Libvirt can use qmp_query_sgx_capabilities() to get the host
sgx capabilities.
Signed-off-by: Yang Zhong <yang.zh...@intel.com>
v1-->v2:
- Changed the blurb error and "Since: 5.1" to "Since: 6.1"(Eric Blake).
---
hw/i386/sgx.c | 66 ++++++++++++++++++++++++++++++++++++++
include/hw/i386/pc.h | 1 +
monitor/qmp-cmds.c | 5 +++
qapi/misc.json | 19 +++++++++++
stubs/sgx-stub.c | 5 +++
tests/qtest/qmp-cmd-test.c | 1 +
6 files changed, 97 insertions(+)
diff --git a/hw/i386/sgx.c b/hw/i386/sgx.c
index cbc8da94cc..bd0587a376 100644
--- a/hw/i386/sgx.c
+++ b/hw/i386/sgx.c
@@ -17,6 +17,72 @@
#include "monitor/qdev.h"
#include "qapi/error.h"
#include "exec/address-spaces.h"
+#include "sysemu/hw_accel.h"
+
+#define SGX_MAX_EPC_SECTIONS 8
+#define SGX_CPUID_EPC_INVALID 0x0
+
+/* A valid EPC section. */
+#define SGX_CPUID_EPC_SECTION 0x1
+#define SGX_CPUID_EPC_MASK GENMASK(3, 0)
+
+static uint64_t sgx_calc_section_metric(uint64_t low, uint64_t high)
+{
+ return (low & GENMASK_ULL(31, 12)) +
+ ((high & GENMASK_ULL(19, 0)) << 32);
+}
+
+static uint64_t sgx_calc_host_epc_section_size(void)
+{
+ uint32_t i, type;
+ uint32_t eax, ebx, ecx, edx;
+ uint64_t size = 0;
+
+ for (i = 0; i < SGX_MAX_EPC_SECTIONS; i++) {
+ host_cpuid(0x12, i + 2, &eax, &ebx, &ecx, &edx);
+
+ type = eax & SGX_CPUID_EPC_MASK;
+ if (type == SGX_CPUID_EPC_INVALID) {
+ break;
+ }
+
+ if (type != SGX_CPUID_EPC_SECTION) {
+ break;
+ }
+
+ size += sgx_calc_section_metric(ecx, edx);
+ }
+
+ return size;
+}
+
+SGXInfo *sgx_get_capabilities(Error **errp)
+{
+ SGXInfo *info = NULL;
+ uint32_t eax, ebx, ecx, edx;
+
+ int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
+ if (fd < 0) {
+ error_setg(errp, "SGX is not enabled in KVM");
+ return NULL;
+ }
+
+ info = g_new0(SGXInfo, 1);
+ host_cpuid(0x7, 0, &eax, &ebx, &ecx, &edx);
+
+ info->sgx = ebx & (1U << 2) ? true : false;
+ info->flc = ecx & (1U << 30) ? true : false;
+
+ host_cpuid(0x12, 0, &eax, &ebx, &ecx, &edx);
+ info->sgx1 = eax & (1U << 0) ? true : false;
+ info->sgx2 = eax & (1U << 1) ? true : false;
+
+ info->section_size = sgx_calc_host_epc_section_size();
+
+ close(fd);
+
+ return info;
+}
SGXInfo *sgx_get_info(void)
{
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 2dba83aee2..7e595a0431 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -205,6 +205,7 @@ void pc_machine_init_sgx_epc(PCMachineState *pcms);
void sgx_memory_backend_reset(HostMemoryBackend *backend, int fd,
Error **errp);
SGXInfo *sgx_get_info(void);
+SGXInfo *sgx_get_capabilities(Error **errp);
extern GlobalProperty pc_compat_5_2[];
extern const size_t pc_compat_5_2_len;
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index 48f7708ffe..f1360e9f4e 100644
--- a/monitor/qmp-cmds.c
+++ b/monitor/qmp-cmds.c
@@ -365,3 +365,8 @@ SGXInfo *qmp_query_sgx(Error **errp)
return info;
}
+
+SGXInfo *qmp_query_sgx_capabilities(Error **errp)
+{
+ return sgx_get_capabilities(errp);
+}
diff --git a/qapi/misc.json b/qapi/misc.json
index 83b45a1460..8d1a78d138 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -561,3 +561,22 @@
#
##
{ 'command': 'query-sgx', 'returns': 'SGXInfo' }
+
+
+##
+# @query-sgx-capabilities:
+#
+# Returns information from host SGX capabilities
+#
+# Returns: @SGXInfo
+#
+# Since: 6.1
+#
+# Example:
+#
+# -> { "execute": "query-sgx-capabilities" }
+# <- { "return": { "sgx": true, "sgx1" : true, "sgx2" : true,
+# "flc": true, "section-size" : 0 } }
+#
+##
+{ 'command': 'query-sgx-capabilities', 'returns': 'SGXInfo' }
diff --git a/stubs/sgx-stub.c b/stubs/sgx-stub.c
index c2b59a88fd..1dedf3f3db 100644
--- a/stubs/sgx-stub.c
+++ b/stubs/sgx-stub.c
@@ -5,3 +5,8 @@ SGXInfo *sgx_get_info(void)
{
return NULL;
}
+
+SGXInfo *sgx_get_capabilities(Error **errp)
+{
+ return NULL;
+}
diff --git a/tests/qtest/qmp-cmd-test.c b/tests/qtest/qmp-cmd-test.c
index b75f3364f3..1af2f74c28 100644
--- a/tests/qtest/qmp-cmd-test.c
+++ b/tests/qtest/qmp-cmd-test.c
@@ -101,6 +101,7 @@ static bool query_is_ignored(const char *cmd)
"query-sev",
"query-sev-capabilities",
"query-sgx",
+ "query-sgx-capabilities",
NULL
};
int i;
--
2.29.2.334.gfaefdd61ec
