[kvm-unit-tests,v2,01/10] lib: s390x: sie: Add sca allocation and freeing

Commit Message

Janosch Frank Dec. 7, 2021, 3:59 p.m. UTC

For protected guests we always need a ESCA so let's add functions to
create and destroy SCAs on demand. We don't have scheduling and I
don't expect multiple VCPU SIE in the next few months so SCA content
handling is not added.

Signed-off-by: Janosch Frank <[e-mail]>
Reviewed-by: Claudio Imbrenda <[e-mail]>
---
 lib/s390x/sie.c | 12 ++++++++++++
 lib/s390x/sie.h |  2 ++
 2 files changed, 14 insertions(+)

Patch

diff --git a/lib/s390x/sie.c b/lib/s390x/sie.c
index b965b314..51d3b94e 100644
--- a/lib/s390x/sie.c
+++ b/lib/s390x/sie.c
@@ -55,6 +55,16 @@  void sie(struct vm *vm)
 	vm->save_area.guest.grs[15] = vm->sblk->gg15;
 }
 
+void sie_guest_sca_create(struct vm *vm)
+{
+	vm->sca = (struct esca_block *)alloc_page();
+
+	/* Let's start out with one page of ESCA for now */
+	vm->sblk->scaoh = ((uint64_t)vm->sca >> 32);
+	vm->sblk->scaol = (uint64_t)vm->sca & ~0x3fU;
+	vm->sblk->ecb2 |= ECB2_ESCA;
+}
+
 /* Initializes the struct vm members like the SIE control block. */
 void sie_guest_create(struct vm *vm, uint64_t guest_mem, uint64_t guest_mem_len)
 {
@@ -80,4 +90,6 @@  void sie_guest_destroy(struct vm *vm)
 {
 	free_page(vm->crycb);
 	free_page(vm->sblk);
+	if (vm->sblk->ecb2 & ECB2_ESCA)
+		free_page(vm->sca);
 }
diff --git a/lib/s390x/sie.h b/lib/s390x/sie.h
index 7ef7251b..f34e3c80 100644
--- a/lib/s390x/sie.h
+++ b/lib/s390x/sie.h
@@ -191,6 +191,7 @@  struct vm_save_area {
 struct vm {
 	struct kvm_s390_sie_block *sblk;
 	struct vm_save_area save_area;
+	void *sca;				/* System Control Area */
 	uint8_t *crycb;				/* Crypto Control Block */
 	/* Ptr to first guest page */
 	uint8_t *guest_mem;
@@ -203,6 +204,7 @@  void sie(struct vm *vm);
 void sie_expect_validity(void);
 void sie_check_validity(uint16_t vir_exp);
 void sie_handle_validity(struct vm *vm);
+void sie_guest_sca_create(struct vm *vm);
 void sie_guest_create(struct vm *vm, uint64_t guest_mem, uint64_t guest_mem_len);
 void sie_guest_destroy(struct vm *vm);