David Woodhouse 2619da73bb KVM: x86: Use __DECLARE_FLEX_ARRAY() for UAPI structures with VLAs ... Commit 94dfc73e7c ("treewide: uapi: Replace zero-length arrays with flexible-array members") broke the userspace API for C++. These structures ending in VLAs are typically a *header*, which can be followed by an arbitrary number of entries. Userspace typically creates a larger structure with some non-zero number of entries, for example in QEMU's kvm_arch_get_supported_msr_feature(): struct { struct kvm_msrs info; struct kvm_msr_entry entries[1]; } msr_data = {}; While that works in C, it fails in C++ with an error like: flexible array member 'kvm_msrs::entries' not at end of 'struct msr_data' Fix this by using __DECLARE_FLEX_ARRAY() for the VLA, which uses [0] for C++ compilation. Fixes: 94dfc73e7c ("treewide: uapi: Replace zero-length arrays with flexible-array members") Cc: stable@vger.kernel.org Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Link: https://patch.msgid.link/3abaf6aefd6e5efeff3b860ac38421d9dec908db.camel@infradead.org [sean: tag for stable@] Signed-off-by: Sean Christopherson <seanjc@google.com>		2026-03-12 10:56:10 -07:00
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asm	KVM: x86: Use __DECLARE_FLEX_ARRAY() for UAPI structures with VLAs	2026-03-12 10:56:10 -07:00