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KVM: SVM: Add GHCB definitions

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Extend the vmcb_safe_area with SEV-ES fields and add a new
'struct ghcb' which will be used for guest-hypervisor communication.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-3-joro@8bytes.org
This commit is contained in:
Tom Lendacky 2020-09-07 15:15:03 +02:00 committed by Borislav Petkov
parent 6ccbd29ade
commit d07f46f9f5
2 changed files with 51 additions and 2 deletions
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51
arch/x86/include/asm/svm.h
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@ -200,13 +200,60 @@ struct __attribute__ ((__packed__)) vmcb_save_area {
u64 br_to;
u64 last_excp_from;
u64 last_excp_to;
/*
* The following part of the save area is valid only for
* SEV-ES guests when referenced through the GHCB.
*/
u8 reserved_7[104];
u64 reserved_8; /* rax already available at 0x01f8 */
u64 rcx;
u64 rdx;
u64 rbx;
u64 reserved_9; /* rsp already available at 0x01d8 */
u64 rbp;
u64 rsi;
u64 rdi;
u64 r8;
u64 r9;
u64 r10;
u64 r11;
u64 r12;
u64 r13;
u64 r14;
u64 r15;
u8 reserved_10[16];
u64 sw_exit_code;
u64 sw_exit_info_1;
u64 sw_exit_info_2;
u64 sw_scratch;
u8 reserved_11[56];
u64 xcr0;
u8 valid_bitmap[16];
u64 x87_state_gpa;
};
struct ghcb {
struct vmcb_save_area save;
u8 reserved_save[2048 - sizeof(struct vmcb_save_area)];
u8 shared_buffer[2032];
u8 reserved_1[10];
u16 protocol_version; /* negotiated SEV-ES/GHCB protocol version */
u32 ghcb_usage;
} __packed;
#define EXPECTED_VMCB_SAVE_AREA_SIZE 1032
#define EXPECTED_VMCB_CONTROL_AREA_SIZE 256
#define EXPECTED_GHCB_SIZE PAGE_SIZE
static inline void __unused_size_checks(void)
{
BUILD_BUG_ON(sizeof(struct vmcb_save_area) != 0x298);
BUILD_BUG_ON(sizeof(struct vmcb_control_area) != 256);
BUILD_BUG_ON(sizeof(struct vmcb_save_area) != EXPECTED_VMCB_SAVE_AREA_SIZE);
BUILD_BUG_ON(sizeof(struct vmcb_control_area) != EXPECTED_VMCB_CONTROL_AREA_SIZE);
BUILD_BUG_ON(sizeof(struct ghcb) != EXPECTED_GHCB_SIZE);
}
struct __attribute__ ((__packed__)) vmcb {

2
arch/x86/kvm/svm/svm.c
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@ -4164,6 +4164,8 @@ static struct kvm_x86_init_ops svm_init_ops __initdata = {
static int __init svm_init(void)
{
__unused_size_checks();
return kvm_init(&svm_init_ops, sizeof(struct vcpu_svm),
__alignof__(struct vcpu_svm), THIS_MODULE);
}