t)) ||
+ RDEXACT(fd, &buf->sharing_ring_pfn, sizeof(uint64_t)) )
+ {
+ PERROR("error read the sharing ring pfn");
+ return -1;
+ }
+ // DPRINTF("sharing ring pfn address: %llx\n", buf->sharing_ring_pfn);
+ return pagebuf_get_one(xch, ctx, buf, fd, dom);
+
case XC_SAVE_ID_HVM_VM86_TSS:
/* Skip padding 4 bytes then read the vm86 TSS location. */
if ( RDEXACT(fd, &buf->vm86_tss, sizeof(uint32_t)) ||
@@ -1460,6 +1496,12 @@ int xc_domain_restore(xc_interface *xch,
/* should this be deferred? does it change? */
if ( pagebuf.identpt )
xc_set_hvm_param(xch, dom, HVM_PARAM_IDENT_PT,
pagebuf.identpt);
+ if ( pagebuf.paging_ring_pfn )
+ xc_set_hvm_param(xch, dom, HVM_PARAM_PAGING_RING_PFN,
pagebuf.paging_ring_pfn);
+ if ( pagebuf.access_ring_pfn )
+ xc_set_hvm_param(xch, dom, HVM_PARAM_ACCESS_RING_PFN,
pagebuf.access_ring_pfn);
+ if ( pagebuf.sharing_ring_pfn )
+ xc_set_hvm_param(xch, dom, HVM_PARAM_SHARING_RING_PFN,
pagebuf.sharing_ring_pfn);
if ( pagebuf.vm86_tss )
xc_set_hvm_param(xch, dom, HVM_PARAM_VM86_TSS,
pagebuf.vm86_tss);
if ( pagebuf.console_pfn )
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c
+++ b/tools/libxc/xc_domain_save.c
@@ -1639,6 +1639,42 @@ int xc_domain_save(xc_interface *xch, in
goto out;
}
+ chunk.id = XC_SAVE_ID_HVM_PAGING_RING_PFN;
+ chunk.data = 0;
+ xc_get_hvm_param(xch, dom, HVM_PARAM_PAGING_RING_PFN,
+ (unsigned long *)&chunk.data);
+
+ if ( (chunk.data != 0) &&
+ wrexact(io_fd, &chunk, sizeof(chunk)) )
+ {
+ PERROR("Error when writing the paging ring pfn for guest");
+ goto out;
+ }
+
+ chunk.id = XC_SAVE_ID_HVM_ACCESS_RING_PFN;
+ chunk.data = 0;
+ xc_get_hvm_param(xch, dom, HVM_PARAM_ACCESS_RING_PFN,
+ (unsigned long *)&chunk.data);
+
+ if ( (chunk.data != 0) &&
+ wrexact(io_fd, &chunk, sizeof(chunk)) )
+ {
+ PERROR("Error when writing the access ring pfn for guest");
+ goto out;
+ }
+
+ chunk.id = XC_SAVE_ID_HVM_SHARING_RING_PFN;
+ chunk.data = 0;
+ xc_get_hvm_param(xch, dom, HVM_PARAM_SHARING_RING_PFN,
+ (unsigned long *)&chunk.data);
+
+ if ( (chunk.data != 0) &&
+ wrexact(io_fd, &chunk, sizeof(chunk)) )
+ {
+ PERROR("Error when writing the sharing ring pfn for guest");
+ goto out;
+ }
+
chunk.id = XC_SAVE_ID_HVM_VM86_TSS;
chunk.data = 0;
xc_get_hvm_param(xch, dom, HVM_PARAM_VM86_TSS,
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/libxc/xc_hvm_build.c
--- a/tools/libxc/xc_hvm_build.c
+++ b/tools/libxc/xc_hvm_build.c
@@ -38,12 +38,15 @@
#define SUPERPAGE_1GB_SHIFT 18
#define SUPERPAGE_1GB_NR_PFNS (1UL << SUPERPAGE_1GB_SHIFT)
-#define SPECIALPAGE_BUFIOREQ 0
-#define SPECIALPAGE_XENSTORE 1
-#define SPECIALPAGE_IOREQ 2
-#define SPECIALPAGE_IDENT_PT 3
-#define SPECIALPAGE_CONSOLE 4
-#define NR_SPECIAL_PAGES 5
+#define SPECIALPAGE_PAGING 0
+#define SPECIALPAGE_ACCESS 1
+#define SPECIALPAGE_SHARING 2
+#define SPECIALPAGE_BUFIOREQ 3
+#define SPECIALPAGE_XENSTORE 4
+#define SPECIALPAGE_IOREQ 5
+#define SPECIALPAGE_IDENT_PT 6
+#define SPECIALPAGE_CONSOLE 7
+#define NR_SPECIAL_PAGES 8
#define special_pfn(x) (0xff000u - NR_SPECIAL_PAGES + (x))
static void build_hvm_info(void *hvm_info_page, uint64_t mem_size)
@@ -356,6 +359,12 @@ static int setup_guest(xc_interface *xch
special_pfn(SPECIALPAGE_IOREQ));
xc_set_hvm_param(xch, dom, HVM_PARAM_CONSOLE_PFN,
special_pfn(SPECIALPAGE_CONSOLE));
+ xc_set_hvm_param(xch, dom, HVM_PARAM_PAGING_RING_PFN,
+ special_pfn(SPECIALPAGE_PAGING));
+ xc_set_hvm_param(xch, dom, HVM_PARAM_ACCESS_RING_PFN,
+ special_pfn(SPECIALPAGE_ACCESS));
+ xc_set_hvm_param(xch, dom, HVM_PARAM_SHARING_RING_PFN,
+ special_pfn(SPECIALPAGE_SHARING));
/*
* Identity-map page table is required for running with CR0.PG=0 when
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/libxc/xc_mem_access.c
--- a/tools/libxc/xc_mem_access.c
+++ b/tools/libxc/xc_mem_access.c
@@ -25,7 +25,7 @@
int xc_mem_access_enable(xc_interface *xch, domid_t domain_id,
- uint32_t *port, void *ring_page)
+ uint32_t *port)
{
if ( !port )
{
@@ -36,7 +36,7 @@ int xc_mem_access_enable(xc_interface *x
return xc_mem_event_control(xch, domain_id,
XEN_DOMCTL_MEM_EVENT_OP_ACCESS_ENABLE,
XEN_DOMCTL_MEM_EVENT_OP_ACCESS,
- port, ring_page);
+ port);
}
int xc_mem_access_disable(xc_interface *xch, domid_t domain_id)
@@ -44,7 +44,7 @@ int xc_mem_access_disable(xc_interface *
return xc_mem_event_control(xch, domain_id,
XEN_DOMCTL_MEM_EVENT_OP_ACCESS_DISABLE,
XEN_DOMCTL_MEM_EVENT_OP_ACCESS,
- NULL, NULL);
+ NULL);
}
int xc_mem_access_resume(xc_interface *xch, domid_t domain_id, unsigned long
gfn)
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/libxc/xc_mem_event.c
--- a/tools/libxc/xc_mem_event.c
+++ b/tools/libxc/xc_mem_event.c
@@ -24,7 +24,7 @@
#include "xc_private.h"
int xc_mem_event_control(xc_interface *xch, domid_t domain_id, unsigned int op,
- unsigned int mode, uint32_t *port, void *ring_page)
+ unsigned int mode, uint32_t *port)
{
DECLARE_DOMCTL;
int rc;
@@ -33,7 +33,6 @@ int xc_mem_event_control(xc_interface *x
domctl.domain = domain_id;
domctl.u.mem_event_op.op = op;
domctl.u.mem_event_op.mode = mode;
- domctl.u.mem_event_op.ring_addr = (unsigned long) ring_page;
errno = 0;
rc = do_domctl(xch, &domctl);
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/libxc/xc_mem_paging.c
--- a/tools/libxc/xc_mem_paging.c
+++ b/tools/libxc/xc_mem_paging.c
@@ -25,7 +25,7 @@
int xc_mem_paging_enable(xc_interface *xch, domid_t domain_id,
- uint32_t *port, void *ring_page)
+ uint32_t *port)
{
if ( !port )
{
@@ -36,7 +36,7 @@ int xc_mem_paging_enable(xc_interface *x
return xc_mem_event_control(xch, domain_id,
XEN_DOMCTL_MEM_EVENT_OP_PAGING_ENABLE,
XEN_DOMCTL_MEM_EVENT_OP_PAGING,
- port, ring_page);
+ port);
}
int xc_mem_paging_disable(xc_interface *xch, domid_t domain_id)
@@ -44,7 +44,7 @@ int xc_mem_paging_disable(xc_interface *
return xc_mem_event_control(xch, domain_id,
XEN_DOMCTL_MEM_EVENT_OP_PAGING_DISABLE,
XEN_DOMCTL_MEM_EVENT_OP_PAGING,
- NULL, NULL);
+ NULL);
}
int xc_mem_paging_nominate(xc_interface *xch, domid_t domain_id, unsigned long
gfn)
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1888,13 +1888,12 @@ int xc_tmem_restore_extra(xc_interface *
* mem_event operations
*/
int xc_mem_event_control(xc_interface *xch, domid_t domain_id, unsigned int op,
- unsigned int mode, uint32_t *port, void *ring_page);
+ unsigned int mode, uint32_t *port);
int xc_mem_event_memop(xc_interface *xch, domid_t domain_id,
unsigned int op, unsigned int mode,
uint64_t gfn, void *buffer);
-int xc_mem_paging_enable(xc_interface *xch, domid_t domain_id,
- uint32_t *port, void *ring_page);
+int xc_mem_paging_enable(xc_interface *xch, domid_t domain_id, uint32_t *port);
int xc_mem_paging_disable(xc_interface *xch, domid_t domain_id);
int xc_mem_paging_nominate(xc_interface *xch, domid_t domain_id,
unsigned long gfn);
@@ -1905,8 +1904,7 @@ int xc_mem_paging_load(xc_interface *xch
int xc_mem_paging_resume(xc_interface *xch, domid_t domain_id,
unsigned long gfn);
-int xc_mem_access_enable(xc_interface *xch, domid_t domain_id,
- uint32_t *port, void *ring_page);
+int xc_mem_access_enable(xc_interface *xch, domid_t domain_id, uint32_t *port);
int xc_mem_access_disable(xc_interface *xch, domid_t domain_id);
int xc_mem_access_resume(xc_interface *xch, domid_t domain_id,
unsigned long gfn);
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/libxc/xg_save_restore.h
--- a/tools/libxc/xg_save_restore.h
+++ b/tools/libxc/xg_save_restore.h
@@ -254,6 +254,10 @@
#define XC_SAVE_ID_COMPRESSED_DATA -12 /* Marker to indicate arrival of
compressed data */
#define XC_SAVE_ID_ENABLE_COMPRESSION -13 /* Marker to enable compression
logic at receiver side */
#define XC_SAVE_ID_HVM_GENERATION_ID_ADDR -14
+/* Markers for the pfn's hosting these mem event rings */
+#define XC_SAVE_ID_HVM_PAGING_RING_PFN -15
+#define XC_SAVE_ID_HVM_ACCESS_RING_PFN -16
+#define XC_SAVE_ID_HVM_SHARING_RING_PFN -17
/*
** We process save/restore/migrate in batches of pages; the below
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/tests/xen-access/xen-access.c
--- a/tools/tests/xen-access/xen-access.c
+++ b/tools/tests/xen-access/xen-access.c
@@ -166,36 +166,13 @@ int xc_wait_for_event_or_timeout(xc_inte
err:
return -errno;
}
-
-static void *init_page(void)
-{
- void *buffer;
- int ret;
-
- /* Allocated page memory */
- ret = posix_memalign(&buffer, PAGE_SIZE, PAGE_SIZE);
- if ( ret != 0 )
- goto out_alloc;
-
- /* Lock buffer in memory so it can't be paged out */
- ret = mlock(buffer, PAGE_SIZE);
- if ( ret != 0 )
- goto out_lock;
-
- return buffer;
-
- munlock(buffer, PAGE_SIZE);
- out_lock:
- free(buffer);
- out_alloc:
- return NULL;
-}
xenaccess_t *xenaccess_init(xc_interface **xch_r, domid_t domain_id)
{
xenaccess_t *xenaccess;
xc_interface *xch;
int rc;
+ unsigned long ring_pfn, mmap_pfn;
xch = xc_interface_open(NULL, NULL, 0);
if ( !xch )
@@ -214,28 +191,42 @@ xenaccess_t *xenaccess_init(xc_interface
/* Set domain id */
xenaccess->mem_event.domain_id = domain_id;
- /* Initialise ring page */
- xenaccess->mem_event.ring_page = init_page();
- if ( xenaccess->mem_event.ring_page == NULL )
- {
- ERROR("Error initialising ring page");
- goto err;
- }
-
-
- /* Initialise ring */
- SHARED_RING_INIT((mem_event_sring_t *)xenaccess->mem_event.ring_page);
- BACK_RING_INIT(&xenaccess->mem_event.back_ring,
- (mem_event_sring_t *)xenaccess->mem_event.ring_page,
- PAGE_SIZE);
-
/* Initialise lock */
mem_event_ring_lock_init(&xenaccess->mem_event);
+ /* Map the ring page */
+ xc_get_hvm_param(xch, xenaccess->mem_event.domain_id,
+ HVM_PARAM_ACCESS_RING_PFN, &ring_pfn);
+ mmap_pfn = ring_pfn;
+ xenaccess->mem_event.ring_page =
+ xc_map_foreign_batch(xch, xenaccess->mem_event.domain_id,
+ PROT_READ | PROT_WRITE, &mmap_pfn, 1);
+ if ( mmap_pfn & XEN_DOMCTL_PFINFO_XTAB )
+ {
+ /* Map failed, populate ring page */
+ rc = xc_domain_populate_physmap_exact(xenaccess->xc_handle,
+ xenaccess->mem_event.domain_id,
+ 1, 0, 0, &ring_pfn);
+ if ( rc != 0 )
+ {
+ PERROR("Failed to populate ring gfn\n");
+ goto err;
+ }
+
+ mmap_pfn = ring_pfn;
+ xenaccess->mem_event.ring_page =
+ xc_map_foreign_batch(xch, xenaccess->mem_event.domain_id,
+ PROT_READ | PROT_WRITE, &mmap_pfn, 1);
+ if ( mmap_pfn & XEN_DOMCTL_PFINFO_XTAB )
+ {
+ PERROR("Could not map the ring page\n");
+ goto err;
+ }
+ }
+
/* Initialise Xen */
rc = xc_mem_access_enable(xenaccess->xc_handle,
xenaccess->mem_event.domain_id,
- &xenaccess->mem_event.evtchn_port,
- xenaccess->mem_event.ring_page);
+ &xenaccess->mem_event.evtchn_port);
if ( rc != 0 )
{
switch ( errno ) {
@@ -272,6 +263,12 @@ xenaccess_t *xenaccess_init(xc_interface
xenaccess->mem_event.port = rc;
+ /* Initialise ring */
+ SHARED_RING_INIT((mem_event_sring_t *)xenaccess->mem_event.ring_page);
+ BACK_RING_INIT(&xenaccess->mem_event.back_ring,
+ (mem_event_sring_t *)xenaccess->mem_event.ring_page,
+ PAGE_SIZE);
+
/* Get platform info */
xenaccess->platform_info = malloc(sizeof(xc_platform_info_t));
if ( xenaccess->platform_info == NULL )
@@ -316,8 +313,7 @@ xenaccess_t *xenaccess_init(xc_interface
{
if ( xenaccess->mem_event.ring_page )
{
- munlock(xenaccess->mem_event.ring_page, PAGE_SIZE);
- free(xenaccess->mem_event.ring_page);
+ munmap(xenaccess->mem_event.ring_page, PAGE_SIZE);
}
free(xenaccess->platform_info);
@@ -337,6 +333,7 @@ int xenaccess_teardown(xc_interface *xch
return 0;
/* Tear down domain xenaccess in Xen */
+ munmap(xenaccess->mem_event.ring_page, PAGE_SIZE);
rc = xc_mem_access_disable(xenaccess->xc_handle,
xenaccess->mem_event.domain_id);
if ( rc != 0 )
{
diff -r 99e6c9b9e971 -r 0e79f8005b6b tools/xenpaging/xenpaging.c
--- a/tools/xenpaging/xenpaging.c
+++ b/tools/xenpaging/xenpaging.c
@@ -285,6 +285,7 @@ static struct xenpaging *xenpaging_init(
xentoollog_logger *dbg = NULL;
char *p;
int rc;
+ unsigned long ring_pfn, mmap_pfn;
/* Allocate memory */
paging = calloc(1, sizeof(struct xenpaging));
@@ -341,24 +342,39 @@ static struct xenpaging *xenpaging_init(
goto err;
}
- /* Initialise ring page */
- paging->mem_event.ring_page = init_page();
- if ( paging->mem_event.ring_page == NULL )
+ /* Map the ring page */
+ xc_get_hvm_param(xch, paging->mem_event.domain_id,
+ HVM_PARAM_PAGING_RING_PFN, &ring_pfn);
+ mmap_pfn = ring_pfn;
+ paging->mem_event.ring_page =
+ xc_map_foreign_batch(xch, paging->mem_event.domain_id,
+ PROT_READ | PROT_WRITE, &mmap_pfn, 1);
+ if ( mmap_pfn & XEN_DOMCTL_PFINFO_XTAB )
{
- PERROR("Error initialising ring page");
- goto err;
+ /* Map failed, populate ring page */
+ rc = xc_domain_populate_physmap_exact(paging->xc_handle,
+ paging->mem_event.domain_id,
+ 1, 0, 0, &ring_pfn);
+ if ( rc != 0 )
+ {
+ PERROR("Failed to populate ring gfn\n");
+ goto err;
+ }
+
+ mmap_pfn = ring_pfn;
+ paging->mem_event.ring_page =
+ xc_map_foreign_batch(xch, paging->mem_event.domain_id,
+ PROT_READ | PROT_WRITE, &mmap_pfn, 1);
+ if ( mmap_pfn & XEN_DOMCTL_PFINFO_XTAB )
+ {
+ PERROR("Could not map the ring page\n");
+ goto err;
+ }
}
-
- /* Initialise ring */
- SHARED_RING_INIT((mem_event_sring_t *)paging->mem_event.ring_page);
- BACK_RING_INIT(&paging->mem_event.back_ring,
- (mem_event_sring_t *)paging->mem_event.ring_page,
- PAGE_SIZE);
/* Initialise Xen */
rc = xc_mem_paging_enable(xch, paging->mem_event.domain_id,
- &paging->mem_event.evtchn_port,
- paging->mem_event.ring_page);
+ &paging->mem_event.evtchn_port);
if ( rc != 0 )
{
switch ( errno ) {
@@ -398,6 +414,12 @@ static struct xenpaging *xenpaging_init(
paging->mem_event.port = rc;
+ /* Initialise ring */
+ SHARED_RING_INIT((mem_event_sring_t *)paging->mem_event.ring_page);
+ BACK_RING_INIT(&paging->mem_event.back_ring,
+ (mem_event_sring_t *)paging->mem_event.ring_page,
+ PAGE_SIZE);
+
/* Get max_pages from guest if not provided via cmdline */
if ( !paging->max_pages )
{
@@ -450,8 +472,7 @@ static struct xenpaging *xenpaging_init(
if ( paging->mem_event.ring_page )
{
- munlock(paging->mem_event.ring_page, PAGE_SIZE);
- free(paging->mem_event.ring_page);
+ munmap(paging->mem_event.ring_page, PAGE_SIZE);
}
free(dom_path);
@@ -477,6 +498,7 @@ static int xenpaging_teardown(struct xen
xch = paging->xc_handle;
paging->xc_handle = NULL;
/* Tear down domain paging in Xen */
+ munmap(paging->mem_event.ring_page, PAGE_SIZE);
rc = xc_mem_paging_disable(xch, paging->mem_event.domain_id);
if ( rc != 0 )
{
diff -r 99e6c9b9e971 -r 0e79f8005b6b xen/arch/x86/mm/mem_event.c
--- a/xen/arch/x86/mm/mem_event.c
+++ b/xen/arch/x86/mm/mem_event.c
@@ -44,16 +44,11 @@ static int mem_event_enable(
xen_domctl_mem_event_op_t *mec,
struct mem_event_domain *med,
int pause_flag,
+ int param,
xen_event_channel_notification_t notification_fn)
{
int rc;
- struct domain *dom_mem_event = current->domain;
- struct vcpu *v = current;
- unsigned long ring_addr = mec->ring_addr;
- l1_pgentry_t l1e;
- unsigned long ring_gfn = 0; /* gcc ... */
- p2m_type_t p2mt;
- mfn_t ring_mfn;
+ unsigned long ring_gfn = d->arch.hvm_domain.params[param];
/* Only one helper at a time. If the helper crashed,
* the ring is in an undefined state and so is the guest.
@@ -61,22 +56,18 @@ static int mem_event_enable(
if ( med->ring_page )
return -EBUSY;
- /* Get MFN of ring page */
- guest_get_eff_l1e(v, ring_addr, &l1e);
- ring_gfn = l1e_get_pfn(l1e);
- ring_mfn = get_gfn(dom_mem_event, ring_gfn, &p2mt);
-
- if ( unlikely(!mfn_valid(mfn_x(ring_mfn))) )
- {
- put_gfn(dom_mem_event, ring_gfn);
- return -EINVAL;
- }
+ /* The parameter defaults to zero, and it should be
+ * set to something */
+ if ( ring_gfn == 0 )
+ return -ENOSYS;
mem_event_ring_lock_init(med);
+ mem_event_ring_lock(med);
- /* Map ring page */
- med->ring_page = map_domain_page(mfn_x(ring_mfn));
- put_gfn(dom_mem_event, ring_gfn);
+ rc = prepare_ring_for_helper(d, ring_gfn, &med->ring_pg_struct,
+ &med->ring_page);
+ if ( rc < 0 )
+ goto err;
/* Set the number of currently blocked vCPUs to 0. */
med->blocked = 0;
@@ -101,11 +92,13 @@ static int mem_event_enable(
/* Initialize the last-chance wait queue. */
init_waitqueue_head(&med->wq);
+ mem_event_ring_unlock(med);
return 0;
err:
- unmap_domain_page(med->ring_page);
- med->ring_page = NULL;
+ destroy_ring_for_helper(&med->ring_page,
+ med->ring_pg_struct);
+ mem_event_ring_unlock(med);
return rc;
}
@@ -221,9 +214,6 @@ static int mem_event_disable(struct doma
/* Free domU's event channel and leave the other one unbound */
free_xen_event_channel(d->vcpu[0], med->xen_port);
-
- unmap_domain_page(med->ring_page);
- med->ring_page = NULL;
/* Unblock all vCPUs */
for_each_vcpu ( d, v )
@@ -235,6 +225,8 @@ static int mem_event_disable(struct doma
}
}
+ destroy_ring_for_helper(&med->ring_page,
+ med->ring_pg_struct);
mem_event_ring_unlock(med);
}
@@ -549,7 +541,9 @@ int mem_event_domctl(struct domain *d, x
if ( p2m->pod.entry_count )
break;
- rc = mem_event_enable(d, mec, med, _VPF_mem_paging,
mem_paging_notification);
+ rc = mem_event_enable(d, mec, med, _VPF_mem_paging,
+ HVM_PARAM_PAGING_RING_PFN,
+ mem_paging_notification);
}
break;
@@ -585,7 +579,9 @@ int mem_event_domctl(struct domain *d, x
if ( boot_cpu_data.x86_vendor != X86_VENDOR_INTEL )
break;
- rc = mem_event_enable(d, mec, med, _VPF_mem_access,
mem_access_notification);
+ rc = mem_event_enable(d, mec, med, _VPF_mem_access,
+ HVM_PARAM_ACCESS_RING_PFN,
+ mem_access_notification);
}
break;
diff -r 99e6c9b9e971 -r 0e79f8005b6b xen/include/public/domctl.h
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -747,7 +747,6 @@ struct xen_domctl_mem_event_op {
uint32_t mode; /* XEN_DOMCTL_MEM_EVENT_OP_* */
uint32_t port; /* OUT: event channel for ring */
- uint64_aligned_t ring_addr; /* IN: Virtual address of ring page */
};
typedef struct xen_domctl_mem_event_op xen_domctl_mem_event_op_t;
DEFINE_XEN_GUEST_HANDLE(xen_domctl_mem_event_op_t);
diff -r 99e6c9b9e971 -r 0e79f8005b6b xen/include/public/hvm/params.h
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -142,6 +142,11 @@
/* Boolean: Enable nestedhvm (hvm only) */
#define HVM_PARAM_NESTEDHVM 24
-#define HVM_NR_PARAMS 27
+/* Params for the mem event rings */
+#define HVM_PARAM_PAGING_RING_PFN 27
+#define HVM_PARAM_ACCESS_RING_PFN 28
+#define HVM_PARAM_SHARING_RING_PFN 29
+
+#define HVM_NR_PARAMS 30
#endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */
diff -r 99e6c9b9e971 -r 0e79f8005b6b xen/include/xen/sched.h
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -192,6 +192,7 @@ struct mem_event_domain
unsigned char target_producers;
/* shared ring page */
void *ring_page;
+ struct page_info *ring_pg_struct;
/* front-end ring */
mem_event_front_ring_t front_ring;
/* event channel port (vcpu0 only) */
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