| Message ID | 20210128154747.4242-1-yu.c.zhang@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: Documentation: Fix documentation for nested. | expand |
On 28/01/21 16:47, Yu Zhang wrote: > Nested VMX was enabled by default in commit <1e58e5e59148> ("KVM: > VMX: enable nested virtualization by default"), which was merged > in Linux 4.20. This patch is to fix the documentation accordingly. > > Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com> > --- > Documentation/virt/kvm/nested-vmx.rst | 6 ++++-- > Documentation/virt/kvm/running-nested-guests.rst | 2 +- > 2 files changed, 5 insertions(+), 3 deletions(-) > > diff --git a/Documentation/virt/kvm/nested-vmx.rst b/Documentation/virt/kvm/nested-vmx.rst > index 6ab4e35..ac2095d 100644 > --- a/Documentation/virt/kvm/nested-vmx.rst > +++ b/Documentation/virt/kvm/nested-vmx.rst > @@ -37,8 +37,10 @@ call L2. > Running nested VMX > ------------------ > > -The nested VMX feature is disabled by default. It can be enabled by giving > -the "nested=1" option to the kvm-intel module. > +The nested VMX feature is enabled by default since Linux kernel v4.20. For > +older Linux kernel, it can be enabled by giving the "nested=1" option to the > +kvm-intel module. > + > > No modifications are required to user space (qemu). However, qemu's default > emulated CPU type (qemu64) does not list the "VMX" CPU feature, so it must be > diff --git a/Documentation/virt/kvm/running-nested-guests.rst b/Documentation/virt/kvm/running-nested-guests.rst > index d0a1fc7..bd70c69 100644 > --- a/Documentation/virt/kvm/running-nested-guests.rst > +++ b/Documentation/virt/kvm/running-nested-guests.rst > @@ -74,7 +74,7 @@ few: > Enabling "nested" (x86) > ----------------------- > > -From Linux kernel v4.19 onwards, the ``nested`` KVM parameter is enabled > +From Linux kernel v4.20 onwards, the ``nested`` KVM parameter is enabled > by default for Intel and AMD. (Though your Linux distribution might > override this default.) > > Queued, thanks. Paolo
diff --git a/Documentation/virt/kvm/nested-vmx.rst b/Documentation/virt/kvm/nested-vmx.rst index 6ab4e35..ac2095d 100644 --- a/Documentation/virt/kvm/nested-vmx.rst +++ b/Documentation/virt/kvm/nested-vmx.rst @@ -37,8 +37,10 @@ call L2. Running nested VMX ------------------ -The nested VMX feature is disabled by default. It can be enabled by giving -the "nested=1" option to the kvm-intel module. +The nested VMX feature is enabled by default since Linux kernel v4.20. For +older Linux kernel, it can be enabled by giving the "nested=1" option to the +kvm-intel module. + No modifications are required to user space (qemu). However, qemu's default emulated CPU type (qemu64) does not list the "VMX" CPU feature, so it must be diff --git a/Documentation/virt/kvm/running-nested-guests.rst b/Documentation/virt/kvm/running-nested-guests.rst index d0a1fc7..bd70c69 100644 --- a/Documentation/virt/kvm/running-nested-guests.rst +++ b/Documentation/virt/kvm/running-nested-guests.rst @@ -74,7 +74,7 @@ few: Enabling "nested" (x86) ----------------------- -From Linux kernel v4.19 onwards, the ``nested`` KVM parameter is enabled +From Linux kernel v4.20 onwards, the ``nested`` KVM parameter is enabled by default for Intel and AMD. (Though your Linux distribution might override this default.)
Nested VMX was enabled by default in commit <1e58e5e59148> ("KVM: VMX: enable nested virtualization by default"), which was merged in Linux 4.20. This patch is to fix the documentation accordingly. Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com> --- Documentation/virt/kvm/nested-vmx.rst | 6 ++++-- Documentation/virt/kvm/running-nested-guests.rst | 2 +- 2 files changed, 5 insertions(+), 3 deletions(-)