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With KVM_CAP_XSAVE, userspace uses a hardcoded 4KB buffer to get/set xstate data from/to KVM. This doesn't work when dynamic xfeatures (e.g. AMX) are exposed to the guest as they require a larger buffer size. Introduce a new capability (KVM_CAP_XSAVE2). Userspace VMM gets the required xstate buffer size via KVM_CHECK_EXTENSION(KVM_CAP_XSAVE2). KVM_SET_XSAVE is extended to work with both legacy and new capabilities by doing properly-sized memdup_user() based on the guest fpu container. KVM_GET_XSAVE is kept for backward-compatible reason. Instead, KVM_GET_XSAVE2 is introduced under KVM_CAP_XSAVE2 as the preferred interface for getting xstate buffer (4KB or larger size) from KVM (Link: https://lkml.org/lkml/2021/12/15/510) Also, update the api doc with the new KVM_GET_XSAVE2 ioctl. Signed-off-by: Guang Zeng <guang.zeng@intel.com> Signed-off-by: Wei Wang <wei.w.wang@intel.com> Signed-off-by: Jing Liu <jing2.liu@intel.com> Signed-off-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Yang Zhong <yang.zhong@intel.com> Message-Id: <20220105123532.12586-19-yang.zhong@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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| .. | ||
| a.out.h | ||
| auxvec.h | ||
| bitsperlong.h | ||
| boot.h | ||
| bootparam.h | ||
| byteorder.h | ||
| debugreg.h | ||
| e820.h | ||
| hw_breakpoint.h | ||
| hwcap2.h | ||
| ist.h | ||
| Kbuild | ||
| kvm_para.h | ||
| kvm_perf.h | ||
| kvm.h | ||
| ldt.h | ||
| mce.h | ||
| mman.h | ||
| msgbuf.h | ||
| msr.h | ||
| mtrr.h | ||
| perf_regs.h | ||
| posix_types_32.h | ||
| posix_types_64.h | ||
| posix_types_x32.h | ||
| posix_types.h | ||
| prctl.h | ||
| processor-flags.h | ||
| ptrace-abi.h | ||
| ptrace.h | ||
| sembuf.h | ||
| setup.h | ||
| sgx.h | ||
| shmbuf.h | ||
| sigcontext32.h | ||
| sigcontext.h | ||
| siginfo.h | ||
| signal.h | ||
| stat.h | ||
| statfs.h | ||
| svm.h | ||
| swab.h | ||
| ucontext.h | ||
| unistd.h | ||
| vm86.h | ||
| vmx.h | ||
| vsyscall.h | ||