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lguest: fix guest crash on non-linear addresses in gdt pvops

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Fixes guest crash 'lguest: bad read address 0x4800000 len 256'

The new per-cpu allocator ends up handing a non-linear address to
write_gdt_entry.  We do __pa() on it, and hand it to the host, which
kills us.

I've long wanted to make the hypercall "LOAD_GDT_ENTRY" to match the IDT
code, but had no pressing reason until now.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: lguest@ozlabs.org
This commit is contained in:
Rusty Russell
2009-04-19 23:14:00 -06:00
parent 88df781afb
commit a489f0b555
5 changed files with 21 additions and 17 deletions
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4
drivers/lguest/x86/core.c
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@@ -568,8 +568,8 @@ void __exit lguest_arch_host_fini(void)
int lguest_arch_do_hcall(struct lg_cpu *cpu, struct hcall_args *args)
{
switch (args->arg0) {
case LHCALL_LOAD_GDT:
load_guest_gdt(cpu, args->arg1, args->arg2);
case LHCALL_LOAD_GDT_ENTRY:
load_guest_gdt_entry(cpu, args->arg1, args->arg2, args->arg3);
break;
case LHCALL_LOAD_IDT_ENTRY:
load_guest_idt_entry(cpu, args->arg1, args->arg2, args->arg3);