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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -39 X-Spam_score: -4.0 X-Spam_bar: ---- X-Spam_report: (-4.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.141, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1.793, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-rust@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: QEMU Rust-related patches and discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 15 Jan 2025 13:08:42 -0000 On 1/8/25 07:45, Zhao Liu wrote: >> #[macro_export] >> macro_rules! vmstate_of { >> - ($struct_name:ty, $field_name:ident $([0 .. $num:ident $(* $factor:expr)?])? $(,)?) => { >> + ($struct_name:ty, $field_name:ident $([0 .. $num:tt $(* $factor:expr)?])? $(,)?) => { > > Why change ident to tt? Rebase mistake. Initially I had $num:tt, however that becomes unclear if you have [0 .. 0] where the second 0 is a field name. >> +impl_vmstate_scalar!(vmstate_info_bool, bool); >> +impl_vmstate_scalar!(vmstate_info_int8, i8); >> +impl_vmstate_scalar!(vmstate_info_int16, i16); >> +impl_vmstate_scalar!(vmstate_info_int32, i32); > > missed VMS_VARRAY_INT32 :-) I left that out intentionally, as Rust is probably going to use IndexMut instead of i32. >> +impl_vmstate_scalar!(vmstate_info_int64, i64); >> +impl_vmstate_scalar!(vmstate_info_uint8, u8, VMS_VARRAY_UINT8); >> +impl_vmstate_scalar!(vmstate_info_uint16, u16, VMS_VARRAY_UINT16); >> +impl_vmstate_scalar!(vmstate_info_uint32, u32, VMS_VARRAY_UINT32); > > If we want to expand in the future (e.g., support vmstate_info_int32_equal > and vmstate_info_int32_le), then introducing new macro variants will be > straightforward. So, fair enough. > >> +impl_vmstate_scalar!(vmstate_info_uint64, u64); > > What about applying this to "usize" with vmstate_info_uint64? There's 32-bit hosts too... So one would have to add vmstate_info_ulong which is serialized as 64-bit. We can add it later, but perhaps we could also create a derive(Index, IndexMut) macro that makes it possible to specify the type of the index. While Rust uses usize instead of uNN for array indices, that does not have to be universal; using uNN is a lot better if it means you can get rid of casts from register values to array indices and back. See for example commit 6b4f7b0705b ("rust: pl011: fix migration stream", 2024-12-19). That is indeed also an issue for HPET, but in that case it can be isolated to a couple lines, let timer_id: usize = ((addr - 0x100) / 0x20) as usize; and it could even be wrapped further fn timer_and_addr(&self, addr: hwaddr) -> Option<&BqlRefCell, hwaddr> { let timer_id: usize = ((addr - 0x100) / 0x20) as usize; if timer_id > self.num_timers.get() { // TODO: Add trace point - trace_hpet_timer_id_out_of_range(timer_id) None } else { Some((self.get_timer(timer_id), addr & 0x18)) } } ... match self.timer_and_addr(addr) { None => 0 // Reserved, Some(timer, addr) => timer.borrow_mut().read(addr, size) } So for HPET you didn't reach the threshold of having to create "pub struct HPETTimers([BqlRefCell; MAX_HPET_TIMERS])" and implement Index<>. Paolo