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KVM: selftests: Test Hyper-V extended hypercall exit to userspace

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Hyper-V extended hypercalls by default exit to userspace. Verify
userspace gets the call, update the result and then verify in guest
correct result is received.

Add KVM_EXIT_HYPERV to list of "known" hypercalls so errors generate
pretty strings.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20221212183720.4062037-14-vipinsh@google.com
[sean: add KVM_EXIT_HYPERV to exit_reasons_known]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Vipin Sharma 2022-12-12 10:37:20 -08:00 committed by Sean Christopherson
parent f65092015a
commit 6032526123
3 changed files with 99 additions and 0 deletions
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1
tools/testing/selftests/kvm/Makefile
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@ -67,6 +67,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/fix_hypercall_test
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_evmcs
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_extended_hypercalls
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_ipi
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_svm_test

1
tools/testing/selftests/kvm/lib/kvm_util.c
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@ -1844,6 +1844,7 @@ static struct exit_reason {
{KVM_EXIT_X86_RDMSR, "RDMSR"},
{KVM_EXIT_X86_WRMSR, "WRMSR"},
{KVM_EXIT_XEN, "XEN"},
{KVM_EXIT_HYPERV, "HYPERV"},
#ifdef KVM_EXIT_MEMORY_NOT_PRESENT
{KVM_EXIT_MEMORY_NOT_PRESENT, "MEMORY_NOT_PRESENT"},
#endif

97
tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c Normal file
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@ -0,0 +1,97 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Test Hyper-V extended hypercall, HV_EXT_CALL_QUERY_CAPABILITIES (0x8001),
* exit to userspace and receive result in guest.
*
* Negative tests are present in hyperv_features.c
*
* Copyright 2022 Google LLC
* Author: Vipin Sharma <vipinsh@google.com>
*/
#include "kvm_util.h"
#include "processor.h"
#include "hyperv.h"
/* Any value is fine */
#define EXT_CAPABILITIES 0xbull
static void guest_code(vm_paddr_t in_pg_gpa, vm_paddr_t out_pg_gpa,
vm_vaddr_t out_pg_gva)
{
uint64_t *output_gva;
wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID);
wrmsr(HV_X64_MSR_HYPERCALL, in_pg_gpa);
output_gva = (uint64_t *)out_pg_gva;
hyperv_hypercall(HV_EXT_CALL_QUERY_CAPABILITIES, in_pg_gpa, out_pg_gpa);
/* TLFS states output will be a uint64_t value */
GUEST_ASSERT_EQ(*output_gva, EXT_CAPABILITIES);
GUEST_DONE();
}
int main(void)
{
vm_vaddr_t hcall_out_page;
vm_vaddr_t hcall_in_page;
struct kvm_vcpu *vcpu;
struct kvm_run *run;
struct kvm_vm *vm;
uint64_t *outval;
struct ucall uc;
/* Verify if extended hypercalls are supported */
if (!kvm_cpuid_has(kvm_get_supported_hv_cpuid(),
HV_ENABLE_EXTENDED_HYPERCALLS)) {
print_skip("Extended calls not supported by the kernel");
exit(KSFT_SKIP);
}
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
run = vcpu->run;
vcpu_set_hv_cpuid(vcpu);
/* Hypercall input */
hcall_in_page = vm_vaddr_alloc_pages(vm, 1);
memset(addr_gva2hva(vm, hcall_in_page), 0x0, vm->page_size);
/* Hypercall output */
hcall_out_page = vm_vaddr_alloc_pages(vm, 1);
memset(addr_gva2hva(vm, hcall_out_page), 0x0, vm->page_size);
vcpu_args_set(vcpu, 3, addr_gva2gpa(vm, hcall_in_page),
addr_gva2gpa(vm, hcall_out_page), hcall_out_page);
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_HYPERV,
"Unexpected exit reason: %u (%s)",
run->exit_reason, exit_reason_str(run->exit_reason));
outval = addr_gpa2hva(vm, run->hyperv.u.hcall.params[1]);
*outval = EXT_CAPABILITIES;
run->hyperv.u.hcall.result = HV_STATUS_SUCCESS;
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Unexpected exit reason: %u (%s)",
run->exit_reason, exit_reason_str(run->exit_reason));
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT_2(uc, "arg1 = %ld, arg2 = %ld");
break;
case UCALL_DONE:
break;
default:
TEST_FAIL("Unhandled ucall: %ld", uc.cmd);
}
kvm_vm_free(vm);
return 0;
}