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rust/hpet: change type of num_timers to usize

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Remove the need to convert after every read of the BqlCell.  Because the
vmstate uses a u8 as the size of the VARRAY, this requires switching
the VARRAY to use num_timers_save; which in turn requires ensuring that
the num_timers_save is always there.  For simplicity do this by
removing support for version 1, which QEMU has not been producing for
~15 years.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2025-05-26 13:52:11 +02:00
parent 4b66abead9
commit b3bf86b893
1 changed files with 12 additions and 12 deletions
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24
rust/hw/timer/hpet/src/device.rs
View file

@ -12,7 +12,7 @@ use std::{
use qemu_api::{
bindings::{
address_space_memory, address_space_stl_le, qdev_prop_bit, qdev_prop_bool,
qdev_prop_uint32, qdev_prop_uint8,
qdev_prop_uint32, qdev_prop_usize,
},
cell::{BqlCell, BqlRefCell},
irq::InterruptSource,
@ -36,9 +36,9 @@ use crate::fw_cfg::HPETFwConfig;
const HPET_REG_SPACE_LEN: u64 = 0x400; // 1024 bytes
/// Minimum recommended hardware implementation.
const HPET_MIN_TIMERS: u8 = 3;
const HPET_MIN_TIMERS: usize = 3;
/// Maximum timers in each timer block.
const HPET_MAX_TIMERS: u8 = 32;
const HPET_MAX_TIMERS: usize = 32;
/// Flags that HPETState.flags supports.
const HPET_FLAG_MSI_SUPPORT_SHIFT: usize = 0;
@ -561,8 +561,8 @@ pub struct HPETState {
/// HPET timer array managed by this timer block.
#[doc(alias = "timer")]
timers: [BqlRefCell<HPETTimer>; HPET_MAX_TIMERS as usize],
num_timers: BqlCell<u8>,
timers: [BqlRefCell<HPETTimer>; HPET_MAX_TIMERS],
num_timers: BqlCell<usize>,
num_timers_save: BqlCell<u8>,
/// Instance id (HPET timer block ID).
@ -572,7 +572,7 @@ pub struct HPETState {
impl HPETState {
// Get num_timers with `usize` type, which is useful to play with array index.
fn get_num_timers(&self) -> usize {
self.num_timers.get().into()
self.num_timers.get()
}
const fn has_msi_flag(&self) -> bool {
@ -854,7 +854,7 @@ impl HPETState {
* also added to the migration stream. Check that it matches the value
* that was configured.
*/
self.num_timers_save.set(self.num_timers.get());
self.num_timers_save.set(self.num_timers.get() as u8);
0
}
@ -884,7 +884,7 @@ impl HPETState {
}
fn validate_num_timers(&self, _version_id: u8) -> bool {
self.num_timers.get() == self.num_timers_save.get()
self.num_timers.get() == self.num_timers_save.get().into()
}
}
@ -911,7 +911,7 @@ qemu_api::declare_properties! {
c"timers",
HPETState,
num_timers,
unsafe { &qdev_prop_uint8 },
unsafe { &qdev_prop_usize },
u8,
default = HPET_MIN_TIMERS
),
@ -1016,16 +1016,16 @@ const VALIDATE_TIMERS_NAME: &CStr = c"num_timers must match";
static VMSTATE_HPET: VMStateDescription = VMStateDescription {
name: c"hpet".as_ptr(),
version_id: 2,
minimum_version_id: 1,
minimum_version_id: 2,
pre_save: Some(hpet_pre_save),
post_load: Some(hpet_post_load),
fields: vmstate_fields! {
vmstate_of!(HPETState, config),
vmstate_of!(HPETState, int_status),
vmstate_of!(HPETState, counter),
vmstate_of!(HPETState, num_timers_save).with_version_id(2),
vmstate_of!(HPETState, num_timers_save),
vmstate_validate!(HPETState, VALIDATE_TIMERS_NAME, HPETState::validate_num_timers),
vmstate_struct!(HPETState, timers[0 .. num_timers], &VMSTATE_HPET_TIMER, BqlRefCell<HPETTimer>, HPETState::validate_num_timers).with_version_id(0),
vmstate_struct!(HPETState, timers[0 .. num_timers_save], &VMSTATE_HPET_TIMER, BqlRefCell<HPETTimer>, HPETState::validate_num_timers).with_version_id(0),
},
subsections: vmstate_subsections! {
VMSTATE_HPET_RTC_IRQ_LEVEL,