08b1df8ff4
This property can be useful for distros to set up known-good ROM sizes for migration purposes. The VM will fail to start if the ROM is too large, and migration compatibility will not be broken if the ROM is too small. Note that even though romsize is a uint32_t, it has to be between 1 (because empty ROM files are not accepted, and romsize must be greater than the file) and 2^31 (because values above are not powers of two and are rejected). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Message-Id: <20201218182736.1634344-1-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210203131828.156467-3-pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Edmondson <david.edmondson@oracle.com> Acked-by: Laszlo Ersek <lersek@redhat.com>
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/*
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* This is splited from hw/i386/kvm/pci-assign.c
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "hw/loader.h"
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#include "hw/pci/pci.h"
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#include "xen_pt.h"
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/*
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* Scan the assigned devices for the devices that have an option ROM, and then
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* load the corresponding ROM data to RAM. If an error occurs while loading an
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* option ROM, we just ignore that option ROM and continue with the next one.
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*/
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void *pci_assign_dev_load_option_rom(PCIDevice *dev,
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int *size, unsigned int domain,
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unsigned int bus, unsigned int slot,
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unsigned int function)
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{
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char name[32], rom_file[64];
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FILE *fp;
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uint8_t val;
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struct stat st;
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void *ptr = NULL;
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Object *owner = OBJECT(dev);
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/* If loading ROM from file, pci handles it */
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if (dev->romfile || !dev->rom_bar) {
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return NULL;
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}
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snprintf(rom_file, sizeof(rom_file),
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"/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom",
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domain, bus, slot, function);
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/* Write "1" to the ROM file to enable it */
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fp = fopen(rom_file, "r+");
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if (fp == NULL) {
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if (errno != ENOENT) {
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error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
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}
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return NULL;
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}
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if (fstat(fileno(fp), &st) == -1) {
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error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno));
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goto close_rom;
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}
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val = 1;
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if (fwrite(&val, 1, 1, fp) != 1) {
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goto close_rom;
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}
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fseek(fp, 0, SEEK_SET);
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if (dev->romsize != -1) {
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if (st.st_size > dev->romsize) {
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error_report("ROM BAR \"%s\" (%ld bytes) is too large for ROM size %u",
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rom_file, (long) st.st_size, dev->romsize);
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goto close_rom;
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}
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} else {
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dev->romsize = st.st_size;
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}
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snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner));
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memory_region_init_ram(&dev->rom, owner, name, dev->romsize, &error_abort);
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ptr = memory_region_get_ram_ptr(&dev->rom);
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memset(ptr, 0xff, dev->romsize);
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if (!fread(ptr, 1, st.st_size, fp)) {
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error_report("pci-assign: Cannot read from host %s", rom_file);
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error_printf("Device option ROM contents are probably invalid "
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"(check dmesg).\nSkip option ROM probe with rombar=0, "
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"or load from file with romfile=\n");
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goto close_rom;
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}
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pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom);
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dev->has_rom = true;
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*size = st.st_size;
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close_rom:
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/* Write "0" to disable ROM */
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fseek(fp, 0, SEEK_SET);
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val = 0;
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if (!fwrite(&val, 1, 1, fp)) {
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XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file");
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}
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fclose(fp);
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return ptr;
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}
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