mirror of
git://git.proxmox.com/git/qemu-server.git
synced 2025-01-21 18:03:56 +03:00
390e77d438
This moves all error output to stderr while at it and fixes some bad references to wrong paths in some error messages. Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <sys/stat.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
#define eprintf(...) fprintf(stderr, __VA_ARGS__)
|
|
|
|
#define OUTPUT_DIR "/run/qemu-server"
|
|
#define OUTPUT_FILENAME "host-hw-capabilities.json"
|
|
#define OUTPUT_PATH OUTPUT_DIR "/" OUTPUT_FILENAME
|
|
|
|
typedef struct {
|
|
bool sev_support;
|
|
bool sev_es_support;
|
|
bool sev_snp_support;
|
|
|
|
uint8_t cbitpos;
|
|
uint8_t reduced_phys_bits;
|
|
} cpu_caps_t;
|
|
|
|
void query_cpu_capabilities(cpu_caps_t *res) {
|
|
uint32_t eax, ebx, ecx, edx;
|
|
|
|
// query Encrypted Memory Capabilities, see:
|
|
// https://en.wikipedia.org/wiki/CPUID#EAX=8000001Fh:_Encrypted_Memory_Capabilities
|
|
uint32_t query_function = 0x8000001F;
|
|
asm volatile("cpuid"
|
|
: "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
|
|
: "0"(query_function)
|
|
);
|
|
|
|
res->sev_support = (eax & (1<<1)) != 0;
|
|
res->sev_es_support = (eax & (1<<3)) != 0;
|
|
res->sev_snp_support = (eax & (1<<4)) != 0;
|
|
|
|
res->cbitpos = ebx & 0x3f;
|
|
res->reduced_phys_bits = (ebx >> 6) & 0x3f;
|
|
}
|
|
|
|
int main() {
|
|
cpu_caps_t caps;
|
|
query_cpu_capabilities(&caps);
|
|
|
|
// Check that the directory exists and create it if it does not.
|
|
struct stat statbuf;
|
|
int ret = stat(OUTPUT_DIR, &statbuf);
|
|
if (ret == 0) {
|
|
if (!S_ISDIR(statbuf.st_mode)) {
|
|
eprintf("Path '" OUTPUT_DIR "' already exists but is not a directory.\n");
|
|
return 1;
|
|
}
|
|
} else if (errno == ENOENT) {
|
|
if (mkdir(OUTPUT_DIR, 0755) != 0) {
|
|
eprintf("Error creating directory '" OUTPUT_DIR "': %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
} else {
|
|
eprintf("Error checking path '" OUTPUT_DIR "': %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
FILE *file = fopen(OUTPUT_PATH, "w");
|
|
if (file == NULL) {
|
|
eprintf("Error opening to file '" OUTPUT_PATH "': %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
ret = fprintf(file,
|
|
"{"
|
|
" \"amd-sev\": {"
|
|
" \"cbitpos\": %u,"
|
|
" \"reduced-phys-bits\": %u,"
|
|
" \"sev-support\": %s,"
|
|
" \"sev-support-es\": %s,"
|
|
" \"sev-support-snp\": %s"
|
|
" }"
|
|
" }\n",
|
|
caps.cbitpos,
|
|
caps.reduced_phys_bits,
|
|
caps.sev_support ? "true" : "false",
|
|
caps.sev_es_support ? "true" : "false",
|
|
caps.sev_snp_support ? "true" : "false"
|
|
);
|
|
if (ret < 0) {
|
|
eprintf("Error writing to file '" OUTPUT_PATH "': %s\n", strerror(errno));
|
|
}
|
|
|
|
ret = fclose(file);
|
|
if (ret != 0) {
|
|
eprintf("Error closing file '" OUTPUT_PATH "': %s\n", strerror(errno));
|
|
}
|
|
|
|
return 0;
|
|
}
|