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Tue, 23 Dec 2025 16:13:02 -0800 (PST) X-Google-Smtp-Source: AGHT+IGFcVvVQCTcvc4gpZOC/BTSrK/9Og8bNsbt/fF1seFkODFGvEa5bqxZbDem6cTMnGnwjd+SYw== X-Received: by 2002:a05:600c:6096:b0:479:3a88:de5f with SMTP id 5b1f17b1804b1-47d1959d6eemr161813625e9.36.1766535181572; Tue, 23 Dec 2025 16:13:01 -0800 (PST) Received: from [192.168.10.48] ([151.95.145.106]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47be3aa8fd9sm123107605e9.10.2025.12.23.16.12.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Dec 2025 16:13:00 -0800 (PST) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: seanjc@google.com, x86@kernel.org Subject: [PATCH 4/5] selftests, kvm: try getting XFD and XSAVE state out of sync Date: Wed, 24 Dec 2025 01:12:48 +0100 Message-ID: <20251224001249.1041934-5-pbonzini@redhat.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251224001249.1041934-1-pbonzini@redhat.com> References: <20251224001249.1041934-1-pbonzini@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The host is allowed to set FPU state that includes a disabled xstate component. Check that this does not cause bad effects. Signed-off-by: Paolo Bonzini --- tools/testing/selftests/kvm/x86/amx_test.c | 25 +++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/kvm/x86/amx_test.c b/tools/testing/sel= ftests/kvm/x86/amx_test.c index dd980cdac5df..5222ec6f71d3 100644 --- a/tools/testing/selftests/kvm/x86/amx_test.c +++ b/tools/testing/selftests/kvm/x86/amx_test.c @@ -142,7 +142,16 @@ static void __attribute__((__flatten__)) guest_code(st= ruct tile_config *amx_cfg, GUEST_SYNC(3); /* Check save/restore when trap to userspace */ __tileloadd(tiledata); + GUEST_SYNC(4); + /* xfd=3D0x40000, disable amx tiledata */ + wrmsr(MSR_IA32_XFD, XFEATURE_MASK_XTILE_DATA); + + GUEST_SYNC(5); + /* host tries setting tiledata while guest XFD is set */ + GUEST_SYNC(6); + + wrmsr(MSR_IA32_XFD, 0); __tilerelease(); GUEST_SYNC(10); /* @@ -202,6 +211,7 @@ int main(int argc, char *argv[]) struct kvm_vcpu *vcpu; struct kvm_vm *vm; struct kvm_x86_state *state; + struct kvm_x86_state *tile_state =3D NULL; int xsave_restore_size; vm_vaddr_t amx_cfg, tiledata, xstate; struct ucall uc; @@ -259,6 +269,7 @@ int main(int argc, char *argv[]) case 1: case 2: case 3: + case 6: case 10: case 11: case 12: @@ -267,8 +278,7 @@ int main(int argc, char *argv[]) break; case 4: case 15: - fprintf(stderr, - "GUEST_SYNC(%ld), check save/restore status\n", uc.args[1]); + fprintf(stderr, "GUEST_SYNC(%ld), check save/restore status\n", uc.arg= s[1]); =20 /* Compacted mode, get amx offset by xsave area * size subtract 8K amx size. @@ -280,8 +290,17 @@ int main(int argc, char *argv[]) /* Only check TMM0 register, 1 tile */ ret =3D memcmp(amx_start, tiles_data, TILE_SIZE); TEST_ASSERT(ret =3D=3D 0, "memcmp failed, ret=3D%d", ret); - kvm_x86_state_cleanup(state); + if (uc.args[1] =3D=3D 4) + tile_state =3D state; + else + kvm_x86_state_cleanup(state); break; + case 5: + fprintf(stderr, "GUEST_SYNC(%ld), before KVM_SET_XSAVE\n", uc.args[1]); + vcpu_xsave_set(vcpu, tile_state->xsave); + fprintf(stderr, "GUEST_SYNC(%ld), after KVM_SET_XSAVE\n", uc.args[1]); + /* do not restore full state */ + continue; case 14: fprintf(stderr, "GUEST_SYNC(%ld), #NM exception and enable amx\n", uc.args[1]); --=20 2.52.0