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[PATCH 6/6] target/arm: Support PAuth extension for hvf
From: |
Peter Maydell |
Subject: |
[PATCH 6/6] target/arm: Support PAuth extension for hvf |
Date: |
Fri, 4 Feb 2022 16:55:06 +0000 |
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 <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 fd611c97116..5be5ade6c9d 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
--
2.25.1
- [PATCH 0/6] target/arm: -cpu host/max KVM and HVF fixes, Peter Maydell, 2022/02/04
- [PATCH 1/6] target/arm: Move '-cpu host' code to cpu64.c, Peter Maydell, 2022/02/04
- [PATCH 3/6] target/arm: Make KVM -cpu max exactly like -cpu host, Peter Maydell, 2022/02/04
- [PATCH 2/6] target/arm: Use aarch64_cpu_register() for 'host' CPU type, Peter Maydell, 2022/02/04
- [PATCH 6/6] target/arm: Support PAuth extension for hvf,
Peter Maydell <=
- [PATCH 4/6] target/arm: Unindent unnecessary else-clause, Peter Maydell, 2022/02/04
- [PATCH 5/6] target/arm: Fix '-cpu max' for HVF, Peter Maydell, 2022/02/04
- Re: [PATCH 0/6] target/arm: -cpu host/max KVM and HVF fixes, Philippe Mathieu-Daudé, 2022/02/06
- Re: [PATCH 0/6] target/arm: -cpu host/max KVM and HVF fixes, Andrew Jones, 2022/02/09
- Re: [PATCH 0/6] target/arm: -cpu host/max KVM and HVF fixes, Alexander Graf, 2022/02/09