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KVM: TDX: Report supported optional TDVMCALLs in TDX capabilities

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Allow userspace to advertise TDG.VP.VMCALL subfunctions that the
kernel also supports.  For each output register of GetTdVmCallInfo's
leaf 1, add two fields to KVM_TDX_CAPABILITIES: one for kernel-supported
TDVMCALLs (userspace can set those blindly) and one for user-supported
TDVMCALLs (userspace can set those if it knows how to handle them).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2025-06-20 14:20:20 -04:00
parent 4580dbef5c
commit 28224ef02b
3 changed files with 28 additions and 2 deletions
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15
Documentation/virt/kvm/x86/intel-tdx.rst
View file

@ -79,7 +79,20 @@ to be configured to the TDX guest.
struct kvm_tdx_capabilities {
__u64 supported_attrs;
__u64 supported_xfam;
__u64 reserved[254];
/* TDG.VP.VMCALL hypercalls executed in kernel and forwarded to
* userspace, respectively
*/
__u64 kernel_tdvmcallinfo_1_r11;
__u64 user_tdvmcallinfo_1_r11;
/* TDG.VP.VMCALL instruction executions subfunctions executed in kernel
* and forwarded to userspace, respectively
*/
__u64 kernel_tdvmcallinfo_1_r12;
__u64 user_tdvmcallinfo_1_r12;
__u64 reserved[250];
/* Configurable CPUID bits for userspace */
struct kvm_cpuid2 cpuid;

8
arch/x86/include/uapi/asm/kvm.h
View file

@ -965,7 +965,13 @@ struct kvm_tdx_cmd {
struct kvm_tdx_capabilities {
__u64 supported_attrs;
__u64 supported_xfam;
__u64 reserved[254];
__u64 kernel_tdvmcallinfo_1_r11;
__u64 user_tdvmcallinfo_1_r11;
__u64 kernel_tdvmcallinfo_1_r12;
__u64 user_tdvmcallinfo_1_r12;
__u64 reserved[250];
/* Configurable CPUID bits for userspace */
struct kvm_cpuid2 cpuid;

7
arch/x86/kvm/vmx/tdx.c
View file

@ -173,6 +173,9 @@ static void td_init_cpuid_entry2(struct kvm_cpuid_entry2 *entry, unsigned char i
tdx_clear_unsupported_cpuid(entry);
}
#define TDVMCALLINFO_GET_QUOTE BIT(0)
#define TDVMCALLINFO_SETUP_EVENT_NOTIFY_INTERRUPT BIT(1)
static int init_kvm_tdx_caps(const struct tdx_sys_info_td_conf *td_conf,
struct kvm_tdx_capabilities *caps)
{
@ -188,6 +191,10 @@ static int init_kvm_tdx_caps(const struct tdx_sys_info_td_conf *td_conf,
caps->cpuid.nent = td_conf->num_cpuid_config;
caps->user_tdvmcallinfo_1_r11 =
TDVMCALLINFO_GET_QUOTE |
TDVMCALLINFO_SETUP_EVENT_NOTIFY_INTERRUPT;
for (i = 0; i < td_conf->num_cpuid_config; i++)
td_init_cpuid_entry2(&caps->cpuid.entries[i], i);