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KVM: selftests: Implement ucall() for s390x

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On s390x, we can neither exit via PIO nor MMIO, but have to use an
instruction like DIAGNOSE. Now that ucall() is implemented, we can
use it in the sync_reg_test on s390x, too.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20190731151525.17156-3-thuth@redhat.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Thomas Huth 2019-07-31 17:15:24 +02:00 committed by Christian Borntraeger
parent 2040f414d1
commit f90f57b397
3 changed files with 61 additions and 3 deletions
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2
tools/testing/selftests/kvm/Makefile
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@ -10,7 +10,7 @@ UNAME_M := $(shell uname -m)
LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c
LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/ucall.c
LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c
LIBKVM_s390x = lib/s390x/processor.c
LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c
TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test

56
tools/testing/selftests/kvm/lib/s390x/ucall.c Normal file
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@ -0,0 +1,56 @@
// SPDX-License-Identifier: GPL-2.0
/*
* ucall support. A ucall is a "hypercall to userspace".
*
* Copyright (C) 2019 Red Hat, Inc.
*/
#include "kvm_util.h"
void ucall_init(struct kvm_vm *vm, void *arg)
{
}
void ucall_uninit(struct kvm_vm *vm)
{
}
void ucall(uint64_t cmd, int nargs, ...)
{
struct ucall uc = {
.cmd = cmd,
};
va_list va;
int i;
nargs = nargs <= UCALL_MAX_ARGS ? nargs : UCALL_MAX_ARGS;
va_start(va, nargs);
for (i = 0; i < nargs; ++i)
uc.args[i] = va_arg(va, uint64_t);
va_end(va);
/* Exit via DIAGNOSE 0x501 (normally used for breakpoints) */
asm volatile ("diag 0,%0,0x501" : : "a"(&uc) : "memory");
}
uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc)
{
struct kvm_run *run = vcpu_state(vm, vcpu_id);
struct ucall ucall = {};
if (run->exit_reason == KVM_EXIT_S390_SIEIC &&
run->s390_sieic.icptcode == 4 &&
(run->s390_sieic.ipa >> 8) == 0x83 && /* 0x83 means DIAGNOSE */
(run->s390_sieic.ipb >> 16) == 0x501) {
int reg = run->s390_sieic.ipa & 0xf;
memcpy(&ucall, addr_gva2hva(vm, run->s.regs.gprs[reg]),
sizeof(ucall));
vcpu_run_complete_io(vm, vcpu_id);
if (uc)
memcpy(uc, &ucall, sizeof(ucall));
}
return ucall.cmd;
}

6
tools/testing/selftests/kvm/s390x/sync_regs_test.c
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@ -25,9 +25,11 @@
static void guest_code(void)
{
register u64 stage asm("11") = 0;
for (;;) {
asm volatile ("diag 0,0,0x501");
asm volatile ("ahi 11,1");
GUEST_SYNC(0);
asm volatile ("ahi %0,1" : : "r"(stage));
}
}