mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-06 04:19:23 -04:00
a33ba1bf0d
Open code setting "vcpu->arch.pat" in vmx_set_msr() instead of bouncing through kvm_set_msr_common() to get to the same code in kvm_mtrr_set_msr(). This aligns VMX with SVM, avoids hiding a very simple operation behind a relatively complicated function call (finding the PAT MSR case in kvm_set_msr_common() is non-trivial), and most importantly, makes it clear that not unwinding the VMCS updates if kvm_set_msr_common() isn't a bug (because kvm_set_msr_common() can never fail for PAT). Opportunistically set vcpu->arch.pat before updating the VMCS info so that a future patch can move the common bits (back) into kvm_set_msr_common() without a functional change. Note, MSR_IA32_CR_PAT is 0x277, and is very subtly handled by case 0x200 ... MSR_IA32_MC0_CTL2 - 1: in kvm_set_msr_common(). Cc: Kai Huang <kai.huang@intel.com> Signed-off-by: Wenyao Hai <haiwenyao@uniontech.com> [sean: massage changelog, hoist setting vcpu->arch.pat up] Reviewed-by: Kai Huang <kai.huang@intel.com> Link: https://lore.kernel.org/r/20230511233351.635053-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.