Commit 50c03801 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

KVM: SEV: Pin guest memory for write for RECEIVE_UPDATE_DATA 



Require the target guest page to be writable when pinning memory for
RECEIVE_UPDATE_DATA.  Per the SEV API, the PSP writes to guest memory:

  The result is then encrypted with GCTX.VEK and written to the memory
  pointed to by GUEST_PADDR field.

Fixes: 15fb7de1 ("KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command")
Cc: stable@vger.kernel.org
Cc: Peter Gonda <pgonda@google.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20210914210951.2994260-2-seanjc@google.com>
Reviewed-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Reviewed-by: default avatarPeter Gonda <pgonda@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent f1815e0a

arch/x86/kvm/svm/sev.c

+1 −1
Original line number Diff line number Diff line
@@ -1473,7 +1473,7 @@ static int sev_receive_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) 


	/* Pin guest memory */

	guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK,

				    PAGE_SIZE, &n, 0);

				    PAGE_SIZE, &n, 1);

	if (IS_ERR(guest_page)) {

		ret = PTR_ERR(guest_page);

		goto e_free_trans;