From 92d6528dbb20c6aec4022dfd63c7ffee44f19f77 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Fri, 4 Feb 2022 16:55:06 +0000 Subject: [PATCH] target/arm: Support PAuth extension for hvf MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Currently we don't allow guests under hvf to use the PAuth extension, because we didn't have any special code to handle that, and therefore in arm_cpu_pauth_finalize() we will sanitize the ID_AA64ISAR1 value the guest sees to clear the PAuth related fields. Add support for this in the same way that KVM does it, by defaulting to "PAuth enabled" if the host CPU has it and allowing the user to disable it via '-cpu pauth=no' on the command line. Signed-off-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Andrew Jones Reviewed-by: Alexander Graf Reviewed-by: Richard Henderson Message-id: 20220204165506.2846058-7-peter.maydell@linaro.org --- target/arm/cpu64.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c index 19330d9ee9..1171ab16b9 100644 --- a/target/arm/cpu64.c +++ b/target/arm/cpu64.c @@ -633,9 +633,10 @@ void arm_cpu_pauth_finalize(ARMCPU *cpu, Error **errp) uint64_t t; /* Exit early if PAuth is enabled, and fall through to disable it */ - if (kvm_enabled() && cpu->prop_pauth) { + if ((kvm_enabled() || hvf_enabled()) && cpu->prop_pauth) { if (!cpu_isar_feature(aa64_pauth, cpu)) { - error_setg(errp, "'pauth' feature not supported by KVM on this host"); + error_setg(errp, "'pauth' feature not supported by %s on this host", + kvm_enabled() ? "KVM" : "hvf"); } return; @@ -672,10 +673,14 @@ void aarch64_add_pauth_properties(Object *obj) /* Default to PAUTH on, with the architected algorithm on TCG. */ qdev_property_add_static(DEVICE(obj), &arm_cpu_pauth_property); - if (kvm_enabled()) { + if (kvm_enabled() || hvf_enabled()) { /* * Mirror PAuth support from the probed sysregs back into the - * property for KVM. Is it just a bit backward? Yes it is! + * property for KVM or hvf. Is it just a bit backward? Yes it is! + * Note that prop_pauth is true whether the host CPU supports the + * architected QARMA5 algorithm or the IMPDEF one. We don't + * provide the separate pauth-impdef property for KVM or hvf, + * only for TCG. */ cpu->prop_pauth = cpu_isar_feature(aa64_pauth, cpu); } else { @@ -695,6 +700,7 @@ static void aarch64_host_initfn(Object *obj) #elif defined(CONFIG_HVF) ARMCPU *cpu = ARM_CPU(obj); hvf_arm_set_cpu_features_from_host(cpu); + aarch64_add_pauth_properties(obj); #else g_assert_not_reached(); #endif -- 2.11.0