From: Steve Sistare <steven.sist...@oracle.com> Do not reset a vfio-pci device during CPR.
Signed-off-by: Steve Sistare <steven.sist...@oracle.com> Acked-by: Michael S. Tsirkin <m...@redhat.com> Link: https://lore.kernel.org/qemu-devel/1749576403-25355-1-git-send-email-steven.sist...@oracle.com Signed-off-by: Cédric Le Goater <c...@redhat.com> --- include/hw/pci/pci.h | 2 ++ hw/pci/pci.c | 5 +++++ hw/vfio/pci.c | 7 +++++++ 3 files changed, 14 insertions(+) diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index 35d59d7672e2b9ca43ae2f9708e94a07c04f9784..df3cc7b8750014454bd5ab4c3e9a3feca122eca3 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -222,6 +222,8 @@ enum { QEMU_PCIE_EXT_TAG = (1 << QEMU_PCIE_EXT_TAG_BITNR), #define QEMU_PCI_CAP_PM_BITNR 14 QEMU_PCI_CAP_PM = (1 << QEMU_PCI_CAP_PM_BITNR), +#define QEMU_PCI_SKIP_RESET_ON_CPR_BITNR 15 + QEMU_PCI_SKIP_RESET_ON_CPR = (1 << QEMU_PCI_SKIP_RESET_ON_CPR_BITNR), }; typedef struct PCIINTxRoute { diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 9b4bf48439ed225e6b443f067928a84950f12a88..c70b5ceebaf1f2b10768bd030526cbb518da2b8d 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -32,6 +32,7 @@ #include "hw/pci/pci_host.h" #include "hw/qdev-properties.h" #include "hw/qdev-properties-system.h" +#include "migration/cpr.h" #include "migration/qemu-file-types.h" #include "migration/vmstate.h" #include "net/net.h" @@ -537,6 +538,10 @@ static void pci_reset_regions(PCIDevice *dev) static void pci_do_device_reset(PCIDevice *dev) { + if ((dev->cap_present & QEMU_PCI_SKIP_RESET_ON_CPR) && cpr_is_incoming()) { + return; + } + pci_device_deassert_intx(dev); assert(dev->irq_state == 0); diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 89f9246416a700ecbfb21ec3921b5a71cadf9981..b97261c61b4f303cb799e4ed6cdce391c198353c 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -3411,6 +3411,13 @@ static void vfio_instance_init(Object *obj) /* QEMU_PCI_CAP_EXPRESS initialization does not depend on QEMU command * line, therefore, no need to wait to realize like other devices */ pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS; + + /* + * A device that is resuming for cpr is already configured, so do not + * reset it during qemu_system_reset prior to cpr load, else interrupts + * may be lost. + */ + pci_dev->cap_present |= QEMU_PCI_SKIP_RESET_ON_CPR; } static void vfio_pci_base_dev_class_init(ObjectClass *klass, const void *data) -- 2.49.0
