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[Qemu-devel] [PATCH v4 34/47] Postcopy: Create a fault handler thread be
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[Qemu-devel] [PATCH v4 34/47] Postcopy: Create a fault handler thread before marking the ram as userfault |
Date: |
Fri, 3 Oct 2014 18:47:40 +0100 |
From: "Dr. David Alan Gilbert" <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
---
include/migration/migration.h | 3 +++
postcopy-ram.c | 23 +++++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/include/migration/migration.h b/include/migration/migration.h
index f401775..cdd0e56 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -87,6 +87,9 @@ struct MigrationIncomingState {
POSTCOPY_RAM_INCOMING_END
} postcopy_ram_state;
+ QemuThread fault_thread;
+ QemuSemaphore fault_thread_sem;
+
/* For the kernel to send us notifications */
int userfault_fd;
QEMUFile *return_path;
diff --git a/postcopy-ram.c b/postcopy-ram.c
index 925ac77..8b2a035 100644
--- a/postcopy-ram.c
+++ b/postcopy-ram.c
@@ -518,8 +518,31 @@ static int postcopy_ram_sensitise_area(const char
*block_name, void *host_addr,
return 0;
}
+/*
+ * Handle faults detected by the USERFAULT markings
+ */
+static void *postcopy_ram_fault_thread(void *opaque)
+{
+ MigrationIncomingState *mis = (MigrationIncomingState *)opaque;
+
+ fprintf(stderr, "postcopy_ram_fault_thread\n");
+ /* TODO: In later patch */
+ qemu_sem_post(&mis->fault_thread_sem);
+ while (1) {
+ /* TODO: In later patch */
+ }
+
+ return NULL;
+}
+
int postcopy_ram_enable_notify(MigrationIncomingState *mis)
{
+ /* Create the fault handler thread and wait for it to be ready */
+ qemu_sem_init(&mis->fault_thread_sem, 0);
+ qemu_thread_create(&mis->fault_thread, "postcopy/fault",
+ postcopy_ram_fault_thread, mis, QEMU_THREAD_JOINABLE);
+ qemu_sem_wait(&mis->fault_thread_sem);
+
/* Mark so that we get notified of accesses to unwritten areas */
if (qemu_ram_foreach_block(postcopy_ram_sensitise_area, mis)) {
return -1;
--
1.9.3