qemu-kvm/kvm-s390x-pci-RPCIT-second-pass-when-mappings-exhausted.patch

From 2f0febd6813c4ad7f52e43afb3ecce7aef3557e6 Mon Sep 17 00:00:00 2001
From: Matthew Rosato <mjrosato@linux.ibm.com>
Date: Fri, 28 Oct 2022 15:47:56 -0400
Subject: [PATCH 08/11] s390x/pci: RPCIT second pass when mappings exhausted
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RH-Author: Cédric Le Goater <clg@redhat.com>
RH-MergeRequest: 250: s390x/pci: reset ISM passthrough devices on shutdown and system reset
RH-Bugzilla: 2163713
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [1/4] 0b4500b9247725b1ef0b290bb85392300a618cac

If we encounter a new mapping while the number of available DMA entries
in vfio is 0, we are currently skipping that mapping which is a problem
if we manage to free up DMA space after that within the same RPCIT --
we will return to the guest with CC0 and have not mapped everything
within the specified range.  This issue was uncovered while testing
changes to the s390 linux kernel iommu/dma code, where a different
usage pattern was employed (new mappings start at the end of the
aperture and work back towards the front, making us far more likely
to encounter new mappings before invalidated mappings during a
global refresh).

Fix this by tracking whether any mappings were skipped due to vfio
DMA limit hitting 0; when this occurs, we still continue the range
and unmap/map anything we can - then we must re-run the range again
to pickup anything that was missed.  This must occur in a loop until
all requests are satisfied (success) or we detect that we are still
unable to complete all mappings (return ZPCI_RPCIT_ST_INSUFF_RES).

Link: https://lore.kernel.org/linux-s390/20221019144435.369902-1-schnelle@linux.ibm.com/
Fixes: 37fa32de70 ("s390x/pci: Honor DMA limits set by vfio")
Reported-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Message-Id: <20221028194758.204007-2-mjrosato@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit 4a8d21ba50fc8625c3bd51dab903872952f95718)
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
 hw/s390x/s390-pci-inst.c | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 20a9bcc7af..7cc4bcf850 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -677,8 +677,9 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     S390PCIBusDevice *pbdev;
     S390PCIIOMMU *iommu;
     S390IOTLBEntry entry;
-    hwaddr start, end;
+    hwaddr start, end, sstart;
     uint32_t dma_avail;
+    bool again;
 
     if (env->psw.mask & PSW_MASK_PSTATE) {
         s390_program_interrupt(env, PGM_PRIVILEGED, ra);
@@ -691,7 +692,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     }
 
     fh = env->regs[r1] >> 32;
-    start = env->regs[r2];
+    sstart = start = env->regs[r2];
     end = start + env->regs[r2 + 1];
 
     pbdev = s390_pci_find_dev_by_fh(s390_get_phb(), fh);
@@ -732,6 +733,9 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
         goto err;
     }
 
+ retry:
+    start = sstart;
+    again = false;
     while (start < end) {
         error = s390_guest_io_table_walk(iommu->g_iota, start, &entry);
         if (error) {
@@ -739,13 +743,24 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
         }
 
         start += entry.len;
-        while (entry.iova < start && entry.iova < end &&
-               (dma_avail > 0 || entry.perm == IOMMU_NONE)) {
-            dma_avail = s390_pci_update_iotlb(iommu, &entry);
-            entry.iova += TARGET_PAGE_SIZE;
-            entry.translated_addr += TARGET_PAGE_SIZE;
+        while (entry.iova < start && entry.iova < end) {
+            if (dma_avail > 0 || entry.perm == IOMMU_NONE) {
+                dma_avail = s390_pci_update_iotlb(iommu, &entry);
+                entry.iova += TARGET_PAGE_SIZE;
+                entry.translated_addr += TARGET_PAGE_SIZE;
+            } else {
+                /*
+                 * We are unable to make a new mapping at this time, continue
+                 * on and hopefully free up more space.  Then attempt another
+                 * pass.
+                 */
+                again = true;
+                break;
+            }
         }
     }
+    if (again && dma_avail > 0)
+        goto retry;
 err:
     if (error) {
         pbdev->state = ZPCI_FS_ERROR;
-- 
2.37.3