On Fri, 7 Feb 2020 06:39:28 -0500
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
> From: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
>
> This provides the basic ultravisor calls and page table handling to cope
> with secure guests:
> - provide arch_make_page_accessible
> - make pages accessible after unmapping of secure guests
> - provide the ultravisor commands convert to/from secure
> - provide the ultravisor commands pin/unpin shared
> - provide callbacks to make pages secure (inacccessible)
> - we check for the expected pin count to only make pages secure if the
> host is not accessing them
> - we fence hugetlbfs for secure pages
>
> Co-developed-by: Ulrich Weigand <Ulrich.Weigand@xxxxxxxxxx>
> Signed-off-by: Ulrich Weigand <Ulrich.Weigand@xxxxxxxxxx>
> Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
> [borntraeger@xxxxxxxxxx: patch merging, splitting, fixing]
> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ---
> arch/s390/include/asm/gmap.h | 2 +
> arch/s390/include/asm/mmu.h | 2 +
> arch/s390/include/asm/mmu_context.h | 1 +
> arch/s390/include/asm/page.h | 5 +
> arch/s390/include/asm/pgtable.h | 34 +++++-
> arch/s390/include/asm/uv.h | 52 +++++++++
> arch/s390/kernel/uv.c | 172 ++++++++++++++++++++++++++++
> 7 files changed, 263 insertions(+), 5 deletions(-)
(...)
> +/*
> + * Requests the Ultravisor to encrypt a guest page and make it
> + * accessible to the host for paging (export).
> + *
> + * @paddr: Absolute host address of page to be exported
> + */
> +int uv_convert_from_secure(unsigned long paddr)
> +{
> + struct uv_cb_cfs uvcb = {
> + .header.cmd = UVC_CMD_CONV_FROM_SEC_STOR,
> + .header.len = sizeof(uvcb),
> + .paddr = paddr
> + };
> +
> + uv_call(0, (u64)&uvcb);
> +
> + if (uvcb.header.rc == 1 || uvcb.header.rc == 0x107)
I think this either wants a comment or some speaking #defines.
> + return 0;
> + return -EINVAL;
> +}
(...)
