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 --- sound/isa/adlib.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 sound/isa/adlib.c (limited to 'sound/isa/adlib.c') diff --git a/sound/isa/adlib.c b/sound/isa/adlib.c new file mode 100644 index 000000000..03fb2bce9 --- /dev/null +++ b/sound/isa/adlib.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AdLib FM card driver. + */ + +#include +#include +#include +#include +#include +#include + +#define CRD_NAME "AdLib FM" +#define DEV_NAME "adlib" + +MODULE_DESCRIPTION(CRD_NAME); +MODULE_AUTHOR("Rene Herman"); +MODULE_LICENSE("GPL"); + +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; +static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; +static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; + +module_param_array(index, int, NULL, 0444); +MODULE_PARM_DESC(index, "Index value for " CRD_NAME " soundcard."); +module_param_array(id, charp, NULL, 0444); +MODULE_PARM_DESC(id, "ID string for " CRD_NAME " soundcard."); +module_param_array(enable, bool, NULL, 0444); +MODULE_PARM_DESC(enable, "Enable " CRD_NAME " soundcard."); +module_param_hw_array(port, long, ioport, NULL, 0444); +MODULE_PARM_DESC(port, "Port # for " CRD_NAME " driver."); + +static int snd_adlib_match(struct device *dev, unsigned int n) +{ + if (!enable[n]) + return 0; + + if (port[n] == SNDRV_AUTO_PORT) { + dev_err(dev, "please specify port\n"); + return 0; + } + return 1; +} + +static int snd_adlib_probe(struct device *dev, unsigned int n) +{ + struct snd_card *card; + struct snd_opl3 *opl3; + int error; + + error = snd_devm_card_new(dev, index[n], id[n], THIS_MODULE, 0, &card); + if (error < 0) { + dev_err(dev, "could not create card\n"); + return error; + } + + card->private_data = devm_request_region(dev, port[n], 4, CRD_NAME); + if (!card->private_data) { + dev_err(dev, "could not grab ports\n"); + return -EBUSY; + } + + strscpy(card->driver, DEV_NAME); + strscpy(card->shortname, CRD_NAME); + sprintf(card->longname, CRD_NAME " at %#lx", port[n]); + + error = snd_opl3_create(card, port[n], port[n] + 2, OPL3_HW_AUTO, 1, &opl3); + if (error < 0) { + dev_err(dev, "could not create OPL\n"); + return error; + } + + error = snd_opl3_hwdep_new(opl3, 0, 0, NULL); + if (error < 0) { + dev_err(dev, "could not create FM\n"); + return error; + } + + error = snd_card_register(card); + if (error < 0) { + dev_err(dev, "could not register card\n"); + return error; + } + + dev_set_drvdata(dev, card); + return 0; +} + +static struct isa_driver snd_adlib_driver = { + .match = snd_adlib_match, + .probe = snd_adlib_probe, + + .driver = { + .name = DEV_NAME + } +}; + +module_isa_driver(snd_adlib_driver, SNDRV_CARDS); -- cgit v1.3.1