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Date: Mon, 13 Dec 2021 15:28:20 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>, shuah@...nel.org,
seanjc@...gle.com, ricarkol@...gle.com, maz@...nel.org,
kvm@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH MANUALSEL 5.15 7/9] KVM: selftests: Avoid KVM_SET_CPUID2
after KVM_RUN in hyperv_features test
On 12/13/21 15:19, Sasha Levin wrote:
> From: Vitaly Kuznetsov <vkuznets@...hat.com>
>
> [ Upstream commit 6c1186430a808f97e2052bd5d9eff12c5d5defb0 ]
>
> hyperv_features's sole purpose is to test access to various Hyper-V MSRs
> and hypercalls with different CPUID data. As KVM_SET_CPUID2 after KVM_RUN
> is deprecated and soon-to-be forbidden, avoid it by re-creating test VM
> for each sub-test.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> Message-Id: <20211122175818.608220-2-vkuznets@...hat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
> .../selftests/kvm/x86_64/hyperv_features.c | 140 +++++++++---------
> 1 file changed, 71 insertions(+), 69 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_features.c b/tools/testing/selftests/kvm/x86_64/hyperv_features.c
> index 91d88aaa98992..672915ce73d8f 100644
> --- a/tools/testing/selftests/kvm/x86_64/hyperv_features.c
> +++ b/tools/testing/selftests/kvm/x86_64/hyperv_features.c
> @@ -165,10 +165,10 @@ static void hv_set_cpuid(struct kvm_vm *vm, struct kvm_cpuid2 *cpuid,
> vcpu_set_cpuid(vm, VCPU_ID, cpuid);
> }
>
> -static void guest_test_msrs_access(struct kvm_vm *vm, struct msr_data *msr,
> - struct kvm_cpuid2 *best)
> +static void guest_test_msrs_access(void)
> {
> struct kvm_run *run;
> + struct kvm_vm *vm;
> struct ucall uc;
> int stage = 0, r;
> struct kvm_cpuid_entry2 feat = {
> @@ -180,11 +180,34 @@ static void guest_test_msrs_access(struct kvm_vm *vm, struct msr_data *msr,
> struct kvm_cpuid_entry2 dbg = {
> .function = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES
> };
> - struct kvm_enable_cap cap = {0};
> -
> - run = vcpu_state(vm, VCPU_ID);
> + struct kvm_cpuid2 *best;
> + vm_vaddr_t msr_gva;
> + struct kvm_enable_cap cap = {
> + .cap = KVM_CAP_HYPERV_ENFORCE_CPUID,
> + .args = {1}
> + };
> + struct msr_data *msr;
>
> while (true) {
> + vm = vm_create_default(VCPU_ID, 0, guest_msr);
> +
> + msr_gva = vm_vaddr_alloc_page(vm);
> + memset(addr_gva2hva(vm, msr_gva), 0x0, getpagesize());
> + msr = addr_gva2hva(vm, msr_gva);
> +
> + vcpu_args_set(vm, VCPU_ID, 1, msr_gva);
> + vcpu_enable_cap(vm, VCPU_ID, &cap);
> +
> + vcpu_set_hv_cpuid(vm, VCPU_ID);
> +
> + best = kvm_get_supported_hv_cpuid();
> +
> + vm_init_descriptor_tables(vm);
> + vcpu_init_descriptor_tables(vm, VCPU_ID);
> + vm_install_exception_handler(vm, GP_VECTOR, guest_gp_handler);
> +
> + run = vcpu_state(vm, VCPU_ID);
> +
> switch (stage) {
> case 0:
> /*
> @@ -315,6 +338,7 @@ static void guest_test_msrs_access(struct kvm_vm *vm, struct msr_data *msr,
> * capability enabled and guest visible CPUID bit unset.
> */
> cap.cap = KVM_CAP_HYPERV_SYNIC2;
> + cap.args[0] = 0;
> vcpu_enable_cap(vm, VCPU_ID, &cap);
> break;
> case 22:
> @@ -461,9 +485,9 @@ static void guest_test_msrs_access(struct kvm_vm *vm, struct msr_data *msr,
>
> switch (get_ucall(vm, VCPU_ID, &uc)) {
> case UCALL_SYNC:
> - TEST_ASSERT(uc.args[1] == stage,
> - "Unexpected stage: %ld (%d expected)\n",
> - uc.args[1], stage);
> + TEST_ASSERT(uc.args[1] == 0,
> + "Unexpected stage: %ld (0 expected)\n",
> + uc.args[1]);
> break;
> case UCALL_ABORT:
> TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
> @@ -474,13 +498,14 @@ static void guest_test_msrs_access(struct kvm_vm *vm, struct msr_data *msr,
> }
>
> stage++;
> + kvm_vm_free(vm);
> }
> }
>
> -static void guest_test_hcalls_access(struct kvm_vm *vm, struct hcall_data *hcall,
> - void *input, void *output, struct kvm_cpuid2 *best)
> +static void guest_test_hcalls_access(void)
> {
> struct kvm_run *run;
> + struct kvm_vm *vm;
> struct ucall uc;
> int stage = 0, r;
> struct kvm_cpuid_entry2 feat = {
> @@ -493,10 +518,38 @@ static void guest_test_hcalls_access(struct kvm_vm *vm, struct hcall_data *hcall
> struct kvm_cpuid_entry2 dbg = {
> .function = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES
> };
> -
> - run = vcpu_state(vm, VCPU_ID);
> + struct kvm_enable_cap cap = {
> + .cap = KVM_CAP_HYPERV_ENFORCE_CPUID,
> + .args = {1}
> + };
> + vm_vaddr_t hcall_page, hcall_params;
> + struct hcall_data *hcall;
> + struct kvm_cpuid2 *best;
>
> while (true) {
> + vm = vm_create_default(VCPU_ID, 0, guest_hcall);
> +
> + vm_init_descriptor_tables(vm);
> + vcpu_init_descriptor_tables(vm, VCPU_ID);
> + vm_install_exception_handler(vm, UD_VECTOR, guest_ud_handler);
> +
> + /* Hypercall input/output */
> + hcall_page = vm_vaddr_alloc_pages(vm, 2);
> + hcall = addr_gva2hva(vm, hcall_page);
> + memset(addr_gva2hva(vm, hcall_page), 0x0, 2 * getpagesize());
> +
> + hcall_params = vm_vaddr_alloc_page(vm);
> + memset(addr_gva2hva(vm, hcall_params), 0x0, getpagesize());
> +
> + vcpu_args_set(vm, VCPU_ID, 2, addr_gva2gpa(vm, hcall_page), hcall_params);
> + vcpu_enable_cap(vm, VCPU_ID, &cap);
> +
> + vcpu_set_hv_cpuid(vm, VCPU_ID);
> +
> + best = kvm_get_supported_hv_cpuid();
> +
> + run = vcpu_state(vm, VCPU_ID);
> +
> switch (stage) {
> case 0:
> hcall->control = 0xdeadbeef;
> @@ -606,9 +659,9 @@ static void guest_test_hcalls_access(struct kvm_vm *vm, struct hcall_data *hcall
>
> switch (get_ucall(vm, VCPU_ID, &uc)) {
> case UCALL_SYNC:
> - TEST_ASSERT(uc.args[1] == stage,
> - "Unexpected stage: %ld (%d expected)\n",
> - uc.args[1], stage);
> + TEST_ASSERT(uc.args[1] == 0,
> + "Unexpected stage: %ld (0 expected)\n",
> + uc.args[1]);
> break;
> case UCALL_ABORT:
> TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
> @@ -619,66 +672,15 @@ static void guest_test_hcalls_access(struct kvm_vm *vm, struct hcall_data *hcall
> }
>
> stage++;
> + kvm_vm_free(vm);
> }
> }
>
> int main(void)
> {
> - struct kvm_cpuid2 *best;
> - struct kvm_vm *vm;
> - vm_vaddr_t msr_gva, hcall_page, hcall_params;
> - struct kvm_enable_cap cap = {
> - .cap = KVM_CAP_HYPERV_ENFORCE_CPUID,
> - .args = {1}
> - };
> -
> - /* Test MSRs */
> - vm = vm_create_default(VCPU_ID, 0, guest_msr);
> -
> - msr_gva = vm_vaddr_alloc_page(vm);
> - memset(addr_gva2hva(vm, msr_gva), 0x0, getpagesize());
> - vcpu_args_set(vm, VCPU_ID, 1, msr_gva);
> - vcpu_enable_cap(vm, VCPU_ID, &cap);
> -
> - vcpu_set_hv_cpuid(vm, VCPU_ID);
> -
> - best = kvm_get_supported_hv_cpuid();
> -
> - vm_init_descriptor_tables(vm);
> - vcpu_init_descriptor_tables(vm, VCPU_ID);
> - vm_install_exception_handler(vm, GP_VECTOR, guest_gp_handler);
> -
> pr_info("Testing access to Hyper-V specific MSRs\n");
> - guest_test_msrs_access(vm, addr_gva2hva(vm, msr_gva),
> - best);
> - kvm_vm_free(vm);
> -
> - /* Test hypercalls */
> - vm = vm_create_default(VCPU_ID, 0, guest_hcall);
> -
> - vm_init_descriptor_tables(vm);
> - vcpu_init_descriptor_tables(vm, VCPU_ID);
> - vm_install_exception_handler(vm, UD_VECTOR, guest_ud_handler);
> -
> - /* Hypercall input/output */
> - hcall_page = vm_vaddr_alloc_pages(vm, 2);
> - memset(addr_gva2hva(vm, hcall_page), 0x0, 2 * getpagesize());
> -
> - hcall_params = vm_vaddr_alloc_page(vm);
> - memset(addr_gva2hva(vm, hcall_params), 0x0, getpagesize());
> -
> - vcpu_args_set(vm, VCPU_ID, 2, addr_gva2gpa(vm, hcall_page), hcall_params);
> - vcpu_enable_cap(vm, VCPU_ID, &cap);
> -
> - vcpu_set_hv_cpuid(vm, VCPU_ID);
> -
> - best = kvm_get_supported_hv_cpuid();
> + guest_test_msrs_access();
>
> pr_info("Testing access to Hyper-V hypercalls\n");
> - guest_test_hcalls_access(vm, addr_gva2hva(vm, hcall_params),
> - addr_gva2hva(vm, hcall_page),
> - addr_gva2hva(vm, hcall_page) + getpagesize(),
> - best);
> -
> - kvm_vm_free(vm);
> + guest_test_hcalls_access();
> }
>
NACK
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