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hv: Avoid using SMBIOS major version

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Previously it is (falsely) assumed that the major_ver of 32-bit SMBIOS
entry point structure (which is called SMBIOS 2.1 in spec, or SMBIOS2 in code)
will have a value of 2 and major_ver of 64-bit SMBIOS (which is called SMBIOS
3.0 in spec, and SMBIOS3 in code) will have a value of 3. This turned out to be
wrong. This major_ver refers to the implemented doc revision, and 32-bit SMBIOS2
can have its major_ver to be 3 (current most recent implementation).

This patch removes the use of major_ver to distinguish between
SMBIOS2/3, and use a doc-defined anchor string instead.

Tracked-On: #6528
Signed-off-by: Yifan Liu <yifan1.liu@intel.com>
This commit is contained in:
Yifan Liu 2021-09-01 14:12:12 +08:00 committed by wenlingz
parent a0b3f1cfc8
commit 0a1ad45b32
1 changed files with 2 additions and 5 deletions
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7
hypervisor/quirks/security_vm_fixup.c
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@ -119,7 +119,6 @@ struct smbios_info {
struct smbios2_entry_point eps2;
struct smbios3_entry_point eps3;
} smbios_eps;
uint8_t major_ver;
size_t smbios_eps_size;
void *smbios_table;
size_t smbios_table_size;
@ -150,7 +149,6 @@ static inline void get_smbios3_info(struct smbios3_entry_point *eps3, struct smb
memcpy_s(&si->smbios_eps, si->smbios_eps_size, eps3, si->smbios_eps_size);
si->smbios_table = hpa2hva(eps3->st_addr);
si->smbios_table_size = eps3->max_st_size;
si->major_ver = eps3->major_ver;
}
static inline void get_smbios2_info(struct smbios2_entry_point *eps2, struct smbios_info *si)
@ -159,7 +157,6 @@ static inline void get_smbios2_info(struct smbios2_entry_point *eps2, struct smb
memcpy_s(&si->smbios_eps, si->smbios_eps_size, eps2, si->smbios_eps_size);
si->smbios_table = hpa2hva(eps2->st_addr);
si->smbios_table_size = eps2->st_length;
si->major_ver = eps2->major_ver;
}
static void generate_checksum(uint8_t *byte_start, int nbytes, uint8_t *checksum_pos)
@ -198,7 +195,7 @@ static int copy_smbios_to_guest(struct acrn_vm *vm, struct smbios_info *si)
gpa = VIRT_SMBIOS_TABLE_ADDR;
ret = copy_to_gpa(vm, si->smbios_table, gpa, si->smbios_table_size);
if (ret == 0) {
if (si->major_ver == 2) {
if (strncmp("_SM_", si->smbios_eps.eps2.anchor, 4) == 0) {
struct smbios2_entry_point *eps2 = &si->smbios_eps.eps2;
eps2->st_addr = (uint32_t)gpa;
/* If we wrote generate_checksum(eps->int_anchor, ...), the code scanning tool will
@ -207,7 +204,7 @@ static int copy_smbios_to_guest(struct acrn_vm *vm, struct smbios_info *si)
generate_checksum((uint8_t *)eps2 + offsetof(struct smbios2_entry_point, int_anchor),
0xf, &eps2->int_checksum);
generate_checksum((uint8_t *)eps2, eps2->length, &eps2->checksum);
} else if (si->major_ver == 3) {
} else if (strncmp("_SM3_", si->smbios_eps.eps3.anchor, 5) == 0) {
struct smbios3_entry_point *eps3 = &si->smbios_eps.eps3;
eps3->st_addr = (uint32_t)gpa;
generate_checksum((uint8_t *)eps3, eps3->length, &eps3->checksum);