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author | David S. Miller <davem@davemloft.net> | 2017-12-16 22:11:55 -0500 |
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committer | David S. Miller <davem@davemloft.net> | 2017-12-16 22:11:55 -0500 |
commit | c30abd5e40dd863f88e26be09b6ce949145a630a (patch) | |
tree | 5b25362084308502a336d8da26b8dc7430d7c812 /Documentation/virtual/kvm/api.txt | |
parent | 28dc4c8f4557d82e9be020e85e2362239270e704 (diff) | |
parent | f3b5ad89de16f5d42e8ad36fbdf85f705c1ae051 (diff) | |
download | linux-c30abd5e40dd863f88e26be09b6ce949145a630a.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Three sets of overlapping changes, two in the packet scheduler
and one in the meson-gxl PHY driver.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/virtual/kvm/api.txt')
-rw-r--r-- | Documentation/virtual/kvm/api.txt | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index f670e4b9e7f3..57d3ee9e4bde 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2901,14 +2901,19 @@ userspace buffer and its length: struct kvm_s390_irq_state { __u64 buf; - __u32 flags; + __u32 flags; /* will stay unused for compatibility reasons */ __u32 len; - __u32 reserved[4]; + __u32 reserved[4]; /* will stay unused for compatibility reasons */ }; Userspace passes in the above struct and for each pending interrupt a struct kvm_s390_irq is copied to the provided buffer. +The structure contains a flags and a reserved field for future extensions. As +the kernel never checked for flags == 0 and QEMU never pre-zeroed flags and +reserved, these fields can not be used in the future without breaking +compatibility. + If -ENOBUFS is returned the buffer provided was too small and userspace may retry with a bigger buffer. @@ -2932,10 +2937,14 @@ containing a struct kvm_s390_irq_state: struct kvm_s390_irq_state { __u64 buf; + __u32 flags; /* will stay unused for compatibility reasons */ __u32 len; - __u32 pad; + __u32 reserved[4]; /* will stay unused for compatibility reasons */ }; +The restrictions for flags and reserved apply as well. +(see KVM_S390_GET_IRQ_STATE) + The userspace memory referenced by buf contains a struct kvm_s390_irq for each interrupt to be injected into the guest. If one of the interrupts could not be injected for some reason the |