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MdePkg: Avoid hardcoded value for number of Page State Change entries

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654

The SNP_PAGE_STATE_MAX_ENTRY is based on the number of entries that can
fit in the GHCB shared buffer. As a result, the SNP_PAGE_STATE_CHANGE_INFO
structure maps the full GHCB shared buffer based on the shared buffer size
being 2032 bytes.

Instead of using a hardcoded value for SNP_PAGE_STATE_MAX_ENTRY, use a
build calculated value. Since the SNP_PAGE_STATE_CHANGE_INFO is used as a
mapping, eliminate the hardcoded array size so that the structure can be
used based on any size buffer.

Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Tom Lendacky 2024-03-08 07:30:56 -08:00 committed by mergify[bot]
parent 5fe9db0f82
commit f40c1f2a30
1 changed files with 4 additions and 3 deletions
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7
MdePkg/Include/Register/Amd/Ghcb.h
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@ -197,13 +197,14 @@ typedef struct {
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_ENTRY Entry[];
} SNP_PAGE_STATE_CHANGE_INFO;
#define SNP_PAGE_STATE_MAX_ENTRY \
((sizeof (((GHCB *)0)->SharedBuffer) - sizeof (SNP_PAGE_STATE_HEADER)) / sizeof (SNP_PAGE_STATE_ENTRY))
//
// Get APIC IDs
//