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QEMU e820 reservation patch

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Hi,

Kevin and I have agreed on the approach for this one now. So here is
the latest version of the patch for QEMU, submitting e820 reservation
entries via fw_cfg.

Cheers,
Jes

Use qemu-cfg to provide the BIOS with an optional table of e820 entries.

Notify the BIOS of the location of the TSS+EPT range to by reserving
it via the e820 table.

This matches a corresponding patch for Seabios, however older versions
of Seabios will default to the hardcoded address range and stay
compatible with current QEMU.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jes Sorensen 2010-02-15 18:33:46 +01:00 • committed by Anthony Liguori
parent ed487bb1d6
commit 4c5b10b7b6
3 changed files with 53 additions and 0 deletions
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8
target-i386/kvm.c
View file

@ -24,6 +24,7 @@
#include "cpu.h"
#include "gdbstub.h"
#include "host-utils.h"
#include "hw/pc.h"
#ifdef CONFIG_KVM_PARA
#include <linux/kvm_para.h>
@ -362,6 +363,13 @@ int kvm_arch_init(KVMState *s, int smp_cpus)
* as unavaible memory. FIXME, need to ensure the e820 map deals with
* this?
*/
/*
* Tell fw_cfg to notify the BIOS to reserve the range.
*/
if (e820_add_entry(0xfffbc000, 0x4000, E820_RESERVED) < 0) {
perror("e820_add_entry() table is full");
exit(1);
}
return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, 0xfffbd000);
}