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bhyve: add emulation for qemu's fwcfg data port

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The data port returns the data of the fwcfg item.

Reviewed by:		markj
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D38333
This commit is contained in:
Corvin Köhne 2021-08-11 10:00:34 +02:00
parent 151d8131a8
commit b11081dca7
No known key found for this signature in database
GPG key ID: D854DA56315E026A
2 changed files with 48 additions and 0 deletions
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40
usr.sbin/bhyve/qemu_fwcfg.c
View file

@ -56,6 +56,8 @@ struct qemu_fwcfg_softc {
uint32_t data_offset;
union qemu_fwcfg_selector selector;
struct qemu_fwcfg_item items[QEMU_FWCFG_MAX_ARCHS]
[QEMU_FWCFG_MAX_ENTRIES];
};
static struct qemu_fwcfg_softc fwcfg_sc;
@ -87,6 +89,44 @@ qemu_fwcfg_data_port_handler(struct vmctx *const ctx __unused, const int in,
const int port __unused, const int bytes, uint32_t *const eax,
void *const arg __unused)
{
if (bytes != sizeof(uint8_t)) {
warnx("%s: invalid size (%d) of IO port access", __func__,
bytes);
return (-1);
}
if (!in) {
warnx("%s: Writes to qemu fwcfg data port aren't allowed",
__func__);
return (-1);
}
/* get fwcfg item */
struct qemu_fwcfg_item *const item =
&fwcfg_sc.items[fwcfg_sc.selector.architecture]
[fwcfg_sc.selector.index];
if (item->data == NULL) {
warnx(
"%s: qemu fwcfg item doesn't exist (architecture %s index 0x%x)",
__func__,
fwcfg_sc.selector.architecture ? "specific" : "generic",
fwcfg_sc.selector.index);
*eax = 0x00;
return (0);
} else if (fwcfg_sc.data_offset >= item->size) {
warnx(
"%s: qemu fwcfg item read exceeds size (architecture %s index 0x%x size 0x%x offset 0x%x)",
__func__,
fwcfg_sc.selector.architecture ? "specific" : "generic",
fwcfg_sc.selector.index, item->size, fwcfg_sc.data_offset);
*eax = 0x00;
return (0);
}
/* return item data */
*eax = item->data[fwcfg_sc.data_offset];
fwcfg_sc.data_offset++;
return (0);
}

8
usr.sbin/bhyve/qemu_fwcfg.h
View file

@ -9,4 +9,12 @@
#include <vmmapi.h>
#define QEMU_FWCFG_MAX_ARCHS 0x2
#define QEMU_FWCFG_MAX_ENTRIES 0x4000
struct qemu_fwcfg_item {
uint32_t size;
uint8_t *data;
};
int qemu_fwcfg_init(struct vmctx *const ctx);