linux/arch/s390/kvm, branch master

Merge tag 'kvm-s390-master-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

2026-05-12T21:15:38Z

KVM: s390: pci: fix array indexing For large amounts of PCI devices its possible to overrun the arrays as the index was miscalculated in 2 places.

KVM: s390: pci: Fix aisb calculation

2026-04-27T09:14:45Z

The current implementation of aisb calculation will erroneously index via an unsigned long * as well as multiply by 8B for every 64-bits in the offset; only one or the other is required. This throws off aisb calculations once the number of devices exceeds 64, and can result in out-of-bounds access as well as failure to indicate summary bits associated with those devices in guests. Fix this by converting to a physical address before applying the offset, as is already done in arch/s390/pci/pci_irq.c. Fixes: 3c5a1b6f0a18 ("KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding") Signed-off-by: Matthew Rosato Reviewed-by: Niklas Schnelle Signed-off-by: Christian Borntraeger

KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic

2026-04-17T11:12:07Z

kvm_s390_pci_aif_enable(), kvm_s390_pci_aif_disable(), and aen_host_forward() index the GAIT by manually multiplying the index with sizeof(struct zpci_gaite). Since aift->gait is already a struct zpci_gaite pointer, this double-scales the offset, accessing element aisb*16 instead of aisb. This causes out-of-bounds accesses when aisb >= 32 (with ZPCI_NR_DEVICES=512) Fix by removing the erroneous sizeof multiplication. Fixes: 3c5a1b6f0a18 ("KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding") Fixes: 73f91b004321 ("KVM: s390: pci: enable host forwarding of Adapter Event Notifications") Reported-by: Yuhao Jiang Cc: stable@vger.kernel.org Signed-off-by: Junrui Luo Reviewed-by: Christian Borntraeger Reviewed-by: Matthew Rosato Tested-by: Matthew Rosato Signed-off-by: Christian Borntraeger

Merge tag 'kvm-s390-next-7.1-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

2026-04-13T17:01:15Z

- ESA nesting support - 4k memslots - LPSW/E fix

KVM: s390: vsie: Fix races with partial gmap invalidations

2026-04-07T16:20:58Z

Introduce a new boolean flag, used for shadow gmaps, to keep track of whether the gmap has been invalidated, either partially or totally. Use the new flag to check whether shadow gmap invalidations happened during shadowing. In such cases, abort whatever was going on, return -EAGAIN and let the caller try again. Fixes: 19d6c5b80443 ("KVM: s390: vsie: Fix unshadowing while shadowing") Signed-off-by: Claudio Imbrenda Message-ID: <20260407161721.247044-1-imbrenda@linux.ibm.com>

KVM: s390: ucontrol: Fix memslot handling

2026-04-07T15:20:42Z

Fix memslots handling for UCONTROL guests. Attempts to delete user memslots will fail, as they should, without the risk of a NULL pointer dereference. Fixes: 413c98f24c63 ("KVM: s390: fake memslot for ucontrol VMs") Reviewed-by: Steffen Eiden Signed-off-by: Claudio Imbrenda

KVM: s390: Allow 4k granularity for memslots

2026-04-07T15:07:22Z

Until now memslots on s390 needed to have 1M granularity and be 1M aligned. Since the new gmap code can handle memslots with 4k granularity and alignment, remove the restrictions. Reviewed-by: Christian Borntraeger Reviewed-by: Steffen Eiden Signed-off-by: Claudio Imbrenda

KVM: s390: Add alignment checks for hugepages

2026-04-07T15:07:19Z

When backing a guest page with a large page, check that the alignment of the guest page matches the alignment of the host physical page backing it within the large page. Also check that the memslot is large enough to fit the large page. Those checks are currently not needed, because memslots are guaranteed to be 1m-aligned, but this will change. Reviewed-by: Steffen Eiden Signed-off-by: Claudio Imbrenda

KVM: s390: Add some useful mask macros

2026-04-07T15:07:14Z

Add _{SEGMENT,REGION3}_FR_MASK, similar to _{SEGMENT,REGION3}_MASK, but working on gfn/pfn instead of addresses. Use them in gaccess.c instead of using the normal masks plus gpa_to_gfn(). Also add _PAGES_PER_{SEGMENT,REGION3} to make future code more readable. Reviewed-by: Steffen Eiden Signed-off-by: Claudio Imbrenda

KVM: s390: Add KVM capability for ESA mode guests

2026-04-02T13:37:02Z

Now that all the bits are properly addressed, provide a mechanism for testing ESA mode guests in nested configurations. Signed-off-by: Hendrik Brueckner [farman@us.ibm.com: Updated commit message] Reviewed-by: Janosch Frank Signed-off-by: Eric Farman Signed-off-by: Janosch Frank