[Xen-devel] [PATCH v4 11/14] hvmloader: Load OVMF from modules

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

... and do not include the OVMF ROM into hvmloader anymore.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
Change in V4:
- check if source and dest of ovmf binary does not overlaps

Change in V3:
- change makefile to not include ovmf rom into roms.inc.
- update the struct bios_config with bios destination
---
 tools/firmware/hvmloader/Makefile | 15 +--------------
 tools/firmware/hvmloader/ovmf.c   | 30 +++++++++++++-----------------
 2 files changed, 14 insertions(+), 31 deletions(-)

diff --git a/tools/firmware/hvmloader/Makefile 
b/tools/firmware/hvmloader/Makefile
index ed0bfad..dee1c6b 100644
--- a/tools/firmware/hvmloader/Makefile
+++ b/tools/firmware/hvmloader/Makefile
@@ -43,7 +43,6 @@ endif
 
 CIRRUSVGA_DEBUG ?= n
 
-OVMF_DIR := ../ovmf-dir
 ROMBIOS_DIR := ../rombios
 
 ifeq ($(CONFIG_ROMBIOS),y)
@@ -61,12 +60,6 @@ ROMS :=
 ifeq ($(CONFIG_OVMF),y)
 OBJS += ovmf.o
 CFLAGS += -DENABLE_OVMF
-ifeq ($(OVMF_PATH),)
-       OVMF_ROM := $(OVMF_DIR)/ovmf.bin
-else
-       OVMF_ROM := $(OVMF_PATH)
-endif
-ROMS += $(OVMF_ROM)
 endif
 
 ifeq ($(CONFIG_ROMBIOS),y)
@@ -85,7 +78,7 @@ endif
 all: subdirs-all
        $(MAKE) hvmloader
 
-ovmf.o rombios.o: roms.inc
+rombios.o: roms.inc
 smbios.o: CFLAGS += -D__SMBIOS_DATE__="\"$(SMBIOS_REL_DATE)\""
 
 hvmloader: $(OBJS) acpi/acpi.a
@@ -102,12 +95,6 @@ ifneq ($(ROMBIOS_ROM),)
        echo "#endif" >> $@.new
 endif
 
-ifneq ($(OVMF_ROM),)
-       echo "#ifdef ROM_INCLUDE_OVMF" >> $@.new
-       sh ./mkhex ovmf $(OVMF_ROM) >> $@.new
-       echo "#endif" >> $@.new 
-endif 
-
 ifneq ($(STDVGA_ROM),)
        echo "#ifdef ROM_INCLUDE_VGABIOS" >> $@.new
        sh ./mkhex vgabios_stdvga $(STDVGA_ROM) >> $@.new
diff --git a/tools/firmware/hvmloader/ovmf.c b/tools/firmware/hvmloader/ovmf.c
index 858a2d4..6607e57 100644
--- a/tools/firmware/hvmloader/ovmf.c
+++ b/tools/firmware/hvmloader/ovmf.c
@@ -34,17 +34,10 @@
 #include <xen/hvm/ioreq.h>
 #include <xen/memory.h>
 
-#define ROM_INCLUDE_OVMF
-#include "roms.inc"
-
-#define OVMF_SIZE               (sizeof(ovmf))
 #define OVMF_MAXOFFSET          0x000FFFFFULL
-#define OVMF_BEGIN              (0x100000000ULL - ((OVMF_SIZE + 
OVMF_MAXOFFSET) & ~OVMF_MAXOFFSET))
-#define OVMF_END                (OVMF_BEGIN + OVMF_SIZE)
 #define LOWCHUNK_BEGIN          0x000F0000
 #define LOWCHUNK_SIZE           0x00010000
 #define LOWCHUNK_MAXOFFSET      0x0000FFFF
-#define LOWCHUNK_END            (OVMF_BEGIN + OVMF_SIZE)
 #define OVMF_INFO_PHYSICAL_ADDRESS 0x00001000
 
 extern unsigned char dsdt_anycpu_qemu_xen[];
@@ -97,24 +90,31 @@ static void ovmf_load(const struct bios_config *config,
                       void *bios_addr, uint32_t bios_length)
 {
     xen_pfn_t mfn;
-    uint64_t addr = OVMF_BEGIN;
+    uint64_t addr = 0x100000000ULL
+        - ((bios_length + OVMF_MAXOFFSET) & ~OVMF_MAXOFFSET);
+    uint64_t ovmf_end = addr + bios_length;
+
+    ovmf_config.bios_address = addr;
+    ovmf_config.image_size = bios_length;
 
     /* Copy low-reset vector portion. */
-    memcpy((void *) LOWCHUNK_BEGIN, (uint8_t *) config->image
-           + OVMF_SIZE
-           - LOWCHUNK_SIZE,
+    memcpy((void *) LOWCHUNK_BEGIN,
+           (uint8_t *) bios_addr + bios_length - LOWCHUNK_SIZE,
            LOWCHUNK_SIZE);
 
     /* Ensure we have backing page prior to moving FD. */
-    while ( (addr >> PAGE_SHIFT) != (OVMF_END >> PAGE_SHIFT) )
+    while ( (addr >> PAGE_SHIFT) != (ovmf_end >> PAGE_SHIFT) )
     {
         mfn = (uint32_t) (addr >> PAGE_SHIFT);
         addr += PAGE_SIZE;
         mem_hole_populate_ram(mfn, 1);
     }
 
+    /* Check that source and destination does not overlaps. */
+    BUG_ON(addr + bios_length > (unsigned)bios_addr
+           && addr < (unsigned)bios_addr + bios_length);
     /* Copy FD. */
-    memcpy((void *) OVMF_BEGIN, config->image, OVMF_SIZE);
+    memcpy((void *) ovmf_config.bios_address, bios_addr, bios_length);
 }
 
 static void ovmf_acpi_build_tables(void)
@@ -151,10 +151,6 @@ static void ovmf_setup_e820(void)
 struct bios_config ovmf_config =  {
     .name = "OVMF",
 
-    .image = ovmf,
-    .image_size = sizeof(ovmf),
-
-    .bios_address = OVMF_BEGIN,
     .bios_load = ovmf_load,
 
     .load_roms = 0,
-- 
Anthony PERARD


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