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AJvYcCWrZ+lo1ytjdt6g/FAmgq9ePaJy+x8s6EdDGz/3zCKuhIqb1/EmFLdPG1DnmKkbw6P39Tev+GsKDN2Tkd86PII1@lists.infradead.org X-Gm-Message-State: AOJu0YyzOceKbaZZzvRbb60wbMnRuNklIeS0Zxt4x/3+PoNSdLMnTt44 6CLs6s7lrs1TK+NC6vozvLavTb1qwxhYDWA6U01VIKeOk5n6NPG08xSTbj7VzlQnUJbPAfZS2w3 WVCpBg9Nadw== X-Google-Smtp-Source: AGHT+IFzj+UPbqIngfYZg8jfoSUOtJUbhZmymzy/LpsBgzX9feIS82Pp9ab/ElSPVxx+P987jYpoPGCk3MktKg== X-Received: from mostafa.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:333c]) (user=smostafa job=sendgmr) by 2002:a5b:b90:0:b0:e27:3e6a:345 with SMTP id 3f1490d57ef6-e2e3a6dd19amr1836276.10.1729703592399; Wed, 23 Oct 2024 10:13:12 -0700 (PDT) Date: Wed, 23 Oct 2024 17:12:43 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.47.0.105.g07ac214952-goog Message-ID: <20241023171244.4031151-1-smostafa@google.com> Subject: [PATCH] Documentation: Update the behaviour of "kvm-arm.mode" From: Mostafa Saleh To: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: corbet@lwn.net, Mostafa Saleh , Will Deacon , Marc Zyngier X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241023_181315_319734_30772148 X-CRM114-Status: GOOD ( 12.26 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Commit 5053c3f0519c ("KVM: arm64: Use hVHE in pKVM by default on CPUs with VHE support") modified the behaviour of "kvm-arm.mode=protected" without the updating the kernel parameters doc. Update it to match the current implementation. Cc: Will Deacon Cc: Marc Zyngier Signed-off-by: Mostafa Saleh --- Documentation/admin-guide/kernel-parameters.txt | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index bb48ae24ae69..59a0dd7e2de6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2723,8 +2723,12 @@ nvhe: Standard nVHE-based mode, without support for protected guests. - protected: nVHE-based mode with support for guests whose + protected: hVHE-based mode with support for guests whose state is kept private from the host. + In case hVHE is not supported in hardware, it will + boot with protected nVHE. + nVHE protected mode can still be forced on VHE systems + using "kvm_arm.mode=protected arm64_sw.hvhe=0 id_aa64mmfr1.vh=0" nested: VHE-based mode with support for nested virtualization. Requires at least ARMv8.3