[PATCH v19 003/130] x86/virt/tdx: Unbind global metadata read with 'struct tdx_tdmr_sysinfo'

isaku.yamahata
2024-02-26T08:27:37Z

From: Kai Huang <kai.huang@intel.com>

For now the kernel only reads TDMR related global metadata fields for
module initialization, and the metadata read code only works with the
'struct tdx_tdmr_sysinfo'.

KVM will need to read a bunch of non-TDMR related metadata to create and
run TDX guests. It's essential to provide a generic metadata read
infrastructure which is not bound to any specific structure.

To start providing such infrastructure, unbound the metadata read with
the 'struct tdx_tdmr_sysinfo'.

Signed-off-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/virt/vmx/tdx/tdx.c | 25 ++++++++++++++-----------
1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index cdcb3332bc5d..eb208da4ff63 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -273,9 +273,9 @@ static int read_sys_metadata_field(u64 field_id, u64 *data)

static int read_sys_metadata_field16(u64 field_id,
int offset,
- struct tdx_tdmr_sysinfo *ts)
+ void *stbuf)
{
- u16 *ts_member = ((void *)ts) + offset;
+ u16 *st_member = stbuf + offset;
u64 tmp;
int ret;

@@ -287,7 +287,7 @@ static int read_sys_metadata_field16(u64 field_id,
if (ret)
return ret;

- *ts_member = tmp;
+ *st_member = tmp;

return 0;
}
@@ -297,19 +297,22 @@ struct field_mapping {
int offset;
};

-#define TD_SYSINFO_MAP(_field_id, _member) \
- { .field_id = MD_FIELD_ID_##_field_id, \
- .offset = offsetof(struct tdx_tdmr_sysinfo, _member) }
+#define TD_SYSINFO_MAP(_field_id, _struct, _member) \
+ { .field_id = MD_FIELD_ID_##_field_id, \
+ .offset = offsetof(_struct, _member) }
+
+#define TD_SYSINFO_MAP_TDMR_INFO(_field_id, _member) \
+ TD_SYSINFO_MAP(_field_id, struct tdx_tdmr_sysinfo, _member)

static int get_tdx_tdmr_sysinfo(struct tdx_tdmr_sysinfo *tdmr_sysinfo)
{
/* Map TD_SYSINFO fields into 'struct tdx_tdmr_sysinfo': */
const struct field_mapping fields[] = {
- TD_SYSINFO_MAP(MAX_TDMRS, max_tdmrs),
- TD_SYSINFO_MAP(MAX_RESERVED_PER_TDMR, max_reserved_per_tdmr),
- TD_SYSINFO_MAP(PAMT_4K_ENTRY_SIZE, pamt_entry_size[TDX_PS_4K]),
- TD_SYSINFO_MAP(PAMT_2M_ENTRY_SIZE, pamt_entry_size[TDX_PS_2M]),
- TD_SYSINFO_MAP(PAMT_1G_ENTRY_SIZE, pamt_entry_size[TDX_PS_1G]),
+ TD_SYSINFO_MAP_TDMR_INFO(MAX_TDMRS, max_tdmrs),
+ TD_SYSINFO_MAP_TDMR_INFO(MAX_RESERVED_PER_TDMR, max_reserved_per_tdmr),
+ TD_SYSINFO_MAP_TDMR_INFO(PAMT_4K_ENTRY_SIZE, pamt_entry_size[TDX_PS_4K]),
+ TD_SYSINFO_MAP_TDMR_INFO(PAMT_2M_ENTRY_SIZE, pamt_entry_size[TDX_PS_2M]),
+ TD_SYSINFO_MAP_TDMR_INFO(PAMT_1G_ENTRY_SIZE, pamt_entry_size[TDX_PS_1G]),
};
int ret;
int i;
--
2.25.1