From: Binbin Wu <binbin.wu@linux.intel.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Kiryl Shutsemau <kas@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
Paul Durrant <paul@xen.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
kvm@vger.kernel.org, x86@kernel.org, linux-coco@lists.linux.dev,
linux-kernel@vger.kernel.org, Yosry Ahmed <yosry@kernel.org>,
Kai Huang <kai.huang@intel.com>
Subject: Re: [PATCH v2 08/15] KVM: x86: Add mode-aware versions of kvm_<reg>_{read,write}() helpers
Date: Fri, 15 May 2026 16:46:39 +0800 [thread overview]
Message-ID: <1e176571-17d4-480e-83a5-40b81519627c@linux.intel.com> (raw)
In-Reply-To: <20260514215355.1648463-9-seanjc@google.com>
On 5/15/2026 5:53 AM, Sean Christopherson wrote:
> Make kvm_<reg>_{read,write}() mode-aware (where the value is truncated to
> 32 bits if the vCPU isn't in 64-bit mode), and convert all the intentional
> "raw" accesses to kvm_<reg>_{read,write}_raw() versions. To avoid
> confusion and bikeshedding over whether or not explicit 32-bit accesses
> should use the "raw" or mode-aware variants, add and use "e" versions, e.g.
> for things like RDMSR, WRMSR, and CPUID, where the instruction uses only
> only bits 31:0, regardless of mode.
^
double "only"
>
> No functional change intended (all use of "e" versions is for cases where
> the value is already truncated due to bouncing through a u32).
>
> Cc: Binbin Wu <binbin.wu@linux.intel.com>
> Cc: Kai Huang <kai.huang@intel.com>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
next prev parent reply other threads:[~2026-05-15 8:46 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-14 21:53 [PATCH v2 00/15] KVM: x86: Clean up kvm_<reg>_{read,write}() mess Sean Christopherson
2026-05-14 21:53 ` [PATCH v2 01/15] KVM: SVM: Truncate INVLPGA address in compatibility mode Sean Christopherson
2026-05-15 6:36 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 02/15] KVM: x86/xen: Bug the VM if 32-bit KVM observes a 64-bit mode hypercall Sean Christopherson
2026-05-15 6:46 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 03/15] KVM: x86/xen: Don't truncate RAX when handling hypercall from protected guest Sean Christopherson
2026-05-15 7:21 ` Binbin Wu
2026-05-15 12:55 ` Sean Christopherson
2026-05-14 21:53 ` [PATCH v2 04/15] KVM: VMX: Read 32-bit GPR values for ENCLS instructions outside of 64-bit mode Sean Christopherson
2026-05-15 7:26 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 05/15] KVM: x86: Trace hypercall register *after* truncating values for 32-bit Sean Christopherson
2026-05-15 7:32 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 06/15] KVM: x86: Rename kvm_cache_regs.h => regs.h Sean Christopherson
2026-05-14 22:28 ` Yosry Ahmed
2026-05-15 7:45 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 07/15] KVM: x86: Move inlined CR and DR helpers from x86.h to regs.h Sean Christopherson
2026-05-14 22:30 ` Yosry Ahmed
2026-05-15 8:07 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 08/15] KVM: x86: Add mode-aware versions of kvm_<reg>_{read,write}() helpers Sean Christopherson
2026-05-15 8:46 ` Binbin Wu [this message]
2026-05-14 21:53 ` [PATCH v2 09/15] KVM: x86: Drop non-raw kvm_<reg>_write() helpers Sean Christopherson
2026-05-15 9:11 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 10/15] KVM: nSVM: Use kvm_rax_read() now that it's mode-aware Sean Christopherson
2026-05-14 21:53 ` [PATCH v2 11/15] Revert "KVM: VMX: Read 32-bit GPR values for ENCLS instructions outside of 64-bit mode" Sean Christopherson
2026-05-15 9:26 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 12/15] KVM: x86: Harden is_64_bit_hypercall() against bugs on 32-bit kernels Sean Christopherson
2026-05-15 9:31 ` Binbin Wu
2026-05-14 21:53 ` [PATCH v2 13/15] KVM: x86: Move update_cr8_intercept() to lapic.c Sean Christopherson
2026-05-14 21:53 ` [PATCH v2 14/15] KVM: x86: Move kvm_pv_async_pf_enabled() to x86.h (as an inline) Sean Christopherson
2026-05-14 21:53 ` [PATCH v2 15/15] KVM: x86: Move the bulk of register specific code from x86.c to regs.c Sean Christopherson
2026-05-14 22:31 ` [PATCH v2 00/15] KVM: x86: Clean up kvm_<reg>_{read,write}() mess Yosry Ahmed
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