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

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

Reviewed-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230818102919.1318039-9-ltykernel@gmail.com
This commit is contained in:
Tianyu Lan 2023-08-18 06:29:18 -04:00 committed by Wei Liu
parent 44676bb9d5
commit 4754ec7f20
1 changed files with 21 additions and 0 deletions
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21
arch/x86/kernel/cpu/mshyperv.c
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@ -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
};