acpi: accept byte and word access to core ACPI registers

All ISA registers should be accessible as bytes, words or dwords
(if wide enough).  Fix the access constraints for acpi-pm-evt,
acpi-pm-tmr & acpi-cnt registers.

Fixes: 5d971f9 (memory: Revert "memory: accept mismatching sizes in memory_region_access_valid")
Fixes: afafe4b (apci: switch cnt to memory api)
Fixes: 77d58b1 (apci: switch timer to memory api)
Fixes: b5a7c02 (apci: switch evt to memory api)
Buglink: https://lore.kernel.org/xen-devel/[email protected]/T/
Buglink: https://bugs.debian.org/964793
BugLink: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964247
BugLink: https://bugs.launchpad.net/bugs/1886318
Reported-By: Simon John <[email protected]>
Signed-off-by: Michael Tokarev <[email protected]>
Message-Id: <[email protected]>
Cc: [email protected]
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
(cherry picked from commit dba04c3)
Signed-off-by: Michael Roth <[email protected]>

Author: Michael Tokarev

hw/acpi/core.c

@@ -461,7 +461,8 @@ static void acpi_pm_evt_write(void *opaque, hwaddr addr, uint64_t val,
 static const MemoryRegionOps acpi_pm_evt_ops = {
     .read = acpi_pm_evt_read,
     .write = acpi_pm_evt_write,
-    .valid.min_access_size = 2,
+    .impl.min_access_size = 2,
+    .valid.min_access_size = 1,
     .valid.max_access_size = 2,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
@@ -530,7 +531,8 @@ static void acpi_pm_tmr_write(void *opaque, hwaddr addr, uint64_t val,
 static const MemoryRegionOps acpi_pm_tmr_ops = {
     .read = acpi_pm_tmr_read,
     .write = acpi_pm_tmr_write,
-    .valid.min_access_size = 4,
+    .impl.min_access_size = 4,
+    .valid.min_access_size = 1,
     .valid.max_access_size = 4,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
@@ -602,7 +604,8 @@ static void acpi_pm_cnt_write(void *opaque, hwaddr addr, uint64_t val,
 static const MemoryRegionOps acpi_pm_cnt_ops = {
     .read = acpi_pm_cnt_read,
     .write = acpi_pm_cnt_write,
-    .valid.min_access_size = 2,
+    .impl.min_access_size = 2,
+    .valid.min_access_size = 1,
     .valid.max_access_size = 2,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };