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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=b1GzwnCIgYQQs2+eR9/+9fjYiOWtIpDw6y8LuSnDjMIiLjQHdu5atNFwFgGCYIJ+j l5J+gBR5cA/nsADAwKWhgtXV7rOqgXHBlEjotdPLOeRX04XhLrqJyO/OtH/K20c/7F qZ8iJpiK1dbKyp1Ewus7a4mR2rE1+w9l+s0iLZJ/Xyyd9RjEFx2Uh0cZh406qhdUYJ kpSGIA2Ho56YA2gZAlBs1v8aIYQCnXshL60iUtmt3vzV3Btpc7SBuevH1LsxnrHG39 auAMZ7UeqEmn8b0XVrwTqWr1KU7UT+9UcXUe+iCc9uSLX6SiHrEwvEHMWDIk4FkNr+ 9td15WLkLNxtw== Message-ID: <06d93a19-ebc1-418b-becd-225caac76baf@zytor.com> Date: Fri, 13 Jun 2025 14:38:35 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 1/3] x86/traps: Move DR7_RESET_VALUE to To: Sean Christopherson Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, pbonzini@redhat.com, peterz@infradead.org, brgerst@gmail.com, tony.luck@intel.com, fenghuay@nvidia.com References: <20250613070118.3694407-1-xin@zytor.com> <20250613070118.3694407-2-xin@zytor.com> <00358cf3-e59a-4a5f-8cfd-06a174da72b4@zytor.com> Content-Language: en-US From: Xin Li Autocrypt: addr=xin@zytor.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 6/13/2025 1:03 PM, Sean Christopherson wrote: > On Fri, Jun 13, 2025, Xin Li wrote: >> On 6/13/2025 7:18 AM, Sean Christopherson wrote: >>> On Fri, Jun 13, 2025, Xin Li (Intel) wrote: >>>> Move DR7_RESET_VALUE to to prepare to write DR7 >>>> with DR7_RESET_VALUE at boot time. >>> >>> Alternatively, what about dropping DR7_RESET_VALUE, moving KVM's DR6 and DR7 >>> #defines out of arch/x86/include/asm/kvm_host.h, and then using DR7_FIXED_1? >> >> We definitely should do it, I see quite a few architectural definitions >> are in KVM only headers (the native FRED patches needed to reuse the event >> types that were previously VMX-specific and moved them out of KVM >> headers). >> >> Because there is an UAPI header, we probably don't want to remove >> definitions from it? > > What #defines are in which uapi header? arch/x86/include/uapi/asm/debugreg.h has: #define DR_BUS_LOCK (0x800) /* bus_lock */ #define DR_STEP (0x4000) /* single-step */ #define DR_SWITCH (0x8000) /* task switch */ And arch/x86/include/asm/kvm_host.h also has: #define DR6_BUS_LOCK (1 << 11) #define DR6_BD (1 << 13) #define DR6_BS (1 << 14) #define DR6_BT (1 << 15) #define DR6_RTM (1 << 16) Duplicated definitions for the same DR6 bits.