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[82.218.84.190]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5cee6a9a41bsm1467773a12.14.2024.11.05.08.00.52 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 05 Nov 2024 08:00:52 -0800 (PST) From: Phil Dennis-Jordan To: qemu-devel@nongnu.org Cc: dirty@apple.com, rbolshakov@ddn.com, pbonzini@redhat.com, Phil Dennis-Jordan Subject: [PATCH 0/5] i386/hvf: x2apic support and some small fixes Date: Tue, 5 Nov 2024 16:57:55 +0100 Message-Id: <20241105155800.5461-1-phil@philjordan.eu> X-Mailer: git-send-email 2.39.3 (Apple Git-145) MIME-Version: 1.0 Received-SPF: neutral client-ip=2a00:1450:4864:20::52f; envelope-from=phil@philjordan.eu; helo=mail-ed1-x52f.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779 autolearn=no 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This is a loose collection of patches against the x86 hvf accel. They can be applied/pulled independently from one another. Patch 1 is a repost of a patch I've submitted a bunch of times already. It wires up and enables x2APIC mode in conjunction with HVF - the software APIC implementation in QEMU gained the feature earlier this year but hvf wasn't included. The change typically improves performance with modern SMP guest OSes by a 2-digit percentage. (Exact values depend on workload.) Patch 2 fixes cases of undefined behaviour recently introduced by commit 7cac7aa which made changes to HVF CPUID XSAVE functionality. Patch 3 fixes a minor one-off memory leak during hvf startup. Patch 4 ever so slightly improves APIC correctness under hvf: when setting the APICBASE MSR, if the APIC deems the new value invalid, we raise an exception (as per spec) rather than silently doing nothing. This fixes a failing kvm-unit-tests test case. Patch 5 removes some unnecessary duplication and type-rechecking in HVF's inner loop. (No need to cast the cpu state pointer to X86CPU within, the hvf_vcp_exec function already does that once at the top.) Some of this work has been sponsored by Sauce Labs Inc. Phil Dennis-Jordan (5): i386/hvf: Integrates x2APIC support with hvf accel i386/hvf: Fix for UB in handling CPUID function 0xD i386/hvf: Fixes startup memory leak (vmcs caps) i386/hvf: Raise exception on error setting APICBASE i386/hvf: Removes duplicate/shadowed variables in hvf_vcpu_exec target/i386/hvf/hvf.c | 7 +++---- target/i386/hvf/x86_cpuid.c | 6 +++--- target/i386/hvf/x86_emu.c | 42 +++++++++++++++++++++++++++++++++++-- 3 files changed, 46 insertions(+), 9 deletions(-)