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[Qemu-devel] [RFC v2 19/32] vhost+postcopy: Resolve client address
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[Qemu-devel] [RFC v2 19/32] vhost+postcopy: Resolve client address |
Date: |
Thu, 24 Aug 2017 20:27:17 +0100 |
From: "Dr. David Alan Gilbert" <address@hidden>
Resolve fault addresses read off the clients UFD into RAMBlock
and offset, and call back to the postcopy code to ask for the page.
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
---
hw/virtio/trace-events | 3 +++
hw/virtio/vhost-user.c | 30 +++++++++++++++++++++++++++++-
2 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 5067dee19b..f7d4b831fe 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -1,6 +1,9 @@
# See docs/devel/tracing.txt for syntax documentation.
# hw/virtio/vhost-user.c
+vhost_user_postcopy_fault_handler(const char *name, uint64_t fault_address,
int nregions) "%s: @0x%"PRIx64" nregions:%d"
+vhost_user_postcopy_fault_handler_loop(int i, uint64_t client_base, uint64_t
size) "%d: client 0x%"PRIx64" +0x%"PRIx64
+vhost_user_postcopy_fault_handler_found(int i, uint64_t region_offset,
uint64_t rb_offset) "%d: region_offset: 0x%"PRIx64" rb_offset:0x%"PRIx64
vhost_user_postcopy_listen(void) ""
vhost_user_set_mem_table_postcopy(uint64_t client_addr, uint64_t qhva, int
reply_i, int region_i) "client:0x%"PRIx64" for hva: 0x%"PRIx64" reply %d region
%d"
vhost_user_set_mem_table_withfd(int index, const char *name, uint64_t
memory_size, uint64_t guest_phys_addr, uint64_t userspace_addr, uint64_t
offset) "%d:%s: size:0x%"PRIx64" GPA:0x%"PRIx64" QVA/userspace:0x%"PRIx64" RB
offset:0x%"PRIx64
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index fbe2743298..2897ff70b3 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -816,7 +816,35 @@ out:
static int vhost_user_postcopy_fault_handler(struct PostCopyFD *pcfd,
void *ufd)
{
- return 0;
+ struct vhost_dev *dev = pcfd->data;
+ struct vhost_user *u = dev->opaque;
+ struct uffd_msg *msg = ufd;
+ uint64_t faultaddr = msg->arg.pagefault.address;
+ RAMBlock *rb = NULL;
+ uint64_t rb_offset;
+ int i;
+
+ trace_vhost_user_postcopy_fault_handler(pcfd->idstr, faultaddr,
+ dev->mem->nregions);
+ for (i = 0; i < MIN(dev->mem->nregions, u->region_rb_len); i++) {
+ trace_vhost_user_postcopy_fault_handler_loop(i,
+ u->postcopy_client_bases[i], dev->mem->regions[i].memory_size);
+ if (faultaddr >= u->postcopy_client_bases[i]) {
+ /* Ofset of the fault address in the vhost region */
+ uint64_t region_offset = faultaddr - u->postcopy_client_bases[i];
+ if (region_offset <= dev->mem->regions[i].memory_size) {
+ rb_offset = region_offset + u->region_rb_offset[i];
+ trace_vhost_user_postcopy_fault_handler_found(i,
+ region_offset, rb_offset);
+ rb = u->region_rb[i];
+ return postcopy_request_shared_page(pcfd, rb, faultaddr,
+ rb_offset);
+ }
+ }
+ }
+ error_report("%s: Failed to find region for fault %" PRIx64,
+ __func__, faultaddr);
+ return -1;
}
/*
--
2.13.5
- [Qemu-devel] [RFC v2 13/32] vhost+postcopy: Register shared ufd with postcopy, (continued)
- [Qemu-devel] [RFC v2 13/32] vhost+postcopy: Register shared ufd with postcopy, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 14/32] vhost+postcopy: Transmit 'listen' to client, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 15/32] vhost+postcopy: Register new regions with the ufd, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 16/32] vhost+postcopy: Send address back to qemu, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 17/32] vhost+postcopy: Stash RAMBlock and offset, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 18/32] vhost+postcopy: Send requests to source for shared pages, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 19/32] vhost+postcopy: Resolve client address,
Dr. David Alan Gilbert (git) <=
- [Qemu-devel] [RFC v2 20/32] postcopy: wake shared, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 21/32] postcopy: postcopy_notify_shared_wake, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 22/32] vhost+postcopy: Add vhost waker, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 23/32] vhost+postcopy: Call wakeups, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 24/32] vub+postcopy: madvises, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 25/32] vhost+postcopy: Lock around set_mem_table, Dr. David Alan Gilbert (git), 2017/08/24