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Code Issues Releases Activity

bhyve: don't crash when guest writes TPM int_enable register

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FreeBSD's own TPM driver writes 0 to the INT_ENABLE register during
attach, making sure interrupts are off. bhyve really shouldn't kill the
VM when that happens just because it doesn't support TPM interrupts.
Even if a guest was trying to enable interrupts, we should just ignore
it like real TPM hardware would.

Reviewed by:		corvink
MFC after:		1 week
Differential Revision:	https://reviews.freebsd.org/D46562
This commit is contained in:
Hans Rosenfeld 2024-09-09 10:41:31 +02:00 committed by Corvin Köhne
parent d1d839d0b5
commit 2feea221b2
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1 changed files with 4 additions and 0 deletions
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4
usr.sbin/bhyve/tpm_intf_crb.c
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@ -337,6 +337,10 @@ tpm_crb_mem_handler(struct vcpu *vcpu __unused, const int dir,
break;
}
case offsetof(struct tpm_crb_regs, int_enable):
/* No interrupt support. Ignore writes to int_enable. */
break;
case offsetof(struct tpm_crb_regs, ctrl_start): {
union tpm_crb_reg_ctrl_start start;