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x86/tdx: tdx_mcall_get_report0: Return -EBUSY on TDCALL_OPERAND_BUSY error

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Return `-EBUSY` from tdx_mcall_get_report0() when `TDG.MR.REPORT` returns
`TDCALL_OPERAND_BUSY`. This enables the caller to retry obtaining a
TDREPORT later if another VCPU is extending an RTMR concurrently.

Signed-off-by: Cedric Xing <cedric.xing@intel.com>
Acked-by: Dionna Amalie Glaze <dionnaglaze@google.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://patch.msgid.link/20250506-tdx-rtmr-v6-4-ac6ff5e9d58a@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Cedric Xing 2025-05-06 17:57:10 -05:00 committed by Dan Williams
parent 3f88ca9614
commit 2748566da8
1 changed files with 8 additions and 5 deletions
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13
arch/x86/coco/tdx/tdx.c
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@ -110,12 +110,13 @@ static inline u64 tdg_vm_wr(u64 field, u64 value, u64 mask)
* REPORTDATA to be included into TDREPORT.
* @tdreport: Address of the output buffer to store TDREPORT.
*
* Refer to section titled "TDG.MR.REPORT leaf" in the TDX Module
* v1.0 specification for more information on TDG.MR.REPORT TDCALL.
* Refer to section titled "TDG.MR.REPORT leaf" in the TDX Module v1.0
* specification for more information on TDG.MR.REPORT TDCALL.
*
* It is used in the TDX guest driver module to get the TDREPORT0.
*
* Return 0 on success, -EINVAL for invalid operands, or -EIO on
* other TDCALL failures.
* Return 0 on success, -ENXIO for invalid operands, -EBUSY for busy operation,
* or -EIO on other TDCALL failures.
*/
int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport)
{
@ -129,7 +130,9 @@ int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport)
ret = __tdcall(TDG_MR_REPORT, &args);
if (ret) {
if (TDCALL_RETURN_CODE(ret) == TDCALL_INVALID_OPERAND)
return -EINVAL;
return -ENXIO;
else if (TDCALL_RETURN_CODE(ret) == TDCALL_OPERAND_BUSY)
return -EBUSY;
return -EIO;
}