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Staging: hv: fix smp problems in the hyperv core code
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This fixes a number of SMP problems that were in the hyperv core code.

Patch originally written by K. Y. Srinivasan <ksrinivasan@novell.com>
but forward ported to the latest in-kernel code and tweaked slightly by
me.

Novell, Inc. hereby disclaims all copyright in any derivative work
copyright associated with this patch.

Signed-off-by: K. Y. Srinivasan <ksrinivasan@novell.com>
Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>.
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Greg Kroah-Hartman committed Jan 20, 2010
1 parent d31a2ff commit 7692fd4
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Showing 3 changed files with 35 additions and 33 deletions.
50 changes: 25 additions & 25 deletions drivers/staging/hv/Hv.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -386,21 +386,22 @@ u16 HvSignalEvent(void)
* retrieve the initialized message and event pages. Otherwise, we create and
* initialize the message and event pages.
*/
int HvSynicInit(u32 irqVector)
void HvSynicInit(void *irqarg)
{
u64 version;
union hv_synic_simp simp;
union hv_synic_siefp siefp;
union hv_synic_sint sharedSint;
union hv_synic_scontrol sctrl;
u64 guestID;
int ret = 0;
u32 irqVector = *((u32 *)(irqarg));
int cpu = smp_processor_id();

DPRINT_ENTER(VMBUS);

if (!gHvContext.HypercallPage) {
DPRINT_EXIT(VMBUS);
return ret;
return;
}

/* Check the version */
Expand All @@ -425,27 +426,27 @@ int HvSynicInit(u32 irqVector)
*/
rdmsrl(HV_X64_MSR_GUEST_OS_ID, guestID);
if (guestID == HV_LINUX_GUEST_ID) {
gHvContext.synICMessagePage[0] =
gHvContext.synICMessagePage[cpu] =
phys_to_virt(simp.BaseSimpGpa << PAGE_SHIFT);
gHvContext.synICEventPage[0] =
gHvContext.synICEventPage[cpu] =
phys_to_virt(siefp.BaseSiefpGpa << PAGE_SHIFT);
} else {
DPRINT_ERR(VMBUS, "unknown guest id!!");
goto Cleanup;
}
DPRINT_DBG(VMBUS, "MAPPED: Simp: %p, Sifep: %p",
gHvContext.synICMessagePage[0],
gHvContext.synICEventPage[0]);
gHvContext.synICMessagePage[cpu],
gHvContext.synICEventPage[cpu]);
} else {
gHvContext.synICMessagePage[0] = osd_PageAlloc(1);
if (gHvContext.synICMessagePage[0] == NULL) {
gHvContext.synICMessagePage[cpu] = (void *)get_zeroed_page(GFP_ATOMIC);
if (gHvContext.synICMessagePage[cpu] == NULL) {
DPRINT_ERR(VMBUS,
"unable to allocate SYNIC message page!!");
goto Cleanup;
}

gHvContext.synICEventPage[0] = osd_PageAlloc(1);
if (gHvContext.synICEventPage[0] == NULL) {
gHvContext.synICEventPage[cpu] = (void *)get_zeroed_page(GFP_ATOMIC);
if (gHvContext.synICEventPage[cpu] == NULL) {
DPRINT_ERR(VMBUS,
"unable to allocate SYNIC event page!!");
goto Cleanup;
Expand All @@ -454,7 +455,7 @@ int HvSynicInit(u32 irqVector)
/* Setup the Synic's message page */
rdmsrl(HV_X64_MSR_SIMP, simp.AsUINT64);
simp.SimpEnabled = 1;
simp.BaseSimpGpa = virt_to_phys(gHvContext.synICMessagePage[0])
simp.BaseSimpGpa = virt_to_phys(gHvContext.synICMessagePage[cpu])
>> PAGE_SHIFT;

DPRINT_DBG(VMBUS, "HV_X64_MSR_SIMP msr set to: %llx",
Expand All @@ -465,7 +466,7 @@ int HvSynicInit(u32 irqVector)
/* Setup the Synic's event page */
rdmsrl(HV_X64_MSR_SIEFP, siefp.AsUINT64);
siefp.SiefpEnabled = 1;
siefp.BaseSiefpGpa = virt_to_phys(gHvContext.synICEventPage[0])
siefp.BaseSiefpGpa = virt_to_phys(gHvContext.synICEventPage[cpu])
>> PAGE_SHIFT;

DPRINT_DBG(VMBUS, "HV_X64_MSR_SIEFP msr set to: %llx",
Expand Down Expand Up @@ -501,32 +502,30 @@ int HvSynicInit(u32 irqVector)

DPRINT_EXIT(VMBUS);

return ret;
return;

Cleanup:
ret = -1;

if (gHvContext.GuestId == HV_LINUX_GUEST_ID) {
if (gHvContext.synICEventPage[0])
osd_PageFree(gHvContext.synICEventPage[0], 1);
if (gHvContext.synICEventPage[cpu])
osd_PageFree(gHvContext.synICEventPage[cpu], 1);

if (gHvContext.synICMessagePage[0])
osd_PageFree(gHvContext.synICMessagePage[0], 1);
if (gHvContext.synICMessagePage[cpu])
osd_PageFree(gHvContext.synICMessagePage[cpu], 1);
}

DPRINT_EXIT(VMBUS);

return ret;
return;
}

/**
* HvSynicCleanup - Cleanup routine for HvSynicInit().
*/
void HvSynicCleanup(void)
void HvSynicCleanup(void *arg)
{
union hv_synic_sint sharedSint;
union hv_synic_simp simp;
union hv_synic_siefp siefp;
int cpu = smp_processor_id();

DPRINT_ENTER(VMBUS);

Expand All @@ -539,6 +538,7 @@ void HvSynicCleanup(void)

sharedSint.Masked = 1;

/* Need to correctly cleanup in the case of SMP!!! */
/* Disable the interrupt */
wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, sharedSint.AsUINT64);

Expand All @@ -560,8 +560,8 @@ void HvSynicCleanup(void)

wrmsrl(HV_X64_MSR_SIEFP, siefp.AsUINT64);

osd_PageFree(gHvContext.synICMessagePage[0], 1);
osd_PageFree(gHvContext.synICEventPage[0], 1);
osd_PageFree(gHvContext.synICMessagePage[cpu], 1);
osd_PageFree(gHvContext.synICEventPage[cpu], 1);
}

DPRINT_EXIT(VMBUS);
Expand Down
6 changes: 3 additions & 3 deletions drivers/staging/hv/Hv.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,7 @@ static const struct hv_guid VMBUS_SERVICE_ID = {
},
};

#define MAX_NUM_CPUS 1
#define MAX_NUM_CPUS 32


struct hv_input_signal_event_buffer {
Expand Down Expand Up @@ -137,8 +137,8 @@ extern u16 HvPostMessage(union hv_connection_id connectionId,

extern u16 HvSignalEvent(void);

extern int HvSynicInit(u32 irqVector);
extern void HvSynicInit(void *irqarg);

extern void HvSynicCleanup(void);
extern void HvSynicCleanup(void *arg);

#endif /* __HV_H__ */
12 changes: 7 additions & 5 deletions drivers/staging/hv/Vmbus.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -129,7 +129,7 @@ static int VmbusOnDeviceAdd(struct hv_device *dev, void *AdditionalInfo)

/* strcpy(dev->name, "vmbus"); */
/* SynIC setup... */
ret = HvSynicInit(*irqvector);
on_each_cpu(HvSynicInit, (void *)irqvector, 1);

/* Connect to VMBus in the root partition */
ret = VmbusConnect();
Expand All @@ -150,7 +150,7 @@ static int VmbusOnDeviceRemove(struct hv_device *dev)
DPRINT_ENTER(VMBUS);
VmbusChannelReleaseUnattachedChannels();
VmbusDisconnect();
HvSynicCleanup();
on_each_cpu(HvSynicCleanup, NULL, 1);
DPRINT_EXIT(VMBUS);

return ret;
Expand All @@ -173,7 +173,8 @@ static void VmbusOnCleanup(struct hv_driver *drv)
*/
static void VmbusOnMsgDPC(struct hv_driver *drv)
{
void *page_addr = gHvContext.synICMessagePage[0];
int cpu = smp_processor_id();
void *page_addr = gHvContext.synICMessagePage[cpu];
struct hv_message *msg = (struct hv_message *)page_addr +
VMBUS_MESSAGE_SINT;
struct hv_message *copied;
Expand Down Expand Up @@ -230,11 +231,12 @@ static void VmbusOnEventDPC(struct hv_driver *drv)
static int VmbusOnISR(struct hv_driver *drv)
{
int ret = 0;
int cpu = smp_processor_id();
void *page_addr;
struct hv_message *msg;
union hv_synic_event_flags *event;

page_addr = gHvContext.synICMessagePage[0];
page_addr = gHvContext.synICMessagePage[cpu];
msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;

DPRINT_ENTER(VMBUS);
Expand All @@ -248,7 +250,7 @@ static int VmbusOnISR(struct hv_driver *drv)
}

/* TODO: Check if there are events to be process */
page_addr = gHvContext.synICEventPage[0];
page_addr = gHvContext.synICEventPage[cpu];
event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;

/* Since we are a child, we only need to check bit 0 */
Expand Down

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