From: Zhao Liu <zhao1.liu@intel.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Shan Kang <shan.kang@intel.com>, Kai Huang <kai.huang@intel.com>,
Xin Li <xin3.li@intel.com>
Subject: Re: [PATCH v6 5/9] KVM: VMX: Track CPU's MSR_IA32_VMX_BASIC as a single 64-bit value
Date: Fri, 15 Mar 2024 23:26:46 +0800 [thread overview]
Message-ID: <ZfRotvcaNUft4H4/@intel.com> (raw)
In-Reply-To: <20240309012725.1409949-6-seanjc@google.com>
Hi Sean,
On Fri, Mar 08, 2024 at 05:27:21PM -0800, Sean Christopherson wrote:
> Date: Fri, 8 Mar 2024 17:27:21 -0800
> From: Sean Christopherson <seanjc@google.com>
> Subject: [PATCH v6 5/9] KVM: VMX: Track CPU's MSR_IA32_VMX_BASIC as a
> single 64-bit value
> X-Mailer: git-send-email 2.44.0.278.ge034bb2e1d-goog
>
> Track the "basic" capabilities VMX MSR as a single u64 in vmcs_config
> instead of splitting it across three fields, that obviously don't combine
> into a single 64-bit value, so that KVM can use the macros that define MSR
> bits using their absolute position. Replace all open coded shifts and
> masks, many of which are relative to the "high" half, with the appropriate
> macro.
>
> Opportunistically use VMX_BASIC_32BIT_PHYS_ADDR_ONLY instead of an open
> coded equivalent, and clean up the related comment to not reference a
> specific SDM section (to the surprise of no one, the comment is stale).
>
> No functional change intended (though obviously the code generation will
> be quite different).
>
> Cc: Shan Kang <shan.kang@intel.com>
> Cc: Kai Huang <kai.huang@intel.com>
> Signed-off-by: Xin Li <xin3.li@intel.com>
> [sean: split to separate patch, write changelog]
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
> arch/x86/include/asm/vmx.h | 5 +++++
> arch/x86/kvm/vmx/capabilities.h | 6 ++----
> arch/x86/kvm/vmx/vmx.c | 28 ++++++++++++++--------------
> 3 files changed, 21 insertions(+), 18 deletions(-)
>
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index c3a97dca4a33..ce6d166fc3c5 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -150,6 +150,11 @@ static inline u32 vmx_basic_vmcs_size(u64 vmx_basic)
> return (vmx_basic & GENMASK_ULL(44, 32)) >> 32;
Maybe we could use VMX_BASIC_VMCS_SIZE_SHIFT to replace "32"?
> }
>
> +static inline u32 vmx_basic_vmcs_mem_type(u64 vmx_basic)
> +{
> + return (vmx_basic & GENMASK_ULL(53, 50)) >> 50;
> +}
> +
Also here, we can use VMX_BASIC_MEM_TYPE_SHIFT to replace "50".
And what about defining VMX_BASIC_MEM_TYPE_MASK to replace
GENMASK_ULL(53, 50), and VMX_BASIC_VMCS_SIZE_MSAK to replace
GENMASK_ULL(44, 32) above?
Thanks,
Zhao
next prev parent reply other threads:[~2024-03-15 15:12 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-09 1:27 [PATCH v6 0/9] x86/cpu: KVM: Clean up PAT and VMX macros Sean Christopherson
2024-03-09 1:27 ` [PATCH v6 1/9] x86/cpu: KVM: Add common defines for architectural memory types (PAT, MTRRs, etc.) Sean Christopherson
2024-03-27 11:13 ` Huang, Kai
2024-04-03 18:57 ` Sean Christopherson
2024-04-03 21:17 ` Huang, Kai
2024-04-03 21:42 ` Sean Christopherson
2024-03-09 1:27 ` [PATCH v6 2/9] x86/cpu: KVM: Move macro to encode PAT value to common header Sean Christopherson
2024-03-27 11:21 ` Huang, Kai
2024-04-01 5:28 ` Xiaoyao Li
2024-04-03 21:03 ` Huang, Kai
2024-03-09 1:27 ` [PATCH v6 3/9] KVM: x86: Stuff vCPU's PAT with default value at RESET, not creation Sean Christopherson
2024-03-27 11:22 ` Huang, Kai
2024-04-01 6:00 ` Xiaoyao Li
2024-03-09 1:27 ` [PATCH v6 4/9] KVM: VMX: Move MSR_IA32_VMX_BASIC bit defines to asm/vmx.h Sean Christopherson
2024-03-15 15:13 ` Zhao Liu
2024-03-27 10:37 ` Huang, Kai
2024-04-01 6:13 ` Xiaoyao Li
2024-04-02 5:01 ` Li, Xin3
2024-04-02 14:28 ` Sean Christopherson
2024-03-09 1:27 ` [PATCH v6 5/9] KVM: VMX: Track CPU's MSR_IA32_VMX_BASIC as a single 64-bit value Sean Christopherson
2024-03-15 15:26 ` Zhao Liu [this message]
2024-03-27 10:38 ` Huang, Kai
2024-04-01 6:27 ` Xiaoyao Li
2024-03-09 1:27 ` [PATCH v6 6/9] KVM: nVMX: Use macros and #defines in vmx_restore_vmx_basic() Sean Christopherson
2024-03-15 15:30 ` Zhao Liu
2024-03-27 10:53 ` Huang, Kai
2024-04-01 7:00 ` Xiaoyao Li
2024-03-09 1:27 ` [PATCH v6 7/9] KVM VMX: Move MSR_IA32_VMX_MISC bit defines to asm/vmx.h Sean Christopherson
2024-03-15 15:43 ` Zhao Liu
2024-03-27 10:55 ` Huang, Kai
2024-03-09 1:27 ` [PATCH v6 8/9] KVM: VMX: Open code VMX preemption timer rate mask in its accessor Sean Christopherson
2024-03-15 15:46 ` Zhao Liu
2024-03-15 17:54 ` Sean Christopherson
2024-04-01 7:07 ` Xiaoyao Li
2024-04-02 22:06 ` Sean Christopherson
2024-04-24 20:06 ` Sean Christopherson
2024-04-25 10:05 ` Huang, Kai
2024-04-25 14:42 ` Sean Christopherson
2024-04-25 21:44 ` Huang, Kai
2024-04-25 14:18 ` Xiaoyao Li
2024-03-27 10:59 ` Huang, Kai
2024-03-09 1:27 ` [PATCH v6 9/9] KVM: nVMX: Use macros and #defines in vmx_restore_vmx_misc() Sean Christopherson
2024-03-15 15:52 ` Zhao Liu
2024-03-27 11:02 ` Huang, Kai
2024-04-01 7:09 ` Xiaoyao Li
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