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

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Add VMware-specific handling for #VC faults caused by VMMCALL
instructions.

Signed-off-by: Doug Covelli <dcovelli@vmware.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
[ jroedel@suse.de: - Adapt to different paravirt interface ]
Co-developed-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-65-joro@8bytes.org
This commit is contained in:
Doug Covelli 2020-09-07 15:16:05 +02:00 committed by Borislav Petkov
parent 99419b251e
commit 1a222de8dc
1 changed files with 45 additions and 5 deletions
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50
arch/x86/kernel/cpu/vmware.c
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@ -33,6 +33,7 @@
#include <asm/timer.h>
#include <asm/apic.h>
#include <asm/vmware.h>
#include <asm/svm.h>
#undef pr_fmt
#define pr_fmt(fmt) "vmware: " fmt
@ -476,10 +477,49 @@ static bool __init vmware_legacy_x2apic_available(void)
(eax & (1 << VMWARE_CMD_LEGACY_X2APIC)) != 0;
}
#ifdef CONFIG_AMD_MEM_ENCRYPT
static void vmware_sev_es_hcall_prepare(struct ghcb *ghcb,
struct pt_regs *regs)
{
/* Copy VMWARE specific Hypercall parameters to the GHCB */
ghcb_set_rip(ghcb, regs->ip);
ghcb_set_rbx(ghcb, regs->bx);
ghcb_set_rcx(ghcb, regs->cx);
ghcb_set_rdx(ghcb, regs->dx);
ghcb_set_rsi(ghcb, regs->si);
ghcb_set_rdi(ghcb, regs->di);
ghcb_set_rbp(ghcb, regs->bp);
}
static bool vmware_sev_es_hcall_finish(struct ghcb *ghcb, struct pt_regs *regs)
{
if (!(ghcb_rbx_is_valid(ghcb) &&
ghcb_rcx_is_valid(ghcb) &&
ghcb_rdx_is_valid(ghcb) &&
ghcb_rsi_is_valid(ghcb) &&
ghcb_rdi_is_valid(ghcb) &&
ghcb_rbp_is_valid(ghcb)))
return false;
regs->bx = ghcb->save.rbx;
regs->cx = ghcb->save.rcx;
regs->dx = ghcb->save.rdx;
regs->si = ghcb->save.rsi;
regs->di = ghcb->save.rdi;
regs->bp = ghcb->save.rbp;
return true;
}
#endif
const __initconst struct hypervisor_x86 x86_hyper_vmware = {
.name = "VMware",
.detect = vmware_platform,
.type = X86_HYPER_VMWARE,
.init.init_platform = vmware_platform_setup,
.init.x2apic_available = vmware_legacy_x2apic_available,
.name = "VMware",
.detect = vmware_platform,
.type = X86_HYPER_VMWARE,
.init.init_platform = vmware_platform_setup,
.init.x2apic_available = vmware_legacy_x2apic_available,
#ifdef CONFIG_AMD_MEM_ENCRYPT
.runtime.sev_es_hcall_prepare = vmware_sev_es_hcall_prepare,
.runtime.sev_es_hcall_finish = vmware_sev_es_hcall_finish,
#endif
};