linux-kernel - Re: [PATCH v4 0/4] x86/cpu: Add Bus Lock Detect support for AMD

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Message-ID: <172443900380.4130468.16617420818094069311.b4-ty@google.com>
Date: Fri, 23 Aug 2024 16:47:35 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, 
	dave.hansen@...ux.intel.com, pbonzini@...hat.com, thomas.lendacky@....com, 
	jmattson@...gle.com, Ravi Bangoria <ravi.bangoria@....com>
Cc: hpa@...or.com, rmk+kernel@...linux.org.uk, peterz@...radead.org, 
	james.morse@....com, lukas.bulwahn@...il.com, arjan@...ux.intel.com, 
	j.granados@...sung.com, sibs@...natelecom.cn, nik.borisov@...e.com, 
	michael.roth@....com, nikunj.dadhania@....com, babu.moger@....com, 
	x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	santosh.shukla@....com, ananth.narayan@....com, sandipan.das@....com, 
	manali.shukla@....com
Subject: Re: [PATCH v4 0/4] x86/cpu: Add Bus Lock Detect support for AMD

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