2022-06-06 13:33:15 -07:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* s390 kvm PCI passthrough support
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*
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* Copyright IBM Corp. 2022
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*
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* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
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*/
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#include <linux/kvm_host.h>
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#include <linux/pci.h>
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2022-06-06 13:33:16 -07:00
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#include <asm/pci.h>
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#include <asm/pci_insn.h>
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2022-06-06 13:33:19 -07:00
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#include <asm/pci_io.h>
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2022-06-06 13:33:20 -07:00
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#include <asm/sclp.h>
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2022-06-06 13:33:15 -07:00
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#include "pci.h"
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2022-06-06 13:33:20 -07:00
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#include "kvm-s390.h"
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2022-06-06 13:33:15 -07:00
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2022-06-06 13:33:16 -07:00
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struct zpci_aift *aift;
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static inline int __set_irq_noiib(u16 ctl, u8 isc)
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{
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union zpci_sic_iib iib = {{0}};
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return zpci_set_irq_ctrl(ctl, isc, &iib);
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}
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void kvm_s390_pci_aen_exit(void)
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{
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unsigned long flags;
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struct kvm_zdev **gait_kzdev;
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lockdep_assert_held(&aift->aift_lock);
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/*
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* Contents of the aipb remain registered for the life of the host
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* kernel, the information preserved in zpci_aipb and zpci_aif_sbv
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* in case we insert the KVM module again later. Clear the AIFT
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* information and free anything not registered with underlying
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* firmware.
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*/
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spin_lock_irqsave(&aift->gait_lock, flags);
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gait_kzdev = aift->kzdev;
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aift->gait = NULL;
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aift->sbv = NULL;
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aift->kzdev = NULL;
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spin_unlock_irqrestore(&aift->gait_lock, flags);
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kfree(gait_kzdev);
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}
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static int zpci_setup_aipb(u8 nisc)
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{
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struct page *page;
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int size, rc;
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zpci_aipb = kzalloc(sizeof(union zpci_sic_iib), GFP_KERNEL);
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if (!zpci_aipb)
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return -ENOMEM;
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2022-09-15 10:55:14 -07:00
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aift->sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC, NULL);
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2022-06-06 13:33:16 -07:00
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if (!aift->sbv) {
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rc = -ENOMEM;
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goto free_aipb;
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}
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zpci_aif_sbv = aift->sbv;
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size = get_order(PAGE_ALIGN(ZPCI_NR_DEVICES *
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sizeof(struct zpci_gaite)));
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page = alloc_pages(GFP_KERNEL | __GFP_ZERO, size);
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if (!page) {
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rc = -ENOMEM;
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goto free_sbv;
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}
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2022-09-07 08:59:52 -07:00
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aift->gait = (struct zpci_gaite *)page_to_virt(page);
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2022-06-06 13:33:16 -07:00
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zpci_aipb->aipb.faisb = virt_to_phys(aift->sbv->vector);
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zpci_aipb->aipb.gait = virt_to_phys(aift->gait);
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zpci_aipb->aipb.afi = nisc;
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zpci_aipb->aipb.faal = ZPCI_NR_DEVICES;
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/* Setup Adapter Event Notification Interpretation */
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if (zpci_set_irq_ctrl(SIC_SET_AENI_CONTROLS, 0, zpci_aipb)) {
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rc = -EIO;
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goto free_gait;
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}
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return 0;
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free_gait:
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free_pages((unsigned long)aift->gait, size);
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free_sbv:
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airq_iv_release(aift->sbv);
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zpci_aif_sbv = NULL;
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free_aipb:
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kfree(zpci_aipb);
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zpci_aipb = NULL;
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return rc;
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}
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static int zpci_reset_aipb(u8 nisc)
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{
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/*
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* AEN registration can only happen once per system boot. If
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* an aipb already exists then AEN was already registered and
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* we can re-use the aipb contents. This can only happen if
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* the KVM module was removed and re-inserted. However, we must
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* ensure that the same forwarding ISC is used as this is assigned
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* during KVM module load.
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*/
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if (zpci_aipb->aipb.afi != nisc)
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return -EINVAL;
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aift->sbv = zpci_aif_sbv;
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2023-02-22 08:55:02 -07:00
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aift->gait = phys_to_virt(zpci_aipb->aipb.gait);
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2022-06-06 13:33:16 -07:00
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return 0;
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}
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int kvm_s390_pci_aen_init(u8 nisc)
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{
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int rc = 0;
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/* If already enabled for AEN, bail out now */
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if (aift->gait || aift->sbv)
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return -EPERM;
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mutex_lock(&aift->aift_lock);
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2022-10-25 18:32:33 -07:00
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aift->kzdev = kcalloc(ZPCI_NR_DEVICES, sizeof(struct kvm_zdev *),
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2022-06-06 13:33:16 -07:00
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GFP_KERNEL);
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if (!aift->kzdev) {
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rc = -ENOMEM;
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goto unlock;
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}
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if (!zpci_aipb)
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rc = zpci_setup_aipb(nisc);
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else
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rc = zpci_reset_aipb(nisc);
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if (rc)
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goto free_zdev;
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/* Enable floating IRQs */
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if (__set_irq_noiib(SIC_IRQ_MODE_SINGLE, nisc)) {
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rc = -EIO;
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kvm_s390_pci_aen_exit();
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}
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goto unlock;
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free_zdev:
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kfree(aift->kzdev);
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unlock:
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mutex_unlock(&aift->aift_lock);
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return rc;
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}
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2022-06-06 13:33:19 -07:00
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/* Modify PCI: Register floating adapter interruption forwarding */
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static int kvm_zpci_set_airq(struct zpci_dev *zdev)
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{
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u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
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struct zpci_fib fib = {};
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u8 status;
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fib.fmt0.isc = zdev->kzdev->fib.fmt0.isc;
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fib.fmt0.sum = 1; /* enable summary notifications */
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fib.fmt0.noi = airq_iv_end(zdev->aibv);
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fib.fmt0.aibv = virt_to_phys(zdev->aibv->vector);
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fib.fmt0.aibvo = 0;
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fib.fmt0.aisb = virt_to_phys(aift->sbv->vector + (zdev->aisb / 64) * 8);
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fib.fmt0.aisbo = zdev->aisb & 63;
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fib.gd = zdev->gisa;
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return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
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}
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/* Modify PCI: Unregister floating adapter interruption forwarding */
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static int kvm_zpci_clear_airq(struct zpci_dev *zdev)
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{
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u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
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struct zpci_fib fib = {};
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u8 cc, status;
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fib.gd = zdev->gisa;
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cc = zpci_mod_fc(req, &fib, &status);
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if (cc == 3 || (cc == 1 && status == 24))
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/* Function already gone or IRQs already deregistered. */
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cc = 0;
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return cc ? -EIO : 0;
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}
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static inline void unaccount_mem(unsigned long nr_pages)
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{
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struct user_struct *user = get_uid(current_user());
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if (user)
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atomic_long_sub(nr_pages, &user->locked_vm);
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if (current->mm)
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atomic64_sub(nr_pages, ¤t->mm->pinned_vm);
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}
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static inline int account_mem(unsigned long nr_pages)
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{
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struct user_struct *user = get_uid(current_user());
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unsigned long page_limit, cur_pages, new_pages;
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page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
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do {
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cur_pages = atomic_long_read(&user->locked_vm);
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new_pages = cur_pages + nr_pages;
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if (new_pages > page_limit)
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return -ENOMEM;
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} while (atomic_long_cmpxchg(&user->locked_vm, cur_pages,
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new_pages) != cur_pages);
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atomic64_add(nr_pages, ¤t->mm->pinned_vm);
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return 0;
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}
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static int kvm_s390_pci_aif_enable(struct zpci_dev *zdev, struct zpci_fib *fib,
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bool assist)
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{
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struct page *pages[1], *aibv_page, *aisb_page = NULL;
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unsigned int msi_vecs, idx;
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struct zpci_gaite *gaite;
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unsigned long hva, bit;
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struct kvm *kvm;
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phys_addr_t gaddr;
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int rc = 0, gisc, npages, pcount = 0;
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/*
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* Interrupt forwarding is only applicable if the device is already
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* enabled for interpretation
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*/
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if (zdev->gisa == 0)
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return -EINVAL;
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kvm = zdev->kzdev->kvm;
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msi_vecs = min_t(unsigned int, fib->fmt0.noi, zdev->max_msi);
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/* Get the associated forwarding ISC - if invalid, return the error */
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gisc = kvm_s390_gisc_register(kvm, fib->fmt0.isc);
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if (gisc < 0)
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return gisc;
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/* Replace AIBV address */
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idx = srcu_read_lock(&kvm->srcu);
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hva = gfn_to_hva(kvm, gpa_to_gfn((gpa_t)fib->fmt0.aibv));
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npages = pin_user_pages_fast(hva, 1, FOLL_WRITE | FOLL_LONGTERM, pages);
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srcu_read_unlock(&kvm->srcu, idx);
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if (npages < 1) {
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rc = -EIO;
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goto out;
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}
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aibv_page = pages[0];
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pcount++;
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gaddr = page_to_phys(aibv_page) + (fib->fmt0.aibv & ~PAGE_MASK);
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fib->fmt0.aibv = gaddr;
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/* Pin the guest AISB if one was specified */
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if (fib->fmt0.sum == 1) {
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idx = srcu_read_lock(&kvm->srcu);
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hva = gfn_to_hva(kvm, gpa_to_gfn((gpa_t)fib->fmt0.aisb));
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npages = pin_user_pages_fast(hva, 1, FOLL_WRITE | FOLL_LONGTERM,
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pages);
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srcu_read_unlock(&kvm->srcu, idx);
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if (npages < 1) {
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rc = -EIO;
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goto unpin1;
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}
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aisb_page = pages[0];
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pcount++;
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}
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/* Account for pinned pages, roll back on failure */
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if (account_mem(pcount))
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goto unpin2;
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/* AISB must be allocated before we can fill in GAITE */
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mutex_lock(&aift->aift_lock);
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bit = airq_iv_alloc_bit(aift->sbv);
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if (bit == -1UL)
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goto unlock;
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zdev->aisb = bit; /* store the summary bit number */
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zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA |
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AIRQ_IV_BITLOCK |
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AIRQ_IV_GUESTVEC,
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phys_to_virt(fib->fmt0.aibv));
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spin_lock_irq(&aift->gait_lock);
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gaite = (struct zpci_gaite *)aift->gait + (zdev->aisb *
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sizeof(struct zpci_gaite));
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/* If assist not requested, host will get all alerts */
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if (assist)
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gaite->gisa = (u32)virt_to_phys(&kvm->arch.sie_page2->gisa);
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else
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gaite->gisa = 0;
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gaite->gisc = fib->fmt0.isc;
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gaite->count++;
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gaite->aisbo = fib->fmt0.aisbo;
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gaite->aisb = virt_to_phys(page_address(aisb_page) + (fib->fmt0.aisb &
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~PAGE_MASK));
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aift->kzdev[zdev->aisb] = zdev->kzdev;
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spin_unlock_irq(&aift->gait_lock);
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/* Update guest FIB for re-issue */
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fib->fmt0.aisbo = zdev->aisb & 63;
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fib->fmt0.aisb = virt_to_phys(aift->sbv->vector + (zdev->aisb / 64) * 8);
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fib->fmt0.isc = gisc;
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/* Save some guest fib values in the host for later use */
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zdev->kzdev->fib.fmt0.isc = fib->fmt0.isc;
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zdev->kzdev->fib.fmt0.aibv = fib->fmt0.aibv;
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mutex_unlock(&aift->aift_lock);
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/* Issue the clp to setup the irq now */
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rc = kvm_zpci_set_airq(zdev);
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return rc;
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unlock:
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mutex_unlock(&aift->aift_lock);
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unpin2:
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if (fib->fmt0.sum == 1)
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unpin_user_page(aisb_page);
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unpin1:
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unpin_user_page(aibv_page);
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out:
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return rc;
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}
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static int kvm_s390_pci_aif_disable(struct zpci_dev *zdev, bool force)
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{
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struct kvm_zdev *kzdev = zdev->kzdev;
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struct zpci_gaite *gaite;
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struct page *vpage = NULL, *spage = NULL;
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int rc, pcount = 0;
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u8 isc;
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if (zdev->gisa == 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
mutex_lock(&aift->aift_lock);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the clear fails due to an error, leave now unless we know this
|
|
|
|
* device is about to go away (force) -- In that case clear the GAITE
|
|
|
|
* regardless.
|
|
|
|
*/
|
|
|
|
rc = kvm_zpci_clear_airq(zdev);
|
|
|
|
if (rc && !force)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (zdev->kzdev->fib.fmt0.aibv == 0)
|
|
|
|
goto out;
|
|
|
|
spin_lock_irq(&aift->gait_lock);
|
|
|
|
gaite = (struct zpci_gaite *)aift->gait + (zdev->aisb *
|
|
|
|
sizeof(struct zpci_gaite));
|
|
|
|
isc = gaite->gisc;
|
|
|
|
gaite->count--;
|
|
|
|
if (gaite->count == 0) {
|
|
|
|
/* Release guest AIBV and AISB */
|
|
|
|
vpage = phys_to_page(kzdev->fib.fmt0.aibv);
|
|
|
|
if (gaite->aisb != 0)
|
|
|
|
spage = phys_to_page(gaite->aisb);
|
|
|
|
/* Clear the GAIT entry */
|
|
|
|
gaite->aisb = 0;
|
|
|
|
gaite->gisc = 0;
|
|
|
|
gaite->aisbo = 0;
|
|
|
|
gaite->gisa = 0;
|
2022-09-15 10:55:14 -07:00
|
|
|
aift->kzdev[zdev->aisb] = NULL;
|
2022-06-06 13:33:19 -07:00
|
|
|
/* Clear zdev info */
|
|
|
|
airq_iv_free_bit(aift->sbv, zdev->aisb);
|
|
|
|
airq_iv_release(zdev->aibv);
|
|
|
|
zdev->aisb = 0;
|
|
|
|
zdev->aibv = NULL;
|
|
|
|
}
|
|
|
|
spin_unlock_irq(&aift->gait_lock);
|
|
|
|
kvm_s390_gisc_unregister(kzdev->kvm, isc);
|
|
|
|
kzdev->fib.fmt0.isc = 0;
|
|
|
|
kzdev->fib.fmt0.aibv = 0;
|
|
|
|
|
|
|
|
if (vpage) {
|
|
|
|
unpin_user_page(vpage);
|
|
|
|
pcount++;
|
|
|
|
}
|
|
|
|
if (spage) {
|
|
|
|
unpin_user_page(spage);
|
|
|
|
pcount++;
|
|
|
|
}
|
|
|
|
if (pcount > 0)
|
|
|
|
unaccount_mem(pcount);
|
|
|
|
out:
|
|
|
|
mutex_unlock(&aift->aift_lock);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2022-06-06 13:33:15 -07:00
|
|
|
static int kvm_s390_pci_dev_open(struct zpci_dev *zdev)
|
|
|
|
{
|
|
|
|
struct kvm_zdev *kzdev;
|
|
|
|
|
|
|
|
kzdev = kzalloc(sizeof(struct kvm_zdev), GFP_KERNEL);
|
|
|
|
if (!kzdev)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
kzdev->zdev = zdev;
|
|
|
|
zdev->kzdev = kzdev;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void kvm_s390_pci_dev_release(struct zpci_dev *zdev)
|
|
|
|
{
|
|
|
|
struct kvm_zdev *kzdev;
|
|
|
|
|
|
|
|
kzdev = zdev->kzdev;
|
|
|
|
WARN_ON(kzdev->zdev != zdev);
|
|
|
|
zdev->kzdev = NULL;
|
|
|
|
kfree(kzdev);
|
|
|
|
}
|
2022-06-06 13:33:16 -07:00
|
|
|
|
2022-06-06 13:33:20 -07:00
|
|
|
|
|
|
|
/*
|
2023-06-28 07:23:20 -07:00
|
|
|
* Register device with the specified KVM. If interpretation facilities are
|
2022-06-06 13:33:20 -07:00
|
|
|
* available, enable them and let userspace indicate whether or not they will
|
|
|
|
* be used (specify SHM bit to disable).
|
|
|
|
*/
|
2022-08-19 05:29:45 -07:00
|
|
|
static int kvm_s390_pci_register_kvm(void *opaque, struct kvm *kvm)
|
2022-06-06 13:33:20 -07:00
|
|
|
{
|
2022-08-19 05:29:45 -07:00
|
|
|
struct zpci_dev *zdev = opaque;
|
2022-11-09 07:28:59 -07:00
|
|
|
u8 status;
|
2022-06-06 13:33:20 -07:00
|
|
|
int rc;
|
|
|
|
|
|
|
|
if (!zdev)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
mutex_lock(&zdev->kzdev_lock);
|
|
|
|
|
|
|
|
if (zdev->kzdev || zdev->gisa != 0 || !kvm) {
|
|
|
|
mutex_unlock(&zdev->kzdev_lock);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
kvm_get_kvm(kvm);
|
|
|
|
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
|
|
|
|
rc = kvm_s390_pci_dev_open(zdev);
|
|
|
|
if (rc)
|
|
|
|
goto err;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If interpretation facilities aren't available, add the device to
|
|
|
|
* the kzdev list but don't enable for interpretation.
|
|
|
|
*/
|
|
|
|
if (!kvm_s390_pci_interp_allowed())
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If this is the first request to use an interpreted device, make the
|
|
|
|
* necessary vcpu changes
|
|
|
|
*/
|
|
|
|
if (!kvm->arch.use_zpci_interp)
|
|
|
|
kvm_s390_vcpu_pci_enable_interp(kvm);
|
|
|
|
|
|
|
|
if (zdev_enabled(zdev)) {
|
|
|
|
rc = zpci_disable_device(zdev);
|
|
|
|
if (rc)
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Store information about the identity of the kvm guest allowed to
|
|
|
|
* access this device via interpretation to be used by host CLP
|
|
|
|
*/
|
|
|
|
zdev->gisa = (u32)virt_to_phys(&kvm->arch.sie_page2->gisa);
|
|
|
|
|
|
|
|
rc = zpci_enable_device(zdev);
|
|
|
|
if (rc)
|
|
|
|
goto clear_gisa;
|
|
|
|
|
|
|
|
/* Re-register the IOMMU that was already created */
|
|
|
|
rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
|
2022-11-09 07:28:59 -07:00
|
|
|
virt_to_phys(zdev->dma_table), &status);
|
2022-06-06 13:33:20 -07:00
|
|
|
if (rc)
|
|
|
|
goto clear_gisa;
|
|
|
|
|
|
|
|
out:
|
|
|
|
zdev->kzdev->kvm = kvm;
|
|
|
|
|
|
|
|
spin_lock(&kvm->arch.kzdev_list_lock);
|
|
|
|
list_add_tail(&zdev->kzdev->entry, &kvm->arch.kzdev_list);
|
|
|
|
spin_unlock(&kvm->arch.kzdev_list_lock);
|
|
|
|
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
mutex_unlock(&zdev->kzdev_lock);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
clear_gisa:
|
|
|
|
zdev->gisa = 0;
|
|
|
|
err:
|
|
|
|
if (zdev->kzdev)
|
|
|
|
kvm_s390_pci_dev_release(zdev);
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
mutex_unlock(&zdev->kzdev_lock);
|
|
|
|
kvm_put_kvm(kvm);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2022-08-19 05:29:45 -07:00
|
|
|
static void kvm_s390_pci_unregister_kvm(void *opaque)
|
2022-06-06 13:33:20 -07:00
|
|
|
{
|
2022-08-19 05:29:45 -07:00
|
|
|
struct zpci_dev *zdev = opaque;
|
2022-06-06 13:33:20 -07:00
|
|
|
struct kvm *kvm;
|
2022-11-09 07:28:59 -07:00
|
|
|
u8 status;
|
2022-06-06 13:33:20 -07:00
|
|
|
|
|
|
|
if (!zdev)
|
|
|
|
return;
|
|
|
|
|
|
|
|
mutex_lock(&zdev->kzdev_lock);
|
|
|
|
|
|
|
|
if (WARN_ON(!zdev->kzdev)) {
|
|
|
|
mutex_unlock(&zdev->kzdev_lock);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
kvm = zdev->kzdev->kvm;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* A 0 gisa means interpretation was never enabled, just remove the
|
|
|
|
* device from the list.
|
|
|
|
*/
|
|
|
|
if (zdev->gisa == 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* Forwarding must be turned off before interpretation */
|
|
|
|
if (zdev->kzdev->fib.fmt0.aibv != 0)
|
|
|
|
kvm_s390_pci_aif_disable(zdev, true);
|
|
|
|
|
|
|
|
/* Remove the host CLP guest designation */
|
|
|
|
zdev->gisa = 0;
|
|
|
|
|
|
|
|
if (zdev_enabled(zdev)) {
|
|
|
|
if (zpci_disable_device(zdev))
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (zpci_enable_device(zdev))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* Re-register the IOMMU that was already created */
|
|
|
|
zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
|
2022-11-09 07:28:59 -07:00
|
|
|
virt_to_phys(zdev->dma_table), &status);
|
2022-06-06 13:33:20 -07:00
|
|
|
|
|
|
|
out:
|
|
|
|
spin_lock(&kvm->arch.kzdev_list_lock);
|
|
|
|
list_del(&zdev->kzdev->entry);
|
|
|
|
spin_unlock(&kvm->arch.kzdev_list_lock);
|
|
|
|
kvm_s390_pci_dev_release(zdev);
|
|
|
|
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
mutex_unlock(&zdev->kzdev_lock);
|
|
|
|
|
|
|
|
kvm_put_kvm(kvm);
|
|
|
|
}
|
|
|
|
|
|
|
|
void kvm_s390_pci_init_list(struct kvm *kvm)
|
|
|
|
{
|
|
|
|
spin_lock_init(&kvm->arch.kzdev_list_lock);
|
|
|
|
INIT_LIST_HEAD(&kvm->arch.kzdev_list);
|
|
|
|
}
|
|
|
|
|
|
|
|
void kvm_s390_pci_clear_list(struct kvm *kvm)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* This list should already be empty, either via vfio device closures
|
|
|
|
* or kvm fd cleanup.
|
|
|
|
*/
|
|
|
|
spin_lock(&kvm->arch.kzdev_list_lock);
|
|
|
|
WARN_ON_ONCE(!list_empty(&kvm->arch.kzdev_list));
|
|
|
|
spin_unlock(&kvm->arch.kzdev_list_lock);
|
|
|
|
}
|
|
|
|
|
2022-06-06 13:33:24 -07:00
|
|
|
static struct zpci_dev *get_zdev_from_kvm_by_fh(struct kvm *kvm, u32 fh)
|
|
|
|
{
|
|
|
|
struct zpci_dev *zdev = NULL;
|
|
|
|
struct kvm_zdev *kzdev;
|
|
|
|
|
|
|
|
spin_lock(&kvm->arch.kzdev_list_lock);
|
|
|
|
list_for_each_entry(kzdev, &kvm->arch.kzdev_list, entry) {
|
|
|
|
if (kzdev->zdev->fh == fh) {
|
|
|
|
zdev = kzdev->zdev;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
spin_unlock(&kvm->arch.kzdev_list_lock);
|
|
|
|
|
|
|
|
return zdev;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int kvm_s390_pci_zpci_reg_aen(struct zpci_dev *zdev,
|
|
|
|
struct kvm_s390_zpci_op *args)
|
|
|
|
{
|
|
|
|
struct zpci_fib fib = {};
|
|
|
|
bool hostflag;
|
|
|
|
|
|
|
|
fib.fmt0.aibv = args->u.reg_aen.ibv;
|
|
|
|
fib.fmt0.isc = args->u.reg_aen.isc;
|
|
|
|
fib.fmt0.noi = args->u.reg_aen.noi;
|
|
|
|
if (args->u.reg_aen.sb != 0) {
|
|
|
|
fib.fmt0.aisb = args->u.reg_aen.sb;
|
|
|
|
fib.fmt0.aisbo = args->u.reg_aen.sbo;
|
|
|
|
fib.fmt0.sum = 1;
|
|
|
|
} else {
|
|
|
|
fib.fmt0.aisb = 0;
|
|
|
|
fib.fmt0.aisbo = 0;
|
|
|
|
fib.fmt0.sum = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
hostflag = !(args->u.reg_aen.flags & KVM_S390_ZPCIOP_REGAEN_HOST);
|
|
|
|
return kvm_s390_pci_aif_enable(zdev, &fib, hostflag);
|
|
|
|
}
|
|
|
|
|
|
|
|
int kvm_s390_pci_zpci_op(struct kvm *kvm, struct kvm_s390_zpci_op *args)
|
|
|
|
{
|
|
|
|
struct kvm_zdev *kzdev;
|
|
|
|
struct zpci_dev *zdev;
|
|
|
|
int r;
|
|
|
|
|
|
|
|
zdev = get_zdev_from_kvm_by_fh(kvm, args->fh);
|
|
|
|
if (!zdev)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
mutex_lock(&zdev->kzdev_lock);
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
|
|
|
|
kzdev = zdev->kzdev;
|
|
|
|
if (!kzdev) {
|
|
|
|
r = -ENODEV;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (kzdev->kvm != kvm) {
|
|
|
|
r = -EPERM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (args->op) {
|
|
|
|
case KVM_S390_ZPCIOP_REG_AEN:
|
|
|
|
/* Fail on unknown flags */
|
|
|
|
if (args->u.reg_aen.flags & ~KVM_S390_ZPCIOP_REGAEN_HOST) {
|
|
|
|
r = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
r = kvm_s390_pci_zpci_reg_aen(zdev, args);
|
|
|
|
break;
|
|
|
|
case KVM_S390_ZPCIOP_DEREG_AEN:
|
|
|
|
r = kvm_s390_pci_aif_disable(zdev, false);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
r = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
mutex_unlock(&zdev->kzdev_lock);
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
2022-11-30 16:09:12 -07:00
|
|
|
int __init kvm_s390_pci_init(void)
|
2022-06-06 13:33:16 -07:00
|
|
|
{
|
2022-09-20 12:30:25 -07:00
|
|
|
zpci_kvm_hook.kvm_register = kvm_s390_pci_register_kvm;
|
|
|
|
zpci_kvm_hook.kvm_unregister = kvm_s390_pci_unregister_kvm;
|
|
|
|
|
|
|
|
if (!kvm_s390_pci_interp_allowed())
|
|
|
|
return 0;
|
|
|
|
|
2022-06-06 13:33:16 -07:00
|
|
|
aift = kzalloc(sizeof(struct zpci_aift), GFP_KERNEL);
|
|
|
|
if (!aift)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
spin_lock_init(&aift->gait_lock);
|
|
|
|
mutex_init(&aift->aift_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void kvm_s390_pci_exit(void)
|
|
|
|
{
|
2022-08-19 05:29:45 -07:00
|
|
|
zpci_kvm_hook.kvm_register = NULL;
|
|
|
|
zpci_kvm_hook.kvm_unregister = NULL;
|
2022-06-06 13:33:16 -07:00
|
|
|
|
2022-09-20 12:30:25 -07:00
|
|
|
if (!kvm_s390_pci_interp_allowed())
|
|
|
|
return;
|
|
|
|
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mutex_destroy(&aift->aift_lock);
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2022-06-06 13:33:16 -07:00
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kfree(aift);
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|
}
|