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SubjectRe: [Xen-devel] [V0 PATCH] pvh: Disable PSE feature for now
>>> On 28.01.14 at 03:18, Mukesh Rathor <mukesh.rathor@oracle.com> wrote:
> Until now, xen did not expose PSE to pvh guest, but a patch was submitted
> to xen list to enable bunch of features for a pvh guest. PSE has not been
> looked into for PVH, so until we can do that and test it to make sure it
> works, disable the feature to avoid flood of bugs.
>
> Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
> ---
> arch/x86/xen/enlighten.c | 5 +++++
> 1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index a4d7b64..4e952046 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1497,6 +1497,11 @@ static void __init xen_pvh_early_guest_init(void)
> xen_have_vector_callback = 1;
> xen_pvh_set_cr_flags(0);
>
> + /* pvh guests are not quite ready for large pages yet */
> + setup_clear_cpu_cap(X86_FEATURE_PSE);
> + setup_clear_cpu_cap(X86_FEATURE_PSE36);

And why would you not want to also turn of 1Gb pages then?

Jan



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