[RFC PATCH 04/21] xen-platform-pci: allow its creation with XEN_EMULATE mode

[David Woodhouse <dwmw2@infradead.org>]

From: Joao Martins <joao.m.martins@oracle.com>

The only thing we need to handle on KVM side is to change the
pfn from R/W to R/O.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 hw/i386/xen/xen_platform.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/hw/i386/xen/xen_platform.c b/hw/i386/xen/xen_platform.c
index a64265cca0..914619d140 100644
--- a/hw/i386/xen/xen_platform.c
+++ b/hw/i386/xen/xen_platform.c
@@ -271,7 +271,10 @@ static void platform_fixed_ioport_writeb(void *opaque, uint32_t addr, uint32_t v
     case 0: /* Platform flags */ {
         hvmmem_type_t mem_type = (val & PFFLAG_ROM_LOCK) ?
             HVMMEM_ram_ro : HVMMEM_ram_rw;
-        if (xen_set_mem_type(xen_domid, mem_type, 0xc0, 0x40)) {
+        if (xen_mode == XEN_EMULATE) {
+            /* XXX */
+            s->flags = val & PFFLAG_ROM_LOCK;
+        } else if (xen_set_mem_type(xen_domid, mem_type, 0xc0, 0x40)) {
             DPRINTF("unable to change ro/rw state of ROM memory area!\n");
         } else {
             s->flags = val & PFFLAG_ROM_LOCK;
@@ -496,12 +499,6 @@ static void xen_platform_realize(PCIDevice *dev, Error **errp)
     PCIXenPlatformState *d = XEN_PLATFORM(dev);
     uint8_t *pci_conf;
 
-    /* Device will crash on reset if xen is not initialized */
-    if (!xen_enabled()) {
-        error_setg(errp, "xen-platform device requires the Xen accelerator");
-        return;
-    }
-
     pci_conf = dev->config;
 
     pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
-- 
2.35.3