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AJvYcCVWOT+JYC7i+hkThjmBawStQuY+6GNiTtackcXOz5X2KtJwqm2wUhQ7BTcbyU8ocfp1Sw7wxgi+H+zg20s=@vger.kernel.org X-Gm-Message-State: AOJu0Yyu50OESn+HQjmHQ899EpdER+XTVH/BROxRUsvsuebFIGq1pTBs wp0G/pq3h7+82f3UHT0q7ELreZEZFHJlKmqrTcrEXmzp7Jokc9VIo88nnZiPXrwKHQnI9XkcQVV 0UA== X-Google-Smtp-Source: AGHT+IF2N1obNYfDZfwu5m+pmo9znzxpNwbLxyRSQf9o3PYyvEV1svuRtClslNgdxG2L20PJVpMD0UgmoPI= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a65:6910:0:b0:7cd:712c:b65c with SMTP id 41be03b00d2f7-7cf54eb7a3amr5875a12.10.1724456879752; Fri, 23 Aug 2024 16:47:59 -0700 (PDT) Date: Fri, 23 Aug 2024 16:47:35 -0700 In-Reply-To: <20240808062937.1149-1-ravi.bangoria@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240808062937.1149-1-ravi.bangoria@amd.com> X-Mailer: git-send-email 2.46.0.295.g3b9ea8a38a-goog Message-ID: <172443900380.4130468.16617420818094069311.b4-ty@google.com> Subject: Re: [PATCH v4 0/4] x86/cpu: Add Bus Lock Detect support for AMD From: Sean Christopherson To: Sean Christopherson , tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, pbonzini@redhat.com, thomas.lendacky@amd.com, jmattson@google.com, Ravi Bangoria Cc: hpa@zytor.com, rmk+kernel@armlinux.org.uk, peterz@infradead.org, james.morse@arm.com, lukas.bulwahn@gmail.com, arjan@linux.intel.com, j.granados@samsung.com, sibs@chinatelecom.cn, nik.borisov@suse.com, michael.roth@amd.com, nikunj.dadhania@amd.com, babu.moger@amd.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, santosh.shukla@amd.com, ananth.narayan@amd.com, sandipan.das@amd.com, manali.shukla@amd.com Content-Type: text/plain; charset="utf-8" On Thu, 08 Aug 2024 06:29:33 +0000, Ravi Bangoria wrote: > Add Bus Lock Detect (called Bus Lock Trap in AMD docs) support for AMD > platforms. Bus Lock Detect is enumerated with CPUID Fn0000_0007_ECX_x0 > bit [24 / BUSLOCKTRAP]. It can be enabled through MSR_IA32_DEBUGCTLMSR. > When enabled, hardware clears DR6[11] and raises a #DB exception on > occurrence of Bus Lock if CPL > 0. More detail about the feature can be > found in AMD APM: > > [...] Applied patch 3 to kvm-x86 fixes, thanks! [3/4] KVM: SVM: Don't advertise Bus Lock Detect to guest if SVM support is missing https://github.com/kvm-x86/linux/commit/54950bfe2b69 -- https://github.com/kvm-x86/linux/tree/next