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authorPaolo Bonzini <pbonzini@redhat.com>2023-01-11 21:31:53 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2023-01-11 21:31:53 +0300
commit71d0393576e9e1ef536c3bc3cf11f661c58dded9 (patch)
tree6eb6628858b125717955b8fb0f943fe442d6c63d /Documentation
parent3a9ae31ac26a58d33008c42f6cd022afc2af2dc0 (diff)
parentde535c0234dd2dbd9c790790f2ca1c4ec8a52d2b (diff)
downloadlinux-71d0393576e9e1ef536c3bc3cf11f661c58dded9.tar.xz
Merge tag 'kvmarm-fixes-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-master
KVM/arm64 fixes for 6.2, take #1 - Fix the PMCR_EL0 reset value after the PMU rework - Correctly handle S2 fault triggered by a S1 page table walk by not always classifying it as a write, as this breaks on R/O memslots - Document why we cannot exit with KVM_EXIT_MMIO when taking a write fault from a S1 PTW on a R/O memslot - Put the Apple M2 on the naughty step for not being able to correctly implement the vgic SEIS feature, just liek the M1 before it - Reviewer updates: Alex is stepping down, replaced by Zenghui
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/virt/kvm/api.rst8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index d8ea37dfddf4..9807b05a1b57 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -1354,6 +1354,14 @@ the memory region are automatically reflected into the guest. For example, an
mmap() that affects the region will be made visible immediately. Another
example is madvise(MADV_DROP).
+Note: On arm64, a write generated by the page-table walker (to update
+the Access and Dirty flags, for example) never results in a
+KVM_EXIT_MMIO exit when the slot has the KVM_MEM_READONLY flag. This
+is because KVM cannot provide the data that would be written by the
+page-table walker, making it impossible to emulate the access.
+Instead, an abort (data abort if the cause of the page-table update
+was a load or a store, instruction abort if it was an instruction
+fetch) is injected in the guest.
4.36 KVM_SET_TSS_ADDR
---------------------