Attachment 237931 Details for Bug 316371 – patch that overcomes the 4GB guest PAE limitation

[patch] patch that overcomes the 4GB guest PAE limitation

PAE_HV_4GB_limitaion_fix.patch (text/plain), 1.27 KB, created by Bhavna Sarathy on 2007-10-25 19:52:00 UTC

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Creator: Bhavna Sarathy

Created: 2007-10-25 19:52:00 UTC

Size: 1.27 KB

patch

obsolete

>diff -r f6281485daa9 xen/arch/x86/hvm/svm/svm.c
>--- a/xen/arch/x86/hvm/svm/svm.c	Fri Apr 06 04:58:02 2007 -0500
>+++ b/xen/arch/x86/hvm/svm/svm.c	Mon Apr 09 11:35:41 2007 -0500
>@@ -2349,6 +2349,25 @@ void svm_handle_invlpg(const short invlp
> }
> 
> 
>+#if CONFIG_PAGING_LEVELS == 3
>+/* Nested paging does not support PAE guests with more than 4GB memory.
>We 
>+ * solve this problem by removing guest e820entry in memory map.
>+ */
>+static void npt_fix_e820_entry(void)
>+{
>+    struct e820entry *e820entry;
>+    unsigned char * e820_page;
>+    unsigned char nr_map;
>+
>+    e820_page = 
>+        map_domain_page(get_mfn_from_gpfn(E820_MAP_PAGE >>
>PAGE_SHIFT));
>+    e820entry = (struct e820entry *)(e820_page + E820_MAP_OFFSET);
>+    nr_map = *((unsigned char *)(e820_page + E820_MAP_NR_OFFSET));
>+    if ( e820entry[nr_map-1].addr > 0xF0000000UL ) {
>+        *((unsigned char *)(e820_page + E820_MAP_NR_OFFSET)) = (nr_map
>- 1);
>+    }
>+}
>+#endif
> /*
>  * Reset to realmode causes execution to start at 0xF000:0xFFF0 in
>  * 16-bit realmode.  Basically, this mimics a processor reset.
>@@ -2439,6 +2458,11 @@ static int svm_do_vmmcall_reset_to_realm
> 
>     vmcb->rax = 0;
>     vmcb->rsp = 0;
>+
>+#if CONFIG_PAGING_LEVELS == 3
>+    if ( opt_hap_enabled )
>+        npt_fix_e820_entry();
>+#endif
> 
>     return 0;
> }
>
>

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Attachments on bug 316371: 237931 | 239131 | 278811