From d32c2291e836f912a72aedaf2ace31d4e1679f95 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Date: Wed, 6 Nov 2024 17:31:16 +0100 Subject: [PATCH 26/38] vfio/migration: Report only stop-copy size in vfio_state_pending_exact() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Cédric Le Goater RH-MergeRequest: 283: vfio/migration: Report only stop-copy size in vfio_state_pending_exact() RH-Jira: RHEL-64308 RH-Acked-by: Peter Xu RH-Acked-by: Alex Williamson RH-Commit: [1/2] 85956ae33c6aea99dba95500595e0ca7dc9dcdad (clegoate/qemu-kvm-c9s) JIRA: https://issues.redhat.com/browse/RHEL-64308 commit 3b5948f808e3b99aedfa0aff45cffbe8b7ec07ed Author: Avihai Horon Date: Sun Oct 20 16:01:06 2024 +0300 vfio/migration: Report only stop-copy size in vfio_state_pending_exact() vfio_state_pending_exact() is used to update migration core how much device data is left for the device migration. Currently, the sum of pre-copy and stop-copy sizes of the VFIO device are reported. The pre-copy size is obtained via the VFIO_MIG_GET_PRECOPY_INFO ioctl, which returns the amount of device data available to be transferred while the device is in the PRE_COPY states. The stop-copy size is obtained via the VFIO_DEVICE_FEATURE_MIG_DATA_SIZE ioctl, which returns the total amount of device data left to be transferred in order to complete the device migration. According to the above, current implementation is wrong -- it reports extra overlapping data because pre-copy size is already contained in stop-copy size. Fix it by reporting only stop-copy size. Fixes: eda7362af959 ("vfio/migration: Add VFIO migration pre-copy support") Signed-off-by: Avihai Horon Reviewed-by: Cédric Le Goater Signed-off-by: Cédric Le Goater --- hw/vfio/migration.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 262d42a46e..dd717e8d6c 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -576,9 +576,6 @@ static void vfio_state_pending_exact(void *opaque, uint64_t *must_precopy, if (vfio_device_state_is_precopy(vbasedev)) { vfio_query_precopy_size(migration); - - *must_precopy += - migration->precopy_init_size + migration->precopy_dirty_size; } trace_vfio_state_pending_exact(vbasedev->name, *must_precopy, *can_postcopy, -- 2.39.3