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From: Francesco Lavra <francescolavra.fl@gmail.com>
To: zack.rusin@broadcom.com
Cc: bp@alien8.de, dave.hansen@linux.intel.com,
	doug.covelli@broadcom.com,  hpa@zytor.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, mingo@redhat.com,
	 pbonzini@redhat.com, seanjc@google.com, tglx@linutronix.de,
	x86@kernel.org
Subject: Re: [PATCH v2 1/5] KVM: x86: Centralize KVM's VMware code
Date: Tue, 22 Apr 2025 18:58:10 +0200	[thread overview]
Message-ID: <75aa80eeecb66050d80c2c6a793c6c20fab22a0f.camel@gmail.com> (raw)
In-Reply-To: <20250422161304.579394-2-zack.rusin@broadcom.com>

On 2025-04-22 at 16:12, Zack Rusin wrote:
> Centralize KVM's VMware specific code and introduce CONFIG_KVM_VMWARE
> to
> isolate all of it.
> 
> Code used to support VMware backdoor has been scattered around the
> KVM
> codebase making it difficult to reason about, maintain it and change
> it. Introduce CONFIG_KVM_VMWARE which, much like CONFIG_KVM_XEN and
> CONFIG_KVM_VMWARE for Xen and Hyper-V, abstracts away VMware specific

s/CONFIG_KVM_VMWARE/CONFIG_KVM_HYPERV/

> +static inline bool kvm_vmware_is_backdoor_opcode(u8 opcode_len, u8
> b)
> +{
> +	switch (opcode_len) {
> +	case 1:
> +		switch (b) {
> +		case 0xe4:	/* IN */
> +		case 0xe5:
> +		case 0xec:
> +		case 0xed:
> +		case 0xe6:	/* OUT */
> +		case 0xe7:
> +		case 0xee:
> +		case 0xef:
> +		case 0x6c:	/* INS */
> +		case 0x6d:
> +		case 0x6e:	/* OUTS */
> +		case 0x6f:
> +			return true;
> +		}
> +		break;
> +	case 2:
> +		switch (b) {
> +		case 0x33:	/* RDPMC */
> +			return true;
> +		}
> +		break;
> +	}
> +
> +	return false;
> +}
> +
> +#else /* !CONFIG_KVM_VMWARE */
> +
> +static inline bool kvm_vmware_backdoor_enabled(struct kvm_vcpu
> *vcpu)
> +{
> +	return false;
> +}
> +
> +static inline bool kvm_vmware_is_backdoor_pmc(u32 pmc_idx)
> +{
> +	return false;
> +}
> +
> +static inline bool kvm_vmware_io_port_allowed(u16 port)
> +{
> +	return false;
> +}
> +
> +static inline int kvm_vmware_pmu_rdpmc(struct kvm_vcpu *vcpu, u32
> idx, u64 *data)
> +{
> +	return 0;
> +}
> +
> +static inline bool kvm_vmware_is_backdoor_opcode(u8 opcode_len, u8
> len)

Nit: even though this is just a dummy function, its second parameter
`len` appears misnamed and for consistency should be named the same as
in the CONFIG_KVM_VMWARE function, i.e. `b`.

  reply	other threads:[~2025-04-22 16:58 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-04-22 16:12 [PATCH v2 0/5] KVM: Improve VMware guest support Zack Rusin
2025-04-22 16:12 ` [PATCH v2 1/5] KVM: x86: Centralize KVM's VMware code Zack Rusin
2025-04-22 16:58   ` Francesco Lavra [this message]
2025-07-23 17:48   ` Sean Christopherson
     [not found]     ` <CABQX2QMj=7HnTqCsKHpcypyfNsMYumYM7NH_jpUvMbgbTH=ZXg@mail.gmail.com>
2025-07-23 18:55       ` Sean Christopherson
2025-04-22 16:12 ` [PATCH v2 2/5] KVM: x86: Allow enabling of the vmware backdoor via a cap Zack Rusin
2025-07-23 18:06   ` Sean Christopherson
2025-04-22 16:12 ` [PATCH v2 3/5] KVM: x86: Add support for VMware guest specific hypercalls Zack Rusin
2025-07-23 18:14   ` Sean Christopherson
2025-04-22 16:12 ` [PATCH v2 4/5] KVM: x86: Add support for legacy VMware backdoors in nested setups Zack Rusin
2025-04-23  7:56   ` Xin Li
2025-04-23 11:43     ` Zack Rusin
2025-04-23 13:31       ` Sean Christopherson
2025-04-23 15:36         ` Zack Rusin
2025-04-23 15:54           ` Sean Christopherson
2025-04-23 16:58             ` Zack Rusin
2025-04-23 17:16               ` Sean Christopherson
2025-04-23 17:25                 ` Zack Rusin
2025-04-23 18:57                   ` Sean Christopherson
2025-04-23 20:01                     ` Zack Rusin
2025-07-23 18:19   ` Sean Christopherson
2025-04-22 16:12 ` [PATCH v2 5/5] KVM: selftests: x86: Add a test for KVM_CAP_X86_VMWARE_HYPERCALL Zack Rusin
2025-07-23 18:21   ` Sean Christopherson

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