[PATCH v2 for-5.1] acpi-pm-tmr: allow any small-size reads

[Michael Tokarev]

As found in LP#1886318, MacOS Catalina performs 2-byte reads
on the acpi timer address space while the spec says it should
be 4-byte. Allow any small reads.

Reported-By: Simon John <git@the-jedi.co.uk>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
---
 hw/acpi/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

v2: fixed bug#, use the right form of S-o-b, and allow up to 1 byte reads.

I'm applying this to debian qemu package, need the fix
faster in order to release security updates for other
branches.

diff --git a/hw/acpi/core.c b/hw/acpi/core.c
--- a/hw/acpi/core.c
+++ b/hw/acpi/core.c
@@ -530,7 +530,10 @@ 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,
+     /* at least MacOS Catalina reads 2 bytes and fails if it doesn't work */
+     /* allow 1-byte reads too */
+    .valid.min_access_size = 1,
     .valid.max_access_size = 4,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
-- 
2.20.1