git: cf3ed8e0cd95 - main - bhyve nvme: Inform guests of namespace resize

The branch main has been updated by chuck:

URL: https://cgit.FreeBSD.org/src/commit/?id=cf3ed8e0cd9505f21f614e8208f7afd9cfa4d621

commit cf3ed8e0cd9505f21f614e8208f7afd9cfa4d621
Author:     Chuck Tuffli <chuck@FreeBSD.org>
AuthorDate: 2021-12-15 07:17:55 +0000
Commit:     Chuck Tuffli <chuck@FreeBSD.org>
CommitDate: 2021-12-15 07:17:55 +0000

    bhyve nvme: Inform guests of namespace resize
    
    Register a "block resize" callback to be notified of changes to the
    backing storage for the Namespace. Use this to generate an Asynchronous
    Event Notification, Namespace Attributes Changed when the guest OS
    provides an Asynchronous Event Request.
    
    MFC after:      1 month
    Differential Revision:  https://reviews.freebsd.org/D32953
---
 usr.sbin/bhyve/pci_nvme.c | 46 +++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 43 insertions(+), 3 deletions(-)

diff --git a/usr.sbin/bhyve/pci_nvme.c b/usr.sbin/bhyve/pci_nvme.c
index 6fd1aa14b9e3..07b079ecd4a1 100644
--- a/usr.sbin/bhyve/pci_nvme.c
+++ b/usr.sbin/bhyve/pci_nvme.c
@@ -296,6 +296,7 @@ struct pci_nvme_softc {
 	struct nvme_error_information_entry err_log;
 	struct nvme_health_information_page health_log;
 	struct nvme_firmware_page fw_log;
+	struct nvme_ns_list ns_log;
 
 	struct pci_nvme_blockstore nvstore;
 
@@ -598,15 +599,23 @@ crc16(uint16_t crc, const void *buffer, unsigned int len)
 }
 
 static void
-pci_nvme_init_nsdata(struct pci_nvme_softc *sc,
-    struct nvme_namespace_data *nd, uint32_t nsid,
-    struct pci_nvme_blockstore *nvstore)
+pci_nvme_init_nsdata_size(struct pci_nvme_blockstore *nvstore,
+    struct nvme_namespace_data *nd)
 {
 
 	/* Get capacity and block size information from backing store */
 	nd->nsze = nvstore->size / nvstore->sectsz;
 	nd->ncap = nd->nsze;
 	nd->nuse = nd->nsze;
+}
+
+static void
+pci_nvme_init_nsdata(struct pci_nvme_softc *sc,
+    struct nvme_namespace_data *nd, uint32_t nsid,
+    struct pci_nvme_blockstore *nvstore)
+{
+
+	pci_nvme_init_nsdata_size(nvstore, nd);
 
 	if (nvstore->type == NVME_STOR_BLOCKIF)
 		nvstore->deallocate = blockif_candelete(nvstore->ctx);
@@ -642,6 +651,7 @@ pci_nvme_init_logpages(struct pci_nvme_softc *sc)
 	memset(&sc->err_log, 0, sizeof(sc->err_log));
 	memset(&sc->health_log, 0, sizeof(sc->health_log));
 	memset(&sc->fw_log, 0, sizeof(sc->fw_log));
+	memset(&sc->ns_log, 0, sizeof(sc->ns_log));
 
 	/* Set read/write remainder to round up according to spec */
 	sc->read_dunits_remainder = 999;
@@ -1363,6 +1373,13 @@ nvme_opc_get_log_page(struct pci_nvme_softc* sc, struct nvme_command* command,
 		    MIN(logsize, sizeof(sc->fw_log)),
 		    NVME_COPY_TO_PRP);
 		break;
+	case NVME_LOG_CHANGED_NAMESPACE:
+		nvme_prp_memcpy(sc->nsc_pi->pi_vmctx, command->prp1,
+		    command->prp2, (uint8_t *)&sc->ns_log,
+		    MIN(logsize, sizeof(sc->ns_log)),
+		    NVME_COPY_TO_PRP);
+		memset(&sc->ns_log, 0, sizeof(sc->ns_log));
+		break;
 	default:
 		DPRINTF("%s get log page %x command not supported",
 		        __func__, logpage);
@@ -2970,6 +2987,28 @@ pci_nvme_parse_config(struct pci_nvme_softc *sc, nvlist_t *nvl)
 	return (0);
 }
 
+static void
+pci_nvme_resized(struct blockif_ctxt *bctxt, void *arg, size_t new_size)
+{
+	struct pci_nvme_softc *sc;
+	struct pci_nvme_blockstore *nvstore;
+	struct nvme_namespace_data *nd;
+
+	sc = arg;
+	nvstore = &sc->nvstore;
+	nd = &sc->nsdata;
+
+	nvstore->size = new_size;
+	pci_nvme_init_nsdata_size(nvstore, nd);
+
+	/* Add changed NSID to list */
+	sc->ns_log.ns[0] = 1;
+	sc->ns_log.ns[1] = 0;
+
+	pci_nvme_aen_post(sc, PCI_NVME_AE_TYPE_NOTICE,
+	    PCI_NVME_AE_INFO_NS_ATTR_CHANGED);
+}
+
 static int
 pci_nvme_init(struct vmctx *ctx, struct pci_devinst *pi, nvlist_t *nvl)
 {
@@ -3035,6 +3074,7 @@ pci_nvme_init(struct vmctx *ctx, struct pci_devinst *pi, nvlist_t *nvl)
 
 	pthread_mutex_init(&sc->mtx, NULL);
 	sem_init(&sc->iosemlock, 0, sc->ioslots);
+	blockif_register_resize_callback(sc->nvstore.ctx, pci_nvme_resized, sc);
 
 	pci_nvme_init_queues(sc, sc->max_queues, sc->max_queues);
 	/*