Commit 4367a758 authored by Sean Christopherson's avatar Sean Christopherson
Browse files

KVM: SVM: Create a stack frame in __svm_sev_es_vcpu_run() 



Now that KVM uses the host save area to context switch RBP, i.e.
preserves RBP for the entirety of __svm_sev_es_vcpu_run(), create a stack
frame using the standared FRAME_{BEGIN,END} macros.

Note, __svm_sev_es_vcpu_run() is subtly not a leaf function as it can call
into ibpb_feature() via UNTRAIN_RET_VM.

Reviewed-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20240223204233.3337324-8-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent adac42bf

arch/x86/kvm/svm/vmenter.S

+4 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
#include <asm/asm.h>

#include <asm/asm-offsets.h>

#include <asm/bitsperlong.h>

#include <asm/frame.h>

#include <asm/kvm_vcpu_regs.h>

#include <asm/nospec-branch.h>

#include "kvm-asm-offsets.h"
@@ -312,6 +313,8 @@ SYM_FUNC_END(__svm_vcpu_run) 
 * @spec_ctrl_intercepted: bool

 */

SYM_FUNC_START(__svm_sev_es_vcpu_run)

	FRAME_BEGIN



	/*

	 * Save non-volatile (callee-saved) registers to the host save area.

	 * Except for RAX and RSP, all GPRs are restored on #VMEXIT, but not
@@ -362,6 +365,7 @@ SYM_FUNC_START(__svm_sev_es_vcpu_run) 
	 */

	UNTRAIN_RET_VM



	FRAME_END

	RET



	RESTORE_GUEST_SPEC_CTRL_BODY