From 93de2a6a4b91b72607136dd656edf03fb399d27f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 23 Sep 2026 09:37:21 -0700 Subject: KVM: SEV: Do cache maintenance on the source VM during intra-host migration Manually perform cache maintenance on the source VM during intra-host migration to ensure no stale data is left in CPU caches after the VM is destroyed. Because the source VM is "converted" to a non-SEV VM, KVM's memory reclaim flows won't trigger cache maintenance, e.g. when all guest memory is reclaimed in response to detaching from the mmu_notifier. Note, relying on the destination VM to do cache maintenance isn't an option as KVM doesn't require identical guest memory configurations, i.e. the source VM may have access to memory that the destination VM does not. Enforcing equivalent memory configurations is infeasible, as it would require a *deep* comparison of memslots, e.g. to verify that not only are the memslot identical, but what the memslots point at is also identical. Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration") Cc: stable@vger.kernel.org Reported-by: Stefan Teodorescu Signed-off-by: Sean Christopherson Message-ID: <20260923163721.1584779-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- drivers/scsi/sim710.c | 242 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 242 insertions(+) create mode 100644 drivers/scsi/sim710.c (limited to 'drivers/scsi/sim710.c') diff --git a/drivers/scsi/sim710.c b/drivers/scsi/sim710.c new file mode 100644 index 000000000..408f37003 --- /dev/null +++ b/drivers/scsi/sim710.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * sim710.c - Copyright (C) 1999 Richard Hirst + * + *---------------------------------------------------------------------------- + *---------------------------------------------------------------------------- + * + * MCA card detection code by Trent McNair. (now deleted) + * Fixes to not explicitly nul bss data from Xavier Bestel. + * Some multiboard fixes from Rolf Eike Beer. + * Auto probing of EISA config space from Trevor Hemsley. + * + * Rewritten to use 53c700.c by James.Bottomley@SteelEye.com + */ + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "53c700.h" + + +/* Must be enough for EISA */ +#define MAX_SLOTS 8 +static __u8 __initdata id_array[MAX_SLOTS] = { [0 ... MAX_SLOTS-1] = 7 }; + +static char *sim710; /* command line passed by insmod */ + +MODULE_AUTHOR("Richard Hirst"); +MODULE_DESCRIPTION("Simple NCR53C710 driver"); +MODULE_LICENSE("GPL"); + +module_param(sim710, charp, 0); + +#ifdef MODULE +#define ARG_SEP ' ' +#else +#define ARG_SEP ',' +#endif + +static __init int +param_setup(char *str) +{ + char *pos = str, *next; + int slot = -1; + + while(pos != NULL && (next = strchr(pos, ':')) != NULL) { + int val = (int)simple_strtoul(++next, NULL, 0); + + if(!strncmp(pos, "slot:", 5)) + slot = val; + else if(!strncmp(pos, "id:", 3)) { + if(slot == -1) { + printk(KERN_WARNING "sim710: Must specify slot for id parameter\n"); + } else if(slot >= MAX_SLOTS) { + printk(KERN_WARNING "sim710: Illegal slot %d for id %d\n", slot, val); + } else { + id_array[slot] = val; + } + } + if((pos = strchr(pos, ARG_SEP)) != NULL) + pos++; + } + return 1; +} +__setup("sim710=", param_setup); + +static struct scsi_host_template sim710_driver_template = { + .name = "LSI (Symbios) 710 EISA", + .proc_name = "sim710", + .this_id = 7, + .module = THIS_MODULE, +}; + +static int sim710_probe_common(struct device *dev, unsigned long base_addr, + int irq, int clock, int differential, + int scsi_id) +{ + struct Scsi_Host * host = NULL; + struct NCR_700_Host_Parameters *hostdata = + kzalloc_obj(struct NCR_700_Host_Parameters); + + printk(KERN_NOTICE "sim710: %s\n", dev_name(dev)); + printk(KERN_NOTICE "sim710: irq = %d, clock = %d, base = 0x%lx, scsi_id = %d\n", + irq, clock, base_addr, scsi_id); + + if(hostdata == NULL) { + printk(KERN_ERR "sim710: Failed to allocate host data\n"); + goto out; + } + + if(request_region(base_addr, 64, "sim710") == NULL) { + printk(KERN_ERR "sim710: Failed to reserve IO region 0x%lx\n", + base_addr); + goto out_free; + } + + /* Fill in the three required pieces of hostdata */ + hostdata->base = ioport_map(base_addr, 64); + hostdata->differential = differential; + hostdata->clock = clock; + hostdata->chip710 = 1; + hostdata->burst_length = 8; + + /* and register the chip */ + if((host = NCR_700_detect(&sim710_driver_template, hostdata, dev)) + == NULL) { + printk(KERN_ERR "sim710: No host detected; card configuration problem?\n"); + goto out_release; + } + host->this_id = scsi_id; + host->base = base_addr; + host->irq = irq; + if (request_irq(irq, NCR_700_intr, IRQF_SHARED, "sim710", host)) { + printk(KERN_ERR "sim710: request_irq failed\n"); + goto out_put_host; + } + + dev_set_drvdata(dev, host); + scsi_scan_host(host); + + return 0; + + out_put_host: + scsi_host_put(host); + out_release: + ioport_unmap(hostdata->base); + release_region(base_addr, 64); + out_free: + kfree(hostdata); + out: + return -ENODEV; +} + +static int sim710_device_remove(struct device *dev) +{ + struct Scsi_Host *host = dev_get_drvdata(dev); + struct NCR_700_Host_Parameters *hostdata = + (struct NCR_700_Host_Parameters *)host->hostdata[0]; + + scsi_remove_host(host); + NCR_700_release(host); + ioport_unmap(hostdata->base); + kfree(hostdata); + free_irq(host->irq, host); + release_region(host->base, 64); + return 0; +} + +#ifdef CONFIG_EISA +static struct eisa_device_id sim710_eisa_ids[] = { + { "CPQ4410" }, + { "CPQ4411" }, + { "HWP0C80" }, + { "" } +}; +MODULE_DEVICE_TABLE(eisa, sim710_eisa_ids); + +static int sim710_eisa_probe(struct device *dev) +{ + struct eisa_device *edev = to_eisa_device(dev); + unsigned long io_addr = edev->base_addr; + char eisa_cpq_irqs[] = { 11, 14, 15, 10, 9, 0 }; + char eisa_hwp_irqs[] = { 3, 4, 5, 7, 12, 10, 11, 0}; + char *eisa_irqs; + unsigned char irq_index; + unsigned char irq, differential = 0, scsi_id = 7; + + if(strcmp(edev->id.sig, "HWP0C80") == 0) { + __u8 val; + eisa_irqs = eisa_hwp_irqs; + irq_index = (inb(io_addr + 0xc85) & 0x7) - 1; + + val = inb(io_addr + 0x4); + scsi_id = ffs(val) - 1; + + if(scsi_id > 7 || (val & ~(1<= strlen(eisa_irqs)) { + printk("sim710.c: irq nasty\n"); + return -ENODEV; + } + + irq = eisa_irqs[irq_index]; + + return sim710_probe_common(dev, io_addr, irq, 50, + differential, scsi_id); +} + +static struct eisa_driver sim710_eisa_driver = { + .id_table = sim710_eisa_ids, + .driver = { + .name = "sim710", + .probe = sim710_eisa_probe, + .remove = sim710_device_remove, + }, +}; +#endif /* CONFIG_EISA */ + +static int __init sim710_init(void) +{ +#ifdef MODULE + if (sim710) + param_setup(sim710); +#endif + +#ifdef CONFIG_EISA + /* + * FIXME: We'd really like to return -ENODEV if no devices have actually + * been found. However eisa_driver_register() only reports problems + * with kobject_register() so simply return success for now. + */ + eisa_driver_register(&sim710_eisa_driver); +#endif + return 0; +} + +static void __exit sim710_exit(void) +{ +#ifdef CONFIG_EISA + eisa_driver_unregister(&sim710_eisa_driver); +#endif +} + +module_init(sim710_init); +module_exit(sim710_exit); -- cgit v1.3.1