From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Sean Christopherson <seanjc@google.com>,
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>
Cc: 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 9/9] KVM: nVMX: Use macros and #defines in vmx_restore_vmx_misc()
Date: Mon, 1 Apr 2024 15:09:03 +0800 [thread overview]
Message-ID: <329c7188-bd24-4200-9934-ff4a07fa1c61@intel.com> (raw)
In-Reply-To: <20240309012725.1409949-10-seanjc@google.com>
On 3/9/2024 9:27 AM, Sean Christopherson wrote:
> From: Xin Li <xin3.li@intel.com>
>
> Use macros in vmx_restore_vmx_misc() instead of open coding everything
> using BIT_ULL() and GENMASK_ULL(). Opportunistically split feature bits
> and reserved bits into separate variables, and add a comment explaining
> the subset logic (it's not immediately obvious that the set of feature
> bits is NOT the set of _supported_ feature bits).
>
> 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, drop #defines]
> Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
> ---
> arch/x86/kvm/vmx/nested.c | 27 ++++++++++++++++++++-------
> 1 file changed, 20 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 06512ee7a5c4..6610d258c680 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -1322,16 +1322,29 @@ vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
>
> static int vmx_restore_vmx_misc(struct vcpu_vmx *vmx, u64 data)
> {
> - const u64 feature_and_reserved_bits =
> - /* feature */
> - BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) | BIT_ULL(15) |
> - BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30) |
> - /* reserved */
> - GENMASK_ULL(13, 9) | BIT_ULL(31);
> + const u64 feature_bits = VMX_MISC_SAVE_EFER_LMA |
> + VMX_MISC_ACTIVITY_HLT |
> + VMX_MISC_ACTIVITY_SHUTDOWN |
> + VMX_MISC_ACTIVITY_WAIT_SIPI |
> + VMX_MISC_INTEL_PT |
> + VMX_MISC_RDMSR_IN_SMM |
> + VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
> + VMX_MISC_VMXOFF_BLOCK_SMI |
> + VMX_MISC_ZERO_LEN_INS;
> +
> + const u64 reserved_bits = BIT_ULL(31) | GENMASK_ULL(13, 9);
> +
> u64 vmx_misc = vmx_control_msr(vmcs_config.nested.misc_low,
> vmcs_config.nested.misc_high);
>
> - if (!is_bitwise_subset(vmx_misc, data, feature_and_reserved_bits))
> + BUILD_BUG_ON(feature_bits & reserved_bits);
> +
> + /*
> + * The incoming value must not set feature bits or reserved bits that
> + * aren't allowed/supported by KVM. Fields, i.e. multi-bit values, are
> + * explicitly checked below.
> + */
> + if (!is_bitwise_subset(vmx_misc, data, feature_bits | reserved_bits))
> return -EINVAL;
>
> if ((vmx->nested.msrs.pinbased_ctls_high &
prev parent reply other threads:[~2024-04-01 7:09 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
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 [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=329c7188-bd24-4200-9934-ff4a07fa1c61@intel.com \
--to=xiaoyao.li@intel.com \
--cc=bp@alien8.de \
--cc=dave.hansen@linux.intel.com \
--cc=kai.huang@intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mingo@redhat.com \
--cc=pbonzini@redhat.com \
--cc=peterz@infradead.org \
--cc=seanjc@google.com \
--cc=shan.kang@intel.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
--cc=xin3.li@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).