linux-kernel - Re: [PATCH 5/7] KVM: TDX: Handle TDG.VP.VMCALL<ReportFatalError>

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Message-ID: <Z1LEe1VL2YvoCp0A@yilunxu-OptiPlex-7050>
Date: Fri, 6 Dec 2024 17:31:39 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: Binbin Wu <binbin.wu@...ux.intel.com>
Cc: pbonzini@...hat.com, seanjc@...gle.com, kvm@...r.kernel.org,
	rick.p.edgecombe@...el.com, kai.huang@...el.com,
	adrian.hunter@...el.com, reinette.chatre@...el.com,
	xiaoyao.li@...el.com, tony.lindgren@...ux.intel.com,
	isaku.yamahata@...el.com, yan.y.zhao@...el.com, chao.gao@...el.com,
	michael.roth@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] KVM: TDX: Handle TDG.VP.VMCALL<ReportFatalError>

> +static int tdx_report_fatal_error(struct kvm_vcpu *vcpu)
> +{
> +	u64 reg_mask = kvm_rcx_read(vcpu);
> +	u64* opt_regs;
> +
> +	/*
> +	 * Skip sanity checks and let userspace decide what to do if sanity
> +	 * checks fail.
> +	 */
> +	vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
> +	vcpu->run->system_event.type = KVM_SYSTEM_EVENT_TDX_FATAL;
> +	vcpu->run->system_event.ndata = 10;
> +	/* Error codes. */
> +	vcpu->run->system_event.data[0] = tdvmcall_a0_read(vcpu);
> +	/* GPA of additional information page. */
> +	vcpu->run->system_event.data[1] = tdvmcall_a1_read(vcpu);
> +	/* Information passed via registers (up to 64 bytes). */
> +	opt_regs = &vcpu->run->system_event.data[2];
> +
> +#define COPY_REG(REG, MASK)						\
> +	do {								\
> +		if (reg_mask & MASK)					\
> +			*opt_regs = kvm_ ## REG ## _read(vcpu);		\
> +		else							\
> +			*opt_regs = 0;					\
> +		opt_regs++;						\
> +	} while (0)
> +
> +	/* The order is defined in GHCI. */
> +	COPY_REG(r14, BIT_ULL(14));
> +	COPY_REG(r15, BIT_ULL(15));
> +	COPY_REG(rbx, BIT_ULL(3));
> +	COPY_REG(rdi, BIT_ULL(7));
> +	COPY_REG(rsi, BIT_ULL(6));
> +	COPY_REG(r8, BIT_ULL(8));
> +	COPY_REG(r9, BIT_ULL(9));
> +	COPY_REG(rdx, BIT_ULL(2));

Nit:

#undef COPY_REG

Thanks,
Yilun

> +
> +	/*
> +	 * Set the status code according to GHCI spec, although the vCPU may
> +	 * not return back to guest.
> +	 */
> +	tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_SUCCESS);
> +
> +	/* Forward request to userspace. */
> +	return 0;
> +}