[Xen-devel] [PATCH v5 04/16] libxl/arm: Estimate the size of ACPI tables

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Estimate the size of ACPI tables and reserve a memory map space for ACPI
tables.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
 tools/libxl/libxl_arm_acpi.c | 98 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)

diff --git a/tools/libxl/libxl_arm_acpi.c b/tools/libxl/libxl_arm_acpi.c
index 0851411..b91f3f6 100644
--- a/tools/libxl/libxl_arm_acpi.c
+++ b/tools/libxl/libxl_arm_acpi.c
@@ -34,12 +34,108 @@ extern const unsigned char dsdt_anycpu_arm[];
 _hidden
 extern const int dsdt_anycpu_arm_len;
 
+enum {
+    RSDP,
+    XSDT,
+    GTDT,
+    MADT,
+    FADT,
+    DSDT,
+    NUMS,
+};
+
+struct acpitable {
+    uint64_t addr;
+    size_t size;
+};
+
+static int libxl__estimate_madt_size(libxl__gc *gc,
+                                     libxl_domain_build_info *info,
+                                     xc_domain_configuration_t *xc_config)
+{
+    int rc;
+
+    switch (xc_config->gic_version) {
+    case XEN_DOMCTL_CONFIG_GIC_V2:
+        rc = sizeof(struct acpi_table_madt) +
+             sizeof(struct acpi_madt_generic_interrupt) * info->max_vcpus +
+             sizeof(struct acpi_madt_generic_distributor);
+        break;
+    case XEN_DOMCTL_CONFIG_GIC_V3:
+        rc = sizeof(struct acpi_table_madt) +
+             sizeof(struct acpi_madt_generic_interrupt) * info->max_vcpus +
+             sizeof(struct acpi_madt_generic_distributor) +
+             sizeof(struct acpi_madt_generic_redistributor);
+        break;
+    default:
+        LOG(ERROR, "Unknown GIC version");
+        rc = ERROR_FAIL;
+        break;
+    }
+
+    return rc;
+}
+
+static int libxl__estimate_acpi_size(libxl__gc *gc,
+                                     libxl_domain_build_info *info,
+                                     struct xc_dom_image *dom,
+                                     xc_domain_configuration_t *xc_config,
+                                     struct acpitable acpitables[])
+{
+    int rc;
+
+    acpitables[RSDP].addr = GUEST_ACPI_BASE;
+    acpitables[RSDP].size = sizeof(struct acpi_table_rsdp);
+    dom->acpi_modules[0].length += ROUNDUP(acpitables[RSDP].size, 3);
+
+    acpitables[XSDT].addr = GUEST_ACPI_BASE + dom->acpi_modules[0].length;
+    /*
+     * Currently only 3 tables(GTDT, FADT, MADT) are pointed by XSDT. Alloc
+     * entries for them.
+     */
+    acpitables[XSDT].size = sizeof(struct acpi_table_xsdt) +
+                            sizeof(uint64_t) * 2;
+    dom->acpi_modules[0].length += ROUNDUP(acpitables[XSDT].size, 3);
+
+    acpitables[GTDT].addr = GUEST_ACPI_BASE + dom->acpi_modules[0].length;
+    acpitables[GTDT].size = sizeof(struct acpi_table_gtdt);
+    dom->acpi_modules[0].length += ROUNDUP(acpitables[GTDT].size, 3);
+
+    acpitables[MADT].addr = GUEST_ACPI_BASE + dom->acpi_modules[0].length;
+
+    rc = libxl__estimate_madt_size(gc, info, xc_config);
+    if (rc < 0)
+        goto out;
+
+    acpitables[MADT].size = rc;
+    dom->acpi_modules[0].length += ROUNDUP(acpitables[MADT].size, 3);
+
+    acpitables[FADT].addr = GUEST_ACPI_BASE + dom->acpi_modules[0].length;
+    acpitables[FADT].size = sizeof(struct acpi_table_fadt);
+    dom->acpi_modules[0].length += ROUNDUP(acpitables[FADT].size, 3);
+
+    acpitables[DSDT].addr = GUEST_ACPI_BASE + dom->acpi_modules[0].length;
+    acpitables[DSDT].size = dsdt_anycpu_arm_len;
+    dom->acpi_modules[0].length += ROUNDUP(acpitables[DSDT].size, 3);
+
+    assert(dom->acpi_modules[0].length <= GUEST_ACPI_SIZE);
+    dom->acpi_modules[0].data = libxl__zalloc(gc, dom->acpi_modules[0].length);
+
+    rc = 0;
+out:
+    return rc;
+}
+
 int libxl__prepare_acpi(libxl__gc *gc, libxl_domain_build_info *info,
                         libxl__domain_build_state *state,
                         struct xc_dom_image *dom)
 {
     const libxl_version_info *vers;
     int rc = 0;
+    struct acpitable acpitables[NUMS];
+
+    /* convenience aliases */
+    xc_domain_configuration_t *xc_config = &state->config;
 
     vers = libxl_get_version_info(CTX);
     if (vers == NULL) {
@@ -54,6 +150,8 @@ int libxl__prepare_acpi(libxl__gc *gc, 
libxl_domain_build_info *info,
     dom->acpi_modules[0].length = 0;
     dom->acpi_modules[0].guest_addr_out = GUEST_ACPI_BASE;
 
+    rc = libxl__estimate_acpi_size(gc, info, dom, xc_config, acpitables);
+
 out:
     return rc;
 }
-- 
2.0.4



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