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The new header is intended to be used by drivers using the backdoor. Follow the KVM example using alternatives self-patching to choose between vmcall, vmmcall and io instructions. Also define two new CPU feature flags to indicate hypervisor support for vmcall- and vmmcall instructions. The new XF86_FEATURE_VMW_VMMCALL flag is needed because using XF86_FEATURE_VMMCALL might break QEMU/KVM setups using the vmmouse driver. They rely on XF86_FEATURE_VMMCALL on AMD to get the kvm_hypercall() right. But they do not yet implement vmmcall for the VMware hypercall used by the vmmouse driver. [ bp: reflow hypercall %edx usage explanation comment. ] Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Doug Covelli <dcovelli@vmware.com> Cc: Aaron Lewis <aaronlewis@google.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: linux-graphics-maintainer@vmware.com Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Robert Hoo <robert.hu@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Cc: <pv-drivers@vmware.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190828080353.12658-3-thomas_os@shipmail.org
54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 or MIT */
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#ifndef _ASM_X86_VMWARE_H
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#define _ASM_X86_VMWARE_H
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#include <asm/cpufeatures.h>
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#include <asm/alternative.h>
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/*
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* The hypercall definitions differ in the low word of the %edx argument
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* in the following way: the old port base interface uses the port
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* number to distinguish between high- and low bandwidth versions.
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*
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* The new vmcall interface instead uses a set of flags to select
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* bandwidth mode and transfer direction. The flags should be loaded
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* into %dx by any user and are automatically replaced by the port
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* number if the VMWARE_HYPERVISOR_PORT method is used.
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*
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* In short, new driver code should strictly use the new definition of
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* %dx content.
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*/
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/* Old port-based version */
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#define VMWARE_HYPERVISOR_PORT "0x5658"
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#define VMWARE_HYPERVISOR_PORT_HB "0x5659"
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/* Current vmcall / vmmcall version */
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#define VMWARE_HYPERVISOR_HB BIT(0)
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#define VMWARE_HYPERVISOR_OUT BIT(1)
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/* The low bandwidth call. The low word of edx is presumed clear. */
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#define VMWARE_HYPERCALL \
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ALTERNATIVE_2("movw $" VMWARE_HYPERVISOR_PORT ", %%dx; inl (%%dx)", \
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"vmcall", X86_FEATURE_VMCALL, \
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"vmmcall", X86_FEATURE_VMW_VMMCALL)
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/*
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* The high bandwidth out call. The low word of edx is presumed to have the
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* HB and OUT bits set.
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*/
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#define VMWARE_HYPERCALL_HB_OUT \
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ALTERNATIVE_2("movw $" VMWARE_HYPERVISOR_PORT_HB ", %%dx; rep outsb", \
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"vmcall", X86_FEATURE_VMCALL, \
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"vmmcall", X86_FEATURE_VMW_VMMCALL)
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/*
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* The high bandwidth in call. The low word of edx is presumed to have the
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* HB bit set.
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*/
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#define VMWARE_HYPERCALL_HB_IN \
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ALTERNATIVE_2("movw $" VMWARE_HYPERVISOR_PORT_HB ", %%dx; rep insb", \
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"vmcall", X86_FEATURE_VMCALL, \
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"vmmcall", X86_FEATURE_VMW_VMMCALL)
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#endif
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