git: 582e01321ac6 - stable/15 - bhyve: tpm: Avoid printing a message when clearing the cancel bit

The branch stable/15 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=582e01321ac6204f3560674c290a58ed89de39f5

commit 582e01321ac6204f3560674c290a58ed89de39f5
Author:     Mark Johnston <[email protected]>
AuthorDate: 2026-07-31 14:22:46 +0000
Commit:     Mark Johnston <[email protected]>
CommitDate: 2026-08-17 12:07:41 +0000

    bhyve: tpm: Avoid printing a message when clearing the cancel bit
    
    Some drivers do this routinely, e.g., FreeBSD's tpm20 does this every
    time it sends a command in tpmcrb_transmit().  This causes the console
    to fill up with messages.  Instead, only print a warning if the cancel
    bit is set to one.
    
    Reviewed by:    corvink
    MFC after:      2 weeks
    Differential Revision:  https://reviews.freebsd.org/D52425
    
    (cherry picked from commit 1c1a3646a1c86624e67a42636894fd1685386cf1)
---
 usr.sbin/bhyve/tpm_intf_crb.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/usr.sbin/bhyve/tpm_intf_crb.c b/usr.sbin/bhyve/tpm_intf_crb.c
index 9b44d1d133b0..bf5602a87659 100644
--- a/usr.sbin/bhyve/tpm_intf_crb.c
+++ b/usr.sbin/bhyve/tpm_intf_crb.c
@@ -371,11 +371,18 @@ tpm_crb_mem_handler(struct vcpu *vcpu __unused, const int dir,
 			break;
 		}
 		case offsetof(struct tpm_crb_regs, ctrl_cancel): {
-			/* TODO: cancel the tpm command */
-			warnx(
-			    "%s: cancelling a TPM command is not implemented yet",
-			    __func__);
+			union tpm_crb_reg_ctrl_cancel cancel;
+
+			if ((size_t)size > sizeof(cancel))
+				goto err_out;
 
+			tpm_crb_mmiocpy(&cancel, val, size);
+			if (cancel.cancel != 0) {
+				/* TODO: cancel the tpm command */
+				warnx(
+		    "%s: cancelling a TPM command is not implemented yet",
+				    __func__);
+			}
 			break;
 		}
 		case offsetof(struct tpm_crb_regs, int_enable):