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bhyve: Remove special no-op handling for I/O port 0x488

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This appears to have been reserved for some kind of debug hook, but it's
not implemented and appears never to have been used.

Reviewed by:	corvink, jhb
MFC after:	1 week
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D40555
This commit is contained in:
Mark Johnston 2023-06-15 12:12:25 -04:00
parent 6281147a96
commit e1390215af
1 changed files with 1 additions and 22 deletions
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23
usr.sbin/bhyve/bhyverun.c
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@ -112,8 +112,6 @@ __FBSDID("$FreeBSD$");
#include "rtc.h"
#include "vmgenc.h"
#define GUEST_NIO_PORT 0x488 /* guest upcalls via i/o port */
#define MB (1024UL * 1024)
#define GB (1024UL * MB)
@ -564,36 +562,17 @@ fbsdrun_deletecpu(int vcpu)
return (CPU_EMPTY(&cpumask));
}
static int
vmexit_handle_notify(struct vmctx *ctx __unused, struct vcpu *vcpu __unused,
struct vm_exit *vme __unused, uint32_t eax __unused)
{
#if BHYVE_DEBUG
/*
* put guest-driven debug here
*/
#endif
return (VMEXIT_CONTINUE);
}
static int
vmexit_inout(struct vmctx *ctx, struct vcpu *vcpu, struct vm_run *vmrun)
{
struct vm_exit *vme;
int error;
int bytes, port, in, out;
int bytes, port, in;
vme = vmrun->vm_exit;
port = vme->u.inout.port;
bytes = vme->u.inout.bytes;
in = vme->u.inout.in;
out = !in;
/* Extra-special case of host notifications */
if (out && port == GUEST_NIO_PORT) {
error = vmexit_handle_notify(ctx, vcpu, vme, vme->u.inout.eax);
return (error);
}
error = emulate_inout(ctx, vcpu, vme);
if (error) {