Currently in kvm_emulate_hypercall, KVM_HC_MAP_GPA_RANGE is checked specifically to decide whether a KVM hypercall needs to exit to userspace or not. Do the check based on the hypercall_exit_enabled field of struct kvm_arch. Also use the API user_exit_on_hypercall() to replace the opencode. --- v3: - Rename is_kvm_hc_exit_enabled() to user_exit_on_hypercall(). (Sean) - Remove the WARN_ON_ONCE(). (Isaku, Sean) - Use BIT(hc_nr) instead of (1 << nr) (Yuan) - Added a comment to explain why check the !ret first. (Kai) - Add Kai and Isaku's Reviewed-by. v2: - Check the return value of __kvm_emulate_hypercall() before checking hypercall_exit_enabled to avoid an invalid KVM hypercall nr. https://lore.kernel.org/kvm/184d90a8-14a0-494a-9112-365417245911@xxxxxxxxxxxxxxx/ - Add a warning if a hypercall nr out of the range of hypercall_exit_enabled can express. Binbin Wu (2): KVM: x86: Check hypercall's exit to userspace generically KVM: x86: Use user_exit_on_hypercall() instead of opencode arch/x86/kvm/svm/sev.c | 4 ++-- arch/x86/kvm/x86.c | 7 ++++--- arch/x86/kvm/x86.h | 4 ++++ 3 files changed, 10 insertions(+), 5 deletions(-) base-commit: a1206bc992c3cd3f758a9b46117dfc7e59e8c10f -- 2.46.0
