[Xen-devel] [PATCH v4 2/2] tools/libacpi: announce that PVHv2 has no CMOS RTC in FADT

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

At the moment this flag is unconditionally set for PVHv2 domains. Note that
using this boot flag requires that the FADT table revision is at least 5 (or any
later version), so bump the current FADT version from 4 to 5 and add two new
fields that will be unused.

Reported-by: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: boris.ostrovsky@xxxxxxxxxx
Cc: konrad.wilk@xxxxxxxxxx
---
Changes since v3:
 - Rebase on top of previous patch.
---
Ideally this should be somehow fetched from the emulation_flags set of flags,
but sadly there's no way for hvmloader (which runs in guest context) to fetch
this information. If at some point a rtc option is added to libxl, we should see
about passing it through to init_acpi_config in libxl_x86_acpi.c so that we can
then appropriately set this flag for PVHv2 guests.
---
 tools/firmware/hvmloader/util.c | 2 +-
 tools/libacpi/acpi2_0.h         | 1 +
 tools/libacpi/build.c           | 9 +++++++++
 tools/libacpi/libacpi.h         | 1 +
 4 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/firmware/hvmloader/util.c b/tools/firmware/hvmloader/util.c
index f2bec51..03cfb79 100644
--- a/tools/firmware/hvmloader/util.c
+++ b/tools/firmware/hvmloader/util.c
@@ -951,7 +951,7 @@ void hvmloader_acpi_build_tables(struct acpi_config *config,
     config->table_flags |= (ACPI_HAS_TCPA | ACPI_HAS_IOAPIC |
                             ACPI_HAS_WAET | ACPI_HAS_PMTIMER |
                             ACPI_HAS_BUTTONS | ACPI_HAS_VGA |
-                            ACPI_HAS_8042);
+                            ACPI_HAS_8042 | ACPI_HAS_CMOS_RTC);
     config->acpi_revision = 4;
 
     config->tis_hdr = (uint16_t *)ACPI_TIS_HDR_ADDRESS;
diff --git a/tools/libacpi/acpi2_0.h b/tools/libacpi/acpi2_0.h
index 5715197..2619ba3 100644
--- a/tools/libacpi/acpi2_0.h
+++ b/tools/libacpi/acpi2_0.h
@@ -233,6 +233,7 @@ struct acpi_fadt {
 #define ACPI_FADT_LEGACY_DEVICES    (1 << 0)
 #define ACPI_FADT_8042              (1 << 1)
 #define ACPI_FADT_NO_VGA            (1 << 2)
+#define ACPI_FADT_NO_CMOS_RTC       (1 << 5)
 
 /*
  * FADT Fixed Feature Flags.
diff --git a/tools/libacpi/build.c b/tools/libacpi/build.c
index 6bd50b3..a02ffbf 100644
--- a/tools/libacpi/build.c
+++ b/tools/libacpi/build.c
@@ -613,6 +613,15 @@ int acpi_build_tables(struct acpi_ctxt *ctxt, struct 
acpi_config *config)
         fadt->iapc_boot_arch |= ACPI_FADT_NO_VGA;
     if ( config->table_flags & ACPI_HAS_8042 )
         fadt->iapc_boot_arch |= ACPI_FADT_8042;
+    if ( !(config->table_flags & ACPI_HAS_CMOS_RTC) )
+    {
+        if ( fadt->header.revision < 5 )
+        {
+            printf("ACPI_FADT_NO_CMOS_RTC requires FADT revision 5\n");
+            return -1;
+        }
+        fadt->iapc_boot_arch |= ACPI_FADT_NO_CMOS_RTC;
+    }
     set_checksum(fadt, offsetof(struct acpi_header, checksum), fadt_size);
 
     nr_secondaries = construct_secondary_tables(ctxt, secondary_tables,
diff --git a/tools/libacpi/libacpi.h b/tools/libacpi/libacpi.h
index dbc6c8b..67bd67f 100644
--- a/tools/libacpi/libacpi.h
+++ b/tools/libacpi/libacpi.h
@@ -34,6 +34,7 @@
 #define ACPI_HAS_BUTTONS     (1<<11)
 #define ACPI_HAS_VGA         (1<<12)
 #define ACPI_HAS_8042        (1<<13)
+#define ACPI_HAS_CMOS_RTC    (1<<14)
 
 struct xen_vmemrange;
 struct acpi_numa {
-- 
2.9.3 (Apple Git-75)


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