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kvm: i386: require KVM_CAP_SET_IDENTITY_MAP_ADDR

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This was introduced in KVM in Linux 2.6.32, we can require it unconditionally.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-10-17 14:30:44 +02:00
parent 700766ba60
commit 52b04ea49d
1 changed files with 7 additions and 13 deletions
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20
target/i386/kvm/kvm.c
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@ -99,6 +99,7 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
KVM_CAP_INFO(X86_ROBUST_SINGLESTEP),
KVM_CAP_INFO(MCE),
KVM_CAP_INFO(ADJUST_CLOCK),
KVM_CAP_INFO(SET_IDENTITY_MAP_ADDR),
KVM_CAP_LAST_INFO
};
@ -2600,20 +2601,13 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
* In order to use vm86 mode, an EPT identity map and a TSS are needed.
* Since these must be part of guest physical memory, we need to allocate
* them, both by setting their start addresses in the kernel and by
* creating a corresponding e820 entry. We need 4 pages before the BIOS.
*
* Older KVM versions may not support setting the identity map base. In
* that case we need to stick with the default, i.e. a 256K maximum BIOS
* size.
* creating a corresponding e820 entry. We need 4 pages before the BIOS,
* so this value allows up to 16M BIOSes.
*/
if (kvm_check_extension(s, KVM_CAP_SET_IDENTITY_MAP_ADDR)) {
/* Allows up to 16M BIOSes. */
identity_base = 0xfeffc000;
ret = kvm_vm_ioctl(s, KVM_SET_IDENTITY_MAP_ADDR, &identity_base);
if (ret < 0) {
return ret;
}
identity_base = 0xfeffc000;
ret = kvm_vm_ioctl(s, KVM_SET_IDENTITY_MAP_ADDR, &identity_base);
if (ret < 0) {
return ret;
}
/* Set TSS base one page after EPT identity map. */