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Date: Wed, 16 Sep 2009 16:42:31 +0800
From: Sheng Yang <sheng@...ux.intel.com>
To: Keir Fraser <keir.fraser@...citrix.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: Jun Nakajima <jun.nakajima@...el.com>,
Eddie Dong <eddie.dong@...el.com>,
linux-kernel@...r.kernel.org,
xen-devel <xen-devel@...ts.xensource.com>,
Sheng Yang <sheng@...ux.intel.com>
Subject: [RFC][PATCH 10/10] xen/hybrid: Enable grant table and xenbus
Now vnif and vbd drivers can work.
Notice one memory region(0xfbfe0000ul - 0xfc000000ul) would be reserved in the
bios E820 table. This memory region would be used as grant table.
Signed-off-by: Sheng Yang <sheng@...ux.intel.com>
---
arch/x86/include/asm/xen/hypervisor.h | 3 +
arch/x86/xen/enlighten.c | 1 +
drivers/block/xen-blkfront.c | 3 +
drivers/input/xen-kbdfront.c | 4 ++
drivers/net/xen-netfront.c | 3 +
drivers/video/xen-fbfront.c | 4 ++
drivers/xen/grant-table.c | 67 ++++++++++++++++++++++++++++++++-
drivers/xen/xenbus/xenbus_probe.c | 23 ++++++++++-
8 files changed, 103 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/xen/hypervisor.h b/arch/x86/include/asm/xen/hypervisor.h
index 7eee836..267fa43 100644
--- a/arch/x86/include/asm/xen/hypervisor.h
+++ b/arch/x86/include/asm/xen/hypervisor.h
@@ -41,6 +41,7 @@ enum xen_domain_type {
XEN_NATIVE, /* running on bare hardware */
XEN_PV_DOMAIN, /* running in a PV domain */
XEN_HVM_DOMAIN, /* running in a Xen hvm domain */
+ XEN_HYBRID_DOMAIN,
};
#ifdef CONFIG_XEN
@@ -55,6 +56,8 @@ extern void xen_start_hybrid(void);
xen_domain_type == XEN_PV_DOMAIN)
#define xen_hvm_domain() (xen_domain() && \
xen_domain_type == XEN_HVM_DOMAIN)
+#define xen_hybrid_domain() (xen_domain() && \
+ xen_domain_type == XEN_HYBRID_DOMAIN)
#define XEN_HYBRID_ENABLED (1u << 0)
#define XEN_HYBRID_TIMER_ENABLED (1u << 1)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index f515584..6c4f0c1 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1129,6 +1129,7 @@ static int init_hybrid_info(void)
pv_info = xen_info;
pv_info.kernel_rpl = 0;
+ xen_domain_type = XEN_HYBRID_DOMAIN;
return 0;
}
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index a6cbf7b..14188ed 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1072,6 +1072,9 @@ static int __init xlblk_init(void)
if (!xen_domain())
return -ENODEV;
+ if (xen_hybrid_domain() && !xen_hybrid_evtchn_enabled())
+ return -ENODEV;
+
if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {
printk(KERN_WARNING "xen_blk: can't get major %d with name %s\n",
XENVBD_MAJOR, DEV_NAME);
diff --git a/drivers/input/xen-kbdfront.c b/drivers/input/xen-kbdfront.c
index 928d2ed..a82b6aa 100644
--- a/drivers/input/xen-kbdfront.c
+++ b/drivers/input/xen-kbdfront.c
@@ -338,6 +338,10 @@ static int __init xenkbd_init(void)
if (!xen_domain())
return -ENODEV;
+ /* Xen Hybrid domain don't need vkbd */
+ if (xen_hybrid_domain())
+ return -ENODEV;
+
/* Nothing to do if running in dom0. */
if (xen_initial_domain())
return -ENODEV;
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index f673253..3ad2c45 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1806,6 +1806,9 @@ static int __init netif_init(void)
if (!xen_domain())
return -ENODEV;
+ if (xen_hybrid_domain() && !xen_hybrid_evtchn_enabled())
+ return -ENODEV;
+
if (xen_initial_domain())
return 0;
diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c
index 2493f05..b423248 100644
--- a/drivers/video/xen-fbfront.c
+++ b/drivers/video/xen-fbfront.c
@@ -683,6 +683,10 @@ static int __init xenfb_init(void)
if (!xen_domain())
return -ENODEV;
+ /* Don't enable vfb in Xen hybrid domain */
+ if (xen_hybrid_domain())
+ return -ENODEV;
+
/* Nothing to do if running in dom0. */
if (xen_initial_domain())
return -ENODEV;
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 7d8f531..3e4ac4a 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -45,6 +45,9 @@
#include <asm/pgtable.h>
#include <asm/sync_bitops.h>
+#include <xen/interface/memory.h>
+#include <linux/io.h>
+#include <asm/e820.h>
/* External tools reserve first few grant table entries. */
#define NR_RESERVED_ENTRIES 8
@@ -440,12 +443,33 @@ static inline unsigned int max_nr_grant_frames(void)
return xen_max;
}
+static unsigned long hybrid_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_hybrid_domain() && xen_hybrid_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 = (hybrid_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)
@@ -472,11 +496,47 @@ static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
return 0;
}
+#define GNTTAB_START 0xfbfe0000ul
+#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_hybrid_domain() && xen_hybrid_evtchn_enabled()))
+ return gnttab_map(0, nr_grant_frames - 1);
+
+ if (!hybrid_resume_frames) {
+ /* Check if e820 reserved the related region */
+ if (!e820_all_mapped(GNTTAB_START,
+ GNTTAB_START + GNTTAB_SIZE, 2)) {
+ printk(KERN_WARNING
+ "Fail to found grant table region in e820!\n");
+ return -ENODEV;
+ }
+ if (PAGE_SIZE * max_nr_gframes > GNTTAB_SIZE) {
+ printk(KERN_WARNING
+ "Grant table size exceed the limit!\n");
+ return -EINVAL;
+ }
+
+ hybrid_resume_frames = GNTTAB_START;
+ shared = ioremap(hybrid_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)
@@ -512,6 +572,9 @@ static int __devinit gnttab_init(void)
if (!xen_domain())
return -ENODEV;
+ if (xen_hybrid_domain() && !xen_hybrid_evtchn_enabled())
+ return -ENODEV;
+
nr_grant_frames = 1;
boot_max_nr_grant_frames = __max_nr_grant_frames();
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 773d1cf..4b87605 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -53,6 +53,8 @@
#include <xen/events.h>
#include <xen/page.h>
+#include <xen/hvm.h>
+
#include "xenbus_comms.h"
#include "xenbus_probe.h"
@@ -828,6 +830,9 @@ static int __init xenbus_probe_init(void)
if (!xen_domain())
goto out_error;
+ if (xen_hybrid_domain() && !xen_hybrid_evtchn_enabled())
+ goto out_error;
+
/* Register ourselves with the kernel bus subsystem */
err = bus_register(&xenbus_frontend.bus);
if (err)
@@ -844,10 +849,19 @@ 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_hybrid_domain()) {
+ 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();
@@ -959,6 +973,9 @@ static void wait_for_devices(struct xenbus_driver *xendrv)
if (!ready_to_wait_for_devices || !xen_domain())
return;
+ if (xen_hybrid_domain() && !xen_hybrid_evtchn_enabled())
+ return;
+
while (exists_disconnected_device(drv)) {
if (time_after(jiffies, timeout))
break;
--
1.5.4.5
--
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