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Bhyve: fix SMBIOS Type 17 table generation

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According to the SMBIOS specification (revision 2.7 or newer), the
extended module size field should only be used for sizes that can't
fit in the older size field.

Reviewed by:	rgrimes, grehan, jhb
Differential Revision:	https://reviews.freebsd.org/D24107
This commit is contained in:
Rebecca Cran 2020-03-31 02:36:39 +00:00
parent 431f2b8712
commit e23fe873b2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=359478
1 changed files with 30 additions and 11 deletions
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41
usr.sbin/bhyve/smbiostbl.c
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@ -255,7 +255,7 @@ struct smbios_table_type17 {
uint16_t errhand; /* handle of mem error data */
uint16_t twidth; /* total width in bits */
uint16_t dwidth; /* data width in bits */
uint16_t size; /* size in bytes */
uint16_t size; /* size in kb or mb */
uint8_t form; /* form factor */
uint8_t set; /* set */
uint8_t dloc; /* device locator string */
@ -268,7 +268,7 @@ struct smbios_table_type17 {
uint8_t asset; /* asset tag string */
uint8_t part; /* part number string */
uint8_t attributes; /* attributes */
uint32_t xsize; /* extended size in mbs */
uint32_t xsize; /* extended size in mb */
uint16_t curspeed; /* current speed in mhz */
uint16_t minvoltage; /* minimum voltage */
uint16_t maxvoltage; /* maximum voltage */
@ -444,7 +444,7 @@ struct smbios_table_type17 smbios_type17_template = {
-1, /* handle of memory error data */
64, /* total width in bits including ecc */
64, /* data width in bits */
0x7fff, /* size in bytes (0x7fff=use extended)*/
0, /* size in kb or mb (0x7fff=use extended)*/
SMBIOS_MDFF_UNKNOWN,
0, /* set (0x00=none, 0xff=unknown) */
1, /* device locator string */
@ -695,20 +695,39 @@ smbios_type17_initializer(struct smbios_structure *template_entry,
uint16_t *n, uint16_t *size)
{
struct smbios_table_type17 *type17;
uint64_t memsize, size_KB, size_MB;
smbios_generic_initializer(template_entry, template_strings,
curaddr, endaddr, n, size);
type17 = (struct smbios_table_type17 *)curaddr;
type17->arrayhand = type16_handle;
type17->xsize = guest_lomem;
if (guest_himem > 0) {
curaddr = *endaddr;
smbios_generic_initializer(template_entry, template_strings,
curaddr, endaddr, n, size);
type17 = (struct smbios_table_type17 *)curaddr;
type17->arrayhand = type16_handle;
type17->xsize = guest_himem;
memsize = guest_lomem + guest_himem;
size_KB = memsize / 1024;
size_MB = memsize / MB;
/* A single Type 17 entry can't represent more than ~2PB RAM */
if (size_MB > 0x7FFFFFFF) {
printf("Warning: guest memory too big for SMBIOS Type 17 table: "
"%luMB greater than max supported 2147483647MB\n", size_MB);
size_MB = 0x7FFFFFFF;
}
/* See SMBIOS 2.7.0 section 7.18 - Memory Device (Type 17) */
if (size_KB <= 0x7FFF) {
/* Can represent up to 32767KB with the top bit set */
type17->size = size_KB | (1 << 15);
} else if (size_MB < 0x7FFF) {
/* Can represent up to 32766MB with the top bit unset */
type17->size = size_MB & 0x7FFF;
} else {
type17->size = 0x7FFF;
/*
* Can represent up to 2147483647MB (~2PB)
* The top bit is reserved
*/
type17->xsize = size_MB & 0x7FFFFFFF;
}
return (0);