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-rw-r--r--arch/i386/kernel/paravirt.c35
-rw-r--r--include/asm-i386/paravirt.h1
2 files changed, 36 insertions, 0 deletions
diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c
index faab09abca5e..60e08b9b50a4 100644
--- a/arch/i386/kernel/paravirt.c
+++ b/arch/i386/kernel/paravirt.c
@@ -228,6 +228,41 @@ static int __init print_banner(void)
228} 228}
229core_initcall(print_banner); 229core_initcall(print_banner);
230 230
231static struct resource reserve_ioports = {
232 .start = 0,
233 .end = IO_SPACE_LIMIT,
234 .name = "paravirt-ioport",
235 .flags = IORESOURCE_IO | IORESOURCE_BUSY,
236};
237
238static struct resource reserve_iomem = {
239 .start = 0,
240 .end = -1,
241 .name = "paravirt-iomem",
242 .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
243};
244
245/*
246 * Reserve the whole legacy IO space to prevent any legacy drivers
247 * from wasting time probing for their hardware. This is a fairly
248 * brute-force approach to disabling all non-virtual drivers.
249 *
250 * Note that this must be called very early to have any effect.
251 */
252int paravirt_disable_iospace(void)
253{
254 int ret;
255
256 ret = request_resource(&ioport_resource, &reserve_ioports);
257 if (ret == 0) {
258 ret = request_resource(&iomem_resource, &reserve_iomem);
259 if (ret)
260 release_resource(&reserve_ioports);
261 }
262
263 return ret;
264}
265
231struct paravirt_ops paravirt_ops = { 266struct paravirt_ops paravirt_ops = {
232 .name = "bare hardware", 267 .name = "bare hardware",
233 .paravirt_enabled = 0, 268 .paravirt_enabled = 0,
diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
index 786856950b1a..690ada22437a 100644
--- a/include/asm-i386/paravirt.h
+++ b/include/asm-i386/paravirt.h
@@ -262,6 +262,7 @@ unsigned paravirt_patch_default(u8 type, u16 clobbers, void *site, unsigned len)
262unsigned paravirt_patch_insns(void *site, unsigned len, 262unsigned paravirt_patch_insns(void *site, unsigned len,
263 const char *start, const char *end); 263 const char *start, const char *end);
264 264
265int paravirt_disable_iospace(void);
265 266
266/* 267/*
267 * This generates an indirect call based on the operation type number. 268 * This generates an indirect call based on the operation type number.