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| author | Corvin Köhne <corvink@FreeBSD.org> | 2021-08-11 08:00:34 +0000 |
|---|---|---|
| committer | Corvin Köhne <corvink@FreeBSD.org> | 2023-02-14 07:28:49 +0000 |
| commit | b11081dca76b8e283495632b86b41539ee013857 (patch) | |
| tree | c941d02f5bb570aa55be38a243b530c68e34d2e8 | |
| parent | 151d8131a817e7a6a629e9bb7fde4d7a158e5211 (diff) | |
| download | src-b11081dca76b8e283495632b86b41539ee013857.tar.gz src-b11081dca76b8e283495632b86b41539ee013857.zip | |
bhyve: add emulation for qemu's fwcfg data port
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
| -rw-r--r-- | usr.sbin/bhyve/qemu_fwcfg.c | 40 | ||||
| -rw-r--r-- | usr.sbin/bhyve/qemu_fwcfg.h | 8 |
2 files changed, 48 insertions, 0 deletions
diff --git a/usr.sbin/bhyve/qemu_fwcfg.c b/usr.sbin/bhyve/qemu_fwcfg.c index dec3fa83c493..13e21daca7ff 100644 --- a/usr.sbin/bhyve/qemu_fwcfg.c +++ b/usr.sbin/bhyve/qemu_fwcfg.c @@ -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); } diff --git a/usr.sbin/bhyve/qemu_fwcfg.h b/usr.sbin/bhyve/qemu_fwcfg.h index 26c4db0ff71e..58ef5ed3c6bf 100644 --- a/usr.sbin/bhyve/qemu_fwcfg.h +++ b/usr.sbin/bhyve/qemu_fwcfg.h @@ -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); |