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a="68053836" X-IronPort-AV: E=Sophos;i="6.19,313,1754982000"; d="scan'208";a="68053836" X-CSE-ConnectionGUID: ERNT0Nx1ThaAhGyQlfd4jA== X-CSE-MsgGUID: LxvIqZGURLCoPlJQgObojA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,313,1754982000"; d="scan'208";a="221537207" From: Zhao Liu To: Paolo Bonzini , Marcelo Tosatti Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Chao Gao , Xin Li , John Allen , Babu Moger , Mathias Krause , Dapeng Mi , Zide Chen , Xiaoyao Li , Chenyi Qiang , Farrah Chen , Zhao Liu Subject: [PATCH v4 11/23] i386/cpu: Add missing migratable xsave features Date: Tue, 18 Nov 2025 11:42:19 +0800 Message-Id: <20251118034231.704240-12-zhao1.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251118034231.704240-1-zhao1.liu@intel.com> References: <20251118034231.704240-1-zhao1.liu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.198.163.13; envelope-from=zhao1.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1763436124393153000 Content-Type: text/plain; charset="utf-8" Xtile-cfg & xtile-data are both user xstates. Their xstates are cached in X86CPUState, and there's a related vmsd "vmstate_amx_xtile", so that it's safe to mark them as migratable. Arch lbr xstate is a supervisor xstate, and it is save & load by saving & loading related arch lbr MSRs, which are cached in X86CPUState, and there's a related vmsd "vmstate_arch_lbr". So it should be migratable. PT is still unmigratable since KVM disabled it and there's no vmsd and no other emulation/simulation support. Note, though the migratable_flags get fixed, x86_cpu_enable_xsave_components() still overrides supported xstates bitmaps regardless the masking of migratable_flags. This is another issue, and would be fixed in follow-up refactoring. Tested-by: Farrah Chen Signed-off-by: Zhao Liu --- Changes Since v3: - Mark XSTATE_ARCH_LBR_MASK as migratable in FEAT_XSAVE_XSS_LO. - Add TODO comment. --- target/i386/cpu.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 859cb889a37c..d2a89c03caec 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1484,6 +1484,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] =3D { .ecx =3D 1, .reg =3D R_ECX, }, + .migratable_flags =3D XSTATE_ARCH_LBR_MASK, }, [FEAT_XSAVE_XSS_HI] =3D { .type =3D CPUID_FEATURE_WORD, @@ -1522,7 +1523,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] =3D { .migratable_flags =3D XSTATE_FP_MASK | XSTATE_SSE_MASK | XSTATE_YMM_MASK | XSTATE_BNDREGS_MASK | XSTATE_BNDCSR_MASK | XSTATE_OPMASK_MASK | XSTATE_ZMM_Hi256_MASK | XSTATE_Hi16_ZMM_M= ASK | - XSTATE_PKRU_MASK, + XSTATE_PKRU_MASK | XSTATE_XTILE_CFG_MASK | XSTATE_XTILE_DATA_M= ASK, }, [FEAT_XSAVE_XCR0_HI] =3D { .type =3D CPUID_FEATURE_WORD, @@ -2154,8 +2155,13 @@ static uint64_t x86_cpu_get_migratable_flags(X86CPU = *cpu, FeatureWord w) for (i =3D 0; i < 64; i++) { uint64_t f =3D 1ULL << i; =20 - /* If the feature name is known, it is implicitly considered migra= table, - * unless it is explicitly set in unmigratable_flags */ + /* + * If the feature name is known, it is implicitly considered migra= table, + * unless it is explicitly set in unmigratable_flags. + * + * TODO: Make the behavior of x86_cpu_enable_xsave_components() al= ign + * with migratable_flags masking. + */ if ((wi->migratable_flags & f) || (wi->feat_names[i] && !(wi->unmigratable_flags & f))) { r |=3D f; --=20 2.34.1