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Peter Anvin" , x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, Vishal Annapurve References: <20260206222829.3758171-1-sagis@google.com> <20260206222829.3758171-2-sagis@google.com> <20260217180511.rvgsx7y45xfmrxvz@amd.com> From: Tom Lendacky Content-Language: en-US Autocrypt: addr=thomas.lendacky@amd.com; keydata= xsFNBFaNZYkBEADxg5OW/ajpUG7zgnUQPsMqWPjeAxtu4YH3lCUjWWcbUgc2qDGAijsLTFv1 kEbaJdblwYs28z3chM7QkfCGMSM29JWR1fSwPH18WyAA84YtxfPD8bfb1Exwo0CRw1RLRScn 6aJhsZJFLKyVeaPO1eequEsFQurRhLyAfgaH9iazmOVZZmxsGiNRJkQv4YnM2rZYi+4vWnxN 1ebHf4S1puN0xzQsULhG3rUyV2uIsqBFtlxZ8/r9MwOJ2mvyTXHzHdJBViOalZAUo7VFt3Fb aNkR5OR65eTL0ViQiRgFfPDBgkFCSlaxZvc7qSOcrhol160bK87qn0SbYLfplwiXZY/b/+ez 0zBtIt+uhZJ38HnOLWdda/8kuLX3qhGL5aNz1AeqcE5TW4D8v9ndYeAXFhQI7kbOhr0ruUpA udREH98EmVJsADuq0RBcIEkojnme4wVDoFt1EG93YOnqMuif76YGEl3iv9tYcESEeLNruDN6 LDbE8blkR3151tdg8IkgREJ+dK+q0p9UsGfdd+H7pni6Jjcxz8mjKCx6wAuzvArA0Ciq+Scg hfIgoiYQegZjh2vF2lCUzWWatXJoy7IzeAB5LDl/E9vz72cVD8CwQZoEx4PCsHslVpW6A/6U NRAz6ShU77jkoYoI4hoGC7qZcwy84mmJqRygFnb8dOjHI1KxqQARAQABzSZUb20gTGVuZGFj a3kgPHRob21hcy5sZW5kYWNreUBhbWQuY29tPsLBmQQTAQoAQwIbIwcLCQgHAwIBBhUIAgkK CwQWAgMBAh4BAheAAhkBFiEE3Vil58OMFCw3iBv13v+a5E8wTVMFAmkbaKgFCRZQah8ACgkQ 3v+a5E8wTVPFyg//UYANiuHfxxJET8D6p/vIV0xYcf1SXCG78M+5amqcE/4cCIJWyAT3A1nP zwyQIaIjUlGsXQtNgC1uVteCnMNJCjVQm0nLlJ9IVtXxzRg0QKjuSdZxuL5jrIon4xW9hTJR 94i2v3Fx5UWyP2TB6qZOcB0jgh0l01GHF9/DVJbmQlpvQB4Z1uNv09Q7En6EXi28TSv0Ffd1 p8vKqxwz7CMeAeZpn5i7s1QE/mQtdkyAmhuGD12tNbWzFamrDD1Kq3Em4TIFko0+k5+oQAAf JFaZc1c0D4GtXwvv4y+ssI0eZuOBXapUHeNNVf3JGuF6ZPLNPAe5gMQrmsJinEArVYRQCuDA BZakbKw9YJpGhnSVeCl2zSHcVgXuDs4J2ONxdsGynYv5cjPb4XTYPaE1CZH7Vy1tqma8eErG rcCyP1seloaC1UQcp8UDAyEaBjh3EqvTvgl+SppHz3im0gPJgR9km95BA8iGx9zqDuceATBc +A007+XxdFIsifMGlus0DKPmNAJaLkEEUMedBBxH3bwQ+z8tmWHisCZQJpUeGkwttD1LK/xn KRnu8AQpSJBB2oKAX1VtLRn8zLQdGmshxvsLUkKdrNE6NddhhfULqufNBqul0rrHGDdKdTLr cK5o2dsf9WlC4dHU2PiXP7RCjs1E5Ke0ycShDbDY5Zeep/yhNWLOwU0EVo1liQEQAL7ybY01 hvEg6pOh2G1Q+/ZWmyii8xhQ0sPjvEXWb5MWvIh7RxD9V5Zv144EtbIABtR0Tws7xDObe7bb r9nlSxZPur+JDsFmtywgkd778G0nDt3i7szqzcQPOcR03U7XPDTBJXDpNwVV+L8xvx5gsr2I bhiBQd9iX8kap5k3I6wfBSZm1ZgWGQb2mbiuqODPzfzNdKr/MCtxWEsWOAf/ClFcyr+c/Eh2 +gXgC5Keh2ZIb/xO+1CrTC3Sg9l9Hs5DG3CplCbVKWmaL1y7mdCiSt2b/dXE0K1nJR9ZyRGO lfwZw1aFPHT+Ay5p6rZGzadvu7ypBoTwp62R1o456js7CyIg81O61ojiDXLUGxZN/BEYNDC9 n9q1PyfMrD42LtvOP6ZRtBeSPEH5G/5pIt4FVit0Y4wTrpG7mjBM06kHd6V+pflB8GRxTq5M 7mzLFjILUl9/BJjzYBzesspbeoT/G7e5JqbiLWXFYOeg6XJ/iOCMLdd9RL46JXYJsBZnjZD8 Rn6KVO7pqs5J9K/nJDVyCdf8JnYD5Rq6OOmgP/zDnbSUSOZWrHQWQ8v3Ef665jpoXNq+Zyob pfbeihuWfBhprWUk0P/m+cnR2qeE4yXYl4qCcWAkRyGRu2zgIwXAOXCHTqy9TW10LGq1+04+ LmJHwpAABSLtr7Jgh4erWXi9mFoRABEBAAHCwXwEGAEKACYCGwwWIQTdWKXnw4wULDeIG/Xe /5rkTzBNUwUCaRto5wUJFlBqXgAKCRDe/5rkTzBNUw4/EAClG106SeHXiJ+ka6aeHysDNVgZ 8pUbB2f8dWI7kzD5AZ5kLENnsi1MzJRYBwtg/vVVorZh6tavUwcIvsao+TnV57gXAWr6sKIc xyipxRVEXmHts22I6vL1DirLAoOLAwWilkM+JzbVE3MMvC+cCVnMzzchrMYDTqn1mjCCwiIe u5oop+K/RgeHYPsraumyA9/kj8iazrLM+lORukCNM7+wlRClcY8TGX+VllANym9B6FMxsJ5z Q7JeeXIgyGlcBRME+m3g40HfIl+zM674gjv2Lk+KjS759KlX27mQfgnAPX4tnjLcmpSQJ77I Qg+Azi/Qloiw7L/WsmxEO5ureFgGIYDQQUeM1Qnk76K5Z3Nm8MLHtjw3Q7kXHrbYn7tfWh4B 7w5Lwh6NoF88AGpUrosARVvIAd93oo0B9p40Or4c5Jao1qqsmmCCD0dl7WTJCboYTa2OWd99 oxS7ujw2t1WMPD0cmriyeaFZnT5cjGbhkA+uQGuT0dMQJdLqW3HRwWxyiGU/jZUFjHGFmUrj qFAgP+x+ODm6/SYn0LE0VLbYuEGfyx5XcdNnSvww1NLUxSvuShcJMII0bSgP3+KJtFqrUx9z l+/NCGvn/wMy6NpYUpRSOmsqVv0N71LbtXnHRrJ42LzWiRW2I5IWsb1TfdMAyVToHPNaEb0i WiyqywZI5g== In-Reply-To: <20260217180511.rvgsx7y45xfmrxvz@amd.com> Content-Type: text/plain; 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For example: in the case of intrahost migration >> userspace might decide to continue the MAPGPA operation after the >> migration is completed. >> >> Allow userspace to signal to TDX guests that the MAPGPA operation should >> be retried the next time the guest is scheduled. >> >> This is potentially a breaking change since if userspace sets >> hypercall.ret to a value other than EBUSY or EINVAL an EINVAL error code >> will be returned to userspace. As of now QEMU never sets hypercall.ret >> to a non-zero value after handling KVM_EXIT_HYPERCALL so this change >> should be safe. >> >> Signed-off-by: Vishal Annapurve >> Co-developed-by: Sagi Shahar >> Signed-off-by: Sagi Shahar >> --- >> Documentation/virt/kvm/api.rst | 3 +++ >> arch/x86/kvm/vmx/tdx.c | 15 +++++++++++++-- >> arch/x86/kvm/x86.h | 6 ++++++ >> 3 files changed, 22 insertions(+), 2 deletions(-) >> >> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst >> index 01a3abef8abb..9978cd9d897e 100644 >> --- a/Documentation/virt/kvm/api.rst >> +++ b/Documentation/virt/kvm/api.rst >> @@ -8679,6 +8679,9 @@ block sizes is exposed in KVM_CAP_ARM_SUPPORTED_BLOCK_SIZES as a >> >> This capability, if enabled, will cause KVM to exit to userspace >> with KVM_EXIT_HYPERCALL exit reason to process some hypercalls. >> +Userspace may fail the hypercall by setting hypercall.ret to EINVAL >> +or may request the hypercall to be retried the next time the guest run >> +by setting hypercall.ret to EAGAIN. >> >> Calling KVM_CHECK_EXTENSION for this capability will return a bitmask >> of hypercalls that can be configured to exit to userspace. >> diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c >> index 2d7a4d52ccfb..056a44b9d78b 100644 >> --- a/arch/x86/kvm/vmx/tdx.c >> +++ b/arch/x86/kvm/vmx/tdx.c >> @@ -1186,10 +1186,21 @@ static void __tdx_map_gpa(struct vcpu_tdx *tdx); >> >> static int tdx_complete_vmcall_map_gpa(struct kvm_vcpu *vcpu) >> { >> + u64 hypercall_ret = READ_ONCE(vcpu->run->hypercall.ret); >> struct vcpu_tdx *tdx = to_tdx(vcpu); >> >> - if (vcpu->run->hypercall.ret) { >> - tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_INVALID_OPERAND); >> + if (hypercall_ret) { >> + if (hypercall_ret == EAGAIN) { >> + tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_RETRY); >> + } else if (vcpu->run->hypercall.ret == EINVAL) { >> + tdvmcall_set_return_code( >> + vcpu, TDVMCALL_STATUS_INVALID_OPERAND); >> + } else { >> + WARN_ON_ONCE( >> + kvm_is_valid_map_gpa_range_ret(hypercall_ret)); >> + return -EINVAL; >> + } >> + >> tdx->vp_enter_args.r11 = tdx->map_gpa_next; >> return 1; >> } > > Maybe slightly more readable? > > switch (hypercall_ret) { > case EAGAIN: > tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_RETRY); > /* fallthrough */ I think you want a break here, not a fallthrough, so that you don't set the return code twice with the last one not being correct for EAGAIN. Thanks, Tom > case EINVAL: > tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_INVALID_OPERAND); > /* fallthrough */ > case 0: > break; > case default: > WARN_ON_ONCE(kvm_is_valid_map_gpa_range_ret(hypercall_ret)); > return -EINVAL; > } > > tdx->vp_enter_args.r11 = tdx->map_gpa_next; > return 1; > > Either way: > > Reviewed-by: Michael Roth > >> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h >> index fdab0ad49098..3d464d12423a 100644 >> --- a/arch/x86/kvm/x86.h >> +++ b/arch/x86/kvm/x86.h >> @@ -706,6 +706,12 @@ int kvm_sev_es_string_io(struct kvm_vcpu *vcpu, unsigned int size, >> unsigned int port, void *data, unsigned int count, >> int in); >> >> +static inline bool kvm_is_valid_map_gpa_range_ret(u64 hypercall_ret) >> +{ >> + return !hypercall_ret || hypercall_ret == EINVAL || >> + hypercall_ret == EAGAIN; >> +} >> + >> static inline bool user_exit_on_hypercall(struct kvm *kvm, unsigned long hc_nr) >> { >> return kvm->arch.hypercall_exit_enabled & BIT(hc_nr); >> -- >> 2.53.0.rc2.204.g2597b5adb4-goog >>