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KVM: x86: Add X86EMUL_F_INVLPG and pass it in em_invlpg()

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Add an emulation flag X86EMUL_F_INVLPG, which is used to identify an
instruction that does TLB invalidation without true memory access.

Only invlpg & invlpga implemented in emulator belong to this kind.
invlpga doesn't need additional information for emulation. Just pass
the flag to em_invlpg().

Linear Address Masking (LAM) and Linear Address Space Separation (LASS)
don't apply to addresses that are inputs to TLB invalidation. The flag
will be consumed to support LAM/LASS virtualization.

Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Tested-by: Xuelian Guo <xuelian.guo@intel.com>
Link: https://lore.kernel.org/r/20230913124227.12574-5-binbin.wu@linux.intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Binbin Wu 2023-09-13 20:42:15 +08:00 committed by Sean Christopherson
parent 3963c52df4
commit 538ac9a92d
2 changed files with 4 additions and 1 deletions
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4
arch/x86/kvm/emulate.c
View File

@ -3440,8 +3440,10 @@ static int em_invlpg(struct x86_emulate_ctxt *ctxt)
{
int rc;
ulong linear;
unsigned int max_size;
rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear);
rc = __linearize(ctxt, ctxt->src.addr.mem, &max_size, 1, ctxt->mode,
&linear, X86EMUL_F_INVLPG);
if (rc == X86EMUL_CONTINUE)
ctxt->ops->invlpg(ctxt, linear);
/* Disable writeback. */

1
arch/x86/kvm/kvm_emulate.h
View File

@ -92,6 +92,7 @@ struct x86_instruction_info {
#define X86EMUL_F_WRITE BIT(0)
#define X86EMUL_F_FETCH BIT(1)
#define X86EMUL_F_IMPLICIT BIT(2)
#define X86EMUL_F_INVLPG BIT(3)
struct x86_emulate_ops {
void (*vm_bugged)(struct x86_emulate_ctxt *ctxt);