KVM: s390: selftests: Add uc_map_unmap VM test case
Add a test case verifying basic running and interaction of ucontrol VMs. Fill the segment and page tables for allocated memory and map memory on first access. * uc_map_unmap Store and load data to mapped and unmapped memory and use pic segment translation handling to map memory on access. Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com> Reviewed-by: Janosch Frank <frankja@linux.ibm.com> Link: https://lore.kernel.org/r/20241107141024.238916-2-schlameuss@linux.ibm.com [frankja@linux.ibm.com: Fixed patch prefix] Signed-off-by: Janosch Frank <frankja@linux.ibm.com> Message-ID: <20241107141024.238916-2-schlameuss@linux.ibm.com>
This commit is contained in:
Christoph Schlameuss
committed by
Janosch Frank
Janosch Frank
parent
75ec613efa
commit
ae16b0ab3b
@@ -16,7 +16,11 @@
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#include <linux/capability.h>
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#include <linux/sizes.h>
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#define PGM_SEGMENT_TRANSLATION 0x10
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#define VM_MEM_SIZE (4 * SZ_1M)
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#define VM_MEM_EXT_SIZE (2 * SZ_1M)
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#define VM_MEM_MAX_M ((VM_MEM_SIZE + VM_MEM_EXT_SIZE) / SZ_1M)
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/* so directly declare capget to check caps without libcap */
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int capget(cap_user_header_t header, cap_user_data_t data);
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@@ -58,6 +62,23 @@ asm("test_gprs_asm:\n"
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" j 0b\n"
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);
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/* Test program manipulating memory */
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extern char test_mem_asm[];
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asm("test_mem_asm:\n"
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"xgr %r0, %r0\n"
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"0:\n"
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" ahi %r0,1\n"
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" st %r1,0(%r5,%r6)\n"
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" xgr %r1,%r1\n"
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" l %r1,0(%r5,%r6)\n"
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" ahi %r0,1\n"
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" diag 0,0,0x44\n"
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" j 0b\n"
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);
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FIXTURE(uc_kvm)
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{
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struct kvm_s390_sie_block *sie_block;
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@@ -67,6 +88,7 @@ FIXTURE(uc_kvm)
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uintptr_t base_hva;
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uintptr_t code_hva;
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int kvm_run_size;
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vm_paddr_t pgd;
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void *vm_mem;
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int vcpu_fd;
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int kvm_fd;
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@@ -116,7 +138,7 @@ FIXTURE_SETUP(uc_kvm)
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self->base_gpa = 0;
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self->code_gpa = self->base_gpa + (3 * SZ_1M);
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self->vm_mem = aligned_alloc(SZ_1M, VM_MEM_SIZE);
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self->vm_mem = aligned_alloc(SZ_1M, VM_MEM_MAX_M * SZ_1M);
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ASSERT_NE(NULL, self->vm_mem) TH_LOG("malloc failed %u", errno);
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self->base_hva = (uintptr_t)self->vm_mem;
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self->code_hva = self->base_hva - self->base_gpa + self->code_gpa;
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@@ -222,6 +244,60 @@ TEST(uc_cap_hpage)
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close(kvm_fd);
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}
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/* calculate host virtual addr from guest physical addr */
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static void *gpa2hva(FIXTURE_DATA(uc_kvm) *self, u64 gpa)
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{
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return (void *)(self->base_hva - self->base_gpa + gpa);
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}
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/* map / make additional memory available */
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static int uc_map_ext(FIXTURE_DATA(uc_kvm) *self, u64 vcpu_addr, u64 length)
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{
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struct kvm_s390_ucas_mapping map = {
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.user_addr = (u64)gpa2hva(self, vcpu_addr),
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.vcpu_addr = vcpu_addr,
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.length = length,
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};
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pr_info("ucas map %p %p 0x%llx",
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(void *)map.user_addr, (void *)map.vcpu_addr, map.length);
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return ioctl(self->vcpu_fd, KVM_S390_UCAS_MAP, &map);
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}
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/* unmap previously mapped memory */
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static int uc_unmap_ext(FIXTURE_DATA(uc_kvm) *self, u64 vcpu_addr, u64 length)
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{
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struct kvm_s390_ucas_mapping map = {
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.user_addr = (u64)gpa2hva(self, vcpu_addr),
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.vcpu_addr = vcpu_addr,
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.length = length,
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};
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pr_info("ucas unmap %p %p 0x%llx",
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(void *)map.user_addr, (void *)map.vcpu_addr, map.length);
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return ioctl(self->vcpu_fd, KVM_S390_UCAS_UNMAP, &map);
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}
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/* handle ucontrol exit by mapping the accessed segment */
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static void uc_handle_exit_ucontrol(FIXTURE_DATA(uc_kvm) *self)
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{
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struct kvm_run *run = self->run;
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u64 seg_addr;
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int rc;
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TEST_ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason);
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switch (run->s390_ucontrol.pgm_code) {
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case PGM_SEGMENT_TRANSLATION:
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seg_addr = run->s390_ucontrol.trans_exc_code & ~(SZ_1M - 1);
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pr_info("ucontrol pic segment translation 0x%llx, mapping segment 0x%lx\n",
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run->s390_ucontrol.trans_exc_code, seg_addr);
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/* map / make additional memory available */
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rc = uc_map_ext(self, seg_addr, SZ_1M);
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TEST_ASSERT_EQ(0, rc);
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break;
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default:
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TEST_FAIL("UNEXPECTED PGM CODE %d", run->s390_ucontrol.pgm_code);
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}
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}
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/* verify SIEIC exit
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* * fail on codes not expected in the test cases
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*/
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@@ -255,6 +331,12 @@ static bool uc_handle_exit(FIXTURE_DATA(uc_kvm) * self)
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struct kvm_run *run = self->run;
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switch (run->exit_reason) {
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case KVM_EXIT_S390_UCONTROL:
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/** check program interruption code
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* handle page fault --> ucas map
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*/
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uc_handle_exit_ucontrol(self);
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break;
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case KVM_EXIT_S390_SIEIC:
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return uc_handle_sieic(self);
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default:
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@@ -286,6 +368,67 @@ static void uc_assert_diag44(FIXTURE_DATA(uc_kvm) * self)
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TEST_ASSERT_EQ(0x440000, sie_block->ipb);
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}
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TEST_F(uc_kvm, uc_map_unmap)
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{
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struct kvm_sync_regs *sync_regs = &self->run->s.regs;
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struct kvm_run *run = self->run;
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const u64 disp = 1;
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int rc;
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/* copy test_mem_asm to code_hva / code_gpa */
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TH_LOG("copy code %p to vm mapped memory %p / %p",
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&test_mem_asm, (void *)self->code_hva, (void *)self->code_gpa);
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memcpy((void *)self->code_hva, &test_mem_asm, PAGE_SIZE);
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/* DAT disabled + 64 bit mode */
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run->psw_mask = 0x0000000180000000ULL;
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run->psw_addr = self->code_gpa;
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/* set register content for test_mem_asm to access not mapped memory*/
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sync_regs->gprs[1] = 0x55;
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sync_regs->gprs[5] = self->base_gpa;
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sync_regs->gprs[6] = VM_MEM_SIZE + disp;
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run->kvm_dirty_regs |= KVM_SYNC_GPRS;
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/* run and expect to fail with ucontrol pic segment translation */
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ASSERT_EQ(0, uc_run_once(self));
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ASSERT_EQ(1, sync_regs->gprs[0]);
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ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason);
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ASSERT_EQ(PGM_SEGMENT_TRANSLATION, run->s390_ucontrol.pgm_code);
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ASSERT_EQ(self->base_gpa + VM_MEM_SIZE, run->s390_ucontrol.trans_exc_code);
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/* fail to map memory with not segment aligned address */
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rc = uc_map_ext(self, self->base_gpa + VM_MEM_SIZE + disp, VM_MEM_EXT_SIZE);
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ASSERT_GT(0, rc)
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TH_LOG("ucas map for non segment address should fail but didn't; "
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"result %d not expected, %s", rc, strerror(errno));
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/* map / make additional memory available */
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rc = uc_map_ext(self, self->base_gpa + VM_MEM_SIZE, VM_MEM_EXT_SIZE);
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ASSERT_EQ(0, rc)
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TH_LOG("ucas map result %d not expected, %s", rc, strerror(errno));
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ASSERT_EQ(0, uc_run_once(self));
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ASSERT_EQ(false, uc_handle_exit(self));
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uc_assert_diag44(self);
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/* assert registers and memory are in expected state */
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ASSERT_EQ(2, sync_regs->gprs[0]);
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ASSERT_EQ(0x55, sync_regs->gprs[1]);
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ASSERT_EQ(0x55, *(u32 *)gpa2hva(self, self->base_gpa + VM_MEM_SIZE + disp));
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/* unmap and run loop again */
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rc = uc_unmap_ext(self, self->base_gpa + VM_MEM_SIZE, VM_MEM_EXT_SIZE);
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ASSERT_EQ(0, rc)
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TH_LOG("ucas unmap result %d not expected, %s", rc, strerror(errno));
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ASSERT_EQ(0, uc_run_once(self));
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ASSERT_EQ(3, sync_regs->gprs[0]);
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ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason);
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ASSERT_EQ(PGM_SEGMENT_TRANSLATION, run->s390_ucontrol.pgm_code);
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/* handle ucontrol exit and remap memory after previous map and unmap */
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ASSERT_EQ(true, uc_handle_exit(self));
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}
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TEST_F(uc_kvm, uc_gprs)
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{
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struct kvm_sync_regs *sync_regs = &self->run->s.regs;
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