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// SPDX-License-Identifier: GPL-2.0
/*
* Guest memory management for KVM/s390
*
* Copyright IBM Corp. 2008, 2020, 2024
*
* Author(s): Claudio Imbrenda <imbrenda@linux.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* David Hildenbrand <david@redhat.com>
* Janosch Frank <frankja@linux.vnet.ibm.com>
*/
#include <linux/compiler.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/pgtable.h>
#include <linux/pagemap.h>
#include <asm/lowcore.h>
#include <asm/gmap.h>
#include <asm/uv.h>
#include "gmap.h"
/**
* gmap_make_secure() - make one guest page secure
* @gmap: the guest gmap
* @gaddr: the guest address that needs to be made secure
* @uvcb: the UVCB specifying which operation needs to be performed
*
* Context: needs to be called with kvm->srcu held.
* Return: 0 on success, < 0 in case of error.
*/
int gmap_make_secure(struct gmap *gmap, unsigned long gaddr, void *uvcb)
{
struct kvm *kvm = gmap->private;
unsigned long vmaddr;
lockdep_assert_held(&kvm->srcu);
vmaddr = gfn_to_hva(kvm, gpa_to_gfn(gaddr));
if (kvm_is_error_hva(vmaddr))
return -EFAULT;
return make_hva_secure(gmap->mm, vmaddr, uvcb);
}
int gmap_convert_to_secure(struct gmap *gmap, unsigned long gaddr)
{
struct uv_cb_cts uvcb = {
.header.cmd = UVC_CMD_CONV_TO_SEC_STOR,
.header.len = sizeof(uvcb),
.guest_handle = gmap->guest_handle,
.gaddr = gaddr,
};
return gmap_make_secure(gmap, gaddr, &uvcb);
}
/**
* __gmap_destroy_page() - Destroy a guest page.
* @gmap: the gmap of the guest
* @page: the page to destroy
*
* An attempt will be made to destroy the given guest page. If the attempt
* fails, an attempt is made to export the page. If both attempts fail, an
* appropriate error is returned.
*
* Context: must be called holding the mm lock for gmap->mm
*/
static int __gmap_destroy_page(struct gmap *gmap, struct page *page)
{
struct folio *folio = page_folio(page);
int rc;
/*
* See gmap_make_secure(): large folios cannot be secure. Small
* folio implies FW_LEVEL_PTE.
*/
if (folio_test_large(folio))
return -EFAULT;
rc = uv_destroy_folio(folio);
/*
* Fault handlers can race; it is possible that two CPUs will fault
* on the same secure page. One CPU can destroy the page, reboot,
* re-enter secure mode and import it, while the second CPU was
* stuck at the beginning of the handler. At some point the second
* CPU will be able to progress, and it will not be able to destroy
* the page. In that case we do not want to terminate the process,
* we instead try to export the page.
*/
if (rc)
rc = uv_convert_from_secure_folio(folio);
return rc;
}
/**
* gmap_destroy_page() - Destroy a guest page.
* @gmap: the gmap of the guest
* @gaddr: the guest address to destroy
*
* An attempt will be made to destroy the given guest page. If the attempt
* fails, an attempt is made to export the page. If both attempts fail, an
* appropriate error is returned.
*
* Context: may sleep.
*/
int gmap_destroy_page(struct gmap *gmap, unsigned long gaddr)
{
struct page *page;
int rc = 0;
mmap_read_lock(gmap->mm);
page = gfn_to_page(gmap->private, gpa_to_gfn(gaddr));
if (page)
rc = __gmap_destroy_page(gmap, page);
kvm_release_page_clean(page);
mmap_read_unlock(gmap->mm);
return rc;
}
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