From: "Huang, Kai" <kai.huang@intel.com>
To: "pbonzini@redhat.com" <pbonzini@redhat.com>,
"seanjc@google.com" <seanjc@google.com>,
"vkuznets@redhat.com" <vkuznets@redhat.com>,
"dwmw2@infradead.org" <dwmw2@infradead.org>,
"paul@xen.org" <paul@xen.org>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"yosry@kernel.org" <yosry@kernel.org>
Subject: Re: [PATCH 11/11] KVM: x86: Harden is_64_bit_hypercall() against bugs on 32-bit kernels
Date: Thu, 16 Apr 2026 01:43:32 +0000 [thread overview]
Message-ID: <1a48b8d66339d89a71ca0c978201ffd72d24ec99.camel@intel.com> (raw)
In-Reply-To: <20260409235622.2052730-12-seanjc@google.com>
On Thu, 2026-04-09 at 16:56 -0700, Sean Christopherson wrote:
> Unconditionally return %false for is_64_bit_hypercall() on 32-bit kernels
> to guard against incorrectly setting guest_state_protected, and because
> in a (very) hypothetical world where 32-bit KVM supports protected guests,
> assuming a hypercall was made in 64-bit mode is flat out wrong.
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
>
Reviewed-by: Kai Huang <kai.huang@intel.com>
prev parent reply other threads:[~2026-04-16 1:43 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-09 23:56 [PATCH 00/11] KVM: x86: Clean up kvm_<reg>_{read,write}() mess Sean Christopherson
2026-04-09 23:56 ` [PATCH 01/11] KVM: SVM: Truncate INVLPGA address in compatibility mode Sean Christopherson
2026-04-09 23:56 ` [PATCH 02/11] KVM: x86/xen: Bug the VM if 32-bit KVM observes a 64-bit mode hypercall Sean Christopherson
2026-04-09 23:56 ` [PATCH 03/11] KVM: x86/xen: Don't truncate RAX when handling hypercall from protected guest Sean Christopherson
2026-04-13 10:36 ` Binbin Wu
2026-04-15 21:29 ` Sean Christopherson
2026-04-09 23:56 ` [PATCH 04/11] KVM: VMX: Read 32-bit GPR values for ENCLS instructions outside of 64-bit mode Sean Christopherson
2026-04-13 12:19 ` Huang, Kai
2026-04-15 21:37 ` Sean Christopherson
2026-04-15 23:32 ` Huang, Kai
2026-04-16 0:27 ` Sean Christopherson
2026-04-16 1:40 ` Huang, Kai
2026-04-09 23:56 ` [PATCH 05/11] KVM: x86: Trace hypercall register *after* truncating values for 32-bit Sean Christopherson
2026-04-09 23:56 ` [PATCH 06/11] KVM: x86: Move kvm_<reg>_{read,write}() definitions to x86.h Sean Christopherson
2026-04-09 23:56 ` [PATCH 07/11] KVM: x86: Add mode-aware versions of kvm_<reg>_{read,write}() helpers Sean Christopherson
2026-04-14 8:26 ` Huang, Kai
2026-04-14 15:42 ` Sean Christopherson
2026-04-14 22:40 ` Huang, Kai
2026-04-14 9:02 ` Binbin Wu
2026-04-09 23:56 ` [PATCH 08/11] KVM: x86: Drop non-raw kvm_<reg>_write() helpers Sean Christopherson
2026-04-09 23:56 ` [PATCH 09/11] KVM: nSVM: Use kvm_rax_read() now that it's mode-aware Sean Christopherson
2026-04-09 23:56 ` [PATCH 10/11] Revert "KVM: VMX: Read 32-bit GPR values for ENCLS instructions outside of 64-bit mode" Sean Christopherson
2026-04-16 1:42 ` Huang, Kai
2026-04-09 23:56 ` [PATCH 11/11] KVM: x86: Harden is_64_bit_hypercall() against bugs on 32-bit kernels Sean Christopherson
2026-04-16 1:43 ` Huang, Kai [this message]
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