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KVM: s390/mm: handle guest unpin events

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The current code tries to first pin shared pages, if that fails (e.g.
because the page is not shared) it will export them. For shared pages
this means that we get a new intercept telling us that the guest is
unsharing that page. We will unpin the page at that point in time,
following the same rules as for making a page secure (i.e. waiting for
writeback, no elevated page references, etc.)

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Claudio Imbrenda 2020-01-31 15:00:39 -05:00 committed by Christian Borntraeger
parent d274995ec2
commit 5322781008
1 changed files with 29 additions and 0 deletions
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29
arch/s390/kvm/intercept.c
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@ -16,6 +16,7 @@
#include <asm/asm-offsets.h>
#include <asm/irq.h>
#include <asm/sysinfo.h>
#include <asm/uv.h>
#include "kvm-s390.h"
#include "gaccess.h"
@ -484,12 +485,40 @@ static int handle_pv_sclp(struct kvm_vcpu *vcpu)
return 0;
}
static int handle_pv_uvc(struct kvm_vcpu *vcpu)
{
struct uv_cb_share *guest_uvcb = (void *)vcpu->arch.sie_block->sidad;
struct uv_cb_cts uvcb = {
.header.cmd = UVC_CMD_UNPIN_PAGE_SHARED,
.header.len = sizeof(uvcb),
.guest_handle = kvm_s390_pv_get_handle(vcpu->kvm),
.gaddr = guest_uvcb->paddr,
};
int rc;
if (guest_uvcb->header.cmd != UVC_CMD_REMOVE_SHARED_ACCESS) {
WARN_ONCE(1, "Unexpected notification intercept for UVC 0x%x\n",
guest_uvcb->header.cmd);
return 0;
}
rc = gmap_make_secure(vcpu->arch.gmap, uvcb.gaddr, &uvcb);
/*
* If the unpin did not succeed, the guest will exit again for the UVC
* and we will retry the unpin.
*/
if (rc == -EINVAL)
return 0;
return rc;
}
static int handle_pv_notification(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.sie_block->ipa == 0xb210)
return handle_pv_spx(vcpu);
if (vcpu->arch.sie_block->ipa == 0xb220)
return handle_pv_sclp(vcpu);
if (vcpu->arch.sie_block->ipa == 0xb9a4)
return handle_pv_uvc(vcpu);
return handle_instruction(vcpu);
}