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vfio/ap: Change saved_pfn to saved_iova 

The vfio_ap_ops code maintains both nib address and its PFN, which
is redundant, merely because vfio_pin/unpin_pages API wanted pfn.
Since vfio_pin/unpin_pages() now accept "iova", change "saved_pfn"
to "saved_iova" and remove pfn in the vfio_ap_validate_nib().

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Tested-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/20220723020256.30081-7-nicolinc@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Nicolin Chen 2022-07-22 19:02:52 -07:00 committed by Alex Williamson
parent 44abdd1646
commit 3fad3a2613
2 changed files with 19 additions and 27 deletions
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42
drivers/s390/crypto/vfio_ap_ops.c
View File

@ -112,7 +112,7 @@ static void vfio_ap_wait_for_irqclear(int apqn)
*
* Unregisters the ISC in the GIB when the saved ISC not invalid.
* Unpins the guest's page holding the NIB when it exists.
* Resets the saved_pfn and saved_isc to invalid values.
* Resets the saved_iova and saved_isc to invalid values.
*/
static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
{
@ -123,9 +123,9 @@ static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
kvm_s390_gisc_unregister(q->matrix_mdev->kvm, q->saved_isc);
q->saved_isc = VFIO_AP_ISC_INVALID;
}
if (q->saved_pfn && !WARN_ON(!q->matrix_mdev)) {
vfio_unpin_pages(&q->matrix_mdev->vdev, q->saved_pfn << PAGE_SHIFT, 1);
q->saved_pfn = 0;
if (q->saved_iova && !WARN_ON(!q->matrix_mdev)) {
vfio_unpin_pages(&q->matrix_mdev->vdev, q->saved_iova, 1);
q->saved_iova = 0;
}
}
@ -189,27 +189,19 @@ end_free:
*
* @vcpu: the object representing the vcpu executing the PQAP(AQIC) instruction.
* @nib: the location for storing the nib address.
* @g_pfn: the location for storing the page frame number of the page containing
* the nib.
*
* When the PQAP(AQIC) instruction is executed, general register 2 contains the
* address of the notification indicator byte (nib) used for IRQ notification.
* This function parses the nib from gr2 and calculates the page frame
* number for the guest of the page containing the nib. The values are
* stored in @nib and @g_pfn respectively.
*
* The g_pfn of the nib is then validated to ensure the nib address is valid.
* This function parses and validates the nib from gr2.
*
* Return: returns zero if the nib address is a valid; otherwise, returns
* -EINVAL.
*/
static int vfio_ap_validate_nib(struct kvm_vcpu *vcpu, unsigned long *nib,
unsigned long *g_pfn)
static int vfio_ap_validate_nib(struct kvm_vcpu *vcpu, dma_addr_t *nib)
{
*nib = vcpu->run->s.regs.gprs[2];
*g_pfn = *nib >> PAGE_SHIFT;
if (kvm_is_error_hva(gfn_to_hva(vcpu->kvm, *g_pfn)))
if (kvm_is_error_hva(gfn_to_hva(vcpu->kvm, *nib >> PAGE_SHIFT)))
return -EINVAL;
return 0;
@ -239,34 +231,34 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
int isc,
struct kvm_vcpu *vcpu)
{
unsigned long nib;
struct ap_qirq_ctrl aqic_gisa = {};
struct ap_queue_status status = {};
struct kvm_s390_gisa *gisa;
int nisc;
struct kvm *kvm;
unsigned long g_pfn, h_pfn;
unsigned long h_pfn;
phys_addr_t h_nib;
dma_addr_t nib;
int ret;
/* Verify that the notification indicator byte address is valid */
if (vfio_ap_validate_nib(vcpu, &nib, &g_pfn)) {
VFIO_AP_DBF_WARN("%s: invalid NIB address: nib=%#lx, g_pfn=%#lx, apqn=%#04x\n",
__func__, nib, g_pfn, q->apqn);
if (vfio_ap_validate_nib(vcpu, &nib)) {
VFIO_AP_DBF_WARN("%s: invalid NIB address: nib=%pad, apqn=%#04x\n",
__func__, &nib, q->apqn);
status.response_code = AP_RESPONSE_INVALID_ADDRESS;
return status;
}
ret = vfio_pin_pages(&q->matrix_mdev->vdev, g_pfn << PAGE_SHIFT, 1,
ret = vfio_pin_pages(&q->matrix_mdev->vdev, nib, 1,
IOMMU_READ | IOMMU_WRITE, &h_pfn);
switch (ret) {
case 1:
break;
default:
VFIO_AP_DBF_WARN("%s: vfio_pin_pages failed: rc=%d,"
"nib=%#lx, g_pfn=%#lx, apqn=%#04x\n",
__func__, ret, nib, g_pfn, q->apqn);
"nib=%pad, apqn=%#04x\n",
__func__, ret, &nib, q->apqn);
status.response_code = AP_RESPONSE_INVALID_ADDRESS;
return status;
@ -296,12 +288,12 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
case AP_RESPONSE_NORMAL:
/* See if we did clear older IRQ configuration */
vfio_ap_free_aqic_resources(q);
q->saved_pfn = g_pfn;
q->saved_iova = nib;
q->saved_isc = isc;
break;
case AP_RESPONSE_OTHERWISE_CHANGED:
/* We could not modify IRQ setings: clear new configuration */
vfio_unpin_pages(&q->matrix_mdev->vdev, g_pfn << PAGE_SHIFT, 1);
vfio_unpin_pages(&q->matrix_mdev->vdev, nib, 1);
kvm_s390_gisc_unregister(kvm, isc);
break;
default:

4
drivers/s390/crypto/vfio_ap_private.h
View File

@ -99,13 +99,13 @@ struct ap_matrix_mdev {
* struct vfio_ap_queue - contains the data associated with a queue bound to the
* vfio_ap device driver
* @matrix_mdev: the matrix mediated device
* @saved_pfn: the guest PFN pinned for the guest
* @saved_iova: the notification indicator byte (nib) address
* @apqn: the APQN of the AP queue device
* @saved_isc: the guest ISC registered with the GIB interface
*/
struct vfio_ap_queue {
struct ap_matrix_mdev *matrix_mdev;
unsigned long saved_pfn;
dma_addr_t saved_iova;
int apqn;
#define VFIO_AP_ISC_INVALID 0xff
unsigned char saved_isc;