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query-machine-capabilities: factor out querying the CPU

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to make the code easier to read.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Thomas Lamprecht 2024-11-17 18:51:14 +01:00
parent bd62724fcd
commit 99e54ad6c3
1 changed files with 25 additions and 11 deletions
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36
query-machine-capabilities/query-machine-capabilities.c
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@ -5,7 +5,16 @@
#include <errno.h>
#include <string.h>
int main() {
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:
@ -16,12 +25,17 @@ int main() {
: "0"(query_function)
);
bool sev_support = (eax & (1<<1)) != 0;
bool sev_es_support = (eax & (1<<3)) != 0;
bool sev_snp_support = (eax & (1<<4)) != 0;
res->sev_support = (eax & (1<<1)) != 0;
res->sev_es_support = (eax & (1<<3)) != 0;
res->sev_snp_support = (eax & (1<<4)) != 0;
uint8_t cbitpos = ebx & 0x3f;
uint8_t reduced_phys_bits = (ebx >> 6) & 0x3f;
res->cbitpos = ebx & 0x3f;
res->reduced_phys_bits = (ebx >> 6) & 0x3f;
}
int main() {
cpu_caps_t caps;
query_cpu_capabilities(&caps);
const char *path = "/run/qemu-server/";
// Check that the directory exists and create it if it does not.
@ -60,11 +74,11 @@ int main() {
" \"sev-support-snp\": %s"
" }"
" }\n",
cbitpos,
reduced_phys_bits,
sev_support ? "true" : "false",
sev_es_support ? "true" : "false",
sev_snp_support ? "true" : "false"
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) {
printf("Error writing to file %s: %s\n", path, strerror(errno));