BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275
The Page State Change NAE exit will be used by the SEV-SNP guest to
request a page state change using the GHCB protocol. See the GHCB
spec section 4.1.6 and 2.3.1 for more detail on the structure
definitions.
Cc: James Bottomley <j...@linux.ibm.com>
Cc: Min Xu <min.m...@intel.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Laszlo Ersek <ler...@redhat.com>
Cc: Erdem Aktas <erdemak...@google.com>
Cc: Michael D Kinney <michael.d.kin...@intel.com>
Cc: Liming Gao <gaolim...@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang....@intel.com>
Reviewed-by: Laszlo Ersek <ler...@redhat.com>
Reviewed-by: Liming Gao <gaolim...@byosoft.com.cn>
Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
---
MdePkg/Include/Register/Amd/Fam17Msr.h | 15 ++++++++++++
MdePkg/Include/Register/Amd/Ghcb.h | 33 ++++++++++++++++++++++++++
2 files changed, 48 insertions(+)
diff --git a/MdePkg/Include/Register/Amd/Fam17Msr.h
b/MdePkg/Include/Register/Amd/Fam17Msr.h
index 542e4cdf4782..62014854d9b7 100644
--- a/MdePkg/Include/Register/Amd/Fam17Msr.h
+++ b/MdePkg/Include/Register/Amd/Fam17Msr.h
@@ -58,6 +58,19 @@ typedef union {
UINT64 GuestFrameNumber:52;
} GhcbGpaRegister;
+ struct {
+ UINT64 Function:12;
+ UINT64 GuestFrameNumber:40;
+ UINT64 Operation:4;
+ UINT64 Reserved:8;
+ } SnpPageStateChangeRequest;
+
+ struct {
+ UINT32 Function:12;
+ UINT32 Reserved:20;
+ UINT32 ErrorCode;
+ } SnpPageStateChangeResponse;
+
VOID *Ghcb;
UINT64 GhcbPhysicalAddress;
@@ -69,6 +82,8 @@ typedef union {
#define GHCB_INFO_CPUID_RESPONSE 5
#define GHCB_INFO_GHCB_GPA_REGISTER_REQUEST 18
#define GHCB_INFO_GHCB_GPA_REGISTER_RESPONSE 19
+#define GHCB_INFO_SNP_PAGE_STATE_CHANGE_REQUEST 20
+#define GHCB_INFO_SNP_PAGE_STATE_CHANGE_RESPONSE 21
#define GHCB_HYPERVISOR_FEATURES_REQUEST 128
#define GHCB_HYPERVISOR_FEATURES_RESPONSE 129
#define GHCB_INFO_TERMINATE_REQUEST 256
diff --git a/MdePkg/Include/Register/Amd/Ghcb.h
b/MdePkg/Include/Register/Amd/Ghcb.h
index ec232ebd3807..029904b1c63a 100644
--- a/MdePkg/Include/Register/Amd/Ghcb.h
+++ b/MdePkg/Include/Register/Amd/Ghcb.h
@@ -54,6 +54,7 @@
#define SVM_EXIT_NMI_COMPLETE 0x80000003ULL
#define SVM_EXIT_AP_RESET_HOLD 0x80000004ULL
#define SVM_EXIT_AP_JUMP_TABLE 0x80000005ULL
+#define SVM_EXIT_SNP_PAGE_STATE_CHANGE 0x80000010ULL
#define SVM_EXIT_HYPERVISOR_FEATURES 0x8000FFFDULL
#define SVM_EXIT_UNSUPPORTED 0x8000FFFFULL
@@ -162,4 +163,36 @@ typedef union {
#define GHCB_HV_FEATURES_SNP_AP_CREATE
(GHCB_HV_FEATURES_SNP | BIT1)
#define GHCB_HV_FEATURES_SNP_RESTRICTED_INJECTION
(GHCB_HV_FEATURES_SNP_AP_CREATE | BIT2)
#define GHCB_HV_FEATURES_SNP_RESTRICTED_INJECTION_TIMER
(GHCB_HV_FEATURES_SNP_RESTRICTED_INJECTION | BIT3)
+
+//
+// SNP Page State Change.
+//
+// Note that the PSMASH and UNSMASH operations are not supported when using
the MSR protocol.
+//
+#define SNP_PAGE_STATE_PRIVATE 1
+#define SNP_PAGE_STATE_SHARED 2
+#define SNP_PAGE_STATE_PSMASH 3
+#define SNP_PAGE_STATE_UNSMASH 4
+
+typedef struct {
+ UINT64 CurrentPage:12;
+ UINT64 GuestFrameNumber:40;
+ UINT64 Operation:4;
+ UINT64 PageSize:1;
+ UINT64 Reserved:7;
+} SNP_PAGE_STATE_ENTRY;
+
+typedef struct {
+ UINT16 CurrentEntry;
+ UINT16 EndEntry;
+ UINT32 Reserved;
+} SNP_PAGE_STATE_HEADER;
+
+#define SNP_PAGE_STATE_MAX_ENTRY 253
+
+typedef struct {
+ SNP_PAGE_STATE_HEADER Header;
+ SNP_PAGE_STATE_ENTRY Entry[SNP_PAGE_STATE_MAX_ENTRY];
+} SNP_PAGE_STATE_CHANGE_INFO;
+
#endif
--
2.17.1
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