git: ee3a7907bb98 - stable/13 - bhyve: add helper to read PCI IDs from bhyve config

The branch stable/13 has been updated by corvink:

URL: https://cgit.FreeBSD.org/src/commit/?id=ee3a7907bb987b104246efd149c4af251e7bc402

commit ee3a7907bb987b104246efd149c4af251e7bc402
Author:     Corvin Köhne <corvink@FreeBSD.org>
AuthorDate: 2023-02-06 10:43:49 +0000
Commit:     Corvin Köhne <corvink@FreeBSD.org>
CommitDate: 2023-04-05 10:00:39 +0000

    bhyve: add helper to read PCI IDs from bhyve config
    
    Changing the PCI IDs is valuable in some situations. The Intel GOP
    driver requires that some PCI IDs of the LPC bridge are aligned with the
    physical values of the host LPC bridge. Another use case are oracles
    virtio driver. They require different subvendor ID than the default one.
    For that reason, create a helper which makes it easy to read PCI IDs
    from bhyve config. Additionally, this helper ensures that all emulation
    devices are using the same config keys.
    
    Reviewed by:            jhb
    MFC after:              1 week
    Sponsored by:           Beckhoff Automation GmbH & Co. KG
    Differential Revision:  https://reviews.freebsd.org/D38402
    
    (cherry picked from commit ffaed739a80319a56d0b1dfd6cedeb3d194ff42c)
---
 usr.sbin/bhyve/pci_emul.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 usr.sbin/bhyve/pci_emul.h |  3 +++
 2 files changed, 47 insertions(+)

diff --git a/usr.sbin/bhyve/pci_emul.c b/usr.sbin/bhyve/pci_emul.c
index 93411751d635..41b7718e6935 100644
--- a/usr.sbin/bhyve/pci_emul.c
+++ b/usr.sbin/bhyve/pci_emul.c
@@ -61,6 +61,7 @@ __FBSDID("$FreeBSD$");
 #include "pci_emul.h"
 #include "pci_irq.h"
 #include "pci_lpc.h"
+#include "pci_passthru.h"
 
 #define CONF1_ADDR_PORT	   0x0cf8
 #define CONF1_DATA_PORT	   0x0cfc
@@ -332,6 +333,49 @@ pci_print_supported_devices(void)
 	}
 }
 
+uint32_t
+pci_config_read_reg(const struct pcisel *const host_sel, nvlist_t *nvl,
+    const uint32_t reg, const uint8_t size, const uint32_t def)
+{
+	const char *config;
+	const nvlist_t *pci_regs;
+
+	assert(size == 1 || size == 2 || size == 4);
+
+	pci_regs = find_relative_config_node(nvl, "pcireg");
+	if (pci_regs == NULL) {
+		return def;
+	}
+
+	switch (reg) {
+	case PCIR_DEVICE:
+		config = get_config_value_node(pci_regs, "device");
+		break;
+	case PCIR_VENDOR:
+		config = get_config_value_node(pci_regs, "vendor");
+		break;
+	case PCIR_REVID:
+		config = get_config_value_node(pci_regs, "revid");
+		break;
+	case PCIR_SUBVEND_0:
+		config = get_config_value_node(pci_regs, "subvendor");
+		break;
+	case PCIR_SUBDEV_0:
+		config = get_config_value_node(pci_regs, "subdevice");
+		break;
+	default:
+		return (-1);
+	}
+
+	if (config == NULL) {
+		return def;
+	} else if (host_sel != NULL && strcmp(config, "host") == 0) {
+		return read_config(host_sel, reg, size);
+	} else {
+		return strtol(config, NULL, 16);
+	}
+}
+
 static int
 pci_valid_pba_offset(struct pci_devinst *pi, uint64_t offset)
 {
diff --git a/usr.sbin/bhyve/pci_emul.h b/usr.sbin/bhyve/pci_emul.h
index 117fc78898a2..40487b18f87b 100644
--- a/usr.sbin/bhyve/pci_emul.h
+++ b/usr.sbin/bhyve/pci_emul.h
@@ -35,6 +35,7 @@
 #include <sys/queue.h>
 #include <sys/kernel.h>
 #include <sys/nv.h>
+#include <sys/pciio.h>
 #include <sys/_pthreadtypes.h>
 
 #include <dev/pci/pcireg.h>
@@ -227,6 +228,8 @@ typedef void (*pci_lintr_cb)(int b, int s, int pin, int pirq_pin,
 
 int	init_pci(struct vmctx *ctx);
 void	pci_callback(void);
+uint32_t pci_config_read_reg(const struct pcisel *host_sel, nvlist_t *nvl,
+	    uint32_t reg, uint8_t size, uint32_t def);
 int	pci_emul_alloc_bar(struct pci_devinst *pdi, int idx,
 	    enum pcibar_type type, uint64_t size);
 int 	pci_emul_alloc_rom(struct pci_devinst *const pdi, const uint64_t size,