Commit 4754ec7f authored by Tianyu Lan's avatar Tianyu Lan Committed by Wei Liu
Browse files

x86/hyperv: Add hyperv-specific handling for VMMCALL under SEV-ES 



Add Hyperv-specific handling for faults caused by VMMCALL
instructions.

Reviewed-by: default avatarDexuan Cui <decui@microsoft.com>
Reviewed-by: default avatarMichael Kelley <mikelley@microsoft.com>
Signed-off-by: default avatarTianyu Lan <tiala@microsoft.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230818102919.1318039-9-ltykernel@gmail.com
parent 44676bb9

arch/x86/kernel/cpu/mshyperv.c

+21 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <asm/nmi.h>

#include <clocksource/hyperv_timer.h>

#include <asm/numa.h>

#include <asm/svm.h>



/* Is Linux running as the root partition? */

bool hv_root_partition;
@@ -574,6 +575,22 @@ static bool __init ms_hyperv_msi_ext_dest_id(void) 
	return eax & HYPERV_VS_PROPERTIES_EAX_EXTENDED_IOAPIC_RTE;

}



#ifdef CONFIG_AMD_MEM_ENCRYPT

static void hv_sev_es_hcall_prepare(struct ghcb *ghcb, struct pt_regs *regs)

{

	/* RAX and CPL are already in the GHCB */

	ghcb_set_rcx(ghcb, regs->cx);

	ghcb_set_rdx(ghcb, regs->dx);

	ghcb_set_r8(ghcb, regs->r8);

}



static bool hv_sev_es_hcall_finish(struct ghcb *ghcb, struct pt_regs *regs)

{

	/* No checking of the return state needed */

	return true;

}

#endif



const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = {

	.name			= "Microsoft Hyper-V",

	.detect			= ms_hyperv_platform,
@@ -581,4 +598,8 @@ const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = { 
	.init.x2apic_available	= ms_hyperv_x2apic_available,

	.init.msi_ext_dest_id	= ms_hyperv_msi_ext_dest_id,

	.init.init_platform	= ms_hyperv_init_platform,

#ifdef CONFIG_AMD_MEM_ENCRYPT

	.runtime.sev_es_hcall_prepare = hv_sev_es_hcall_prepare,

	.runtime.sev_es_hcall_finish = hv_sev_es_hcall_finish,

#endif

};