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Subject[PATCH 7/7] xen: Enable grant table and xenbus for PV extension of HVM
Date
Now pv drivers(vnif, vbd) can work.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
arch/x86/xen/enlighten.c | 1 +
drivers/input/xen-kbdfront.c | 3 ++
drivers/video/xen-fbfront.c | 3 ++
drivers/xen/grant-table.c | 59 +++++++++++++++++++++++++++++++++++--
drivers/xen/xenbus/xenbus_probe.c | 22 ++++++++++---
include/xen/xen.h | 2 +
include/xen/xenbus.h | 2 +-
7 files changed, 83 insertions(+), 9 deletions(-)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index f617639..3bc9ff0 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1277,6 +1277,7 @@ static int init_hvm_pv_info(void)
pv_info = xen_info;
pv_info.kernel_rpl = 0;

+ xen_domain_type = XEN_HVM_DOMAIN;
return 0;
}

diff --git a/drivers/input/xen-kbdfront.c b/drivers/input/xen-kbdfront.c
index febffc3..8e58812 100644
--- a/drivers/input/xen-kbdfront.c
+++ b/drivers/input/xen-kbdfront.c
@@ -342,6 +342,9 @@ static int __init xenkbd_init(void)
if (xen_initial_domain())
return -ENODEV;

+ if (xen_hvm_domain())
+ return -ENODEV;
+
return xenbus_register_frontend(&xenkbd_driver);
}

diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c
index daff72f..b173474 100644
--- a/drivers/video/xen-fbfront.c
+++ b/drivers/video/xen-fbfront.c
@@ -687,6 +687,9 @@ static int __init xenfb_init(void)
if (xen_initial_domain())
return -ENODEV;

+ if (xen_hvm_domain())
+ return -ENODEV;
+
return xenbus_register_frontend(&xenfb_driver);
}

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 4c6c0bd..abffda5 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -46,6 +46,8 @@
#include <asm/pgtable.h>
#include <asm/sync_bitops.h>

+#include <xen/interface/memory.h>
+#include <linux/io.h>

/* External tools reserve first few grant table entries. */
#define NR_RESERVED_ENTRIES 8
@@ -441,12 +443,33 @@ static inline unsigned int max_nr_grant_frames(void)
return xen_max;
}

+static unsigned long hvm_pv_resume_frames;
+
static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
{
struct gnttab_setup_table setup;
unsigned long *frames;
unsigned int nr_gframes = end_idx + 1;
int rc;
+ struct xen_add_to_physmap xatp;
+ unsigned int i = end_idx;
+
+ if (xen_hvm_pv_evtchn_enabled()) {
+ /*
+ * Loop backwards, so that the first hypercall has the largest
+ * index, ensuring that the table will grow only once.
+ */
+ do {
+ xatp.domid = DOMID_SELF;
+ xatp.idx = i;
+ xatp.space = XENMAPSPACE_grant_table;
+ xatp.gpfn = (hvm_pv_resume_frames >> PAGE_SHIFT) + i;
+ if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
+ BUG();
+ } while (i-- > start_idx);
+
+ return 0;
+ }

frames = kmalloc(nr_gframes * sizeof(unsigned long), GFP_ATOMIC);
if (!frames)
@@ -473,11 +496,41 @@ static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
return 0;
}

+/* The region reserved by QEmu for Xen platform device */
+#define GNTTAB_START 0xf2000000ul
+#define GNTTAB_SIZE 0x20000ul
+
int gnttab_resume(void)
{
- if (max_nr_grant_frames() < nr_grant_frames)
+ unsigned int max_nr_gframes;
+
+ max_nr_gframes = max_nr_grant_frames();
+ if (max_nr_gframes < nr_grant_frames)
return -ENOSYS;
- return gnttab_map(0, nr_grant_frames - 1);
+
+ if (xen_pv_domain())
+ return gnttab_map(0, nr_grant_frames - 1);
+
+ /* Xen PV featured HVM */
+ if (!hvm_pv_resume_frames) {
+ if (PAGE_SIZE * max_nr_gframes > GNTTAB_SIZE) {
+ printk(KERN_WARNING
+ "Grant table size exceed the limit!\n");
+ return -EINVAL;
+ }
+ hvm_pv_resume_frames = GNTTAB_START;
+ shared = ioremap(hvm_pv_resume_frames,
+ PAGE_SIZE * max_nr_gframes);
+ if (shared == NULL) {
+ printk(KERN_WARNING
+ "Fail to ioremap gnttab share frames\n");
+ return -ENOMEM;
+ }
+ }
+
+ gnttab_map(0, nr_grant_frames - 1);
+
+ return 0;
}

int gnttab_suspend(void)
@@ -510,7 +563,7 @@ static int __devinit gnttab_init(void)
unsigned int max_nr_glist_frames, nr_glist_frames;
unsigned int nr_init_grefs;

- if (!xen_domain())
+ if (!xen_evtchn_enabled())
return -ENODEV;

nr_grant_frames = 1;
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 2f7aaa9..2704f0c 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -55,6 +55,8 @@
#include <xen/events.h>
#include <xen/page.h>

+#include <xen/hvm.h>
+
#include "xenbus_comms.h"
#include "xenbus_probe.h"

@@ -786,7 +788,8 @@ static int __init xenbus_probe_init(void)
DPRINTK("");

err = -ENODEV;
- if (!xen_domain())
+
+ if (!xen_evtchn_enabled())
goto out_error;

/* Register ourselves with the kernel bus subsystem */
@@ -805,10 +808,19 @@ static int __init xenbus_probe_init(void)
/* dom0 not yet supported */
} else {
xenstored_ready = 1;
- xen_store_evtchn = xen_start_info->store_evtchn;
- xen_store_mfn = xen_start_info->store_mfn;
+ if (xen_hvm_pv_evtchn_enabled()) {
+ xen_store_evtchn =
+ hvm_get_parameter(HVM_PARAM_STORE_EVTCHN);
+ xen_store_mfn =
+ hvm_get_parameter(HVM_PARAM_STORE_PFN);
+ xen_store_interface =
+ ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
+ } else {
+ xen_store_evtchn = xen_start_info->store_evtchn;
+ xen_store_mfn = xen_start_info->store_mfn;
+ xen_store_interface = mfn_to_virt(xen_store_mfn);
+ }
}
- xen_store_interface = mfn_to_virt(xen_store_mfn);

/* Initialize the interface to xenstore. */
err = xs_init();
@@ -922,7 +934,7 @@ static void wait_for_devices(struct xenbus_driver *xendrv)
struct device_driver *drv = xendrv ? &xendrv->driver : NULL;
unsigned int seconds_waited = 0;

- if (!ready_to_wait_for_devices || !xen_domain())
+ if (!ready_to_wait_for_devices || !xen_evtchn_enabled())
return;

while (exists_connecting_device(drv)) {
diff --git a/include/xen/xen.h b/include/xen/xen.h
index 9bb92e5..f949aee 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -28,6 +28,8 @@ extern u32 xen_hvm_pv_status;
#define xen_hvm_pv_evtchn_enabled() (xen_hvm_pv_enabled() && \
(xen_hvm_pv_status & XEN_HVM_PV_EVTCHN_ENABLED))

+#define xen_evtchn_enabled() (xen_pv_domain() || xen_hvm_pv_evtchn_enabled())
+
#ifdef CONFIG_XEN_DOM0
#include <xen/interface/xen.h>
#include <asm/xen/hypervisor.h>
diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h
index 9f68cf5..0e79644 100644
--- a/include/xen/xenbus.h
+++ b/include/xen/xenbus.h
@@ -113,7 +113,7 @@ static inline int __must_check
xenbus_register_frontend(struct xenbus_driver *drv)
{
WARN_ON(drv->owner != THIS_MODULE);
- if (!xen_domain())
+ if (!xen_evtchn_enabled())
return -ENODEV;
return __xenbus_register_frontend(drv, THIS_MODULE, KBUILD_MODNAME);
}
--
1.5.4.5


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